酸处理对H-丝光沸石结构及其催化异构性能的影响  

Effect of acid treatment on structure of H-mordenite and its catalytic performance in isomerization

作　　者：王雪源[1,2] 黄德奇[2] 岳金方 罗志臣[2] 王元有[2] 张瑞云[2] 曾韬[1] WANG Xue-yuan;HUANG De-qi;YUE Jin-fang;LUO Zhi-chen;WANG Yuan-you;ZHANG Rui-yun;ZENG Tao(College of Chemical Engineering,Nanjing Forestry University,Nanjing 210037,China;School of Chemical Engineering,Yangzhou Polytechnic Institute,Yangzhou 225127,China)

机构地区：[1]南京林业大学化学工程学院,江苏南京210037 [2]扬州工业职业技术学院化学工程学院,江苏扬州225127

出　　处：《现代化工》2020年第4期124-128,共5页Modern Chemical Industry

基　　金：江苏省高等学校自然科学研究面上项目(17KJB150046)。

摘　　要：采用不同浓度的HCl处理H-丝光沸石,研究酸处理对H-丝光沸石结构及其催化异构性能的影响。通过XRD、N2吸附-脱附表征手段考察HCl处理后H-丝光沸石结晶度、比表面积、孔容的变化;利用Py-IR测定了经酸处理后沸石B/L酸的变化;通过α-蒎烯催化异构实验考察经HCl处理后H-丝光沸石的催化异构性能。结果表明,HCl热处理对H-丝光沸石比表面积有明显的影响,且增大了丝光沸石的微孔和介孔孔容;HCl热处理使H-丝光沸石含有的Br?nsted酸和Lewis酸中心数量大幅增加;经HCl处理后H-丝光沸石催化α-蒎烯的转化率下降幅度为12. 7%~37. 8%,但苧烯选择性大幅提高22. 7%~30. 2%,莰烯选择性不变。The effects of acid treatment on the structure and catalytic isomerization performance of H-mordenite are studied by treating H-mordenite with different concentrations of HCl. Changes of crystallinity,specific surface area and pore volume of H-mordenite after HCl treatment are revealed by means of XRD and N2 adsorption-desorption characterization.Variations of B/L acid amount in H-mordenite after HCl treatment are determined by Py-IR,and the catalytic performance is investigated through the isomerization of α-pinene. It is shown that HCl heat treatment has a significant effect on the specific surface area of H-mordenite,which can also increase the microporous and mesoporous pore volume of H-mordenit,and result in a significant increase in the number of Br?nsted and Lewis acid centers of Hmordenit.The conversion rate of α-pinene over H-mordenite after HCl treatment decreases 12. 7%-37. 8% than that over untreated one,but the selectivity of limonene increases dramatically by 22. 7%-30. 2% and that of camphene remains unchanged.

关 键 词：酸处理 H-丝光沸石 沸石结构 催化异构 

分 类 号：TQ35[化学工程]