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碳化钼材料的合成及其应用于甲烷干重整反应的研究进展 被引量:3
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作者 樊杰 贺雷 +1 位作者 王阳 陆安慧 《天然气化工—C1化学与化工》 CAS 北大核心 2021年第4期1-8,共8页
甲烷干重整(DRM,CH4+CO_(2)=2CO+2H2)是以性质稳定的CH4和CO_(2)为原料制备合成气,可同时实现两种主要温室气体的转化利用,是甲烷间接转化制备高附加值化学品的重要途径,具有重要的科学、环保意义和工业应用价值,而设计合成高效、高稳... 甲烷干重整(DRM,CH4+CO_(2)=2CO+2H2)是以性质稳定的CH4和CO_(2)为原料制备合成气,可同时实现两种主要温室气体的转化利用,是甲烷间接转化制备高附加值化学品的重要途径,具有重要的科学、环保意义和工业应用价值,而设计合成高效、高稳定、抗积炭的催化剂是实现甲烷干重整工业化应用的技术关键。贵金属催化剂活性和稳定性好,但价格昂贵限制了其应用,而碳化钼作为一种过渡金属碳化物,具有类贵金属的费米(Fermi)能级,表现出类似贵金属的活性和良好的抗积炭性能。故此综述了碳化钼材料的合成方法及其应用于甲烷干重整反应的主要研究进展,为发展新型高效非贵金属甲烷干重整催化剂提供思路和启发。 展开更多
关键词 碳化钼 甲烷干重整 类贵金属
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光化学法制备过渡金属-氮共掺杂多孔炭基CO_(2)电还原催化剂 被引量:2
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作者 胡旭 董灵玉 +1 位作者 李文翠 郝广平 《无机盐工业》 CAS CSCD 北大核心 2021年第6期8-13,共6页
过渡金属-氮共掺杂炭材料是一类高效的CO_(2)电还原催化剂。以热解聚合物制备的氮掺杂炭材料为载体,浸渍镍源,经红外灯光照2 h,利用光化学法制备了高分散的镍-氮-碳催化剂(Ni/NC)。采用扫描电镜(SEM)、物理吸附、粉末X射线衍射(XRD)、X... 过渡金属-氮共掺杂炭材料是一类高效的CO_(2)电还原催化剂。以热解聚合物制备的氮掺杂炭材料为载体,浸渍镍源,经红外灯光照2 h,利用光化学法制备了高分散的镍-氮-碳催化剂(Ni/NC)。采用扫描电镜(SEM)、物理吸附、粉末X射线衍射(XRD)、X射线光电子能谱(XPS)等手段对催化剂的形貌、结构、物相和组成进行了分析,并评价了催化剂的CO_(2)电还原反应性能。电化学性能测试结果表明,在0.5 mol/L的KHCO_(3)电解液中,镍的负载量为2%(质量分数)时催化性能最好,CO分电流密度得到有效提升,塔菲尔斜率为492 mV/dec,起始过电位为286 mV;在-0.6 V(vs.RHE)下,CO的法拉第效率为78%,在-1.0~-0.5 V(vs.RHE)内,n(CO)/n(H_(2))=0.5~3.6。 展开更多
关键词 光化学法 镍-氮共掺杂炭 多孔炭 CO_(2)电还原 电催化剂 碳中和
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Ordered macroporous boron phosphate crystals as metal-free catalysts for the oxidative dehydrogenation of propane 被引量:8
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作者 Wen-Duo Lu Xin-Qian Gao +4 位作者 Quan-Gao Wang Wen-Cui Li Zhen-Chao Zhao Dong-Qi Wang An-Hui Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第12期1837-1845,共9页
Ordered macroporous materials with rapid mass transport and enhanced active site accessibility are essential for achieving improved catalytic activity.In this study,boron phosphate crystals with a three-dimensionally ... Ordered macroporous materials with rapid mass transport and enhanced active site accessibility are essential for achieving improved catalytic activity.In this study,boron phosphate crystals with a three-dimensionally interconnected ordered macroporous structure and a robust framework were fabricated and used as stable and selective catalysts in the oxidative dehydrogenation(ODH)of propane.Due to the improved mass diffusion and higher number of exposed active sites in the ordered macroporous structure,the catalyst exhibited a remarkable olefin productivity of^16 golefin gcat^-1 h^-1,which is up to 2–100 times higher than that of ODH catalysts reported to date.The selectivity for olefins was 91.5%(propene:82.5%,ethene:9.0%)at 515℃,with a propane conversion of 14.3%.At the same time,the selectivity for the unwanted deep-oxidized CO2 product remained less than 1.0%.The tri-coordinated surface boron species were identified as the active catalytic sites for the ODH of propane.This study provides a route for preparing a new type of metal-free catalyst with stable structure against oxidation and remarkable catalytic activity,which may represent a potential candidate to promote the industrialization of the ODH process. 展开更多
关键词 Ordered macroporous material Metal-free catalyst Boron phosphate Oxidative dehydrogenation PROPANE
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Highly dispersed boron-nitride/CuO_(x)-supported Au nanoparticles for catalytic CO oxidation at low temperatures 被引量:6
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作者 Fan Wu Lei He +3 位作者 Wen-Cui Li Rao Lu Yang Wang An-Hui Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第3期388-395,共8页
Supported-Au catalysts show excellent activity in CO oxidation,where the nature of the support has a significant impact on catalytic activity.In this work,a hexagonal boron nitride(BN)support with a high surface area ... Supported-Au catalysts show excellent activity in CO oxidation,where the nature of the support has a significant impact on catalytic activity.In this work,a hexagonal boron nitride(BN)support with a high surface area and adequately exposed edges was obtained by the ball-milling technique.Thereafter,impregnation of the BN support with Cu(NO3)2 followed by calcination under air at 400℃ yielded a CuO-modified support.After Au loading,the obtained Au-CuO_(x)/BN catalyst exhibited high CO oxidation activity at low temperatures with a 50%CO conversion temperature(T50%)of 25℃ and a complete CO conversion temperature(T100%)of 80℃,well within the operational temperature range of proton exchange membrane fuel cells.However,the CO oxidation activity of Au/BN,prepared without CuO_(x) for comparison,was found to be relatively low.Our study reveals that BN alone disperses both Cu and Au nanoparticles well.However,Au nanoparticles on the surface of BN in the absence of CuO species tend to aggregate upon CO oxidation reactions.Conversely,Au nanoparticles supported on the surface of CuO-modified BN remain small with an average size of~2.0 nm before and after CO oxidation.Moreover,electron transfer between Au and Cu species possibly favors the stabilization of highly dispersed Au nanoparticles on the BN surface and also enhances CO adsorption.Thus,our results demonstrate that thermally stable and conductive CuO-modified BN is an excellent support for the preparation of highly dispersed and stable Au catalysts. 展开更多
关键词 Boron nitride Au catalyst CO oxidation CUO Electron transfer
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