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Experimental and kinetic study on pyrolysis and combustion characteristics of sugar tar waste liquid(STWL):Effects of water contents and O2concentrations 认领 引用
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作者 Junwei Luo Long Yang +5 位作者 Zewu Zhang Feixiang Li Xiaojian Zha Qiaoyun Jiang Cong Luo Liqi Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第2期59-70,共12页
In this study,the pyrolysis and combustion characteristics of sugar tar waste liquid(STWL)affected by different water contents and oxygen concentrations are studied by using a Thermogravimetric analysis,and the kineti... In this study,the pyrolysis and combustion characteristics of sugar tar waste liquid(STWL)affected by different water contents and oxygen concentrations are studied by using a Thermogravimetric analysis,and the kinetic parameters of the pyrolysis and combustion are obtained by the Coats-Redfern integral method.The results show that both the pyrolysis process and the combustion process of the STWLs are divided into two stages under the different water contents and oxygen concentrations.The low and high temperature ranges for pyrolysis and combustion process are below 420℃ and 420-500℃ and below 400℃ and 400500℃,respectively.As the water contents increase,the pyrolysis initial temperature Ti,p gradually decreases and the comprehensive pyrolysis characteristic index D also decreases for the pyrolysis process.The Ti,p increases from 224℃to 350℃,and the index D decreases from 3.30×10-4to 0.811×10-4% 3·min-2·℃-3.The combustion ignition temperature Ti,c increases and the comprehensive combustion characteristic index S decreases.When the oxygen concentration increases,the ignition temperature and the burnout temperature remain almost constant,with variations of 3.6%and 2.0%,respectively.Besides,the pyrolysis and combustion process of the STWL obeys the stochastic nucleation and subsequent growth model,i.e.,[-ln(1-α)]4.These results are expected to provide some valuable guidance for organic waste liquid incineration treatment. 展开更多
关键词 Organic waste liquid Incineration treatment Combustion characteristics Water and O2 content Kinetic analysis
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近五年固体酸催化剂强化醇胺溶液解吸CO2技术研究进展 认领 引用
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作者 谭湛 张晓文 +5 位作者 何慧玲 张治阳 刘宇祥 毛嘉屿 游奎一 罗和安 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2026年第5期29-56,共28页
近年来,随着全球范围对碳减排需求的日益迫切,有机胺溶剂化学吸收法作为燃烧后CO2捕集的主流技术,因其吸收效率高、工艺成熟而备受关注。然而,传统有机胺吸收法在溶剂再生阶段(CO2解吸)存在能耗高、溶剂易降解和腐蚀设备等问题,... 近年来,随着全球范围对碳减排需求的日益迫切,有机胺溶剂化学吸收法作为燃烧后CO2捕集的主流技术,因其吸收效率高、工艺成熟而备受关注。然而,传统有机胺吸收法在溶剂再生阶段(CO2解吸)存在能耗高、溶剂易降解和腐蚀设备等问题,制约了其规模化应用。为解决上述难题,催化CO2解吸技术应运而生,通过在富液再生过程中引入固体酸催化剂,有效降低了CO2解吸反应能垒,显著提升了传质与反应动力学性能,从而实现在较低温度下高效再生,大幅削减再生能耗及溶剂损耗。本综述围绕近五年催化解吸技术中关键催化剂材料的研究展开评述,重点揭示了不同类型固体酸催化剂的构效关系、催化活性中心(如Lewis酸、Brønsted酸及碱性位点)在催化解吸反应中的协同机制,以及其对解吸路径的影响规律,进而剖析当前该技术面临的关键科学与技术挑战,并对其在低成本碳捕集领域的工业应用前景作出展望。 展开更多
关键词 CO2捕集 燃烧后捕集 催化再生技术 固体酸催化剂 降低能耗
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Temperature dependence on reaction of CaCO_3 and SO_2 in O_2/CO_2 coal combustion 认领 引用 被引量：2
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作者 王宏 徐辉碧 +1 位作者 郑楚光 邱建荣 《Journal of Central South University》 SCIE EI CAS 2009年第5期845-850,共6页
