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Critical role of CoO modification on Pt/Al2O3for efficient H18-DBT dehydrogenation in LOHC systems 认领 引用
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作者 Ligang Zhang Rudong Liu +5 位作者 Chang Xu Chuanze Feng Sicong Qiu Nian Lei Kuo Liu Tao Zhang 《ENGINEERING Chemical Engineering》 SCIE EI CAS CSCD 2026年第6期37-47,共11页
Liquid organic hydrogen carriers(LOHCs)represent a highly promising strategy for hydrogen storage and long-distance transport,offering a safe and economically viable solution to key infrastructure challenges.The effec... Liquid organic hydrogen carriers(LOHCs)represent a highly promising strategy for hydrogen storage and long-distance transport,offering a safe and economically viable solution to key infrastructure challenges.The effective application of LOHCs requires dehydrogenation catalysts that strike an optimal balance between activity and stability.Herein,we report a precisely engineered CoOx-modified Pt/Al2O3catalytic system that exhibits outstanding performance in the dehydrogenation of perhydro-dibenzyltoluene(H18-DBT).Systematic investigations identify a critical CoOx loading threshold at 1 wt%,at which the catalyst achieves a maximum dehydrogenation degree(DoD)of 93%and a H2 production rate of 20.98×10³molH,molpt-1h-1 at 300°C for dehydrogenation,outperforming all the catalysts reported in the literature.However,increasing the Co loading from 1 to 10 wt%results in a sharp decline in DoD from 93%to 7.2%.With the increasing CoOx content,the cobalt species initially form amorphous CoO clusters,which subsequently transform into crystalline Co3O4.The amorphous CoO is found to be the key species responsible for enhanced dehydrogenation activity by increasing the electron density and reducing the particle size of Pt,thereby promoting dehydrogenation while suppressing the hydrogenation capability. 展开更多
关键词 LOHCs DBT CoO Pt based-bimetallic catalyst H2 storage
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Size-dependent strong metal-support interaction modulation of Pt/CoFe2O4 catalysts 认领 引用 被引量：1
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作者 Yangyang Li Jingyi Yang +1 位作者 Botao Qiao Tao Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第2期292-302,共11页
Supported metal catalysts are the backbone of heterogeneous catalysis,playing a crucial role in the modern chemical industry.Metal-support interactions(MSIs)are known important in determining the catalytic performance... Supported metal catalysts are the backbone of heterogeneous catalysis,playing a crucial role in the modern chemical industry.Metal-support interactions(MSIs)are known important in determining the catalytic performance of supported metal catalysts.This is particularly true for single-atom catalysts(SACs)and pseudo-single-atom catalysts(pseudo-SACs),where all metal atoms are dispersed on,and interact directly with the support.Consequently,the MSI of SACs and pseudo-SACs are theoretically more sensitive to modulation compared to that of traditional nanoparticle catalysts.In this work,we experimentally demonstrated this hypothesis by an observed size-dependent MSI modulation.We fabricated CoFe2O4 supported Pt pseudo-SACs and nanoparticle catalysts,followed by a straightforward water treatment process.It was found that the covalent strong metal-support interaction(CMSI)in pseudo-SACs can be weakened,leading to a significant activity improvement in methane combustion reaction.This finding aligns with our recent observation of CoFe2O4 supported Pt SACs.By contrast,the MSI in Pt nanoparticle catalyst was barely affected by the water treatment,giving rise to almost unchanged catalytic performance.This work highlights the critical role of metal size in determining the MSI modulation,offering a novel strategy for tuning the catalytic performance of SACs and pseudo-SACs by fine-tuning their MSIs. 展开更多
