Effect of metal promoters on catalytic performance of Co/AC for higher alcohols synthesis from syngas

Q3 Energy 燃料化学学报 Pub Date : 2023-11-01 DOI:10.1016/S1872-5813(23)60368-8

GUO Lei , LIU Pei-gong , GONG Kun , QI Xing-zhen , LIN Tie-jun

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Abstract

Shifting products of Fischer-Tropsch Synthesis (FTS) from paraffins to value-added higher alcohols receives great attention but remains great challenge. Herein, metal oxides of Mn, Zn, La and Zr are investigated as promoters to tune the activity and product distributions of Co/AC catalyst for syngas conversion. It is found that these promoters show different promotion effect on CO dissociation rate, the formation of Co₂C phase and the alcohols selectivity. The formed Co₂C/Co⁰ constitutes the dual active site for higher alcohols synthesis. The strongest CO dissociation rate is observed for Zn-promoted Co/AC catalyst, resulting in the highest activity and space-time yield (STY) of alcohols. The Mn promoter is most conducive to the formation of Co₂C, but slightly decreases the activity. The similar CO dissociation rate and CO conversion are obtained over both Zr- and La-promoted Co/AC catalysts, but the Zr-promoted Co/AC catalyst exhibits the highest alcohols selectivity due to the function balance between CO non-dissociative insertion and CO dissociation.

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金属促进剂对Co/AC催化合成气合成高级醇性能的影响

将费托合成(FTS)的产品从石蜡转向高附加值的高醇受到了广泛的关注，但仍然存在很大的挑战。本文研究了Mn、Zn、La和Zr的金属氧化物作为促进剂来调节Co/AC催化剂合成气转化的活性和产物分布。结果表明，这些促进剂对CO的解离速率、Co2C相的形成和醇的选择性有不同的促进作用。形成的Co2C/Co0构成了合成高级醇的双活性位点。zn促进的CO /AC催化剂CO解离率最高，醇的活性和空时产率最高。Mn启动子最有利于Co2C的形成，但略微降低了活性。Zr-和la -促进CO /AC催化剂的CO解离率和CO转化率相似，但Zr-促进CO /AC催化剂表现出最高的醇选择性，这是由于CO非解离插入和CO解离之间的功能平衡。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.