The temperature dependence on the reaction of desulfurization reagent CaCO3 and SO2 in O2/CO2 coal combustion was investigated by thcrmogravimetric analysis, X-ray diffraction measurement and pore structure analysis. ... The temperature dependence on the reaction of desulfurization reagent CaCO3 and SO2 in O2/CO2 coal combustion was investigated by thcrmogravimetric analysis, X-ray diffraction measurement and pore structure analysis. The results show that the conversion of the reaction of CaCO3 and SO2 in air is higher at 500-1 100 ℃ and lower at 1 200 ℃ compared with that in O2/CO2 atmosphere. The conversion can be increased by increasing the concentration of SO2, which causes the inhibition of CaSO4 decomposition and shifting of the reaction equilibrium toward the products. XRD analysis of the product shows that the reaction mechanism of CaCO3 and SO2 differs with temperature in O2/CO2 atmosphere, i.e. CaCO3 directly reacts with SO2 at 500 ℃ and CaO from CaCO3 decomposition reacts with SO2 at 1 000 ℃. The pore analysis of the products indicates that the maximum specific surface area of the products accounts for the highest conversion at 1 100 ℃ in O2/CO2 atmosphere. The results reveal that the effect of the atmosphere on the conversion is temperature dependence. 展开更多
关键词 CaCO3 SO2 O2/CO2 coal combustion temperature dependence
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Combustion behavior and NO emission characteristic of biomass in O_2/CO_2 atmosphere 认领 引用
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作者 段锋 孙肖茹 +2 位作者 张友松 胡爱凤 钱建嵩 《Journal of Southeast University(English Edition)》 EI CAS 2015年第2期200-203,共4页
The thermogravimetric analyzer and horizontal tube furnace are used to study the effects of operation parameters such as temperature, fuel type, and oxygen concentration on the combustion and NO emission characteristi... The thermogravimetric analyzer and horizontal tube furnace are used to study the effects of operation parameters such as temperature, fuel type, and oxygen concentration on the combustion and NO emission characteristics of the rice husk, rice straw, and peanut shell in the O2/CO2 atmosphere. The results show that the combustion performances of volatile matter and fixed carbon of the three biomasses increase with the increase in the 02 content. The mean NO emission increases sharply when the reaction temperature increases from 700 to 800℃. However, it increases slightly when the temperature exceeds 800 ℃. Meanwhile, the mean NO emission and nitrogen conversion decrease with the increase in the nitrogen content in biomass. The mean NO emission changes little with different oxygen concentrations, and the NO emissions of the three biomasses are all lower than the requirement for the minimum NO emission. Increasing the oxygen concentration favors the biomass combustion in the O2/CO2 atmosphere, and oxygen concentration has little effect on the NO emission. 展开更多
关键词 biomass combustion thermogravimetric NOemission O2/CO2
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蒸汽稀释对加压NH3/O2/H2O火焰的作用机理 认领 引用
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作者 韩博 张屿 +3 位作者 赵义军 张文达 张林瑶 孙绍增 《洁净煤技术》 CAS CSCD 北大核心 2026年第7期196-208,共13页
氨富氧燃烧作为潜在的零碳高效燃烧发电技术,其发展受到火焰温度和NOx排放较高的限制。水蒸气稀释可以有效抑制氨富氧火焰温度和NOx排放,需要探究水蒸气稀释作用机理,平衡调控氨富氧燃烧效率和火焰特性。在近真实燃机进气温度和... 氨富氧燃烧作为潜在的零碳高效燃烧发电技术,其发展受到火焰温度和NOx排放较高的限制。水蒸气稀释可以有效抑制氨富氧火焰温度和NOx排放,需要探究水蒸气稀释作用机理,平衡调控氨富氧燃烧效率和火焰特性。在近真实燃机进气温度和燃烧室压力条件下对NH3/O2/H2O火焰进行动力学模拟,探究了不同当量比和压力条件下水稀释对NH3/O2/H2O火焰的影响,解耦了蒸汽稀释在氨富氧燃烧中的物理和化学作用。结果表明:NH3/O2/H2O燃烧中NH3的转化率接近1,NO占NOx排放的99.99%以上。增大压强与蒸汽稀释均降低了层流火焰速度,蒸汽稀释和加压分别对火焰温度产生抑制和促进作用。在高压条件(1.0 MPa)下,稀释比0.25可使层流火焰速度和火焰温度分别降低102.89 cm/s和376.23 K。贫燃条件下NO排放随着压力增加先减小后增大,富燃条件下加压对NO排放产生单调抑制作用,1.0 MPa、稀释比0.25的条件可使NO排放的体积分数降低至1.647×10-4(15%O2基准)。相较于化学作用,蒸汽稀释的物理作用对氨富氧燃烧层流火焰速度、火焰温度和NOx排放影响更为显著。物理作用中稀释效应影响最大,该效应显著抑制了层流火焰速度和火焰温度,促进了NOx排放;热力学效应、输运效应、辐射效应降低了火焰速度与温度,辐射效应的影响最小。当压强增大时,蒸汽稀释对氨火焰特性的物理作用普遍增强,化学作用有所减弱。在蒸汽稀释的化学作用中,加压条件下直接反应效应比三体反应效应更加显著,二者都会抑制火焰速度并降低火焰温度,直接反应效应可以减少NO排放而三体反应效应则相反。 展开更多
关键词 氨 加压O2/H2O燃烧 层流火焰速度 火焰温度 NO排放
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Fe/beta催化剂硅铝比对氨内燃机NOx和N2O协同转化的影响 认领 引用
