硅源对浆态床合成二甲醚Cu-Zn-Si-Al催化剂性能的影响  

Effect of different silica sources on catalytic performance of Cu-Zn-Si-Al catalyst for dimethyl ether synthesis in slurry reactor

作　　者：孙凯[1] 唐钰[1] 韩涛[1] 张强[1] 边仲凯 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,山西太原030024

出　　处：《天然气化工—C1化学与化工》2016年第3期52-57,共6页Natural Gas Chemical Industry

基　　金：国家自然科学基金重点项目(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：采用分步沉淀法,分别以TEOS(正硅酸乙酯)和硅溶胶为硅源制备了Cu-Zn-Si-Al双功能浆状催化剂。用XRD、H_2-TPR、XPS、NH_3-TPD-MS、元素分析等方法对催化剂进行了表征。结果表明,不同硅源对于催化剂性能有较大影响。以TEOS为原料制备的催化剂具有相对较高的催化活性,但稳定性较差。以硅溶胶为原料制备的催化剂活性稍差,但稳定性较好。分析认为催化剂活性组分的分散性及其中弱酸量的多少是影响其活性的主要因素,而活性组分中Cu^0/Cu^+比对于催化剂的稳定性起主要影响。另外,此催化剂并未出现文献中报道的明显的Cu流失现象。Cu-Zn-Si-Al bi-functional catalysts were prepared by step-by-step precipitation method with TEOS and silica sol as silica source, respectively, and characterized by XRD, TPR, XPS, NH3-TPD-MS and elemental analysis. The results indicate that dif-ferent silica sources affected the catalyst performance obviously. The catalyst prepared with TEOS as silica source showed higher ac-tivity than the one prepared with silica sol as silica source, however, the latter showed higher stability in the reaction than the former. It is concluded that the dispersibility and the weak acid sites of the catalyst have great effect on it ’s activity, and the ratio of Cu＋/Cu of the active components has major impact on the stability of the catalyst. In addition, no obvious loss of Cu was observed in the re-action.

关 键 词：浆态床 二甲醚 合成 Cu-Zn-Si-Al催化剂 硅源 

分 类 号：O643.3[理学—物理化学] TQ426[理学—化学]