摘要
金属氧化物-分子筛(OX-ZEO)双功能催化剂可实现CO_(x)加氢制低碳烯烃的高选择性转化。本文概述了OX-ZEO催化CO_(x)加氢制低碳烯烃反应中金属氧化物的研究进展,通过对CO_(x)加氢制甲醇/乙烯反应热力学分析指出了“接力催化”的优势,重点讨论了金属氧化物的种类和组成、制备方法及金属氧化物和分子筛的“亲密度”对催化性能的影响,探讨了催化反应机理、氧空位的作用及抑制副反应的策略。分析了OX-ZEO催化反应面临的问题和挑战,展望了OX-ZEO催化体系的发展趋势,认为通过元素掺杂、助剂修饰、优化制备条件等可提高金属氧化物的氧空位含量,进而可提高催化活性,也可通过对金属氧化物进行表面疏水改性抑制副产物CO_(x),提高C原子利用率。
Metal oxide-zeolite(OX-ZEO)bifunctional catalyst can convert CO_(x)hydrogenation into light olefins with high selectivity.In this work,the progresses of metal oxide in OX-ZEO catalyst for CO_(x)hydrogenation to light olefins are summarized,the advantages of“relay catalysis”are expounded through the thermodynamic analysis of CO_(x)hydrogenation to methanol/ethylene reaction,and the type and composition of metal oxide,OX-ZEO preparation method and the influence of“proximity”between oxide and SAPO-34 are mainly discussed.The catalytic reaction mechanism,the role of oxygen vacancy and the strategy to suppress side reactions are discussed.The problems and challenges of the OX-ZEO catalytic route are analyzed,and the development trend of the OX-ZEO catalytic system is prospected.It is believed that the catalytic activity can be improved by increasing the oxygen vacancies of metal oxides through elemental doping,promoter modification or optimizing preparation conditions,etc.Moreover,the by-product CO_(x)generation can be suppressed by hydrophobic surface modification of the metal oxides to improve the utilization of C atoms.
作者
张鹏
孟凡会
杨贵楠
李忠
ZHANG Peng;MENG Fanhui;YANG Guinan;LI Zhong(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2022年第8期4159-4172,共14页
Chemical Industry and Engineering Progress
基金
山西省自然科学基金(202103021224073)
山西省重点研发计划(国际科技合作)(201803D421011)
国家自然科学基金重点项目(U1510203)。
