Effect of micropores on the structure and CO2 methanation performance of supported Ni/SiO2 catalyst,Greenhouse Gases: Science and Technology

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Effect of micropores on the structure and CO2 methanation performance of supported Ni/SiO2 catalyst
Greenhouse Gases: Science and Technology ( IF 2.7 ) Pub Date : 2021-09-14 , DOI: 10.1002/ghg.2116
Liang Shen ₁ , Minghui Zhu ₁ , Jing Xu ₁

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Two types of SiO₂ with different microporosities were evaluated as supports for the Ni/SiO₂ catalysts. The CO₂ methanation performance of the catalysts was evaluated, and the structure-activity relationship was elucidated with thorough characterizations. For the Ni/SiO₂ catalyst with plenty of micropores, both ultrasmall Ni nanoclusters and larger Ni nanoparticles are present. In contrast, the one with fewer micropores only contains large Ni nanoparticles. During the CO₂ methanation reaction, CO₂ can be activated to CO on small Ni nanoclusters and further converted to CH₄ on larger Ni nanoparticles. Such a tandem catalysis behavior greatly improves the CO₂ methanation activity. The CH₄ yield reaches 33.5 μmol·g^–1·s^–1 at 450 °C under 0.1 MPa with a feed H₂/CO₂ mol ratio of 4:1 and a space velocity of 30 L·h^–1·g^–1. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

微孔对负载型Ni/SiO2催化剂结构和CO2甲烷化性能的影响

评估了两种具有不同微孔率的SiO ₂作为Ni/SiO ₂催化剂的载体。评估了催化剂的CO ₂甲烷化性能，并通过全面的表征阐明了构效关系。对于具有大量微孔的Ni/SiO _{2催化剂，存在超小的Ni纳米团簇和较大的Ni纳米颗粒。}相比之下，具有较少微孔的仅包含大的Ni纳米颗粒。在 CO ₂甲烷化反应过程中，CO ₂可以在小的 Ni 纳米团簇上被活化为 CO，并在较大的 Ni 纳米粒子上进一步转化为 CH _{4 。}这种串联催化行为极大地改善了 CO₂甲烷化活动。在 450 ℃、0.1 MPa 条件下，H ₂ /CO ₂摩尔比为 4:1，空速为 30 L·h ^–1 ·g ，CH ₄产率达到 33.5 μmol·g ^–1 ·s ^–1^{– 1} . © 2021 化学工业协会和 John Wiley & Sons, Ltd.

更新日期：2021-09-14

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