Nickel Nanoparticles Encapsulated in Microporous Graphenelike Carbon (Ni@MGC) as Catalysts for CO2 Methanation,Industrial & Engineering Chemistry Research

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Nickel Nanoparticles Encapsulated in Microporous Graphenelike Carbon (Ni@MGC) as Catalysts for CO2 Methanation
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-11-01 00:00:00 , DOI: 10.1021/acs.iecr.9b03789
Junbiao Wu ₁ , Zhenshun Jin ₁ , Bo Wang ₁ , Yide Han ₁ , Yan Xu ₁ , Zhiqiang Liang ₂ , Zhuopeng Wang ₁

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The catalytic hydrogenation of CO₂ to methane as a promising solution for the utilization of CO₂ has aroused intensive attention based on the viewpoints of sustainable use of energy and environmental concern. In this work, nickel nanoparticles encapsulated in microporous graphenelike carbon (MGC) were prepared and evaluated as catalysts for CO₂ methanation. Nickel nanoparticles of sub-7 nm are well dispersed within the carbon support, owing to the spatial confinement provided by the unique ordered microporous structure of MGC. The optimal catalyst (15% Ni@MGC) exhibits high catalytic activity (50% CO₂ conversion) and methane selectivity (96%) at 400 °C with space time yield (STY_CH₄) up to 2066 g_CH₄ kg_cat^–1 h^–1. The Ni@MGC catalyst also shows excellent long-term stability, which is superior to that of Ni catalysts supported on commercial carbons whose structure does not provide the additional confinement effect.

中文翻译：

包覆在微孔石墨烯碳中的镍纳米粒子（Ni @ MGC）作为CO2甲烷化的催化剂

基于能量的可持续利用和对环境的关注，作为利用CO _2的有前景的解决方案，CO ₂催化加氢成甲烷引起了广泛的关注。在这项工作中，制备了包裹在微孔石墨烯状碳（MGC）中的镍纳米颗粒，并将其评估为CO ₂甲烷化的催化剂。由于MGC独特的有序微孔结构所提供的空间限制，低于7 nm的镍纳米粒子很好地分散在碳载体中。最佳催化剂（15％Ni @ MGC）在400°C时表现出高催化活性（50％CO ₂转化率）和甲烷选择性（96％），时空产率（STY _CH_₄）高达2066 g_{CH ₄}千克_猫^–1小时^–1。Ni @ MGC催化剂还显示出优异的长期稳定性，这优于负载在商品碳上的Ni催化剂的稳定性，该结构没有提供额外的限制作用。

更新日期：2019-11-04

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