摘要
以柠檬酸(CA)为络合剂,采用溶胶-凝胶法制备了K/Fe/β-Mo2C催化剂前驱体,将该前驱体在Ar气氛下程序升温碳化制备了纳米尺寸的K/Fe/β-Mo2C催化剂。考察了K含量对K/Fe/β-Mo2C催化剂织构及CO加氢反应性能的影响。结果表明,K助剂的引入促进了催化剂中β-Mo2C晶粒的长大,适量的K提高了催化剂的比表面积,提高了催化剂的活性和低碳醇选择性,但是过量K助剂的引入在催化剂表面形成了惰性的K2MoO4和K2Mo2O7,覆盖了部分活性中心,降低了催化剂的活性和低碳醇选择性。
A series of nano-sized K/Fe/β-Mo2C catalysts were prepared by a modified sol-gel method followed by a temperature-programmed carburization process under argon flow. The effects of K on the texture properties, structure and catalytic performance of the catalysts were investigated. The results showed that the introduction of K increased β-Mo2C particle size of the catalysts, and the addition of proper content of K could improve the surface area, the CO hydrogenation activity and the selectivity to higher alcohols of the catalysts. However, when excessive K was added, the inert K2MoO4 and/or K2Mo2O7 would be formed on the surface of the catalysts, which resulted in that part of the active species were covered and the catalytic activity and selectivity of higher alcohols were decreased.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2014年第3期25-29,共5页
Natural Gas Chemical Industry
基金
国家自然科学基金重大项目(20590363)