关键词 Strongmetal-support interaction Single-atom catalyst Pseudo-single-atom catalyst Size dependence Pt/CoFe2O4catalyst
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甲基环己烷(MCH)高效脱氢Pt/Al2O3催化剂载体性能优化及Pt的高分散机制 认领 引用 被引量：1
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作者 苏健利 李长旭 +6 位作者 陈春明 安会丽 于峰 陈树伟 潘大海 闫晓亮 李瑞丰 《化学学报》 SCIE CAS CSCD 北大核心 2026年第1期20-29,共10页
以经溶剂限域水解-聚合法所得介孔氧化铝(MA)为载体,借助焙烧条件的调控,优化MA的晶相、织构及表面性质,提高低负载量Pt(w=0.5%)在MA孔壁表面上的分散度,继而提升所得催化剂对甲基环己烷(MCH)脱氢反应的催化性能.结果表明,经450℃焙烧后... 以经溶剂限域水解-聚合法所得介孔氧化铝(MA)为载体,借助焙烧条件的调控,优化MA的晶相、织构及表面性质,提高低负载量Pt(w=0.5%)在MA孔壁表面上的分散度,继而提升所得催化剂对甲基环己烷(MCH)脱氢反应的催化性能.结果表明,经450℃焙烧后, MA载体具有γ-Al2O3晶相和较高的比表面积,且孔壁表面存在大量与Pt前体(氯铂酸)分子强静电键合作用的Ib型Al-OH,可促使Pt以超小纳米团簇形式高度均匀分散,致使所得催化剂展现出较现有Pt基催化剂更优异的MCH脱氢催化活性.例如,在300℃低温下,催化剂Pt/MA-450显示出高达2112 mmol·gPt-1·min-1的析氢速率,且在100 h反应过程或再生循环使用过程中仍能保持80%以上的初始催化活性. 展开更多
关键词 介孔材料 甲基环己烷(MCH)脱氢 Pt/Al2O3催化剂 载体-Pt前体界面作用 铝羟基
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P改性Pt/CeO2单原子催化剂的CO低温氧化催化性能研究 认领 引用 被引量：1
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作者 翟晓珊 王骞 +3 位作者 王梓林 吕岩 郭延文 丁传敏 《低碳化学与化工》 CAS 北大核心 2026年第4期31-37,共7页
CO是一种分布广泛的空气污染物,对环境和人体健康构成重大威胁。目前,CO热催化氧化被认为是最节能、最高效的转化方法,而采用传统浸渍法制备的Pt/CeO2催化剂已接近其催化性能的极限。对于负载型Pt/CeO2单原子催化剂而言,载体的表... CO是一种分布广泛的空气污染物,对环境和人体健康构成重大威胁。目前,CO热催化氧化被认为是最节能、最高效的转化方法,而采用传统浸渍法制备的Pt/CeO2催化剂已接近其催化性能的极限。对于负载型Pt/CeO2单原子催化剂而言,载体的表面性质以及金属单原子的局部配位环境对其催化性能有重要影响。通过浸渍法引入磷酸制备了P改性单原子催化剂Pt/CeO2-yPOx,利用XRD、CO-DRIFTS和FT-IR等方法对催化剂的结构进行了表征,并对其催化性能进行了研究。结果表明,当m(磷酸)/m(CeO2)≤0.0850时,Pt以单原子的形式存在于催化剂中。Pt/CeO2-yPOx中,形成了P—O—Pt配位,并且其Lewis酸量增大,也产生了微量的Brønsted酸,有利于CO吸附。同时,Pt/CeO2-yPOx的还原性能提高,所以其CO低温氧化催化性能明显提升。其中,Pt/CeO2-0.085POx催化性能最优,使得CO转化温度降低为40℃,CO转化率达到100%的温度降低为110℃。 展开更多
关键词 Pt/CeO2 CO低温氧化 P改性 单原子催化剂
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CH_4-CO_2 reforming to syngas over Pt-CeO_2-ZrO_2/MgO catalysts: Modification of support using ion exchange resin method 认领 引用 被引量：1
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作者 Min Yang Haijun Guo +1 位作者 Yansheng Li Qiong Dang 《Journal of Natural Gas Chemistry》 CSCD 2012年第1期76-82,共7页
Pt-CeO2-ZrO2/MgO （Pt-CZ/MgO） catalysts with 0.8 wt% Pt, 3.0 wt% CeO2 and 3.0 wt% ZrO2 were prepared by wet impregnation method. Support MgO was obtained using ion exchange resin method or using commercial MgO. XRD, ... Pt-CeO2-ZrO2/MgO （Pt-CZ/MgO） catalysts with 0.8 wt% Pt, 3.0 wt% CeO2 and 3.0 wt% ZrO2 were prepared by wet impregnation method. Support MgO was obtained using ion exchange resin method or using commercial MgO. XRD, BET, SEM, TEM, DTA-TG and CO2-TPD were used to characterize the catalysts. CH4-CO2 reforming to synthesis gas （syngas） was performed to test the catalytic behavior of the catalysts. The catalyst Pt-CZ/MgO-IE（D） prepared using ion exchange resin exhibits more regular structure, smaller and more unique particle sizes, and stronger basicity than the catalyst Pt-CZ/MgO prepared from commercial MgO. At 1073 K and atmospheric pressure, Pt-CZ/MgO-IE（D） catalyst has a higher activity and greater stability than Pt-CZ/MgO catalyst for CH4-CO2 reforming reaction at high gas hourly space velocity of 36000 mL/（g.h） with a stoichiometric feed of CH4 and C02. Activity measurement and characterization results demonstrate that modification of the support using ion exchange resin method can promote the surface structural property and stability, therefore enhancing the activity and stability for CH4-CO2 reforming reaction. 展开更多
