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纳米Bi2O3和Sb2O3掺杂对Y-Ba-Cu-O超导块材生长和性能的影响 认领 引用
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作者 李国政 王妙 《物理学报》 SCIE EI CAS CSCD 北大核心 2026年第16期266-272,共7页
RE2Ba4CuMOy(REM-2411,RE为稀土元素,M=Nb,W,Sb,Bi等)具有化学稳定性好且能在RE-Ba-Cu-O(REBCO)超导基体内自发成纳米尺寸的优点,近些年得到了广泛的研究.利用金属氧化物掺杂在REBCO中原位生成REM-2411是一种更简单、高效的方... RE2Ba4CuMOy(REM-2411,RE为稀土元素,M=Nb,W,Sb,Bi等)具有化学稳定性好且能在RE-Ba-Cu-O(REBCO)超导基体内自发成纳米尺寸的优点,近些年得到了广泛的研究.利用金属氧化物掺杂在REBCO中原位生成REM-2411是一种更简单、高效的方法.本文采用011型熔渗生长工艺研究纳米BiO3和SbO3掺杂对Y-Ba-Cu-O(YBCO)超导块材生长和性能的影响.结果表明,质量分数0.5%的纳米BiO3掺杂不会影响YBCO块材的正常生长,且样品的悬浮力和Jc性能均有所提升.但质量分数0.5%纳米SbO3掺杂的样品的生长区明显缩小,且整个生长区出现周期性宏观偏析带现象,同时样品的悬浮力和J性能显著降低.高掺杂量(质量分数5%)样品的X射线衍射分析结果证实了纳米BiO3/SbO3掺杂的样品中出现了YBi-2411/YSb2411相.扫描电子显微镜结果表明,质量分数5%纳米BiO3掺杂的样品中观察到大量的YBi-2411纳米粒子,其分布密度极高,表明在YBCO体系中原位生成YBi-2411纳米粒子非常容易.综合掺杂物对样品生长和性能的影响,纳米BiO3可视为针对YBCO超导块材的一种安全且优异的掺杂物,也有潜力成为提升所有REBCO系列超导体性能的通用掺杂物.本文结果对进一步提高YBCO超导块材的性能有重要意义。 展开更多
关键词 Y-Ba-Cu-O 熔渗生长 纳米BiO3掺杂 纳米Sb2O掺杂 超导性能
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CaO含量对SiO2-Al2O3-CaO系轻质陶粒性能的影响及机理分析 认领 引用
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作者 张祎欢 范海宏 +2 位作者 李俊杰 王玉浓 吴瑞 《新型建筑材料》 2026年第8期88-93,99,共6页
以煤矸石和垃圾焚烧飞灰等工业固废为主要原料,研究CaO含量(0.53%~33.61%)对SiO2-Al2O3-CaO系轻质陶粒物理性能及矿物组成的影响规律。结果表明,随着CaO含量增加,陶粒表观密度与单颗粒强度呈现减-增-减的非单调变化趋势,膨胀率与吸水率... 以煤矸石和垃圾焚烧飞灰等工业固废为主要原料,研究CaO含量(0.53%~33.61%)对SiO2-Al2O3-CaO系轻质陶粒物理性能及矿物组成的影响规律。结果表明,随着CaO含量增加,陶粒表观密度与单颗粒强度呈现减-增-减的非单调变化趋势,膨胀率与吸水率则呈相反规律。当CaO含量为11.56%、烧结温度1180℃时,可获得综合性能最优的陶粒:单颗粒强度1.75 MPa,表观密度471.43 kg/m3,吸水率3.85%。XRD与SEM-EDS分析表明,钙长石是陶粒膨胀过程的主导晶相,其含量随CaO含量的增加而升高。机理研究表明,适量CaO既可降低熔体黏度促进气体包裹,又能与硅铝组分反应形成钙长石骨架,二者协同作用实现陶粒的轻质化。 展开更多
关键词 SiO2-Al2O3-CaO系 陶粒 工业固废 钙长石 CaO含量 烧结机理
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C/C-SiC复合材料表面Y_2O_3-ZrO_2-Al_2O_3涂层的涂刷法制备及其抗高温氧化性能 认领 引用 被引量：4
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作者 焦更生 卢国锋 李贺军 《材料保护》 CAS CSCD 北大核心 2014年第7期9-11,6,共3页
为了提高C/C复合材料的抗高温氧化性能,用包埋法在C/C复合材料表面制备SiC内涂层,再在其上刷涂制备Y2O3-ZrO2-Al2O3多组分涂层,对制备涂层的各种影响因素进行分析,确定最佳制备工艺,并考察了该涂层的组织结构和抗高温氧化性能。结果表明... 为了提高C/C复合材料的抗高温氧化性能,用包埋法在C/C复合材料表面制备SiC内涂层,再在其上刷涂制备Y2O3-ZrO2-Al2O3多组分涂层,对制备涂层的各种影响因素进行分析,确定最佳制备工艺,并考察了该涂层的组织结构和抗高温氧化性能。结果表明:最佳制备条件为以SiC为内涂层、10%聚乙烯醇(PVA)为分散剂,以Y2O3,ZrO2,Al2O3,Si及C为原料,室温涂覆,升温到1 873 K保温30 min,反复进行5次;该涂层在1 873 K下氧化19 h,失重率仅1.76%,有良好的短期抗高温氧化性能,氧化29 h时失重率为6.23%,涂层可能已破坏失效;涂层的失效是由于其表面形成的孔洞和裂纹不能愈合而导致的。 展开更多
关键词 Y2O3-ZrO2-Al2O3涂层 涂刷法 C C复合材料 SiC 抗高温氧化性能
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反应条件对CuO/Y_2O_3-ZrO_2-Al_2O_3催化甲烷燃烧性能的影响 认领 引用
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作者 郑舒 贾丰春 黄沛沛 《河南机电高等专科学校学报》 2008年第5期24-26,共3页
采用溶胶凝胶法制备CuO/Y2O3-ZrO2-Al2O3催化剂。研究了反应气甲烷与空气体积比和反应气体流速对CuO/Y2O3-ZrO2-Al2O3催化剂性能的影响,结果显示:VCH4:VAir=1:25且气体流速为1800Loh-1时,该催化剂具有较好的催化活性和高温热稳定性。
关键词 甲烷 催化燃烧 Y2O3-ZrO2-Al2O3载体 CuO活性物质
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Synthesis of neodymium modified CeO_2-ZrO_2-Al_2O_3 support materials and their application in Pd-only three-way catalysts 认领 引用 被引量：8
