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The reaction kinetics of CO2 methanation on a bifunctional Ni/MgO catalyst

机译：二官能Ni / MgO催化剂CO2甲烷化的反应动力学

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A bifunctional Ni/MgO catalyst was prepared to catalyze CO2 methanation and make use of CO2 as an abundant hydrogen storage facility. The effect of Ni loading and MgO quality on the rate of methanation was tested in a temperature range of 533-648 K. The Ni loading was varied between 0 to 27 wt.% on MgO. To investigate the impact of matrix elements, a MgO/CaO support was tested with 21 wt.%. nickel loading. Further, the role of MgO in the bifunctional catalyst was proven. The reaction kinetics was modeled with a Langmuir-Hinshelwood approach considering the bifunctional character of the catalyst. Nickel provides the adsorbent capacity for hydrogen and is highly selective for methane. MgO activates CO2 through chemisorption. Increasing Ni loading of the catalyst increased the rate of CO2 conversion. According to the results, the mechanism of CO2 methanation did not change with Ni loading. The Ni/MgO catalyst acted as a robust, active and highly selective catalyst for CO2 methanation. With CO2 conversion of 87%, the selectivity to methane was >= 99%. Besides excellent catalytic activity the catalysts suffice the necessity of simple catalyst preparation, usage and recyclability for industrial applicability of CO2 methanation. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：制备双官能Ni / MgO催化剂以催化CO 2甲烷化并使用CO2作为丰富的储氢设施。在533-648k的温度范围内测试Ni负载和MgO质量对甲烷化率的影响。Ni载荷在0至27重量％之间变化。％对MgO。为了探讨基质元素的影响，用21重量％检测MgO / CaO载体。％。镍加载。此外，证明了MgO在双官能催化剂中的作用是被证明的。考虑到催化剂的双官能特征，用Langmuir-Hinshelwood方法进行了模拟的反应动力学。镍提供氢吸附容量，对甲烷具有高度选择性。 MgO通过化学吸附激活二氧化碳。增加催化剂的Ni负载增加了CO 2转化率。根据结果​​，CO2甲烷化的机制不随NI载荷而变化。 Ni / MgO催化剂用作CO 2甲烷化的稳健，活性和高度选择的催化剂。 CO2转化率为87％，对甲烷的选择性> = 99％。除了优异的催化活性外，催化剂足以实现简单的催化剂制备，使用和可回收性的CO 2甲烷化的工业实用性。 （c）2020朝鲜工业与工程化学学会。 elsevier b.v出版。保留所有权利。

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