Impact of grain size and reactant ratio on reduction of CO2 to CH4 by alkali metal hydride

IF 1.8 4区 材料科学 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Green Materials Pub Date : 2021-09-13 DOI:20.00029
Juan Zhao, Yu-Jun Sheng, Yun-Lei Teng, Bao-Xia Dong
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Abstract

This paper aims to investigate the influence of the grain size and the alkali metal hydride (AH, where A = lithium (Li), sodium (Na) or potassium (K))/carbon dioxide (CO2) mole ratio on carbon dioxide reduction-conversion to methane (CH4) through alkali metal hydrides at an intermediate temperature. The result of this investigation shows that the grain size and AH (A = Li, Na or K)/carbon dioxide mole ratio have a considerable effect on the methane mole percentage and output. Compared with the original sample, when the lithium or potassium hydride sample is milled for 2 h, the mole percentage and output of methane increase. When the time for which the lithium or potassium hydride sample is milled is increased from 2 to 48 h, the mole percentage and output of methane change very little. For the sodium hydride and carbon dioxide system, the grain size of the sample has little effect on the methane mole percentage and output. In brief, alkali metal hydride milled for 2 h is enough for the methanation reaction. In consideration of the AH/carbon dioxide mole ratio, the effects on different reaction systems are not consistent. Activated alkali metal hydrides can effectively convert carbon dioxide to methane under various AH/carbon dioxide mole ratios, and the higher the mole ratio of AH/carbon dioxide, the better the methanation of alkali metal hydride with carbon dioxide.
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晶粒尺寸和反应物配比对碱金属氢化物还原CO2制CH4的影响
本文旨在研究晶粒尺寸和碱金属氢化物(AH,其中A =锂(Li),钠(Na)或钾(K))/二氧化碳(CO2)摩尔比对二氧化碳通过碱金属氢化物在中温还原转化为甲烷(CH4)的影响。研究结果表明,颗粒尺寸和AH (A = Li, Na或K)/ co2的摩尔比对甲烷的摩尔百分比和产量有较大的影响。与原始样品相比,氢化锂或氢化钾样品研磨2 h后,甲烷的摩尔百分比和产量增加。当氢化锂或钾样品的磨矿时间从2 h增加到48 h时,甲烷的摩尔百分比和产量变化很小。对于氢氧化钠-二氧化碳体系,样品的晶粒尺寸对甲烷摩尔百分比和产量影响不大。简而言之,碱金属氢化物研磨2 h就足以进行甲烷化反应。考虑到AH/ co2的摩尔比,对不同反应体系的影响并不一致。活性碱金属氢化物在各种碱/二氧化碳摩尔比下均能有效地将二氧化碳转化为甲烷,且碱/二氧化碳摩尔比越高,碱金属氢化物与二氧化碳的甲烷化效果越好。
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来源期刊
Green Materials
Green Materials Environmental Science-Pollution
CiteScore
3.50
自引率
15.80%
发文量
24
期刊介绍: The focus of Green Materials relates to polymers and materials, with an emphasis on reducing the use of hazardous substances in the design, manufacture and application of products.
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