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作者 彭娜 周菊发 +3 位作者 陈山虎 罗秀超 陈耀强 龚茂初 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第4期342-349,共8页
Ce-Zr-Al-Nd2O3 （CZAN） support materials were prepared by co-precipitation and impregnation methods, respectively. They were characterized by X-ray diffTaction （XRD）, low temperature nitrogen adsorption-desorption,... Ce-Zr-Al-Nd2O3 （CZAN） support materials were prepared by co-precipitation and impregnation methods, respectively. They were characterized by X-ray diffTaction （XRD）, low temperature nitrogen adsorption-desorption, oxygen pulsing technique, H2-temperamre programmed reduction （H2-TPR） and X-ray photoelectron spectroscopy （XPS）. The Pd-only three-way catalysts （Pd-TWC） supported on these materials were prepared by incipient wetness method and studied by activity tests. The results demonstrated that the CZAN supports obtained by the two methods showed better structural, textural and redox properties than the CZA without Nd2O3, and the addition of Nd203 improved the catalytic activity of TWC. Especially, the CZAN-i support prepared by impregnation method had better thermal stability and redox property. Meanwhile, the Pd/CZAN-i catalyst exhibited the best catalytic performance. XPS measurements indicated that the Nd-modified samples possessed more Ce3＋ and oxygen vacancies on the surface of samples, which led to a better redox property. The excellent redox property of support materials helped to improve the catalytic activity of TWC. 展开更多
关键词 CeO2-ZrO2-Al2O3 support materials Nd2O3 Ce-O-Nd bonds Pd-only three-way catalysts redox property rare earths
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Catalytic Partial Oxidation of Methane over Ni/CeO_2-ZrO_2-Al_2O_3 认领 引用 被引量：10
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作者 梅大江 陈耀强 +3 位作者 钟俊波 魏振玲 马迪 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第3期311-315,共5页
Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron sp... Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron spectroscopy（XPS）.Through the test of catalytic partial oxidation of methane（CPOM）,Ni/CeO2-ZrO2-Al2O3 displayed the highest activity,which resulted from its largest BET area and best NiO dispersion.Furthermore,Ni/CeO2-ZrO2-Al2O3 maintained a long-time stability in CPOM,which was attributed to its best coking resistance among all the prepared catalysts. 展开更多
关键词 Ni/CeO2-ZrO2-Al2O3 catalyst catalytic partial oxidation of methane carbon deposition rare earths
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Performance of Pd/CeO_2-ZrO_2-Al_2O_3 catalyst for motorcycle 认领 引用 被引量：5
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作者 赵明 陈山虎 +2 位作者 张晓玉 龚茂初 陈耀强 《Journal of Rare Earths》 SCIE EI CAS 2009年第5期728-732,共5页
