Molecular sieves and a process for making molecular sieves
AssigneeExxonMobil Research and Engineering Company
InventorsPreeti Kamakoti, Scott J. Weigel, Karl G. Strohmaier, Helge Jaensch, Marc H. Anthonis, Martine Dictus, Brita Engels, Darryl D. Lacy, Sina Sartipi
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Abstract
Processes are provided for preparing molecular sieves. The process involves preparing a synthesis mixture for the molecular sieve wherein the synthesis mixture includes a morphology modifier L selected from the group consisting of nonionic surfactants, anionic surfactants, sugars and combinations thereof.
Claims20
1) A process of preparing crystals of a molecular sieve having a framework code selected from the group consisting of MEL, MTW, TON, MTT, MRE MWW, MFS, MOR, FAU and MSE, the process comprising the steps of:
- a. combining at least a source of a tetravalent element X, a morphology modifier L, and water to form a synthesis mixture;
- b. heating said synthesis mixture under crystallization conditions for a time of about 1 hour to 100 days to form the crystals of the molecular sieve;
- and
- c. recovering said crystals of the molecular sieve from the synthesis mixture,
- wherein X═Si and the morphology modifier L is selected from the group consisting of nonionic surfactants, anionic surfactants, sugars and combinations thereof, and if a structure directing agent Q is present L is different from and is present in addition to the structure directing agent Q.
15) A molecular sieve having a framework code selected from the group consisting of MEL, MTW, TON, MTT, MRE MWW, MFS, MOR, FAU and MSE, in which the ratio of external surface area to internal surface area is greater than 1.2 and/or in which the ratio of external acidity, as measured by collidine absorption, to internal acidity, as measured by ammonia absorption, is greater than 1.5.
Dependencies are inferred from the claim text.