Molecular sieve catalyst, preparation method therefor, and application thereof
AssigneeDalian Institute of Chemical Physics, Chinese Academy of Sciences
InventorsHongchao Liu, Shiping Liu, Wenliang Zhu, Zhongmin Liu, Xiangang Ma, Yong Liu, Ziqiao Zhou, Youming Ni
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Abstract
Provided are a molecular sieve catalyst, a preparation method therefor, an application thereof. The molecular sieve catalyst contains a modified Na-MOR molecular sieve, and the modification comprises: organic ammonium salt exchange, dealumination treatment, and ammonium ion exchange. The catalyst obtained by the method is used in dimethyl ether for one-step production of methyl acetate. The catalyst has high activity and stable performance, and the needs of industrial production can be satisfied.
Claims16
A method for preparing a molecular sieve catalyst, wherein the method comprises following steps:
- (1) subjecting a Na-MOR molecular sieve to the organic ammonium salt exchange to obtain a precursor I;
- (2) subjecting the precursor I to an acid treatment to obtain a precursor II;
- (3) subjecting the precursor II to a calcination treatment to obtain a precursor III;
- (4) subjecting the precursor III to the ammonium ion exchange to obtain a precursor IV;
- and
- (5) calcining the precursor IV to obtain the molecular sieve catalyst;
- wherein the organic ammonium salt exchange is an alkyl ammonium halide salt exchange and the alkyl ammonium halide salt is at least one of compounds having a chemical formula shown in Formula I,
- wherein R1, R2 and R3 are independently selected from C1˜C10 alkyl group;
- R4 is selected from one of C1 to C10 alkyl group and C6 to C10 aryl group;
- and
- X is selected from at least one of F, Cl, Br and I;
- a silicon to aluminum atomic ratio of the Na-MOR molecular sieve ranges from 6 to 50;
- wherein the calcination treatment in step (3) is carried out in an atmosphere with a steam concentration ranging from 0 to 100%, at a temperature ranging from 300 to 800° C. for a time ranging from 1 to 10 hours.
Dependencies are inferred from the claim text.