The Pd-only catalysts for motorcycle were prepared by impregnating CeO2-ZrO2-Al2O3 and CeO2-ZrO2+Al2O3 with PdCl2 aqueous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC) and H2-tem... The Pd-only catalysts for motorcycle were prepared by impregnating CeO2-ZrO2-Al2O3 and CeO2-ZrO2+Al2O3 with PdCl2 aqueous solution and characterized by X-ray diffraction (XRD), oxygen storage capacity (OSC) and H2-temperature-programmed reduction (H2-TPR) methods. The XRD result indicated that the CeO2-ZrO2-Al2O3 compound prepared by co-precipitation formed a single solid solution and had good thermal stability, and Pd phase was not observed in all catalysts. The TPR results showed that the reduction temperature of Pd/CeO2-ZrO2-Al2O3 catalyst was lower than that of Pd/CeO2-ZrO2+Al2O3 catalyst whether they were fresh or aged catalysts. The Pd/CeO2-ZrO2-Al2O3 exhibited high three-way catalytic activity at low temperature, high thermal stability, and wide working window, suggesting a great potential for applications. 展开更多
关键词 CeO2-ZrO2-Al2O3 palladium TWC H2-TPR motorcycle rare earths
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Structures and oxygen storage capacities of CeO_2-ZrO_2-Al_2O_3 ternary oxides prepared by a green route:supercritical anti-solvent precipitation 认领 引用 被引量：9
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作者 黄盼 姜浩锡 张敏华 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第6期524-528,共5页
CeO2-ZrO2-Al2O3 ternary oxides were successfully prepared by a green route of supercritical anti-solvent precipitation with supercritical CO2 as anti-solvent and methanol as solvent. The structures and oxygen storage ... CeO2-ZrO2-Al2O3 ternary oxides were successfully prepared by a green route of supercritical anti-solvent precipitation with supercritical CO2 as anti-solvent and methanol as solvent. The structures and oxygen storage capacities of these ternary oxides were characterized by XRD, Raman spectra and oxygen storage capacity measurements. It was found that Al3＋ and Zr4＋ inserted into CeO2 lattice, forming CeO2-ZrO2-Al2O3 solid solution. The concentration of aluminium isopropoxide in the solution affected the concentration of oxygen vacancy and the distortion of oxygen sublattice which were responsible for the oxygen storage capacity. The rapidest oxygen uptakeelease rate and maximum total oxygen storage capacity （122.0 mmolO2/molCeO2） were obtained with the aluminitun isopropoxide concentration at 0.2 wt.% in the solution. 展开更多
关键词 CeO2-ZrO2-Al2O3 solid solution supercritical anti-solvent precipitation oxygen storage capacity rare earths
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ZrO_2含量对CuO/YSZ-Al_2O_3催化剂催化甲烷燃烧性能的影响 认领 引用 被引量：2
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作者 郑舒 王树新 《石油炼制与化工》 CAS CSCD 北大核心 2013年第8期19-22,共4页