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作者 牟嘉琳 王瑞芳 +3 位作者 孙睿 梁亚飞 张艳华 刘志敏 《工业催化》 CAS 2026年第7期39-45,共7页
氨内燃机(ICEs)因零碳排放潜力成为交通运输领域的重要研究方向之一,然而其排放尾气中存在大量氮氧化物(NOx)、未燃氨(NH3)以及一定浓度的氧化亚氮(N2O),需要提升催化剂性能来协同转化NOx和N2O。通过等体积浸渍法制备了... 氨内燃机(ICEs)因零碳排放潜力成为交通运输领域的重要研究方向之一,然而其排放尾气中存在大量氮氧化物(NOx)、未燃氨(NH3)以及一定浓度的氧化亚氮(N2O),需要提升催化剂性能来协同转化NOx和N2O。通过等体积浸渍法制备了一系列Fe基分子筛催化剂,考察不同硅铝比(SAR)beta分子筛负载Fe基催化剂同时催化转化氨内燃机后处理尾气中NOx和N2O的性能。利用XRD、N2吸附-脱附、SEM、UV-vis DRS和NH3-TPD等方法对催化剂的织构性能、形貌、Fe物种以及表面酸性进行表征。结果表明,SAR=24时,beta分子筛粒径最小且部分堆积团聚形成介孔,更有利于反应物的吸附;同时,Fe/beta-24催化剂含有更多的Brønsted酸位点,能进一步促进对NOx和N2O的吸附和活化;此外,Fe/beta-24催化剂中的Fe物种主要以孤立的Fe离子以及FeOx团簇形式存在,是NOx和N2O转化的主要活性物种。因此,在严苛模拟氨内燃机尾气条件下,Fe/beta-24催化剂展现出最优的协同转化NOx和N2O的能力。本工作为氨内燃机后处理系统协同处理NOx和N2O提供了新的研究策略。 展开更多
关键词 催化剂工程 氨内燃机 Fe基催化剂 硅铝比 协同催化NOx和N2O
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城镇污水处理厂N2O排放技术分析 认领 引用
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作者 张玉琼 《中国高新科技》 2026年第4期95-97,共3页
为提高城镇污水处理厂的N2O排放质量,通过梳理污水处理厂N2O的产生机制,分析N2O减排技术原理,对城镇污水处理厂生化技术、氨氧化细菌同步亚硝化与反硝化技术、生物排放技术进行了阐述。运用以上技术,能够优化城镇污水处理厂N_(... 为提高城镇污水处理厂的N2O排放质量,通过梳理污水处理厂N2O的产生机制,分析N2O减排技术原理,对城镇污水处理厂生化技术、氨氧化细菌同步亚硝化与反硝化技术、生物排放技术进行了阐述。运用以上技术,能够优化城镇污水处理厂N2O排放水平。 展开更多
关键词 城镇污水处理厂 N2O 排放技术
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Effects of Ce on catalytic combustion of methane over Pd-Pt/Al_2O_3 catalyst 认领 引用 被引量：18
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作者 Xing Fan Fan Wang +1 位作者 Tianle Zhu Hong He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第3期507-511,共5页
Activity and stability of 1%Pd-0.2%Pt/Al2O3 and 1%Pd-0.2%Pt/0.6%Ce/Al2O3 catalysts prepared by impregnation method for catalytic combustion of methane in air were investigated. The catalysts before and after reaction ... Activity and stability of 1%Pd-0.2%Pt/Al2O3 and 1%Pd-0.2%Pt/0.6%Ce/Al2O3 catalysts prepared by impregnation method for catalytic combustion of methane in air were investigated. The catalysts before and after reaction were characterized by BET, CO chemisorption, XRD and XPS techniques. Results showed that the presence of Ce significantly increased the activity and thermal stability of the Pd-Pt/Al2O3 catalyst towards methane combustion, which could be attributed to more highly-dispersed active PdO particles over the Pd-Pt/Ce/Al2O3 catalyst surface as well as the retarded sintering of PdO and the maintained oxidized state of surface Pd during the combustion process in the presence of Ce. 展开更多
关键词 catalytic combustion methane Pd-Pt/Ce/Al2O3 catalyst stability metal dispersion
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Preparation of Non-Grinding Long Afterglow SrAl_2O_4:Eu2+, Dy3+ Material by Microwave Combustion Method 认领 引用 被引量：19
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作者 杜海燕 李庚申 孙家跃 《Journal of Rare Earths》 SCIE EI CAS 2007年第1期19-22,共4页
The non-grinding long afterglow material SrAl2O4：Eu^2＋ , Dy^3＋ was prepared by combustion method in home mierowave oven direetly, after dispersant, frother, eomburent, and mineralizer were added into the reacting s... The non-grinding long afterglow material SrAl2O4：Eu^2＋ , Dy^3＋ was prepared by combustion method in home mierowave oven direetly, after dispersant, frother, eomburent, and mineralizer were added into the reacting system. XRD analysis showed that the powders were nearly pure SrAl2O4 phase with few other phases, and the size of the grain was 41.1 nm. Fluoreseenee speetrum results indieated that there were 2 exeitation peaks loeated at 345 and 400 nm, and the emission peak loeated at 516 nm, afterglow lasted up to 30 min or more. The mierowave eombustion method has advantages of less time, low temperature and no grinding process, and the material made by the method has good luminescent property. 展开更多
