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Influence of pore structures of a carbon support on the surface textures of a CO oxidation catalyst

机译：碳载体的孔结构对CO氧化催化剂表面织构的影响

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摘要

In this paper, three kinds of carbon materials, i.e., carbon spheres (non-C), microporous carbon (micro-C) and mesoporous carbon (meso-C) were synthesized. Micro-C and meso-C were prepared by adopting the microporous low silica ZSM-5 and mesoporous silica KIT-6 as templates, respectively and non-C was prepared by a hydrothermal route. The palladium loaded non-C, micro-C and meso-C supports were prepared by an impregnation method, and the catalysts were applied for CO oxidation. The Pd/meso-C exhibited the highest catalytic activity because the meso-C support had a well-ordered mesoporous structure, large BET surface area, porous channels and higher dispersion of Pd nanoparticles. By adjusting the promoter type and content, calcined temperature, the optimal prepared conditions of the catalyst were achieved: Ce loading content = 10 wt%, calcined temperature = 200 degrees C. Comparing the result of the characterization and activity, it was discovered that the Pd-Ce/meso-C-200 catalyst had a large number of active surface oxygen species, Ce3+ cationic species and Pd4+ cationic species. All of these were relatively conducive to the catalytic oxidation of CO.
机译：在本文中，合成了三种碳材料，即碳球（非C），微孔碳（micro-C）和中孔碳（meso-C）。通过以微孔低级二氧化硅ZSM-5和中孔二氧化硅KIT-6为模板分别制备Micro-C和Meso-C，并通过水热法制备非C。通过浸渍法制备载有钯的非C，微C和中碳载体，并将催化剂用于CO氧化。 Pd / meso-C表现出最高的催化活性，因为meso-C载体具有良好的介孔结构，较大的BET表面积，多孔通道和较高的Pd纳米粒子分散性。通过调节助催化剂的类型和含量，煅烧温度，达到了催化剂的最佳制备条件：铈的负载量= 10 wt％，煅烧温度= 200℃。比较了表征和活性的结果，发现Pd-Ce / meso-C-200催化剂具有大量的活性表面氧物种，Ce3 +阳离子物种和Pd4 +阳离子物种。所有这些都相对有利于CO的催化氧化。

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