氧化镁对钴钼基高温变换催化剂性能的影响  

Effect of magnesium oxide on the performance of high temperature Co-Mo based water gas shift catalyst

作　　者：邓甜音 田大勇 赵华博 蒋明哲 孙守理 

机构地区：[1]北京低碳清洁能源研究所,北京102209

出　　处：《能源化工》2017年第1期6-9,共4页Energy Chemical Industry

基　　金：神华集团项目基金(ST930015SH06)

摘　　要：采用混捏法制备Co-Mo基高温变换催化剂焙烧过程中,镁源的反应性能对催化剂的性能具有重要的影响。分别采用氧化镁Ⅰ、Ⅱ和Ⅲ为镁源,研究了不同的氧化镁和氧化镁含量对Co-Mo基高温变换催化剂性能的影响。结果表明:氧化镁晶粒尺寸和粒度影响其与拟薄水铝石和偏钛酸的反应性能,晶粒尺寸和粒度越小越有利于形成镁铝尖晶石和镁钛尖晶石,催化剂中残余的游离氧化镁少,从而有利于提高催化剂的稳定性;氧化镁含量影响催化剂的强度和活性,在试验条件下,随着氧化镁含量增加,催化剂的强度提高,活性呈现先增大后基本不变的趋势;当氧化镁质量分数为23%和25%时,催化剂具有较好的强度和活性。以氧化镁Ⅲ为镁源制备的催化剂具有比工业催化剂更高的稳定性。In the calcination process of preparing high temperature Co-Mo based water gas shift catalyst by mixing kneading,the reactivity properties of different magnesium oxide have great impacts on the performance of catalyst.The effect of magnesium oxide kinds and magnesium oxide content on the catalytic performance of high temperature Co-Mo based water gas shift catalyst is studied by using magnesium oxide Ⅰ,Ⅱ and Ⅲ as magnesium resource.The results show that both of the crystallinity and the particle size of magnesium oxide play an important role during magnesium oxide reacting with pseudo bohemite and metatitanic acid,and the smaller crystal particle size is beneficial to form magnesiumaluminate spinel and magnesium titanatespinel,respectively,which leads to less free magnesium oxide remained in catalyst and the stability of the catalyst is improved.The content of magnesium oxide can affect the catalyst strength and activity.Under the test conditions,with the magnesium oxide content increasing,the strength increases,while the catalyst activity first increases and then remains unchanged.The catalyst behaves better strength and activity when the mass fraction of magnesium oxide is 23% or 25%.The catalyst prepared by MgO-Ⅲ shows better stability than industry catalyst.

关 键 词：钴钼催化剂 氧化镁 高温变换 活性 稳定性 抗水合性 强度 

分 类 号：TQ426.94[化学工程]