关键词 Pt-CeO2-ZrO2/MgO catalyst CH4-CO2 reforming support modification stability
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The sulfur and water resistance improvement of Pt/TiO2 catalyst for CO oxidation reaction by anatase and rutile TiO2 crystal interfaces 认领 引用
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作者 Zhenxing Feng Bin Song +5 位作者 Zongcheng Zhan Lei Xu Hanlei Sun Shuo Yao Hongzhi Wang Licheng Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第9期128-139,共12页
Catalytic oxidation is an effective strategy for eliminating CO pollutant.Pt/TiO2 catalyst are one of the most active catalysts as used,but facing the issue of sulfur and water deactivation.In this study,TiO2 wa... Catalytic oxidation is an effective strategy for eliminating CO pollutant.Pt/TiO2 catalyst are one of the most active catalysts as used,but facing the issue of sulfur and water deactivation.In this study,TiO2 was synthesized using a sol-gel method,while Pt/TiO2 was prepared by impregnation method.By varying the calcination temperature of the TiO2 support,Pt/TiO2 catalysts with different proportions of anatase and rutile phases were synthesized.At the calcination temperature of 500℃,the catalysts exhibited approximately equal proportions of anatase and rutile,resulting in exceptional catalytic activity for CO oxidation,as well as improved resistance to sulfur and water in the flue gas.Consequently,the Pt/TiO2-500 catalyst achieved a CO conversion of 93%at 160℃.Even under conditions of 8%(vol)H2O and 0.016%(vol)SO2(GHSV=300000 ml·h-1·g-1),the CO conversion remained above 95%at 220℃for 46 h.The catalysts were characterized and analyzed using various techniques.The results indicated that anatasephase TiO2 exhibited weak CO adsorption capacity but strong SO2 adsorption capacity,whereas rutilephase TiO2 demonstrated strong CO adsorption capacity and weak SO2 adsorption capacity.The presence of the anatase phase mitigated the CO self-poisoning phenomenon of the catalyst,while the biphase interface reduced the adsorption and oxidation of SO2 on the catalyst's surface,significantly inhibiting the deposition of TiOSO_4.Consequently,the Pt/TiO2-500 catalyst displayed the highest CO catalytic activity along with superior resistance to sulfur and water. 展开更多
关键词 CO oxidation Pt/TiO2catalysts TiO2support Crystal phase Sulfur tolerance
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Different roles of MoO3and Nb2O5promotion in short-chain alkane combustion over Pt/ZrO2catalysts 认领 引用
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作者 Bingheng Cen Cen Tang +2 位作者 Jiqing Lu Jian Chen Mengfei Luo 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第12期2287-2295,共9页
Pt/ZrO2catalysts promoted with MoO3and Nb2O5were tested for the combustion of short-chain alkanes(namely,methane,ethane,propane,and n-hexane).For short-chain alkane combustion,the inhibition of MoO3(for... Pt/ZrO2catalysts promoted with MoO3and Nb2O5were tested for the combustion of short-chain alkanes(namely,methane,ethane,propane,and n-hexane).For short-chain alkane combustion,the inhibition of MoO3(for the methane reaction)dramatically transformed to promotion(for the ethane,propane,and n-hexane reactions)as the carbon chain length increased,whereas the remarkable promotion of Nb2O5gradually weakened with an increase in the carbon chain length.Based on a detailed study of the oxidation reactions of methane and propane over the catalysts,the different roles of the promoters in the reactions were ascribed