费托合成制低碳烯烃中碱金属对CoMn催化剂催化性能的影响

杨若欧; 孙凡飞; 赵子昂; 赵景泰; 姜政

doi:10.11889/j.0253-3219.2018.hjs.41.100102

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费托合成制低碳烯烃中碱金属对CoMn催化剂催化性能的影响

同步辐射技术及应用 | 更新时间：2021-05-19

- 费托合成制低碳烯烃中碱金属对CoMn催化剂催化性能的影响
- Effects of alkalis on the catalytic performance of CoMn catalysts for Fischer-Tropsch to olefin reactions
- 核技术 2018年41卷第10期文章编号：100102
- 作者机构：
  
  1.上海大学材料科学与工程学院上海 201900
  2.中国科学院上海应用物理研究所张江园区上海 201204
  3.中国科学院大连化学物理研究所清洁能源国家实验室大连 116023
- 作者简介：
  
  [ "杨若欧, 男, 1992年出生, 2015年毕业于浙江工业大学, 现为硕士研究生, 材料物理与化学专业", "YANG Ruoou, male, born in 1992, graduated from Zhejiang University of Technology in 2015, master student, major in material physics and chemistry" ]
  姜政, E-mail:jiangzheng@sinap.ac.cn JIANG Zheng, E-mail:jiangzheng@sinap.ac.cn
- 基金信息：
  
  国家自然科学基金联合基金项目(U1732267);国家自然科学基金(91545101)
- DOI：10.11889/j.0253-3219.2018.hjs.41.100102
  中图分类号： TL99
- 收稿日期：2018-04-03，
  
  修回日期：2018-05-12，
  
  纸质出版日期：2018-10-10
- 稿件说明：
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杨若欧, 孙凡飞, 赵子昂, 等. 费托合成制低碳烯烃中碱金属对CoMn催化剂催化性能的影响[J]. 核技术, 2018,41(10):100102

Ruoou YANG, Fanfei SUN, Ziang ZHAO, et al. Effects of alkalis on the catalytic performance of CoMn catalysts for Fischer-Tropsch to olefin reactions[J]. Nuclear techniques, 2018, 41(10): 100102
杨若欧, 孙凡飞, 赵子昂, 等. 费托合成制低碳烯烃中碱金属对CoMn催化剂催化性能的影响[J]. 核技术, 2018,41(10):100102 DOI： 10.11889/j.0253-3219.2018.hjs.41.100102.

Ruoou YANG, Fanfei SUN, Ziang ZHAO, et al. Effects of alkalis on the catalytic performance of CoMn catalysts for Fischer-Tropsch to olefin reactions[J]. Nuclear techniques, 2018, 41(10): 100102 DOI： 10.11889/j.0253-3219.2018.hjs.41.100102.

摘要

碳化钴（Co

C）在费托合成制低碳烯烃（Fischer-Tropsch to Olefin，FTO）中起着重要的催化作用。通过X射线衍射（X-ray Diffraction，XRD）、X射线吸收精细结构（X-ray Absorption Fine Structure，XAFS）等表征与方法，对碱金属在CoMn催化FTO中形成碳化钴的影响进行了研究。在钠（Na）、钾（K）元素的影响下，CoMn催化剂在活性评测中，低碳非饱和烃与低碳饱和烃的比例高达17.4与9.4，且仅有较低的甲烷（CH

）产生，而锂（Li）对CoMn催化剂的选择性影响较弱。通过XRD表征，发现Na、K对CoMn催化剂形成Co

C有很好的促进效果。XAFS揭示了CoMn催化剂的电子结构，催化反应后形成碳化钴的配位结构，为研究CoMn催化剂微观结构提供了基础理论。

Abstract

Background

Cobalt carbide (Co

C) has recently been reported to catalyze the Fischer-Tropsch to olefin (FTO) conversion of syngas with high selectivity. However

electronic state and coordination structure of cobalt carbide is limited by its complex reaction.

Purpose

This study aims to clarify the effect of alkalis of CoMn catalysts for FTO and understanding the atomic structure of cobalt carbide nanoparticles in the CoMn catalyst.

Methods

X-ray absorption fine structure (XAFS) experimental on beamline (BL14W1) of XAFS spectroscopy at the Shanghai Synchrotron Radiation Facility (SSRF) is conducted to explore the electronic state and coordination structure of cobalt carbide with the effects of alkalis.

Results

X-ray absorption near-edge structures (XANES) spectra indicts that Na

K acted as electronic donors to cobalt than Li. EXAFS spectra clarified show that the atomic structure of cobalt carbide nanoparticles.

Conclusion

The Na

K promoter had benefited the formation of the cobalt carbide in the evolution of the FTO catalysts.

关键词

Keywords

references

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