关键词 microwave combustion non-grinding long afterglow SrAl2O4 ： Eu^2 ＋ , Dy^3 ＋ rare earths
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A modified solution combustion method to superfine Gd_2O_3:Eu3+ phosphor:preparation,phase transformation and optical properties 认领 引用 被引量：9
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作者 叶信宇 高文贵 +2 位作者 夏李斌 聂华平 庄卫东 《Journal of Rare Earths》 SCIE EI CAS 2010年第3期345-350,共6页
Cubic and monoclinic Gd2O3:Eu3+ phosphors in the range of nano-scale and submicron-scale were prepared by a modified solution combustion method.Coexistence of cubic and monoclinic phases was found in the highest lumin... Cubic and monoclinic Gd2O3:Eu3+ phosphors in the range of nano-scale and submicron-scale were prepared by a modified solution combustion method.Coexistence of cubic and monoclinic phases was found in the highest luminescent sample synthesized at 600 oC.In relation to commercial sample,the relative luminescence intensity was 49.8%.The shape of emission spectrum of the sample thus changed and the charge-transfer-state band of excitation spectrum slightly shift toward higher energies.With increasing the anneal... 展开更多
关键词 Gd2O3:Eu3+ phase transformation solution combustion method optical property rare earths
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A novel PdNi/Al_2O_3 catalyst prepared by galvanic deposition for low temperature methane combustion 认领 引用 被引量：9
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作者 Xiqiang Pan Yibo Zhang +1 位作者 Zhenzhen Miao Xiangguang Yang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第4期610-616,共7页
Galvanic deposition method was used to prepare the Pd/Ni-Al2O3-GD catalyst for the combustion of methane under lean conditions. The new catalyst and compared catalysts （Pd/Al2O3-IW, Pd-Ni/Al2O3-IW, Pd/Ni-Al2O3-IW） p... Galvanic deposition method was used to prepare the Pd/Ni-Al2O3-GD catalyst for the combustion of methane under lean conditions. The new catalyst and compared catalysts （Pd/Al2O3-IW, Pd-Ni/Al2O3-IW, Pd/Ni-Al2O3-IW） prepared by incipient wetness impregnation were characterized by N2-physisorption, XRD and TEM to clarify particle size and size distribution of palladium species. Combined O2-TPD and XPS results with the catalytic data, it shows that the surface palladium species with low valence exhibits better combustion performance due to their stronger interaction with support. The results indicate that the galvanic deposition method is an effective route to prepare efficient catalyst for methane combustion, and it also provides useful information for improving the present commercial catalyst. 展开更多
关键词 methane catalytic combustion palladium Pd/Al2O3 galvanic replace reaction
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Preparation and photoluminescence of Tb3+ doped SrAl_2O_4 phosphor by composite combustion method 认领 引用 被引量：7
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作者 张艳芳 李岚 +2 位作者 张晓松 王达健 张飒飒 《Journal of Rare Earths》 SCIE EI CAS 2008年第5期656-659,共4页
High-efficient Tb^3＋ activated SrAl2O4 phosphor was synthesized by a combined combustion-solid-state reaction method. The precursor of SrAl2O4：Th^3＋ phosphor was prepared via a combustion process, and then the as-p... High-efficient Tb^3＋ activated SrAl2O4 phosphor was synthesized by a combined combustion-solid-state reaction method. The precursor of SrAl2O4：Th^3＋ phosphor was prepared via a combustion process, and then the as-prepared powder was heated in a reductive ambient of activated carbon at 1250 ℃ for 1 h. The results of X-ray diffraction, scanning electron microscopy, and photoluminescence spectra revealed the influence of the dosage of urea and heated process on the crystallinity, morphology, and photoluminescence of the phosphor. Comparing with traditional solid-sate reaction, the crystallinity and emission intensity of the SrAl2O4：Tb^3＋ phosphor were improved by this two-step process. 展开更多
