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yihanfan金虫 (小有名气)
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ZSM-5如何制备HZSM-5
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ZSM-5如何制备HZSM-5？ 想请教一下，是否将ZSM-5浸渍于铵离子溶液中可以将其转变为HZSM-5. |
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给你个文献, Applied Catalysis A: General 185 (1999) 41–52 ZSM-5 zeolite with enhanced acidic properties R. Le Van Mao , T.S. Le, M. Fairbairn, A. Muntasar, S. Xiao, G. Denes Concordia University, Department of Chemistry and Biochemistry and Laboratories for Inorganic Materials, 1455 De Maisonneuve West, Montreal, Que. H3G 1M8, Canada Received 27 January 1999; accepted 31 March 1999 Abstract ZSM-5 zeolite, when doped with fluorine species in relatively low concentration using ammonium fluoride as precursor, and subsequently activated stepwise at high temperature, shows an enhanced surface acidity because of: (i) the formation of new Bronsted acid sites; and (ii) the strengthening of some acid sites of the parent zeolite. This is ascribed to the proton attack of the zeolite surface by the chemisorbed HCF− ion pair. Under these preparation conditions, the zeolite structure is fully preserved. Such enhanced acid properties are traduced by a significant increase in the yield of methyl tert-butyl ether (gas phase reaction). ©1999 Elsevier Science B.V. All rights reserved. Keywords: ZSM-5 zeolite; Mild doping with F and subsequent stepwise activation at high temperature; Enhanced acidic properties; Enhanced activity in the MTBE synthesis 1. Introduction 2. Experimental 2.1. Catalyst preparation (i) The acid form of the H-ZSM5 was prepared by repeated ion exchange of the commercially available Na-ZSM5 zeolite (Zeocat PZ 2/30, Na form, powder, Chemie Uetikon, Switzerland) with a 10 wt.% solution of ammonium chloride at 80C with stirring. Each treatment lasted for 1 h, after which the used solution was decanted and fresh solution added (1 g of zeolite in 10 ml solution). The procedure was repeated 4–5 times, after which the solid was washed on the filter several times with water and dried at 120C. The acid form was generated by activation at 450C in air overnight. The final catalyst (extrudates), hereafter referred to as H-ZSM5, was obtained |
4楼2008-05-26 09:13:59
