Preparation of modified MgFeMn-HTLcs and catalytic performance in CO hydrogenation

ZHANG Jianli; WANG Xu; MA Liping; YU Xufei; MA Qingxiang; FAN Subing; ZHAO Tiansheng

doi:10.11949/j.issn.0438-1157.20180019

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Preparation of modified MgFeMn-HTLcs and catalytic performance in CO hydrogenation

更新时间：2025-12-10

- Preparation of modified MgFeMn-HTLcs and catalytic performance in CO hydrogenation
- CIESC Journal Issue 5, Pages: 2073-2080(2018)
- 作者机构：
  
  省部共建煤炭高效利用与绿色化工国家重点实验室(宁夏大学),宁夏,银川,750021
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180019
  CLC： 643
- Online First：05 May 2018，
  
  Published：05 May 2018
- 稿件说明：
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ZHANG Jianli, WANG Xu, MA Liping, et al. Preparation of modified MgFeMn-HTLcs and catalytic performance in CO hydrogenation[J]. CIESC Journal, 2018, (5): 2073-2080.
DOI：

ZHANG Jianli, WANG Xu, MA Liping, et al. Preparation of modified MgFeMn-HTLcs and catalytic performance in CO hydrogenation[J]. CIESC Journal, 2018, (5): 2073-2080. DOI： 10.11949/j.issn.0438-1157.20180019.

摘要

采用沉淀-水热法制备了系列不同Mg/Fe/Mn配比的MgFeMn-HTLcs类水滑石前体，经焙烧、浸渍法K改性用于CO加氢制烯烃反应。采用XRD、SEM、TG、N2吸附-脱附、H2-TPR、XPS等手段对催化剂进行了表征。结果表明，制备的Mg-Fe-Mn前体均具有类水滑石层状结构，Mn的添加使结晶度下降；焙烧后，Mg-Fe样品主要生成MgO，Mg-Fe-Mn样品生成Mg2MnO4、MgO和MgFe2O4物相；反应后主要为MgCO3和FeCO3混合物相，伴随FeO-MnO和FexCy的生成；与K/Mg-Fe样品相比，Mn的加入进一步促进了Fe的分散，使得Fe2O3到Fe3O4还原度增加，其供电子效应促使Fe电子结合能向低偏移。在CO加氢反应中，K/Mg-Fe-Mn催化剂均表现出较高的反应活性和烯烃选择性。其中，K/3Mg-1Fe-2Mn催化剂的效果较好，CH4含量较低，O/P值达5.20，C2=～C4=质量分数为43.03%。

Abstract

A series of MgFeMn-HTLcs (hydrotalcite-like compounds) precursors with different Mg/Fe/Mn molar ratios were prepared by coprecipitation-hydrothermal method

which were then calcined and modified with K impregnation to be used as catalysts for light olefin synthesis from CO hydrogenation. The catalysts were characterized by XRD

SEM

N2 adsorption-desorption

H2-TPR and XPS techniques. The results showed that MgFeMn-HTLcs precursors had typical layered structures of hydrotalcite and reduced crystallinity by Mn addition. After calcination

MgO was only detected from Mg-Fe precursors whereas Mg2MnO4

MgO and MgFe2O4 were co-existed from Mg-Fe-Mn precursors. After CO hydrogenation

main phases were MgCO3 and FeCO3

accompanied by formation of FeO-MnO and little FexCy. Mn addition further promoted Fe dispersion and increased reduction from Fe2O3 to Fe3O4

compared to those of K/Mg-Fe catalysts. With Mn increase and its electron donating effect

binding energies of Fe 2p were shifted to lower values. In CO hydrogenation

all prepared K/Mg-Fe-Mn catalysts showed high activity and C2=-C4= selectivity. O/P value of 5.20 and C2=-C4= fraction of 43.03% were achieved with low methane selectivity over K/3Mg-1Fe-2Mn catalyst.

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