为获得高活性和高温稳定性好的甲烷燃烧催化剂,采用溶胶凝胶法制备了CuO/YSZ-Al2O3催化剂。通过改变ZrO2在YSZ-Al2O3载体中的含量制得不同ZrO2含量的CuO/YSZ-Al2O3催化剂,并考察ZrO2含量对催化剂催化甲烷燃烧性能的影响,同时利用BET、XR... 为获得高活性和高温稳定性好的甲烷燃烧催化剂,采用溶胶凝胶法制备了CuO/YSZ-Al2O3催化剂。通过改变ZrO2在YSZ-Al2O3载体中的含量制得不同ZrO2含量的CuO/YSZ-Al2O3催化剂,并考察ZrO2含量对催化剂催化甲烷燃烧性能的影响,同时利用BET、XRD等测试手段对催化剂进行了表征。结果表明:ZrO2在载体中存在最佳含量,当ZrO2质量分数为32.5%时,催化剂的活性和高温稳定性最好;该催化剂经1 000℃、5h老化后,仍具有较高的比表面积和高温稳定性,是一种性能优异的甲烷燃烧催化剂。 展开更多
关键词 甲烷 催化燃烧 Y2O3-ZrO2-Al2O3 CuO活性组分
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CeO_2-ZrO_2-La_2O_3-Al_2O_3 composite oxide and its supported palladium catalyst for the treatment of exhaust of natural gas engined vehicles 认领 引用 被引量：5
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作者 Xiaoyu Zhang Enyan,Long +5 位作者 Yile Li Jiaxiu Guo Lijuan Zhang Maochu Gong Minghua Wang Yaoqiang Chen 《Journal of Natural Gas Chemistry》 2009年第2期139-144,共6页
Composite supports CeO2-ZrO2-Al2O3（CZA） and CeO2-ZrO2-Al2O3-La2O3（CZALa） were prepared by co-precipitation method. Palladium catalysts were prepared by impregnation and their purification ability for CH4, CO and N... Composite supports CeO2-ZrO2-Al2O3（CZA） and CeO2-ZrO2-Al2O3-La2O3（CZALa） were prepared by co-precipitation method. Palladium catalysts were prepared by impregnation and their purification ability for CH4, CO and NOx in the mixture gas simulated the exhaust from natural gas vehicles （NGVs） operated under stoichiometric condition was investigated. The effect of La2O3 on the physicochemical properties of supports and catalysts was characterized by various techniques. The characterizations with X-ray diffraction （XRD） and Raman spectroscopy revealed that the doping of La2O3 restrained effectively the sintering of crystallite particles, maintained the crystallite particles in nanoscale and stabilized the crystal phase after calcination at 1000 ℃. The results of N2-adsorption, H2-temperatnre-programmed reduction （H2-TPR） and oxygen storage capacity （OSC） measurements indicated that La2O3 improved the textural properties, reducibility and OSC of composite supports. Activity testing results showed that the catalysts exhibit excellent activities for the simultaneous removal of methane, CO and NOx in the simulated exhaust gas. The catalysts supported on CZALa showed remarkable thermal stability and catalytic activity for the three pollutants, especially for NOx. The prepared palladium catalysts have high ability to remove NOx, CH4 and CO, and they can be used as excellent catalysts for the purification of exhaust from NGVs operated under stoichiometric condition. The catalysts reported in this work also have significant potential in industrial application because of their high performance and low cost. 展开更多
关键词 Pd catalysts natural gas vehicles exhaust methane oxidation NOx conversion CeO2-ZrO2-Al2O3 La2O3
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固体酸催化剂MxOy-ZrO2-Al2O3催化果糖分解制备5-羟甲基糠醛的研究 认领 引用 被引量：4
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作者 黎演明 李秉正 +1 位作者 吴学众 黄日波 《现代化工》 CAS CSCD 北大核心 2012年第11期63-66,共4页
