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Nonmetal modified catalyst and preparation method for same
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A kind of non-metal and catalyst technology, applied in the field of non-metal modified catalyst and its preparation
Inactive Publication Date: 2017-05-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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[0004] In conjunction with the prior art content, it can be seen that the current research on the conversion of methanol mainly focuses on the development of catalysts for the conversion of methanol to olefins (or propylene), the conversion of methanol to gasoline and the conversion of methanol to aromatics. A Report on Catalysts Used in Xylene
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[0034] The invention provides a kind of preparation method of described metal-free modified catalyst, comprises the following steps:
[0036] impregnating the zeolite molecular sieve in a non-metal source solution to obtain an impregnated product, the non-metal source being a phosphorus source, a boron source or a silicon source;
[0037] The impregnated product is subjected to a third calcination to obtain a non-metallic modified catalyst.
[0038] In the invention, the ZSM-5 molecular sieve is sequentially subjected to first roasting, ion exchange and second roasting to obtain the zeolite molecular sieve. In the present invention, the temperature of the first calcination is preferably 400-560°C, more preferably 450-520°C, most preferably 480-500°C; the time of the first calcination is preferably 6-12 hours, more preferab...
Embodiment 1
[0052] The ZSM-5 molecular sieve was calcined at 550°C for 6 hours, the ammoniumnitrate solution was ion-exchanged at 60°C, and calcined again at 550°C for 4 hours to obtain the H-type ZSM-5 molecular sieve catalyst.
[0053] 0.11 g of diammonium hydrogenphosphate was supported on 2.5 g of H-type ZSM-5 molecular sieve catalyst by equal volume impregnation method, impregnated for 24 hours, dried and calcined at 480° C. for 4 hours.
[0054] The prepared catalyst with 1 wt.% phosphorus supported on 2 μm ZSM-5 molecular sieve is marked as 1P / Z-2.
Embodiment 2
[0056] The ZSM-5 molecular sieve was calcined at 4500°C for 6 hours, the ammoniumnitrate solution was ion-exchanged at 80°C, and calcined again at 500°C for 4 hours to obtain the H-type ZSM-5 molecular sieve catalyst.
[0057] 0.32 g of diammonium hydrogenphosphate was loaded on 2.5 g of H-type ZSM-5 molecular sieve catalyst by equal volume impregnation method, impregnated for 24 hours, dried and calcined at 530° C. for 4 hours.
[0058] The prepared catalyst with 3wt.% phosphorus supported on 2μm ZSM-5 molecular sieve is marked as 3P / Z-2.
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Abstract
The invention provides a nonmetal modified catalyst, which is obtained by chemically modifying a ZSM-5 molecular sieve with a nonmetal, wherein the nonmetal is phosphorus, boron or silicon; the mass ratio of the nonmetal to the ZSM-5 molecular sieve is (0.1 to 10):100. The nonmetal modified catalyst can be used for catalyzing conversion of methanol for preparation of p-xylene and coproduction of gasoline and light olefin. An experimental result of the embodiment shows that the nonmetal modified catalyst can be used for successfully catalyzing conversion of the methanol and the conversion rate of the methanol is 97.9 to 99.8 percent; reaction products comprise the p-xylene as well as the gasoline and the light olefin. In addition, the catalyst has high selectivity for both xylene and the p-xylene, the selectivity of the xylene in an obtained olefin substance is 73.6 to 86.8 percent, and the selectivity of the p-xylene in a xylene product is 41.4 to 95.7 percent.
Description
technical field [0001] The invention relates to the technical field of catalysts, in particular to a non-metallic modified catalyst and a preparation method thereof. Background technique [0002] P-xylene is an important organic chemical raw material, which is widely used in many chemical production fields such as chemical fiber, synthetic resin, pesticide, medicine and plastic. Generally, p-xylene is extracted and separated from catalytic reformed oil, pyrolysisgasoline and tar, or obtained by disproportionation of toluene, alkylation of toluene with methanol or methylation transfer between toluene and trimethylbenzene. However, the above-mentioned production processes all depend on petroleum resources, and the petroleum resources as the main production raw materials are increasingly scarce, resulting in an increasing gap in the production of p-xylene, which triggers an urgent need to open up new ways to produce p-xylene. [0003] As a petroleum supplementary route, the p...
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