硅溶胶对二甲醚Si-Al基催化剂性能的影响  

Effect of Different Type Silica Sol on the Performance of Si-Al Based Catalysts for Dimethyl Ether Synthesis in a Slurry Reactor

作　　者：孙凯[1] 赵志换[1] 唐钰[1] 黄伟[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,太原030024

出　　处：《太原理工大学学报》2015年第5期508-513,519,共7页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金重点项目:合成气高效转化集成工艺及其关键科学与技术问题的研究(21336006);国家自然科学基金面上项目(21176176);高等学校博士学科点专项(优先发展领域)(20111402130002)

摘　　要：将不同型号硅溶胶用于完全液相法制备Si-Al基一步法二甲醚催化剂,运用红外光谱分析(FTIR),X射线衍射(XRD),氢气程序升温还原(H2-TPR)以及氮气吸附等手段对这些催化剂进行了表征与分析。催化剂性能评价结果表明,Si的加入显著提高了催化剂的活性及二甲醚选择性;碱性硅溶胶更有利于催化剂稳定性的提高,以JN-30型号硅溶胶为硅源所制的催化剂具有最高的CO转化率和二甲醚选择性。研究认为,碱性硅溶胶催化剂各组分之间的作用力强、可还原的Cu物种多是催化剂稳定性好的原因。The catalysts in this paper were prepared by a complete liquid‐phase technology u‐sing different types of silica sols and their catalytic performances were evaluated in a slurry reac‐tor and characterized with FTIR ,XRD ,H2‐TPR and N2 adsorption .It is found that the addition of silica element can markedly increase the catalytic activity and the selectivity of dimethyl ether （DME） ,and alkaline silica sols are more helpful to the stability of the catalyst .The catalyst pre‐pared with JN‐30 silica sol has highest CO conversion and DME selectivity .It is concluded that the catalysts prepared with alkaline silica sols have stronger interaction among their components and the more Cu＋ species contribute to the good catalyst stability .

关 键 词：完全液相法 二甲醚 Si-Al基催化剂 硅溶胶 

分 类 号：O643[理学—物理化学]