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首页> 外文期刊>Catalysis science & technology >Effect of ceria promotion on the catalytic performance of Ni/SBA-16 catalysts for CO(2)methanation
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Effect of ceria promotion on the catalytic performance of Ni/SBA-16 catalysts for CO(2)methanation

机译：二氧化铈促进对催化的影响Ni / SBA-16催化剂的性能

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摘要

Ni/SBA-16 catalysts doped with Ce having cage-like mesopores were synthesized and tested in the CO(2)methanation reaction. The effect of the Ce promoter (10 and 20 wt%) on the catalytic performance of Ni/SBA-16 catalysts for CH(4)formation was evaluated. The catalysts were characterized by N(2)sorption, XRD, TEM, HRTEM, XPS, H-2-TPR, and CO2-TPD methods. It was found that the Ni and Ce particles were well confined inside the cage-like mesopores of SBA-16. The methanation tests indicated that Ni/Ce/SBA-16 (10 or 20 wt%) showed better catalytic performance than Ce-free Ni/SBA-16. The best CO(2)conversion (68.9%) and highest CH(4)selectivity (96.4%) were obtained over 10Ni/10Ce/SBA-16 at 350 degrees C, which was attributed to the highly dispersed Ni and Ce species over SBA-16, the small particle size of metallic Ni and CeO2, the highest Ce3+/(Ce3++ Ce4+) ratio and the largest number of medium basic sites. On increasing the Ce loading to 20 wt%, the catalytic activity decreased, which was assigned to a decrease in Ce dispersion, an increase of Ni(0)particle size, an increase of the number of Ni particles outside the SBA-16 support and inhomogeneous dispersion of Ce, a decrease of the Ce3+/(Ce3++ Ce4+) ratio, and finally a decrease of the medium basicity.
机译：Ni / SBA-16催化剂掺杂Ce在笼子形中孔合成和测试有限公司(2)甲烷化反应。启动子(10和20 wt %)催化Ni / SBA-16催化剂的性能CH(4)形成评估。以N(2)吸附、XRD、TEM、HRTEM、XPS、H-2-TPR CO2-TPD方法。倪和Ce粒子被限制在笼子形SBA-16间隙孔。甲烷化测试表明,镍/ Ce / SBA-16 (10或20 wt %)表现出更好的催化性能比Ce-free Ni / SBA-16。(68.9%)和CH(4)选择性最高(96.4%)获得了10 ni / ce / SBA-16在350摄氏度,这是归因于高度分散镍吗和Ce物种SBA-16,小粒子大小的金属镍,CeO2最高Ce3 + / (Ce3 + + Ce4 +)和最大数量的比例中基本的网站。20 wt %,催化活性降低,这是分配给一个Ce下降分散,增加镍(0)粒子大小,一个增加外的镍颗粒的数量SBA-16支持和不均匀分散Ce,减少Ce3 + / (Ce3 + + Ce4 +)比,最后减少中等碱度。

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