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首页> 外文期刊>Catalysis science & technology >High-temperature water gas shift reaction on Ni-Cu/CeO2 catalysts: effect of ceria nanocrystal size on carboxylate formation
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High-temperature water gas shift reaction on Ni-Cu/CeO2 catalysts: effect of ceria nanocrystal size on carboxylate formation

机译：高温水煤气转移反应Ni-Cu / CeO2催化剂:二氧化铈纳米晶体的影响大小对羧酸盐的形成

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摘要

Thermally stable CeO2 nanospheres of various controllable sizes were successfully synthesized via a PVP-assisted hydrothermal method to study the effect of ceria crystal size in high-temperature water gas shift reaction. The intrinsic properties of ceria crystal size effect was explored using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Brunauer, Emmett and Teller Surface area (BET), X-ray Photon Spectroscopy (XPS), Carbon monoxide-Temperature Programmed Reduction-Mass Spectrometry (CO-TPR-MS), and in situ Diffuse Reflectance Infra-red Fourier Transform Spectroscopy (DRIFTS) techniques. The XRD, FESEM and BET results indicate that the ceria with the largest particle size and the smallest crystal size of 12 nm shows a high specific surface area of 50m(2) g(-1) after calcination at 700 degrees C. After impregnation, high metal dispersion (15%) and a high amount of surface lattice oxygen are observed on the Ni-Cu bimetallic catalyst supported on ceria with the largest particle size. This Ni-Cu/CeO2 catalyst presents high reaction rates with low apparent activation energy as compared to other Ni-Cu/CeO2 catalysts, revealing the important effect of ceria crystal and Ni-Cu alloy sizes. A further study shows that the high amount of carboxylate species on the 5Ni5Cu/CeO2 catalyst with the biggest ceria crystal size could be the inhibitor or the real intermediate species. In addition, the reaction mechanism strongly depends on the Ni-Cu surface composition.
机译：耐热CeO2团簇的各种可控大小被成功合成通过PVP-assisted水热方法研究二氧化铈晶体粒度的影响高温水煤气转移反应。二氧化铈晶体尺寸效应的内在属性探讨了用x射线衍射(XRD)、字段发射扫描电子显微镜(FESEM),Brunauer,艾美特和出纳表面积(打赌),x射线光子能谱(XPS)、碳monoxide-Temperature编程Reduction-Mass光谱法(CO-TPR-MS)和原位分散反射红外傅里叶变换光谱学(飘)技术。,结果表明,二氧化铈的打赌最大粒径和最小的晶体12海里的大小显示了一个高的比表面积50 m (2) g(1)煅烧后700度c .浸渍后,高金属分散(15%)和大量的表面晶格氧观察到在Ni-Cu双金属催化剂支持最大的二氧化铈粒子大小。反应速率较低的明显激活能量与其他Ni-Cu / CeO2催化剂相比,揭示了二氧化铈晶体的重要影响和Ni-Cu合金尺寸。羧酸盐的高数量的物种5 ni5cu / CeO2最大的二氧化铈催化剂晶粒大小可以抑制剂或真实中间物种。机制很大程度上取决于Ni-Cu表面组成。

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