采用溶胶-凝胶法制备了MxOy-ZrO2-Al2O3固体酸催化剂,通过催化果糖分解制备5-羟甲基糠醛(5-HMF)的反应对催化剂的催化性能进行评估。结果表明,相对于其他MxOy-ZrO2-Al2O3催化剂,La2O3-ZrO2-Al2O3具有更高的催化活性。在其催化作用下,于... 采用溶胶-凝胶法制备了MxOy-ZrO2-Al2O3固体酸催化剂,通过催化果糖分解制备5-羟甲基糠醛(5-HMF)的反应对催化剂的催化性能进行评估。结果表明,相对于其他MxOy-ZrO2-Al2O3催化剂,La2O3-ZrO2-Al2O3具有更高的催化活性。在其催化作用下,于120℃与二甲基亚砜溶液反应75 min,5-HMF的收率高达74.91%,生成5-HMF的选择性为77.71%。研究发现La2O3-ZrO2-Al2O3的晶体结构对催化活性有着显著影响,随着催化剂由高结晶结构向无定形转变时,其催化活性出现大幅度减弱。此外,La2O3-ZrO2-Al2O3还具有优异回收性能,重复使用2次后其催化活性几乎保持不变。 展开更多
关键词 果糖 5-羟甲基糠醛 固体酸 MxOy-ZrO2-Al2O3 制备
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Structure and mechanical properties of ZrO_2-mullite nano-ceramics in SiO_2-Al_2O_3-ZrO_2 system 认领 引用 被引量：6
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作者 梁叔全 谭小平 +1 位作者 李少强 唐艳 《Journal of Central South University of Technology》 2007年第1期1-6,共6页
ZrO2-mullite nano-ceramics were fabricated by in-situ controlled crystallizing from SiO2-Al2O3-ZrO2 amorphous bulk. The thermal transformation sequences of the SiO2-Al2O3-ZrO2 amorphous bulk were investigated by X-ray... ZrO2-mullite nano-ceramics were fabricated by in-situ controlled crystallizing from SiO2-Al2O3-ZrO2 amorphous bulk. The thermal transformation sequences of the SiO2-Al2O3-ZrO2 amorphous bulk were investigated by X-ray diffraction, infrared spectrum, scanning electron microscope and differential scanning calorimetric. And the mechanical properties of the nano-ceramics were studied. The results show that the bulks are still in amorphous state at 900 ℃ and the t-ZrO2 forms at about 950 ℃ with a faint spinel-like phase which changes into mullite on further heating. ZrO2 and mullite become major phases at 1 100 ℃ and an amount of m-ZrO2 occur at the same time. The sample heated at 950 ℃ for 2 h and then at 1 100 ℃ for 1 h shows very dense and homogenous microstructure with ball-like grains in size of 20-50 nm. With the increase of crystallization temperature up to 1 350 ℃, the grains grow quickly and some grow into lath-shaped grains with major diameter of 5 μm. After two-step treatment the highest micro-hardness, flexural strength and fracture toughness of the samples are 13.72 GPa, 520 MPa and 5.13 MPa·m1/2, respectively. 展开更多
关键词 SiO2-Al2O3-ZrO2 system amorphous bulk heat treatment structural change mechanical properties
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机械合金化制备Al-Al_2O_3-ZrO_2-Y_2O_3复合涂层及其性能研究 认领 引用 被引量：1
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作者 郭燕 沈以赴 +2 位作者 李博 丁润东 胡永志 《稀有金属与硬质合金》 CAS CSCD 北大核心 2012年第3期18-22,共5页
通过机械合金化在室温下于304不锈钢表面成功制得Al-Al2O3-ZrO2-Y2O3复合涂层。通过相关实验分析了复合涂层的组织形貌、显微硬度及高温氧化性能。结果表明:随着球磨时间的增加,涂层厚度先增加后减小;当球磨时间为8h时,涂层最为致密,平... 通过机械合金化在室温下于304不锈钢表面成功制得Al-Al2O3-ZrO2-Y2O3复合涂层。通过相关实验分析了复合涂层的组织形貌、显微硬度及高温氧化性能。结果表明:随着球磨时间的增加,涂层厚度先增加后减小;当球磨时间为8h时,涂层最为致密,平均厚度约为200μm;当球磨时间为14h时,涂层部分剥落,涂层厚度减小。涂层的显微硬度明显高于基体,且从表层到基体呈梯度下降,最高显微硬度值达HV0.1525,为基体硬度的2倍多。Al-Al2O3-ZrO2-Y2O3复合涂层的抗高温氧化性能良好。 展开更多
关键词 机械合金化 高能球磨 Al-Al2O3-ZrO2-Y2O3 复合涂层 显微硬度 高温氧化
