双功能催化剂中分子筛组分的结构对合成气转化过程中甲烷选择性的影响  

Effect of Structure of Molecular Sieve Component in Bifunctional Catalysts on Methane Selectivity in Syngas Conversion

作　　者：梁耀镇 吕帅[1] 张煜华[1] 王立[1] 李金林[1] LIANG Yaozhen;LV Shuai;ZHANG Yuhua;WANG Li;LI Jinlin(Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,Hubei Key Laboratory of Catalysis and Materials Science,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学催化转化与能源材料化学教育部重点实验室催化材料科学湖北省重点实验室,湖北武汉430074

出　　处：《化学与生物工程》2022年第8期16-20,共5页Chemistry & Bioengineering

基　　金：国家自然科学基金面上项目(21972170)。

摘　　要：利用氧化物-分子筛双功能催化剂能够高效催化CO加氢转化为各类高附加值化学品,氧化物组分与分子筛组分之间的空间距离对产物选择性至关重要,当空间距离较近时会促进甲烷的生成.以CoMn催化剂为氧化物组分,与不同分子筛分别进行物理混合,设计了一系列模型双功能催化剂,考察了双功能催化剂中分子筛组分的结构对合成气转化过程中甲烷选择性的影响.结果表明,与CoMn催化剂相比,双功能催化剂中分子筛组分的Al物种是提高甲烷选择性的根本原因,Al物种能够促进H_(2)的解离,当与CoMn催化剂接触时会促进CH_(x)物种的加氢,提高甲烷选择性.CO hydrogenation can be efficiently converted to high-value chemicals by using oxide-molecular sieve bifunctional catalysts.The space distance between oxide component and molecular sieve component is crucial for product selectivity.When the space distance is close,the formation of methane will be facilitated.In this paper,using CoMn catalyst as the oxide component,we designed a series of model bifunctional catalysts by physical mixing of CoMn catalyst and different molecular sieves.Moreover,we investigated the effect of structure of molecular sieve component in the bifunctional catalysts on methane selectivity in syngas conversion.The results show that,compared with the CoMn catalyst,the Al species in molecular sieve component in the bifunctional catalysts is the fundamental reason for improving the methane selectivity.The Al species can promote the dissociation of H_(2) and promote the hydrogenation of CH_(x) species when contacting with CoMn catalyst,thus improving methane selectivity.

关 键 词：氧化物-分子筛 双功能催化剂 合成气转化 甲烷选择性 

分 类 号：TQ426[化学工程] O643[理学—物理化学]