Citation: Tie Hong CHEN, Ping Chuan SUN, Ai Ju MEN, Zhong Yong YUAN, Zhen Ya GUO, Jing Zhong WANG, Da Tong DING, He Xuan LI. LEWIS ACIDIC SITES NOT ASSOCIATED WITH EXTRA-FRAMEWORK ALUMINUM IN DEHYDROXYLATED ZEOLITE HZSM-5[J]. Chinese Chemical Letters, ;1996, 7(5): 491-492. shu

LEWIS ACIDIC SITES NOT ASSOCIATED WITH EXTRA-FRAMEWORK ALUMINUM IN DEHYDROXYLATED ZEOLITE HZSM-5

a Department of Chemistry, Nankai University, Tianjin, 300071;
b The State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation, Nankai University Tianjin,300071;
c Department of Physics, Nankai University, Tianjin, 300071

Received Date: 15 November 1995

Fund Project: This work was supported by the State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation, Nankai University.

Zeolite HZSM-5 calcined at different temperatures were studied by²⁹Si MAS NMR and EPR methods.It was concluded that in certain temperature range,dealumination did not necessarily occur simultaneously with framework dehydroxylation and thus framework Lewis acidic sites emerged.Two processes may be operative with one of them being predominant at different temperatures.
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