06-06-2013 дата публикации
Номер: US20130144100A1
In a process for preparing a high activity, large crystal ZSM-5 type zeolite in the absence of a template, a reaction mixture can be prepared comprising water, a silica source having a surface area less than 150 m/g, an alumina source, seeds, a source of an oxide of an alkali metal, M, and a source of gluconic acid or salt thereof, Q, wherein the mixture has a SiO/AlOmolar ratio≦40. The reaction mixture can be heated to a crystallization temperature from about 100° C. to 200° C. for a time sufficient for crystals of ZSM-5 to form Crystals of ZSM-5 can then be recovered from the reaction mixture which crystals can have a SiO/AlOmolar ratio≦40 and a majority of which crystals can have at least one crystalline dimension of at least about 2 μm. 1. A process for preparing a high activity , large crystal ZSM-5 type zeolite in the absence of a template , the process comprising:{'sup': '2', 'sub': 2', '2', '3, '(a) preparing a reaction mixture comprising water, a silica source having a surface area less than 150 m/g, an alumina source, seeds, a source of an oxide of an alkali metal, M, and a source of gluconic acid or salt thereof, Q, wherein said mixture has a SiO/AlOmolar ratio less than or equal to 40;'}(b) heating the reaction mixture at a crystallization temperature from about 100° C. to 200° C. for a time sufficient for crystals of ZSM-5 to form; and{'sub': 2', '2', '3, '(c) recovering from the reaction mixture crystals of ZSM-5 having a SiO/AlOmolar ratio less than or equal to 40, wherein a majority of the crystals have at least one crystalline dimension of at least about 2 μm.'}2. The process of claim 1 , wherein the silica source has a specific surface area less than 125 m/g.3. The process of claim 1 , wherein the reaction mixture has a molar composition in the following amounts:{'sub': 2', '2', '3, 'SiO/AlO: up to about 40/1;'}{'sub': 2', '2, 'HO/SiO: about 5 to about 50;'}{'sup': '−', 'sub': '2', 'OH/SiO: about 0.05 to about 0.5'}{'sub': '2', 'M/SiO; about 0.05 ...
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