摘要
采用完全液相法制备了Ti/Si比不同的一系列CuZnTiSi催化剂,运用X射线粉末衍射,N_2吸附解吸,H_2程序升温还原和NH_3程序升温脱附等方法对催化剂进行了表征,并将催化剂用于浆态床CO加氢催化反应中,考察了钛硅比对催化剂结构和性能的影响。结果表明,催化剂中Ti和Si组分均以无定形或高度分散的形式存在;改变Ti/Si比会直接影响Cu物种与Ti、Si组分间的相互作用强弱,从而改变其还原性能;同时,Ti/Si比改变会影响催化剂的孔结构、表面积和表面酸量,最终影响催化活性和产物分布。n(Ti)/n(Ti+Si)=0.5时,Cu物种与Ti、Si组分间的相互作用较弱,催化活性最低。
A series of CuZnTiSi catalysts with different Ti/Si ratios were prepared by complete liquid-phase method and characterized by XRD, N2 adsorption-desorption, H2-TPR and NH3-TPD. The catalysts were used for catalytic hydrogenation of CO in the slurry bed, and the effects of Ti/Si ratio on the structure of the catalysts and their catalytic performance were investigated. The results indicate that the Ti and Si components in the catalyst are in the amorphous or highly dispersed forms. The Ti/Si ratio directly affects the interaction between the Cu species and the Ti and Si components, which changes reduction property of catalysts. Meanwhile, with the change of Ti/Si ratio, the pore structure, surface area and surface acid content of the catalyst change correspondingly. These changes ultimately affect the catalytic activity and product distribution. When the n（Ti）/n（Ti＋Si） is 1, the inte- raction between Cu species and Ti and Si components is weak as well as the catalytic activity is the lowest.
出处
《天然气化工—C1化学与化工》
CSCD
北大核心
2017年第6期34-38,共5页
Natural Gas Chemical Industry
基金
国家自然科学基金(21336006)