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微纳米添加剂α-Al2O3在表面涂层领域的应用现状及市场前景 认领 引用
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作者 伏建康 杨茂盏 +2 位作者 冉长荣 郭太雄 张千峰 《材料科学》 2025年第3期468-475,共8页
微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层... 微纳米α-Al2O3是一种重要的功能材料,因其优异的硬度、耐磨性、耐腐蚀性和高热稳定性,在表面涂层领域得到了广泛应用。随着微纳米技术的发展,微纳米级α-Al2O3作为添加剂在各涂层体系中的应用得到了深入研究,显示出其能够显著改善涂层性能的潜力。微纳米α-Al2O3颗粒具有较大的比表面积和表面活性,能够增强涂层的机械性能,如硬度和耐磨性,同时提高涂层的耐腐蚀性和耐高温性能。微纳米α-Al2O3也是一种极优良的改性材料,其与有机硅烷、树脂等材料复合改性,既能大幅提升转化膜的应用效果,对其稳定性和耐候性也有较大的促进作用。在金属表面涂层、陶瓷涂层以及复合材料涂层中,微纳米α-Al2O3添加剂被广泛用于提高涂层的使用寿命和稳定性。此外,它在电子器件、航天航空和汽车工业等高技术领域也展现了广阔的应用前景。未来,随着表面技术的发展,微纳米α-Al2O3无铬钝化领域的市场应用将大幅增长,与其他功能性材料的协同作用和复合材料开发也将成为研究的重点。Micro-nano α-Al2O3 is an important functional material, because of its excellent hardness, wear resistance, corrosion resistance and high thermal stability, has been widely used in the field of surface coating. With the development of micro-nano technology, the application of micro-nano α-Al2O3 as an additive in various coating systems has been deeply studied, showing its potential to significantly improve coating properties. Micro-nano α-Al2O3 particles have a large specific surface area and surface activity, which can enhance the mechanical properties of the coating, such as hardness and wear resistance, while improving the corrosion resistance and high temperature resistance of the coating. Micro-nano α-Al2O3 is also an excellent modified material, and its composite modification with organosilane, resin and other materials can greatly improve the application effect of conversion film, and also has a greater role in promoting its stability and weather resistance. In metal surface coatings, ceramic coatings and composite coatings, micro-nano α-Al2O3 additives are widely used to improve the service life and stability of coatings. In addition, it also shows broad application prospects in high-tech fields such as electronic devices, aerospace and automotive industries. In the future, with the development of surface technology, the market application of micro-nano α-Al2O3 chromium-free passivation will grow significantly, and the synergy with other functional materials and the development of composite materials will also become the focus of research. 展开更多
关键词 纳米α-Al2O3 无铬钝化涂层 陶瓷膜 表面硬度 耐蚀性
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Photocatalytic activity of TiO_2 supported SiO_2-Al_2O_3 aerogels prepared from industrial fly ash 认领 引用 被引量：10
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作者 王慧龙 齐慧萍 +2 位作者 魏晓娜 刘潇彧 姜文凤 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第11期2025-2033,共9页
