Process for preparing a large pore molecular sieve

Details Process for preparing a large pore molecular sieve Process for preparing a large pore molecular sieve

C - Chemistry, Metallurgy

01

B

C01B 39/48 (2006.01) B01J 20/18 (2006.01) B01J 29/04 (2006.01) C01B 37/02 (2006.01) C01B 39/00 (2006.01) C11D 3/12 (2006.01)

Patent

CA 2189865

The present invention relates to a process for the preparation of a large-pore molecular sieve, comprising crystallising the molecular sieve from a starting mixture at a pH in the range of from 3 to 8, and recovering a large-pore molecular sieve, the said starting mixture having a molar composition satisfying the following molar ratios: (0.01 - 2) R2/nO) : (0 - 1.5) M2/mO : (0 - 0.5) X2O3 : 1 YO2 : (5 - 1,000) H2O : (0.01 - 3) F-, wherein n and m are the weighted average valences of R and M respectively, M is an alkali- or alkaline-earth metal, X is a trivalent metal and Y is a tetravalent element, wherein R comprises at least one main organic template Rm having the formula R1R2R3R4Q+ wherein Q is nitrogen or phosphorus and wherein at least one and at most three of R1, R2, R3 and R4 is an aryl or alkyl group having 6 to 36 carbon atoms and each of the remainder of R1, R2, R3 and R4 is selected from hydrogen and an alkyl group having 1 to 5 carbon atoms. The invention further relates to a calcined large-pore molecular sieve and its use.

L'invention concerne un procédé de préparation d'un tamis moléculaire à larges pores, consistant à cristalliser le tamis moléculaire à partir d'un mélange de départ, à un pH compris entre 3 et 8, puis à récupérer un tamis moléculaire à larges pores, le mélange de départ possédant une composition molaire répondant aux rapports molaires suivants: (0,01 - 2) R¿2/n?O) : (0 - 1,5) M¿2/m?O : (0 - 0,5) X¿2?O¿3? : 1 YO¿2? : (5 - 1000) H¿2?O : (0,01 - 3) F?-¿, dans lesquels n et m représentent respectivement les valences moyennes pesées de R et M, M représente un métal alcalin ou alcalino-terreux, X représente un métal trivalent et Y un élément tétravalent, R comprenant au moins une matrice organique R¿m? possédant la formule R¿1?R¿2?R¿3?R¿4?Q?+¿ dans laquelle Q représente azote ou phosphore et dans laquelle au moins un et au plus trois parmi R¿1?, R¿2?, R¿3? et R¿4? représente(nt) un groupe aryle ou alcoyle possédant 6 à 36 atomes de carbone, chacun de ceux restant parmi R¿1?, R¿2?, R¿3? et R¿4? étant choisi parmi hydrogène et un groupe alcoyle possédant 1 à 5 atomes de carbone. L'invention concerne en outre un tamis moléculaire calciné à larges pores, ainsi que l'utilisation de celui-ci.

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