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Study of Catalysts for Biology Ethanol Aromatization

Author: SongShaoQing
Tutor: LiBin
School: Guangxi University
Course: Applied Chemistry
Keywords: Pt/CeO2 Pt/CeO2/Mo/ZSM-5 Aromatization Molecular sieve Characterization of catalytic properties
CLC: O643.32
Type: Master's thesis
Year: 2007
Downloads: 74
Quote: 0
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Abstract


Benzene is a widely used chemical raw materials, mainly from oil processing by-products. With the increasingly exhausted oil resources, the production of benzene can also be greatly affected. Bio-ethanol as a green resources in the future will replace petroleum by-products as the main raw material in the chemical production. Bio-ethanol as raw material, choose a suitable catalyst, catalytic ethanol to benzene, in line with the use and development of renewable resources and sustainable development requirements, and thus has a very important significance. Ethanol aromatization catalyst of. Combined oxidative aromatization of methane a good the catalyst Mo/ZSM-5 and ethanol oxidation process the benzene formation Pt / CeO 2 catalyst, prepared by impregnation with different Pt loading amount of Pt / of CeO 2 molecular sieve catalyst for different Mo loading amount in the Mo/ZSM-5, and M/ZSM-5 (M Cu, Sr, Co, Fe, Cd, Zn, Sb), and 8% (wt) the MoO 3 Mo/ZSM-5 loading amount of molecular sieve as the main body, was prepared by the same Pt ??content of the load and the type of the CeO 2 content of Pt / CeO < sub> 2 / Mo/ZSM-5 molecular sieve catalyst. XRD, BET and NH 3 -TPD analysis techniques were used to characterize the load metal zeolite stability, specific surface area and acid. The results show that the supported Mo oxide molecular sieve roasting temperature of 773K, to maintain the integrity of the ZSM-5 zeolite skeleton. With the increase of the loading amount of the metal oxide, a molecular sieve surface area and total acid volume decreased; the load Pt / CeO 2 Mo/ZSM-5 zeolite after calcination in the temperature of 773K, ZSM- 5 zeolite skeleton remains intact. Prepared metal loaded zeolite catalyst, fixed bed reactor for the continuous flow method initially explored the ethanol oxidative aromatization performance, effects of the calcination temperature, calcination time, activation temperature, activation time on the catalytic performance , and the catalyst life. Identified these catalysts the ethanol dehydroaromatization structure suitable reaction conditions, and filter out from among them three catalytic activity of ethanol aromatization catalyst, Pt / CeO 2 / Mo / ZSM -5 molecular sieve catalyst under suitable reaction conditions, the highest catalytic activity, the ethanol conversion rate reached 71.63%, benzene selectivity of 23.6%. Finally, explore the the oxidative aromatization catalytic mechanism of ethanol on the catalyst.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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