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MgO助剂对甲烷部分氧化Ni/Al2O3催化剂结构和性能的影响
引用本文:邱业君,陈吉祥,张继炎.MgO助剂对甲烷部分氧化Ni/Al2O3催化剂结构和性能的影响[J].燃料化学学报,2006,34(4):450-455.
作者姓名:邱业君  陈吉祥  张继炎
作者单位:天津大学化工学院催化科学与工程系,天津,300072
摘    要:采用分步浸渍法制备了MgO改性的Ni/Al2O3催化剂,采用BET、XRD、H2-TPR、TEM和活性评价等研究方法,考察了MgO助剂对Ni/Al2O3催化剂物化性质和甲烷部分氧化制合成气反应性能的影响。实验结果表明,MgO助剂提高了催化剂镍物种的均一性,抑制了NiAl2O4尖晶石的形成,并且增强了镍物种与载体的相互作用,这与MgO、NiO形成固溶体及与Al2O3形成MgAl2O4有关。同时,适量的MgO助剂可以提高Ni物种在催化剂中分散度,并提高其有效利用率,改性后的催化剂在甲烷部分氧化反应中显示出较好的反应性能。过量的MgO助剂对催化剂的反应性能产生负面影响,MgO的碱性可以促进逆水煤气变换反应,从而导致H2选择性降低和CO选择性提高。

关 键 词:Ni/Al2O3催化剂  氧化镁  甲烷部分氧化  合成气
文章编号:0253-2409(2006)04-0450-06
收稿时间:2005-11-03
修稿时间:2006-04-11

Effects of MgO promoter on properties of Ni/Al2O3 Catalysts for partial oxidation of methane to syngas
QIU Ye-jun,CHEN Ji-xiang,ZHANG Ji-yan.Effects of MgO promoter on properties of Ni/Al2O3 Catalysts for partial oxidation of methane to syngas[J].Journal of Fuel Chemistry and Technology,2006,34(4):450-455.
Authors:QIU Ye-jun  CHEN Ji-xiang  ZHANG Ji-yan
Institution:Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Abstract:The effects of MgO promoter on the physico-chemical properties and the catalytic performance of Ni/ Al2O3 catalysts for partial oxidation of methane to syngas were studied by BET, XRD, HE-TPR, TEM and reaction activity evaluation. It was found that MgO promoter benefited to the uniformity of nickel species on the catalysts, inhibited the formation of NiAl2O4 spinel and improved the interaction between nickel species and the support. This result was related to the formation of NiO-MgO solid solution and MgAl2O4 spinel. Moreover, for the catalysts with proper amount of MgO promoter, the dispersion of nickel species was enhanced, and thus their catalytic performance for methane partial oxidation to syngas was improved. However, excessive MgO promoter exerted a negative effect on the catalyst performance. In addition, the basicity of MgO promoted the reverse watergas shift reaction, which led to the increase of CO selectivity and the decrease of HE selectivity. The suitable content of MgO promoter in Ni/Al2O3 catalyst was about 7%.
Keywords:Ni/Al2O3 catalyst  magnesium oxide  partial oxidation of methane  syngas
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