Effect of acid treatment on structure of H-mordenite and its catalytic performance in isomerization
WANG Xue-yuan1,2, HUANG De-qi2, YUE Jin-fang2, LUO Zhi-chen2, WANG Yuan-you2, ZHANG Rui-yun2, ZENG Tao1
1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China; 2. School of Chemical Engineering, Yangzhou Polytechnic Institute, Yangzhou 225127, China
Abstract: 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 H-mordenit.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.
王雪源, 黄德奇, 岳金方, 罗志臣, 王元有, 张瑞云, 曾韬. 酸处理对H-丝光沸石结构及其催化异构性能的影响[J]. 现代化工, 2020, 40(4): 124-128.
WANG Xue-yuan, HUANG De-qi, YUE Jin-fang, LUO Zhi-chen, WANG Yuan-you, ZHANG Rui-yun, ZENG Tao. Effect of acid treatment on structure of H-mordenite and its catalytic performance in isomerization. Modern Chemical Industry, 2020, 40(4): 124-128.
[1] Janssen A H,Koster A J,Jong K P D.On the shape of the mesopores in zeolite Y:A three-dimensional transmission electron microscopy study combined with texture analysis[J].Journal of Physical Chemistry B,2002,106(46):11905-11909. [2] Najar H,Zina M S,Ghorbel A.Study of the effect of the acid dealumination on the physico-chemical properties of Y zeolite[J].Reaction Kinetics Mechanisms & Catalysis,2010,100(2):385-398. [3] Agustina E,Theresia P.The effect of acid dealumination of indonesian zeolite on its physical,chemical and catalytic properties[J].Studies in Surface Science & Catalysis,1994,84(10):1021-1026. [4] Broekhoven E H V,Daamen S,Smeink R G,et al.The effect of dealumination procedure on the acidity and catalytic properties of Y zeolites[J].Studies in Surface Science & Catalysis,1989,49(12):1291-1300. [5] Triantafillidis C S,Vlessidis A G,Nalbandian L,et al.Effect of the degree and type of the dealumination method on the structural,compositional and acidic characteristics of H-ZSM-5 zeolites[J].Microporous & Mesoporous Materials,2001,47(2-3):369-38. [6] Weitkamp J,Puppe L.Catalysis and zeolites:Fundamentals and applications[M].Berlin:Springer,1999:226. [7] Soscún H,Castellano O,Hernández J,et al.Acidity of the brönsted acid sites of zeolites[J].International Journal of Quantum Chemistry,2015,82(3):143-150. [8] Bhan A,Iglesia E.A link between reactivity and local structure in acid catalysis on zeolites[J].Cheminform,2008,39(29):559-567.