Co基双金属催化剂催化合气转化制备乙醇和高级醇-化学工程与技术专业毕业论文.docx

北京化工大学硕士研究生学位论文2．利用水滑石层板的“网阱’’效应，在T-A1203小球上原位生长 北京化工大学硕士研究生学位论文 2．利用水滑石层板的“网阱’’效应，在T-A1203小球上原位生长 的CoZnGaAl．LDHs，经高温拓扑转变制得ZnAl氧化物负载的CoGa 催化剂CoGa-ZnAl．LDO／T．A1203，得到的CoGa颗粒高度均匀的分散 并嵌于ZnAl氧化物载体上。应用于合成气转化制备乙醇和高级醇， 表现出优异的活性、选择性以及稳定性。通过对比传统浸渍法制备的 CoGa催化剂，得出Co和Ga的均分布结构有效地提高催化性能。进 一步通过分析不同Co／Ga比例的CoGa-ZnAl．LDO／T-A1203催化剂中 Co和Ga的相互作用和催化性能，探究CoGa催化剂的协同机理。 关键词：CoCu催化剂，CoGa催化剂，乙醇和高级醇，合成气转化， 均分散，层状前驱体，“网阱”效应 Ⅱ 万方数据 ABSTRACTCo．BASED ABSTRACT Co．BASED BIMETALLIC CATALYST FoR SYNTHESIS 0F ETHANOL AND HIGHER ALCoHOLS FROM SYNGAS ABSTRACT Synthesis of ethanol and higher alcohols from syngas is one of the major subj ects in C 1 chemistry field．Ethanol and higher alcohols used as liquefaction fuels and／or feedstocks for chemicals could be of great significance if they could be be efficiently synthesized from the transformation of the biomass-based syngas．For the fact that Co has prominent chain growth ability and lower activity towards water-gas shift(WGS)，Co—based catalysts have been attracting renewed scientific interest．However,sole Co site encounters low selectivity towards alcohols due to the deficiency of CO non．dissociation sites．Therefore，another centre on which CO adsorption is associative rather than dissociative is needed to be introduced and cooperates with Coo to yield ethanol and higher alcohols．This work is focused on both of III 万方数据 北京化工大学硕士研究生学位论文the 北京化工大学硕士研究生学位论文 the structure and catalytic performance of the uniformly distributed CoCu catalyst and novel CoGa catalyst． (1)As the metal cations in the layer distributed in atom scale and ion inter the layer dispersed orderly as well as the controlled component，the CoCuZnAl-C03一LDHsLDHs and CoZnAI—Cu(C204)2-·LDHs are synthesized as precursors． By the reduction of the as-synthesised LDHs， CoCu(intercalated)一ZnAl204 and CoCu(1ayered)一ZnAl204 are produced．It is found that the CoCu catalysts derived from LDHs show a better uniformly distributed structure of Co and Cu compared with CoCu／ZnAl204 prepared by impregnation me