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Catalytic performance of Ni-Fe/γ-Al2O3 catalyst prepared from different nickel precursors for CO methanation

ZHONG Pengzhan1,MENG Fanhui1,CUI Xiaoxi1,2,LIU Jun1,LI Zhong1   

  1. 1Key Laboratory of Coal Science and Technology,Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;2 Center of Technology,Saidin Engineering Company Limited, Taiyuan,030024,Shanxi,China
  • Online:2013-08-05 Published:2013-08-05

镍盐前体对Ni-Fe/γ-Al2O3催化剂甲烷化性能的影响

钟朋展1,孟凡会1,崔晓曦1,2,刘 军1,李 忠1   

  1. 1太原理工大学煤科学与技术国家重点实验室培育基地,山西 太原030024;2赛鼎工程有限公司技术中心, 山西 太原 030024

Abstract: Bimetallic Ni-Fe/γ-Al2O3 catalysts were prepared from different nickel precursors of Ni(NO3)2,Ni(CH3CO2)2 and NiCl2 (denoted as Ni-Fe-N,Ni-Fe-Ac,Ni-Fe-Cl,respectively) by the impregnation method. The catalysts for CO methanation in a slurry-bed reactor were investigated using XRD,CO-TPD and H2-TPR. Ni-Fe-N showed maximal catalytic activity for CO methanation,with CO conversion of 97.2% and CH4 selectivity of 87.3%,while Ni-Fe-Cl showed a minimum activity with CO conversion of 47.3% and CH4 selectivity of 58.7%. The higher activity of Ni-Fe-N was attributed to high dispersion of NiO,interaction between Ni and Fe in bimetallic catalyst and high adsorption capacity for CO.

Key words: precursor, slurry-bed, CO methanation, bimetallic Ni-Fe catalyst

摘要: 以3种不同镍盐(硝酸镍、乙酸镍和氯化镍)为前体,采用等体积浸渍法制备了双金属Ni-Fe/γ-Al2O3催化剂,分别记作Ni-Fe-N、Ni-Fe-Ac和Ni-Fe-Cl,在浆态床反应装置上对各催化剂CO甲烷化催化活性进行评价。结果表明,Ni-Fe-N甲烷化催化活性最高,CO转化率、CH4选择性分别为97.2%和87.3%;而Ni-Fe-Cl甲烷化催化活性最低,CO转化率、CH4选择性分别为47.3%和58.7%。通过XRD、H2-TPR和CO-TPD等表征技术探讨了催化剂的微观结构与甲烷化催化活性之间的关系,发现Ni-Fe-N甲烷化活性高的原因是NiO晶粒小、分散好,Ni与Fe之间具有较好的协同作用,并且CO吸附量大。

关键词: 前体, 浆态床, CO甲烷化, 镍铁双金属催化剂

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