to differences in the acidic properties of the surface and the oxidation or reduction states of the Pt species.The MoO3promoter could decorate the surface of the Pt species for a Pt-Mo/ZrO2catalyst,whereas the Nb2O5promoter on the support could be partially covered by Pt particles for a Pt-Nb/ZrO2catalyst.The formation of accessible Pt-MoO3interfacial sites,a high concentration of metallic Pt species,and a high surface acidity in Pt-Mo/ZrO2were responsible for the enhanced activity for catalytic propane combustion.The lack of enough accessible Pt-Nb2O5interfacial sites but an enhanced surface acid sites in Pt-Nb/ZrO2explained the slight improvement in activity for catalytic propane combustion.However,the stabilized Ptn+species in Pt-Nb/ZrO2were responsible for the much-improved activity for methane combustion,whereas the Ptn+species in Pt-Mo/ZrO2could be reduced during the oxidation reaction,and the fewer exposed surface Pt species because of MoO3decoration accounted for the inhibited activity for methane combustion.In addition,it can be concluded that MoO3promotion is favorable for the activation of C-C bonds,whereas Nb2O5promotion is more beneficial for the activation of C-H bonds with high energy. 展开更多
关键词 Pt/ZrO2catalyst Alkanes combustion MoO3promoter Nb2O5promoter Active site
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Pt/Cd-TiO2选择性催化CO2加氢反应的性能 认领 引用 被引量：2
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作者 张明文 周杰 王兆宇 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2025年第9期95-103,共9页
CO2加氢过程中间体CO在分子水平上的吸附/脱附行为会显著影响产物选择性.本文采用浸渍法制备了Pt/Cd-TiO2催化剂.通过X射线衍射(XRD)、H2气程序升温还原(H2-TPR)、拉曼光谱(Raman)、电子顺磁共振波谱(ESR)、透射电子显微镜(... CO2加氢过程中间体CO在分子水平上的吸附/脱附行为会显著影响产物选择性.本文采用浸渍法制备了Pt/Cd-TiO2催化剂.通过X射线衍射(XRD)、H2气程序升温还原(H2-TPR)、拉曼光谱(Raman)、电子顺磁共振波谱(ESR)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、CO2程序升温脱附(CO2-TPD)和N2气吸附-脱附实验等表征手段对Pt/Cd-TiO2催化剂进行表征,并将其应用于CO2加氢反应中.活性测试结果显示,Pt/TiO2加氢产物中CO选择性是87.5%,CH4选择性是12.5%.随着Cd2+的引入,Pt/Cd-TiO2的加氢产物中CO选择性提升至98.1%,CH4选择性降低至1.9%.以Pt/Cd-TiO2为催化剂,CO的生成温度降低至225℃(Pt/TiO2是250℃).原位傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)分析结果表明,Cd2+的引入能够降低Pt纳米颗粒(Pt NPs)表面的电子密度,Pt NPs表面电子密度的降低有利于吸附态CO(COads)脱附生成气态CO,同时抑制COads加氢生成CH4.在CO甲烷化实验中,Cd2+的引入使CH4产量降低了约6.6倍,证明Cd2+抑制了CO甲烷化生成CH4,这与Pt/Cd-TiO2在CO2加氢中CO选择性提升的结果一致.通过多种阳离子(Cd2+,Mn2+,Ba2+,K+,Na+)对Pt/TiO2进行修饰,均能提升CO选择性,其中Pt/Cd-TiO2表现出最高的CO选择性. 展开更多
关键词 二氧化碳加氢 Pt/Cd-TiO2催化剂 电子密度 一氧化碳选择性 一氧化碳吸附
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Pt-Sn-K/Al2O3催化剂催化C5~C7烷烃转化为烯烃和芳烃的反应规律 认领 引用 被引量：1
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作者 刘昌呈 陶劲文 +2 位作者 向彦娟 王杰广 马爱增 《石油学报（石油加工）》 EI CAS CSCD 北大核心 2025年第4期1023-1033,共11页
采用浸渍法制备Pt-Sn-K/Al2O3催化剂,用盐酸作竞争吸附剂控制Pt在载体径向上的分布,采用N2吸附-脱附、XRD、STEM和电子探针微区分析(EPMA)线分析对催化剂进行表征,考察Pt分布对Pt-Sn-K/Al2O3催化剂催化正己烷脱氢反应性... 采用浸渍法制备Pt-Sn-K/Al2O3催化剂,用盐酸作竞争吸附剂控制Pt在载体径向上的分布,采用N2吸附-脱附、XRD、STEM和电子探针微区分析(EPMA)线分析对催化剂进行表征,考察Pt分布对Pt-Sn-K/Al2O3催化剂催化正己烷脱氢反应性能的影响。结果表明:加入竞争吸附剂盐酸对催化剂载体结构没有明显影响,但对Pt沿径向分布有重要影响;加入质量分数1%盐酸制备的Pt(1)-Sn-K/Al2O3催化剂中Pt均匀分布,脱氢能垒最低,反应活性最高;在反应温度为530℃、反应压力为0.07 MPa、氢气/正己烷摩尔比为1、反应时间为2 h的条件下进行Pt(1)-Sn-K/Al2O3催化正己烷脱氢反应,正己烷转化率达到50.0%,C6烯烃和苯的总选择性达到82.0%。反应温度对C5~C7烷烃在Pt(1)-Sn-K/Al2O3催化剂上的脱氢反应有重要影响,随着反应温度的升高,原料烷烃转化率逐渐增大,以C6、C7直链烷烃为原料时芳烃产率显著增加,以异构烷烃为原料时反应产物以同碳数烯烃为主。 展开更多
关键词 Pt-Sn-K/Al2O3催化剂 Pt分布 烷烃 烯烃 芳烃 脱氢反应 竞争吸附剂
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ZrO2负载Pt催化巴豆醛选择性加氢 认领 引用 被引量：6
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作者 郑海影 谢冠群 +2 位作者 王晓霞 金凌云 罗孟飞 《物理化学学报》 SCIE CAS 北大核心 2010年第12期3273-3277,共5页