关键词 combustion synthesis SrAl2O4： Tb^3＋ crystallinity rare earths
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Sulfur evolution in chemical looping combustion of coal with MnFe_2O_4 oxygen carrier 认领 引用 被引量：6
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作者 Baowen Wang Chuchang Gao +2 位作者 Weishu Wang Haibo Zhao Chuguang Zheng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第5期1062-1070,共9页
Chemical looping combustion （CLC） of coal has gained increasing attention as a novel combustion technology for its advantages in CO2 capture. Sulfur evolution from coal causes great harm from either the CLC operatio... Chemical looping combustion （CLC） of coal has gained increasing attention as a novel combustion technology for its advantages in CO2 capture. Sulfur evolution from coal causes great harm from either the CLC operational or environmental perspective. In this research, a combined MnFe2O4 oxygen carrier （OC） was synthesized and its reaction with a typical Chinese high sulfur coal, Liuzhi （LZ） bituminous coal, was performed in a thermogravimetric analyzer （TGA）-Fourier transform infrared （FT-IR） spectrometer. Evolution of sulfur species during reaction of LZ coal with MnFeaO40C was systematically investigated through experimental means combined with thermodynamic simulation. TGA-FTIR analysis of the LZ reaction with MnFe2O4 indicated MnFe2O4 exhibited the desired superior reactivity compared to the single reference oxides Mn304 or Fe203, and SO2 produced was mainly related to oxidization of H2S by MnFe2O4. Experimental analysis of the LZ coal reaction with MnFe2O4, including X-ray diffraction and X-ray photoelectron spectroscopy analysis, verified that the main reduced counterparts of MnFe2O4 were Fe304 and MnO, in good agreement with the related thermodynamic simulation. The obtained MnO was beneficial to stabilize the reduced MnFe2O4 and avoid serious sintering, although the oxygen in MnO was not fully utilized. Meanwhile, most sulfur present in LZ coal was converted to solid MnS during LZ reaction with MnFe2O4, which was further oxidized to MnSO4. Finally, the formation of both MnS and such manganese silicates as Mn2SiO4 and MnSiO3 should be addressed to ensure the full regeneration of the reduced MnFe2O4. 展开更多
关键词 CO2 capture chemical looping combustion MnFe2O4
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Stable CuO/La2Sn2O7 catalysts for soot combustion:Study on the monolayer dispersion behavior of CuO over a La2Sn2O7 pyrochlore support 认领 引用 被引量：5
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作者 Xiaohui Feng Rui Liu +6 位作者 Xianglan Xu Yunyan Tong Shijing Zhang Jiacheng He Junwei Xu Xiuzhong Fang Xiang Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第3期396-408,共13页
To understand the dispersion behavior of metal oxides on composite oxide supports and with the expectation of developing more feasible catalysts for soot oxidation,CuO/La2Sn2O7samples containing varied CuO lo... To understand the dispersion behavior of metal oxides on composite oxide supports and with the expectation of developing more feasible catalysts for soot oxidation,CuO/La2Sn2O7samples containing varied CuO loadings were fabricated and characterized by different techniques and density functional theory calculations.In these catalysts,a spontaneous dispersion of CuO on the La2Sn2O7pyrochlore support formed,having a monolayer dispersion