Influence of pretreatment conditions on the structure and catalytic performance of supported cobalt catalysts derived from metal-organic frameworks

Q3 Energy

燃料化学学报 Pub Date : 2023-09-01 DOI:10.1016/S1872-5813(23)60352-4

Jia-qiang SUN , Shen-ke ZHENG , Jian-gang CHEN

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引用次数: 0

Abstract

Supported cobalt catalysts (Co@C-ZnZrO₂ and Co/ZnZrO₂) were prepared through a metal-organic frameworks (MOFs)-mediated synthesis strategy. The influence of MOFs pyrolysis on the structure and Fischer-Tropsch synthesis performance of supported cobalt catalysts was investigated. The crystalline phase and microstructure of supported cobalt catalysts were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), N₂ adsorption-desorption and X-ray photoelectron spectroscopy (XPS). The Co/ZnZrO₂ showed the CO conversion of 18.1% and the C₅₊ selectivity of 77.4%, whereas the Co@C-ZnZrO₂ exhibited the CO conversion of 8.5% and the C₅₊ selectivity of 35.2%. The excellent CO conversion for Co/ZnZrO₂ was attributed to the more exposure of active Co sites. Meanwhile, the activity of Co sites on Co@C-ZnZrO₂ catalyst was restricted by the carbon layer, suppressing the adsorption and activation of syngas on Co sites.

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预处理条件对金属-有机骨架负载型钴催化剂结构和催化性能的影响

通过金属有机骨架(MOFs)介导合成策略制备了负载型钴催化剂(Co@C-ZnZrO2和Co/ZnZrO2)。研究了MOFs热解对负载型钴催化剂结构和费托合成性能的影响。采用粉末x射线衍射(XRD)、透射电镜(TEM)、高分辨率透射电镜(HRTEM)、N2吸附-解吸和x射线光电子能谱(XPS)对负载型钴催化剂的晶相和微观结构进行了表征。Co/ZnZrO2的Co转化率为18.1%，C5+选择性为77.4%，而Co@C-ZnZrO2的Co转化率为8.5%，C5+选择性为35.2%。CO /ZnZrO2的良好CO转化归因于更多的活性CO位点的暴露。同时，Co@C-ZnZrO2催化剂上Co位点的活性受到碳层的限制，抑制了合成气在Co位点上的吸附和活化。

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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.