以高比表面积ZrO2为载体,采用浸渍法制备了负载型Pt催化剂,应用于常压下气相巴豆醛加氢反应,考察了Pt负载量和H2还原温度等对巴豆醛选择性加氢性能的影响.实验结果表明,Pt负载量(质量分数)为3%的3Pt/ZrO2催化剂经500℃还原后,具有较高... 以高比表面积ZrO2为载体,采用浸渍法制备了负载型Pt催化剂,应用于常压下气相巴豆醛加氢反应,考察了Pt负载量和H2还原温度等对巴豆醛选择性加氢性能的影响.实验结果表明,Pt负载量(质量分数)为3%的3Pt/ZrO2催化剂经500℃还原后,具有较高的巴豆醛选择性加氢性能:巴豆醛转化率为27%,巴豆醇的选择性为55%.X射线粉末衍射(XRD)分析,CO化学吸附,NH3程序升温脱附(NH3-TPD)表征结果表明Pt/ZrO2催化剂上Lewis强酸中心和适宜的Pt颗粒(约为8nm)有利于巴豆醛选择性加氢生成巴豆醇. 展开更多
关键词 加氢 Pt/ZrO2催化剂 高比表面积ZrO2 巴豆醇 Lewis酸 Pt粒子大小
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Pt/MoO3/ZrO2催化剂的制备及三效催化性能的研究 认领 引用 被引量：6
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作者 温怡芸 刘志敏 +3 位作者 蔡黎 郭家秀 龚茂初 陈耀强 《无机材料学报》 SCIE EI CAS 北大核心 2008年第6期1267-1271,共5页
采用浸渍法制备了MoO_3/ZrO_2,用低温氮吸附-脱附法和NH_3-程序升温脱附法(TPD)分别对其比表面积和酸碱性进行了表征.结果表明,MoO_3/ZrO_2具有106.8m^2/g的比表面积和超强酸的性能.用等体积浸渍法制备了Pt/MoO_3/ZrO_2催化剂,在汽车尾... 采用浸渍法制备了MoO_3/ZrO_2,用低温氮吸附-脱附法和NH_3-程序升温脱附法(TPD)分别对其比表面积和酸碱性进行了表征.结果表明,MoO_3/ZrO_2具有106.8m^2/g的比表面积和超强酸的性能.用等体积浸渍法制备了Pt/MoO_3/ZrO_2催化剂,在汽车尾气模拟气中考察了其对C_3H_8、CO和NO的催化活性.与传统三效催化剂Pt/La_2O_3/Al_2O_3相比较,Pt/MoO_3/ZrO_2具有更好的低温起燃性能和更宽的空燃比窗口,并显著地改善了C_3H_8在富氧状态下的转化效率.通过XRD、H_2-TPR对催化剂进行了表征,结果表明,Pt在催化剂载体上具有高度的分散性和优异的氧化还原性能. 展开更多
关键词 MoO3/ZrO2 Pt/MoO3/ZrO2催化剂 空燃比特性
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Al含量对Pt-SO_42-/ZrO_2-Al_2O_3固体超强酸催化正戊烷异构化性能的影响 认领 引用 被引量：13
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作者 宋华 董鹏飞 张旭 《物理化学学报》 SCIE CAS 北大核心 2010年第8期2229-2234,共6页
通过向SO24-/ZrO2催化剂中同时引入适量的Pt和Al2O3,制备出了具有较高催化性能和稳定性的Pt-SO24-/ZrO2-Al2O3型固体超强酸催化剂.以正戊烷异构化反应为探针,考察了Al含量对催化剂性能的影响;并采用X射线衍射(XRD)、比表面积测定(BET)... 通过向SO24-/ZrO2催化剂中同时引入适量的Pt和Al2O3,制备出了具有较高催化性能和稳定性的Pt-SO24-/ZrO2-Al2O3型固体超强酸催化剂.以正戊烷异构化反应为探针,考察了Al含量对催化剂性能的影响;并采用X射线衍射(XRD)、比表面积测定(BET)、红外(IR)光谱、程序升温还原(TPR)、热重-差热分析(TG-DTA)和氨-程序升温脱附(NH3-TPD)手段对催化剂进行了表征.结果表明,Al能够提高ZrO2的晶化温度,抑制硫的分解,增加催化剂的比表面积,增强硫氧键的结合,提高催化剂的还原性能,增加催化剂的酸强度和酸总量.当Al2O3含量(质量分数,w)为5.0%时,Pt-SO24-/ZrO2-Al2O3固体超强酸催化剂的催化活性最好,在100h内异戊烷收率可稳定在52.0%以上,选择性在98.2%以上. 展开更多
关键词 固体超强酸 催化剂 SO24-/ZrO2 异构化 Al2O3含量 Pt
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Preparation,characterization and catalytic properties of S_2O_82-/ZrO_2-CeO_2 solid superacid catalyst 认领 引用 被引量：34
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作者 樊国栋 沈茂 +1 位作者 张昭 贾发瑞 《Journal of Rare Earths》 SCIE EI CAS 2009年第3期437-442,共6页
A novel solid superacid catalyst S2O8^2-/ZrO2-CeO2 was prepared by a coprecipitation method and characterized by means of XRD FTIR, BET, TEM and DSC/TG analysis methods. The results indicated that incorporation of app... A novel solid superacid catalyst S2O8^2-/ZrO2-CeO2 was prepared by a coprecipitation method and characterized by means of XRD FTIR, BET, TEM and DSC/TG analysis methods. The results indicated that incorporation of appropriate amounts of Ce into the catalyst was beneficial to the formation of sole tetragonal ZrO2 and effectively prevented from the formation of monoclinic ZrO〉 and restrained the loss of sulfated species. XRD revealed the presence of tetragonal Ce0.16Zr0.84O2phase in the case of S2O8^2-/ZrO2-CeO2 calcined above 500 ℃. Catalytic activities of S2O8^2-/ZrO2-CeO2 for the esterification of lactic acid with n-butanol was studied. The results showed that the optimum conditions were as follows： calcination temperature of the catalyst 600 ℃, n（lactic acid）：n（n-butyl alcohol）=1.0：3.0, w（S2O8^2-/ZrO2- CeO2）=12.0%, reaction temperature 145 ℃, and reaction time 2 h. The esterification efficiency of lactic acid was about 96.6%. 展开更多
关键词 solid superacid catalyst S2O8^2-/ZrO2-CeO2 n-butyl lactate esterification rare earths
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Catalytic oxidation of low concentration formaldehyde over Pt/TiO2 catalyst 认领 引用 被引量：10
