Preparation and Properties of So42--TiO2- Hβ-A2O3Catalyst

Abstract

Abstract: In this paper,So₄^2--TiO₂-Hβ-Al₂O₃solid catalyst was obtained by TiO₂modification and(NH₄)₂SO₄treatment of β zeolite. The effect of calcination temperature on the surface composition, acidity and catalytic behavior was observed by XRD, XPS, NH₃-TPD,FTIR and chemisorption.The following conclusions were obtained:(1)There was a strong interaction between SO₄^2-and TiO₂on the surface of Hβ-Al₂O₃zeolite at suitable calcination temperature, 550℃.High temperature calcination lowered the surface concentration of (2)Compared to Hβ catalyst,the total number of acid sites and acid strength of TiO₂-Hβ-Al₂O₃were increased greatly, and some increasing acid sites were produced.Lacid sites were predomiant in increasing the number of acid sites.(3)The catalyst showed a high activity on the etherification of propylene and isopropanol to isopropyl ether.With comparison to Hβzeolite catalyst, the propylene conversion was increased from 8.0%to 15.9%and mainly took place on Lacid sites.

Key words: &beta, zeolite, SO₄^2--TiO₂, Propylene etherification, Calcination temperature, Increasing acid

TrendMD:

WANG Yan-Ji, TANG jing, LI He-Xuan. Preparation and Properties of So₄^2--TiO₂- Hβ-A₂O₃Catalyst[J]. Chem. J. Chinese Universities, 1995, 16(12): 1930.

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Preparation and Properties of So₄^2--TiO₂- Hβ-A₂O₃Catalyst

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