capacity of 1.90 mmol CuO/100 m2 La2Sn2O7surface.When loaded below this capacity,CuO exists in a sub-monolayer or monolayer state.X-ray photoelectron spectroscopy(XPS),Raman spectroscopy,and Bader charge and density of states analyses indicate that there are strong interactions between the sub-monolayer/monolayer CuO and the La2Sn2O7support,mainly through the donation of electrons from Cu to Sn at the B-sites of the structure.In contrast,Cu has negligible interactions with La at the A-sites.This suggests that,in composite oxide supports containing multiple metals,the supported metal oxide interacts preferentially with one kind of metal cation in the support.The Raman,in situ diffuse reflectance infrared Fourier transform spectroscopy,and XPS results confirmed the formation of both O2-and O22-as the active sites on the surfaces of the CuO/La2Sn2O7catalysts,and the concentration of these active species determines the soot combustion activity.The number of active oxygen anions increased with increase in CuO loading until the monolayer dispersion capacity was reached.Above the monolayer dispersion capacity,microsized CuO crystallites formed,and these had a negative effect on the generation of active surface oxygen sites.In summary,a highly active catalyst can be prepared by covering the surface of the La2Sn2O7support with a CuO monolayer. 展开更多
关键词 CuO/La2Sn2O7catalyst Soot combustion DFT calculations Preferential interaction Monolayer dispersion on pyrochlore support Active O2-and O22-sites
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Structure and catalytic property of CeO_2-ZrO_2-Fe_2O_3 mixed oxide catalysts for diesel soot combustion: Effect of preparation method 认领 引用 被引量：8
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作者 顾振华 桑秀丽 +1 位作者 王华 李孔斋 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第9期817-823,共7页
A series of Ceo.sFeo.30Zr0.20O2 catalysts were prepared by different methods （co-precipitations method, citric acid sol-gel method, impregnation method, physical mixed method, and hydrotherrnal method） and character... A series of Ceo.sFeo.30Zr0.20O2 catalysts were prepared by different methods （co-precipitations method, citric acid sol-gel method, impregnation method, physical mixed method, and hydrotherrnal method） and characterized by X-ray diffraction （XRD）, Raman spectroscopy, Brunauer-Emmett-Teller （BET） and H2-TPR measurements. Potential of the catalysts in the soot oxidation was evaluated in a temperature-programmed oxidation （TPO） apparatus. The results showed that all the Fe3＋ and Zr4＋ were incor- porated into ceria lattice to form a pure Ce-Fe-Zr-O solid solution for the co-precipitation sample, but two kinds of Fe phases ex- isted in the Ce-Fe-Zr-O catalysts prepared by other methods： Fe3＋ incorporated into CeO2 lattice and dispersed Fe2O3 clusters. The free Fe2O3 clusters could improve the activity of catalysts for soot oxidation comparing with the pure Ce-Fe-Zr-O solid solution owing to the synergetic effect between free Fe2O3 and surface oxygen vacancies. In addition, the activity of catalysts strongly relied on the surface reducibility of free Fe2O3 particles. Holding both abundant free Fe2O3 particles and high oxygen vacancy concentration, the hydrothermal Ce0.5Fe0.3Zr0.202 catalyst presented the lowest Ti （251℃, ignition temperature of soot oxidation） and Tm （310 ℃, maximum oxidation rate temperature） for soot combustion （with tight-contact between soot and catalysts） among the five samples. Even after aging at 800 ℃ for 10 h, the Ti and Tm were still relatively low, at 273 and 361 ℃, respectively, indicating high catalytic stability. 展开更多