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作者 Yuan Su Keming Ji +3 位作者 Jiayao Xun Kan Zhang Ping Liu Liang Zhao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第1期190-195,共6页
Formaldehyde(HCHO) is an important indoor pollutant.Catalytic oxidize low concentration HCHO is an effective way to eliminate indoor pollution.In this study,a series of Pt/TiO2 catalysts are prepared by impregnatio... Formaldehyde(HCHO) is an important indoor pollutant.Catalytic oxidize low concentration HCHO is an effective way to eliminate indoor pollution.In this study,a series of Pt/TiO2 catalysts are prepared by impregnation and reduced by NaBH_4.The effects of loading amount of Pt and cry stal type of TiO2 on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are investigated.The results show that the quantity of active site and the oxygen vacancy of catalysts increa sed with increasing Pt content,which is beneficial to promote the further performance of catalysts.Nevertheless,with the further rises of Pt content,the specific surface area further decreases,and the proportion of Pt2+ species on the catalyst surface which is significant to catalytic properties also decreases,causing catalytic performance decreases.Compared with the catalyst supporting on rutile,the Pt/α-TiO2 catalyst supporting on anatase has larger specific surface area,more Pt2+ phase and easier to form oxygen vacancy in the support,which cause better catalytic performance.The catalyst with Pt content of0.1 wt% and supported by anatase TiO2 has the best catalytic performance.The HCHO conversion efficiency reaches 98% and 100% at 50℃ and 100 ℃, and the stabilization time is longer than 140 h. 展开更多
关键词 Catalyst support Catalysis Fixed-bed Pt/TiO2
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Identification of relevant active sites and a mechanism study for reverse water gas shift reaction over Pt/CeO_2 catalysts 认领 引用 被引量：10
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作者 Xiaodong Chen Xiong Su +5 位作者 Binglian Liang Xiaoli Yang Xinyi Ren Hongmin Duan Yanqiang Huang Tao Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第6期1051-1057,共7页
Reverse water gas shift (RWGS) reaction can serve as a pivotal stage in the CO2 conversion processes, which is vital for the utilization of CO2. In this study, RWGS reaction was performed over Pt/CeO2 catalysts at the... Reverse water gas shift (RWGS) reaction can serve as a pivotal stage in the CO2 conversion processes, which is vital for the utilization of CO2. In this study, RWGS reaction was performed over Pt/CeO2 catalysts at the temperature range of 200-500 degrees C under ambient pressure. Compared with pure CeO2, Pt/CeO2 catalysts exhibited superior RWGS activity at lower reaction temperature. Meanwhile, the calculated TOF and E-a values are approximately the same over these Pt/CeO2 catalysts pretreated under various calcination conditions, indicating that the RWGS reaction is not affected by the morphologies of anchored Pt nanoparticles or the primary crystallinity of CeO2. TPR and XPS results indicated that the incorporation of Pt promoted the reducibility of CeO2 support and remarkably increased the content of Ce 3 + sites on the catalyst surface. Furthermore, the CO TPSR-MS signal under the condition of pure CO2 flow over Pt/CeO 2 catalyst is far lower than that under the condition of adsorbed CO2 with H-2 -assisted flow, revealing that CO2 molecules adsorbed on Ce3+ active sites have difficult in generating CO directly. Meanwhile, the adsorbed CO2 with the assistance of H-2 can form formate species easily over Ce3+ active sites and then decompose into Ce3+-CO species for CO production, which was identified by in-situ FTIR. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B. V. and Science Press. All rights reserved. 展开更多
