Introduction of mesoporosity into zeolite materials with sequential acid, surfactant, and base treatment

摘要

Compositions and methods for introducing mesoporosity into zeolitic materials employing sequential acid, surfactant, and base treatments are disclosed herein. Mesopores can be introduced into zeolitic materials, such as zeolites, by treatment with an acid and surfactant followed by treatment with a base. The resulting mesoporous zeolitic materials can have a total 20 to 135 Å diameter mesopore volume of at least 0.05 cc/g. Additionally, the resulting mesoporous zeolitic materials can have a total 0 to 20 Å micropore volume of at least 0.10 cc/g.

主权项

1. A method of forming a material comprising a mesoporous zeolitic material having long-range crystallinity, said method comprising:
(a) contacting an initial zeolitic material having long-range crystallinity with an acid to thereby form an acid-treated zeolitic material having long-range crystallinity, wherein said initial zeolitic material comprises zeolite A, faujasites, mordenite, CHA, ZSM-5, ZSM-12, ZSM-22, beta zeolite, synthetic ferrierite, synthetic mordenite, or mixtures thereof; (b) contacting said acid-treated zeolitic material having long-range crystallinity with a surfactant to thereby form a first treatment mixture comprising said surfactant and an intermediate surfactant-treated material; (c) recovering at least a portion of said intermediate surfactant-treated material from said first treatment mixture thereby forming an at least partially isolated intermediate surfactant-treated material; and (d) contacting said at least partially isolated intermediate surfactant-treated material with a base thereby forming said mesoporous zeolitic material having long-range crystallinity.