A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The struct... A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The structural features of the TiO2/SiO2-Al2O3 aerogel composite were investigated by X-ray powder diffraction,Fourier transform infrared spectroscopy,transmission electron microscopy,gas adsorption measurements and diffuse reflectance UV-visible spectroscopy.The optimal conditions for photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol（DNBP],included an initial DNBP concentration of 0.167 mmol/L at pH = 4.86 with a catalyst concentration of 6 g/L,under visible light irradiation for 5 h.A plausible mechanism is proposed for the photocatalytic degradation of DNBP.Our composite showed higher photocatalytic activity for DNBP degradation than that of pure TiO2.This indicates that this material can serve as an efficient photocatalyst for degradation of hazardous organic pollutants in wastewater. 展开更多
关键词 Titania SiO2-Al2O3 aerogel Composite photocatalyst Industrial fly ash 2-sec-butyl-4 6-dinitrophenol Wastewater treatment
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共沉淀法制备的CeO2-ZrO2-Al2O3材料及性能 认领 引用 被引量：11
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作者 李红梅 周菊发 +4 位作者 祝清超 曾少华 魏振玲 陈耀强 龚茂初 《高等学校化学学报》 SCIE CAS 北大核心 2009年第12期2484-2486,共3页
CeO2-based oxygen materials were prepared with co-precipitation method and characterized via Brunauer-Emmet Teller(BET)method,X-ray diffraction(XRD)and temperature-programmed reduction(H2-TPR).This paper revealed that... CeO2-based oxygen materials were prepared with co-precipitation method and characterized via Brunauer-Emmet Teller(BET)method,X-ray diffraction(XRD)and temperature-programmed reduction(H2-TPR).This paper revealed that three CeO2-based oxygen storage materials are all forming homogeneous solid solution.Among the samples,CeO2-ZrO2-Al2O3(CZA)has the best textural properties and excellent thermal stability.The specific surface area and pore volume of aged CZA are 90 m2/g and 0.29 mL/g.We proposed a viewpoint:Al3+ might insert among the interspace of fluorite structure or highly dispersal in solid solutions. 展开更多
关键词 CeO2-ZrO2-Al2O3 共沉淀法 热稳定性能 结构性能 固溶体
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Fe_2O_3/YSZ-γ-Al_2O_3催化剂在甲烷催化燃烧中的催化性能研究 认领 引用 被引量：20
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作者 李丽娜 陈耀强 +1 位作者 龚茂初 向云 《高等学校化学学报》 SCIE EI CAS 北大核心 2003年第12期2235-2238,共4页
以 Fe2 O3 为活性组分 ,γ-Al2 O3 ,Zr O2 -γ-Al2 O3 及 YSZ-γ-Al2 O3 ( YSZ是用 Y2 O3 稳定 Zr O2 的催化剂载体 )为载体 ,制备了 3种甲烷燃烧催化剂 .其中以 YSZ-γ-Al2 O3 为载体的催化剂催化性能最好 .XPS检测发现 ,Zr O2 和 Y2 ... 以 Fe2 O3 为活性组分 ,γ-Al2 O3 ,Zr O2 -γ-Al2 O3 及 YSZ-γ-Al2 O3 ( YSZ是用 Y2 O3 稳定 Zr O2 的催化剂载体 )为载体 ,制备了 3种甲烷燃烧催化剂 .其中以 YSZ-γ-Al2 O3 为载体的催化剂催化性能最好 .XPS检测发现 ,Zr O2 和 Y2 O3 的存在可以增加和稳定 Fe2 O3 的表面浓度 ,同时也可减弱 Fe2 O3 与γ-Al2 O3 之间的相互作用 .Fe2 O3 质量分数为 1 0 %的 Fe2 O3 /YSZ-γ-Al2 O3 催化剂具有最佳的催化活性 .XRD测试结果表明 ,该催化剂的活性与 Fe2 O3 在载体上的分散状况有关 . 展开更多
关键词 Fe2O3/YSZ-γ-Al2O3 催化剂 甲烷 催化燃烧 催化性能 氧化铝 三氧化铁 制备
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Support Effects on Thiophene Hydrodesulfurization over Co-Mo-Ni/Al_2O_3 and Co-Mo-Ni/TiO_2-Al_2O_3 Catalysts 认领 引用 被引量：12
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作者 刘超 周志明 +2 位作者 黄永利 程振民 袁渭康 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第4期383-391,共9页
