High temperature calcination of selectivated molecular sieve...

Details High temperature calcination of selectivated molecular sieve... High temperature calcination of selectivated molecular sieve...

B - Operations, Transporting

01

J

B01J 29/06 (2006.01) B01J 29/04 (2006.01) B01J 29/40 (2006.01) B01J 37/08 (2006.01) C07C 5/27 (2006.01)

Patent

CA 2533157

A method is disclosed for modifying a catalytic molecular sieve for shape- selective hydrocarbon conversions comprises: a) selectivating said catalytic molecular sieve by contacting with a silicon containing selectivating agent; and b) calcining the selectivated catalytic molecular sieve at high temperature calcination conditions comprising temperatures greater than 700'C, which conditions are sufficient to reduce acid activity as measured by alpha value and increase diffusion barrier of said catalytic molecular sieve as measured by the rate of 2,3-dimethylbutane uptake, as compared to the selectivated catalyst. Catalytic molecular sieves thus prepared, such as silica-bound ZSM-5, and their use in hydrocarbon conversion processes such as aromatics isomerization, e.g., xylene isomerization, ethylbenzene conversion and aromatics disproportionation, e.g., toluene disproportionation are also disclosed.

Cette invention concerne un procédé de modification d'un tamis moléculaire catalytique pour transformation de forme d'hydrocarbures consistant: a) à rendre sélectif un tamis moléculaire catalytique en le mettant en contact avec un agent de sélectivation renfermant du silicium; et b) à calciner le tamis moléculaire rendu sélectif en conditions de calcination à haute température ( plus de 700·C), conditions suffisantes pour réduire l'activité acide en termes de valeur alpha value et augmenter la barrière de diffusion dudit tamis moléculaire catalytique mesuré au taux de captage de 2,3-diméthylbutane, par comparaison avec le catalyseur rendu sélectif. L'invention concerne des tamis moléculaires ainsi préparés, tels que ZSM-5 à liaison silice, ainsi que leur utilisation dans le cadre de processus de transformation d'hydrocarbures tels qu'isomérisation d'aromatiques, par exemple du xylène, la transformation de l'éthylbenzène et la dismutation d'aromatiques, par exemple du toluène.

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