关键词 Ce0.5Fe0.30Zr0.20O2 mixed oxides soot combustion solid solution interaction hydrothermal method rare earths
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Combustion synthesis and characterizations of Sm2O3 doped zirconolite-rich waste forms with CuO as oxidant 认领 引用 被引量：3
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作者 Kuibao Zhang Dan Yin +3 位作者 Zongsheng He Jiali Xue Wenwen Zhao Haibin Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第12期1359-1365,共7页
Zirconolite is one of the most important matrix materials for nuclear waste immobilization.In this study,Sm was employed as the surrogate of trivalent actinides.Sm-doped zirconolite-rich waste forms were readily prepa... Zirconolite is one of the most important matrix materials for nuclear waste immobilization.In this study,Sm was employed as the surrogate of trivalent actinides.Sm-doped zirconolite-rich waste forms were readily prepared by combustion synthesis(CS)using CuO as the oxidant.Two different schemes with or without Al2O3 as the charge compensator were carried out simultaneously.The results demonstrate that Al2O3 addition results in complex phase composition.On the other hand,the samples without Al2O3 addition show desirable products of zirconolite and pyrochlore.The EDX analysis shows that Sm is concurrently incorporated into the Ca and Zr sites of zirconolite,which transforms to pyrochlore structure with high Sm2O3 contents.The aqueous durability of representative Sm-doped sample(Sm-0.6)was investigated.The 42 days normalized leaching rate of Sm is as low as 6.41×10-7 g/(m2 d),which exhibits high durability of Sm-doped sample. 展开更多
关键词 Combustion synthesis Sm2O3 Zirconolite Pyrochlore Aqueous durability Rare earths
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Influence of dispersant on Y_2O_3:Eu3+ powders synthesized by combustion method 认领 引用 被引量：4
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作者 王超男 赵江波 +2 位作者 李勇 张慰萍 尹民 《Journal of Rare Earths》 SCIE EI CAS 2009年第6期879-885,共7页
Y2O3:Eu3+ powders were synthesized by combustion method and the influence of dispersant was investigated.XRD analysis indicated that the particle size increased with a small amount of dispersant firstly and then decre... Y2O3:Eu3+ powders were synthesized by combustion method and the influence of dispersant was investigated.XRD analysis indicated that the particle size increased with a small amount of dispersant firstly and then decreased with a further increase of dispersant.The morphologies of the powders were studied by scanning electron microscopy(SEM) and high-resolution transmission electron microscopy(HRTEM).SEM images revealed that an appropriate amount of dispersant could reduce the agglomeration significantly.Due ... 展开更多
关键词 Y2O3 combustion PEG2000 rare earths
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Combustion synthesis and upconversion luminescence of CaSc_2O_4:Yb3+,Er3+ nanopowders 认领 引用 被引量：4
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作者 彭文芳 邹少瑜 +3 位作者 刘关喜 肖全兰 孟建新 张蕤 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第4期330-334,共5页
Novel up-conversion （UC） luminescent nano-powders, CaSc2O4：Yb3＋：Er3＋ were prepared with a combustion method at an ignition temperature as low as 200 oC. The CaSc2O4：Yb3＋,Er3＋ nano-powder had an orthorhombic C... Novel up-conversion （UC） luminescent nano-powders, CaSc2O4：Yb3＋：Er3＋ were prepared with a combustion method at an ignition temperature as low as 200 oC. The CaSc2O4：Yb3＋,Er3＋ nano-powder had an orthorhombic CaFe2O4-type structure, and showed sphere-like morphology with an average diameter of about 30 nm. It gave strong green （525, 552 nm） and red （652–674 nm） up-conversion luminescence due to the 2H11/2→4I15/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3＋ under a 980 nm semiconductor laser excitation at room temperature. The optimized doping concentrations for Yb3＋ and Er3＋ were 6.0 mol.