Crystalline molecular sieves and their synthesis

Details Crystalline molecular sieves and their synthesis Crystalline molecular sieves and their synthesis

C - Chemistry, Metallurgy

01

B

252/3, 260/675

C01B 33/28 (1985.01) B01J 29/28 (1985.01)

Patent

CA 1251434

CRYSTALLINE MOLECULAR SIEVES AND THEIR SYNTHESIS ABSTRACT A synthetic crystalline siliceous molecular sieve material has the structure of zeolite ZSM-5, zeolite ZSM-11 or zeolite ZSM-12 and contains aluminum and at least two elements selected from the group consisting of boron, gallium and iron in its anionic framework. The crystalline material has a composition on an anhydrous basis and in terms of moles of oxides per mole of silica expressed the the formula: a R2/nO : b Fe2O3 : c B2O3 : d Ga2O3 : e A12O3 : SiO2 wherein R is at least one cation having the valence n, and a = (1.0?0.2)(bfc+d+e) b = 0 to 0.05 c = 0 to 0.05 d = 0 to 0.05 e = 0.00003 to 0.02 b+c+d+e = 0.005 to 0.05 b+c+d ? 0.00047 and wherein only one of b, c and d can be O. When in the ammonium form, the crystalline material has a TPAD (temperature programmed ammonia desorption) peak of from greater than 300°C to less than 390°C and a TPAD half-height width from greater than 135°C to less than 155°C.

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