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Preparation of Ni based mesoporous Al2O3 catalyst with enhanced CO2 methanation performance

机译：具有增强的CO 2甲烷化性能的Ni基介孔Al 2 O 3催化剂的制备

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摘要

A Ni based mesoporous γ-Al _(2) O _(3) (MA) catalyst was prepared via partial hydrolysis without organic surfactants and employed in the carbon dioxide methanation reaction. The obtained catalysts were characterized by N _(2) adsorption–desorption, H _(2) -TPR, XRD, XPS, TG, SEM and TEM-EDS techniques. CO _(2) methanation was performed in a fixed-bed reactor. A high surface area of MA with excellent hydrothermal stability was obtained, which promoted the dispersion of nickel species, producing a better catalytic performance. Incorporation of more NiO species into the Ni/MA catalyst increased the amount of active metallic Ni sties, further improving the catalytic activity and CH _(4) selectivity. Moreover, the monolithic skeleton of MA with fabric-like walls suppressed the aggregation of active metallic Ni sites and carbon deposition, enhancing the catalyst's stability, which provides a new insight for potential industrial applications.
机译：通过不使用有机表面活性剂的部分水解制备了镍基介孔的γ-Al_（2）O _（3）（MA）催化剂，并将其用于二氧化碳甲烷化反应。通过N _（2）吸附-脱附，H _（2）-TPR，XRD，XPS，TG，SEM和TEM-EDS技术对所得催化剂进行了表征。 CO_（2）甲烷化反应在固定床反应器中进行。得到具有高水热稳定性的MA的高表面积，其促进了镍物质的分散，产生了更好的催化性能。在Ni / MA催化剂中掺入更多的NiO物种增加了活性金属Ni的含量，进一步提高了催化活性和CH_（4）的选择性。此外，MA的整体骨架具有类似织物的壁，抑制了活性金属Ni位的聚集和碳沉积，增强了催化剂的稳定性，为潜在的工业应用提供了新的见识。

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