% and 1.0 mol.%, respectively. Effects of ignition temperature and glycine-to-metal nitrate molar ratio on up-conversion emission intensity were also investigated. The log-log plots of luminescence intensity and pump power revealed that the 652–674 nm red emissions and 552 nm green emissions belonged to a two-photon process, while the 525 nm green emissions belonged to a three-photon process. The possible UC mechanisms were briefly discussed. 展开更多
关键词 CaSc2O4：Yb3＋ Er3＋ up-conversion combustion method nano-powders luminescence rare earths
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Effect of Fe_2O_3 Loading Amount on Catalytic Properties of Monolithic Fe_2O_3/Ce0.67Zr0.33O_2-Al_2O_3 Catalyst for Methane Combustion 认领 引用 被引量：4
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作者 刘志敏 陈耀强 +3 位作者 钟俊波 王健礼 闫生辉 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第5期585-589,共5页
Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal lo... Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal loading amount of Fe2O3 on Ce0.67Zr0.33 O2-Al2O3 in our experimental condition for catalytic combustion of methane was 8% （ mass fraction）. The prepared catalysts were characterized by BET, TPR, XRD analyses, and their catalytic activity was investigated after being calcined at 873 K and after being aged in water gas at 1273 K. When the loading amount of Fe203 was 8% （ mass fraction）, the catalyst held the highest activity, and the best temperature speciality and thermal stability. The complete-conversion temperature of methane for fresh and aged sample was 788 and 838 K, respectively. The range between the light-off temperature and the complete-conversion temperature was only 15 K. The characterization results of XRD indicated that Fe2O3 was well dispersed on the Ce0.67Zr0.33O2-Al2O3 matrix. The results of BET and TPR were in good harmony with the catalytic activity results. 展开更多
关键词 Ce0.67Zr0.33O2 -Al2O3, Fe2O3-based monolithic catalyst catalytic methane combustion catalytic properties
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Catalytic combustion study of soot on Ce0.7Zr0.3O_2 solid solution 认领 引用 被引量：4
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作者 方萍 鲁继青 +1 位作者 肖小燕 罗孟飞 《Journal of Rare Earths》 SCIE EI CAS 2008年第2期250-253,共4页
The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD result... The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD results indicated that Zr^4＋ had replaced part of Ce^4＋ to form a fluorite-like solid solution, which was favorable to obtain ultrafine nanoparticles. The ratio of main HE consumption for Ce0.7Zr0.3O2：CeO2 was 4.4：1.0, implying that the solid solution could improve the reducibility compared to the single CeO2. The Ce0.7Zr0.3O2 solid solution catalyst showed a sharp combustion peak at 397 ℃, which was 200 ℃ lower than that of the single soot. The good catalytic activity of the Ce0.7Zr0.3O2 was attributed to the formation of nano-CeO2-based solid solution, which enhanced the reducibility and then improved the combustion activity. As Ce0.7Zr0.3O2 could be easily reduced to Ce0.7Zr0.3O2-x meanwhile, after oxygenation, the Ce0.7Zr0.3O2.x was recovered to Ce0.7Zr0.3O2 completely. A catalytic combustion reaction mechanism was proposed： the Ce0.7Zr0.3O2 was reduced to Ce0.7Zr0.3O2-x by the reaction with carbon and then it was recovered to Ce0.7Zr0.3O2-x by the interaction with O2. 展开更多
关键词 Ce0.7Zr0.3O2 reoxidizing-reducing soot combustion catalytic activity rare earths
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