还原温度对Co-La-Zr/AC催化剂合成气制高碳混合醇性能的影响  

Effect of the Reduction Temperature of Co-La-Zr/AC on the Synthesis of Higher Alcohols from Syngas

作　　者：焦桂萍[1,2] 丁云杰[1,3] 朱何俊[1] 李显明[1,2] 董文达[1,2] 李经伟[1,2] 吕元[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院研究生院,北京100049 [3]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2009年第2期92-94,共3页

基　　金：国家重点基础研究发展计划(973计划;2005CB221403)

摘　　要：采用共浸渍法制备了Co-La-Zr/AC催化剂并考察了不同温度还原的催化剂的CO加氢催化性能.结果表明,在3.0MPa,495K,H2/CO(V/V)=2和GHSV=500h-1条件下,经703K还原的催化剂,CO的转化率和醇的选择性分别为59.1%和42.0%,其中C6～C18的高碳醇在总醇中占到50.4%.XRD结果显示,反应后催化剂的主要物相为金属态的钴和碳化钴(Co2C).还原温度可影响催化剂中钴的晶粒分散度和碳化钴的生成.碳化钴的形成可能在合成气生成醇类的反应中起重要作用.CO hydrogenation over a Co-La-Zr/AC catalyst prepared by co-impregnation and reduced at different temperatures was studied. The catalyst reduced at 703 K showed good activity at 3.0 MPa, 495 K, H2/CO（V/V） = 2, and GHSV = 500 h 1. CO conversion and selectivity for total alcohols were 59.1% and 42.0 % , respectively, and C6 -C18 higher alcohols were 50.4 % of the alcohols. Metallic cobalt and cobalt carbide were detected by XRD as the main cobalt species. The reduction temperature affects both the cobalt dispersion and formation of cobalt carbide. Cobalt carbide may play an important role in the synthesis of higher alcohols on Co-La-Zr/AC.

关 键 词：钴催化剂 FT合成 还原温度 高碳醇 碳化钴 

分 类 号：TQ223.1[化学工程—有机化工]