关键词 RWGS reaction Pt/CeO2 catalyst Formate intermediate Mechanism
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Pt和Al_2O_3改性SO_42-/ZrO_2正己烷异构化反应性能 认领 引用 被引量：22
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作者 周晓龙 余国贤 +2 位作者 金亚清 唐超 李承烈 《华东理工大学学报（自然科学版）》 EI CAS 北大核心 2007年第3期309-313,335,共5页
在保持其他制备条件,如pH、干燥条件、焙烧温度、Pt的浸渍条件以及Al2O3和Pt的含量相同的情况下,通过Al的不同引入方法,即共沉淀法(CP)、成型法(SH)、悬浮法(SU)和混和法(MI),制备了4种Pt-SO42-/ZrO2-Al2O3(PSZA)催化剂。使用N2吸附和... 在保持其他制备条件,如pH、干燥条件、焙烧温度、Pt的浸渍条件以及Al2O3和Pt的含量相同的情况下,通过Al的不同引入方法,即共沉淀法(CP)、成型法(SH)、悬浮法(SU)和混和法(MI),制备了4种Pt-SO42-/ZrO2-Al2O3(PSZA)催化剂。使用N2吸附和微库仑仪分析了催化剂的组织结构和硫含量。分别使用X射线光散射仪(XRD)、H2程序升温还原(TPR)及NH3程序升温解析(TPD)研究了催化剂的晶相结构、氧化还原性质和表面酸性质。在固定床反应器上考察了反应温度对催化剂正己烷异构化反应的影响和异构化产物分布。成型法催化剂仅探测到四方晶相,表明该种Al的引入方法延缓了四方相转为单斜相;并且成型法催化剂具有一个强的最低的TPR还原峰温度,表明Al的成型引入法增强了硫的还原。催化考评结果表明成型法催化剂具有最高的催化性能。催化剂的物化表征结果表明了催化活性同催化剂的氧化还原性质关联较好,而同硫含量、酸强度及强酸位数量关联性不好。实验结果表明Al的引入方式对于PSZA催化剂在正己烷异构化中具有高催化活性非常关键。 展开更多
关键词 正己烷 异构化 Pt和氧化铝改性SO42-/ZrO2
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Propene and CO oxidation on Pt/Ce-Zr-SO_42- diesel oxidation catalysts:Effect of sulfate on activity and stability 认领 引用 被引量：9
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作者 顾蕾 陈晓 +3 位作者 周瑛 朱秋莲 黄海凤 卢晗锋 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第3期607-616,共10页
Platinum/cerium-zirconium-sulfate（Pt/Ce-Zr-SO_4^（2-）） catalysts were prepared by wetness impregnation.Catalytic activities were evaluated from the combustion of propene and CO.Sulfate（SO_4^（2-））addition improv... Platinum/cerium-zirconium-sulfate（Pt/Ce-Zr-SO_4^（2-）） catalysts were prepared by wetness impregnation.Catalytic activities were evaluated from the combustion of propene and CO.Sulfate（SO_4^（2-））addition improved the catalytic activity significantly.When using Pt/Ce-Zr-SO_4^（2-） with 10 wt%SO_4^（2-）,the temperature for 90%conversion of propene and CO decreased by 75℃ compared with Pt/Ce-Zr.The conversion exceeded 95%at 240℃ even after 0.02%sulfur dioxide poisoning for 20 h.Temperature-programmed desorption of CO and X-ray photoelectron spectroscopy analyses revealed an improvement in Pt dispersion onto the Ce-Zr-SO_4^（2-） support,and the increased number of Pt particles built up more Pt^（-）-（SO_4^（2-））^（-） couples,which resulted in excellent activity.The increased total acidity and new Bronsted acid sites on the surface provided the Pt/Ce-Zr-SO_4^（2-） with good sulfur resistance. 展开更多
关键词 Diesel oxidation catalyst Pt/Ce-Zr-SO_4^（2-） catalyst Sulfur resistance Catalytic oxidation
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Highly selective CO methanation over amorphous Ni-Ru-B/ZrO2catalyst 认领 引用 被引量：15
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作者 Qi Hai Liu Xin Fa Dong Wei Ming Lin 《Chinese Chemical Letters》 SCIE CAS 2009年第8期889-892,共4页
Amorphous Ni-Ru-B/ZrO2 catalyst was prepared by the means of chemical reduction,and selective CO methanation as a strategy for CO removal in fuel processing applications was investigated over the amorphous Ni-Ru-B/ZrO... Amorphous Ni-Ru-B/ZrO2 catalyst was prepared by the means of chemical reduction,and selective CO methanation as a strategy for CO removal in fuel processing applications was investigated over the amorphous Ni-Ru-B/ZrO2 catalyst.The result showed that,at the temperature of 210-230℃,the catalyst was shown to be capable of reducing CO in a hydrogen-rich reformate to less than 10 ppm,while keeping the CO2conversion below 1.55%and the hydrogen consumption below 6.50%.?2009 Xin Fa Dong.Published by Elsevier B.V.on behalf of Chinese Chemical Society.All rights reserved. 展开更多