A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization （in moderate conditions：200 ＆#176;C, 12 h） of red liquor solids, a by-product of paper-making process. The prepared sulfonate... A carbon-based sulfonated catalyst was prepared by direct sulfonation and carbonization （in moderate conditions：200 ＆#176;C, 12 h） of red liquor solids, a by-product of paper-making process. The prepared sulfonated cata-lyst （SC） had aromatic structure, composed of carbon enriched inner core, and oxygen-containing （SO3H, COOH, OH） groups enriched surface. The SO3H, COOH, OH groups amounted to 0.74 mmol·g^-1, 0.78 mmol·g^-1, 2.18 mmol·g^-1, respectively. The fresh SC showed much higher catalytic activity than that of the traditional solid acid catalysts （strong-acid 732 cation exchange resin, hydrogen type zeolite socony mobile-five （HZSM-5）, sulfated zir-conia） in esterification of oleic acid. SC was deactivated during the reactions, through the mechanisms of leaching of sulfonated species and formation of sulfonate esters. Two regeneration methods were developed, and the catalytic activity can be mostly regenerated by regeneration Method 1 and be fully regenerated by regeneration Method 2, respectively. 展开更多
关键词 hydrodesulfurization support hierarchically macro-/mesoporous structure Al2O3 TiO2-Al2O3
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水蒸汽对Ni/CeO_2-ZrO_2-Al_2O_3催化剂上CO_2+CH_4重整反应的影响 认领 引用 被引量：11
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作者 李春林 伏义路 +4 位作者 孟明 卞国柱 谢亚宁 胡天斗 张静 《Chinese Journal of Chemical Physics》 SCIE CAS 北大核心 2004年第1期95-99,共5页
用水热合成法制备了Ni/CeO2 ZrO2 Al2 O3 催化剂 .进行了添加和不添加水蒸汽的CH4 +CO2 催化重整反应 ,测试了活性和稳定性 ,测量了积碳量 ,并用XAFS手段测试了催化剂Ni的K吸收边 .结果表明 ,在反应过程中有CeAlO3 的生成 ,但积碳是无... 用水热合成法制备了Ni/CeO2 ZrO2 Al2 O3 催化剂 .进行了添加和不添加水蒸汽的CH4 +CO2 催化重整反应 ,测试了活性和稳定性 ,测量了积碳量 ,并用XAFS手段测试了催化剂Ni的K吸收边 .结果表明 ,在反应过程中有CeAlO3 的生成 ,但积碳是无水蒸汽添加的反应活性降低的原因 .反应气中添加水蒸汽能够减少积碳 ,从而提高催化反应的稳定性 .由于碳原子插入Ni晶格 ,无水蒸汽反应后的最近邻Ni Ni配位数有较大幅度的减少 .添加了水蒸汽的反应 ,最近邻Ni Ni配位数比反应前减少幅度小 ,这主要是由于在反应气中添加水蒸汽减少了积碳 。 展开更多
关键词 CO2+CH4重整反应 添加水蒸汽 Ni/CeO2-ZrO2-Al2O3催化剂 XAFS 积碳
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Y_2O_3对Fe-Al-Si-B等离子熔覆层组织与性能的影响(英文) 认领 引用 被引量：11
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作者 张德库 薛浩博 +2 位作者 王克鸿 周琦 李聪 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2018年第2期469-473,共5页
采用等离子弧熔覆技术,在Q235钢板基体表面熔覆了一层Fe-Al-Si-B原位复合涂层,并通过在熔覆粉末中添加稀土氧化物Y_2O_3改善熔覆层的组织与性能。利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度仪、摩擦磨损试验机对... 采用等离子弧熔覆技术,在Q235钢板基体表面熔覆了一层Fe-Al-Si-B原位复合涂层,并通过在熔覆粉末中添加稀土氧化物Y_2O_3改善熔覆层的组织与性能。利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度仪、摩擦磨损试验机对熔覆层的组织、相组成、显微硬度及磨损性能进行了表征。结果表明:Y_2O_3的加入净化了晶界,使得晶界处夹杂物均匀化,明显改善了晶界处夹杂物的形态,形成了致密均匀、无缺陷且显著细化的熔覆层组织。当稀土氧化物Y_2O_3质量分数为0.9%时,熔覆层的硬度达到5.10 GPa,耐磨性能达到最佳。 展开更多
关键词 Y2O3 等离子熔覆 硬度 耐磨性
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