Synthesis of B-ZSM-5 Zeolites in Slightly Acidic Medium

Abstract

Abstract: B-ZSM-5 type molecular sieve was synthesized by hydrothermal crystallization at 150-200℃ from mixture containing NH₄F and tetrapropyl-ammonium bromide (TPABr) as template. pHvalues were 5~7. Because of the lack of alkaline metal hydroxide, NH₄-form precursors were obtained and H-form B-ZSM-5 was directly yielded after calcination. After adsorption of pyridin the IRspectra showed the presence of both Lewis and Bronsted acid sites. SEManalysis indicated that the formation of large B-ZSM-5 crystals and its growth were pe'r-fect. Si substitution by Bled to a decrease of crystal size and of the length/width ratio. XRD, IR, XPS, DTAstudies on B-ZSM-5 proved that boron atom did situate in ZSM-5 framework.

Key words: Zeolite, ZSM-5, Boron

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Qiu Shilun, Pang Wenqin, Zhao Daqing . Synthesis of B-ZSM-5 Zeolites in Slightly Acidic Medium[J]. Chem. J. Chinese Universities, 1988, 9(10): 987.

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Synthesis of B-ZSM-5 Zeolites in Slightly Acidic Medium

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