Non-thermal plasma activated CO2 hydrogenation over K- and La- promoted layered-double hydroxide supported Ni catalysts

IF 2.5 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Frontiers in chemical engineering Pub Date : 2022-11-15 DOI:10.3389/fceng.2022.1027167
C. Charalambous, Shanshan Xu, Sheng Ding, Sarayute Chansai, E. Asuquo, Antonio Torres Lopez, Christopher M. A. Parlett, J. Gilmour, Arthur A. Garforth, C. Hardacre
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引用次数: 2

Abstract

The catalytic conversion of CO2 to CH4 and CO over nickel particles supported on layered-double hydroxide (MgAl) with different metal promoters was investigated under non-thermal plasma (NTP) conditions. It has been shown that lanthanum-promoted Ni catalysts significantly enhanced the CO2 conversion in comparison to the 10Ni/MgAl catalyst (33.4% vs. 89.3%). In comparison, for the potassium-promoted catalysts, CO2 conversion is similar to that of 10Ni/MgAl but the CO selectivity increased significantly (35.7% vs. 62.0%). The introduction of La and K to Ni catalysts increased the Ni dispersion and improved the reducibility of Ni species, thus affecting CO2 conversion and product selectivity. In situ DRIFTS showed similar reaction pathways for La- and K- promoted catalysts with Ni catalysts. However, the La and K promoters significantly improved the formation of formate species on the Ni surface, facilitating CO2 conversion to useful products.
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K和La促进的层状双氢氧化物负载Ni催化剂上的非热等离子体活化CO2加氢
在非热等离子体(NTP)条件下,研究了不同金属助催化剂负载在层状双氢氧化物(MgAl)上的镍颗粒上CO2催化转化为CH4和CO的反应。研究表明,与10Ni/MgAl催化剂相比,镧促进的Ni催化剂显著提高了CO2转化率(33.4%对89.3%)。相比之下,对于钾促进的催化剂,CO2转化率与10Ni/MgAl相似,但CO选择性显著提高(35.7%对62.0%)。在Ni催化剂中引入La和K增加了Ni的分散性,提高了Ni物种的还原性,从而影响了CO2转化率和产物选择性。原位DRIFTS显示La和K促进的催化剂与Ni催化剂的反应途径相似。然而,La和K促进剂显著改善了甲酸盐在Ni表面的形成,促进了CO2转化为有用的产物。
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3.50
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0.00%
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审稿时长
13 weeks
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