关键词 Selective methanation CO Amorphous Ni-Ru-B/ZrO2 catalyst
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Effect of ZrO_2 Crystalline Phase on the Performance of Ni-B/ZrO_2 Catalyst for the CO Selective Methanation 认领 引用 被引量：8
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作者 刘其海 廖列文 +1 位作者 刘自力 董新法 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第3期434-438,共5页
Amorphous Ni-B/ZrO2 catalysts were prepared by coprecipitation-chemical reduction with KBH4 aqueous solution,and various crystalline phase ZrO2(amorphous-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2) supported Ni-B cataly... Amorphous Ni-B/ZrO2 catalysts were prepared by coprecipitation-chemical reduction with KBH4 aqueous solution,and various crystalline phase ZrO2(amorphous-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2) supported Ni-B catalysts were obtained by thermal treatment in 5%H2-N2 stream at different temperature.The effect of ZrO2 polymorphs and the treatment temperature on the catalytic performance for the CO selective methanation were investigated,and the catalysts were characterized by N2 physisorption,Powder X-ray diffraction(XRD), Temperature-Programmed Desorption(CO-TPD and H2-TPD),and Differential Scanning Calorimeter(DSC).The treatment temperature affected strongly the crystalline structure of ZrO2,and the CO methanation activity and selectivity of the Ni-B/ZrO2 catalysts were significantly influenced by the crystalline phase of ZrO2.Of the three forms of ZrO2 polymorphs(amorphou-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2),the amorphous-ZrO2 supported nickle catalyst showed highest CO methanation activity,attributing in large part to the largest specific surface area and the optimum CO/H2 absorption intensity of the Ni-B/amorphous-ZrO2 catalyst. 展开更多
关键词 crystalline phase carbon monoxide selective methanation Ni-B/ZrO2 catalyst
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Selective catalytic methanation of CO in hydrogen-rich gases over Ni/ZrO2catalyst 认领 引用 被引量：26
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作者 Qihai Liu Xinfa Dong +1 位作者 Xinman Mo Weiming Lin 《Journal of Natural Gas Chemistry》 2008年第3期268-272,共5页
Ni/ZrO2 catalysts were prepared by the incipient-wetness impregnation method and were investigated in activity and selectivity for the selective catalytic methanation of CO in hydrogen-rich gases with more than 20 vol... Ni/ZrO2 catalysts were prepared by the incipient-wetness impregnation method and were investigated in activity and selectivity for the selective catalytic methanation of CO in hydrogen-rich gases with more than 20 vol%CO2.The result showed that Ni loadings significantly influenced the performance of Ni/ZrO2 catalyst.The 1.6 wt%Ni loading catalyst exhibited the highest catalytic activity among all the catalysts in the selective methanation of CO in hydrogen-rich gas.The outlet concentration of CO was less than 20 ppm with the hydrogen consumption below 7%,at a gas-hourly-space velocity as high as 10000 h-1 and a temperature range of 260°C to 280°C.The X-ray diffraction(XRD)and temperature programmed reduction(TPR)measurements showed that NiO was dispersed thoroughly on the surface of ZrO2 support if Ni loading was under 1.6 wt%.When Ni loading was increased to 3 wt%or above,the free bulk NiO species began to assemble,which was not favorable to increase the selectivity of the catalyst. 展开更多
关键词 selective methanation CO removal Ni/ZrO2 catalyst hydrogen-rich gases fuel cell
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