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Methane Non-oxidative Aromatization Over Mo Based Catalysts

Author: WuPeng
Tutor: WuTongHao
School: Jilin University
Course: Physical and chemical
Keywords: Zeolites Catalyst carrier Aromatization reactions The outer surface Physical and chemical properties Reaction Performance Synthesis Regularity Selective Acid sites Supercages
CLC: O621.253
Type: PhD thesis
Year: 2005
Downloads: 207
Quote: 1
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Abstract


Molybdenum -based catalysts thesis MCM-22 family molecular sieve carrier around the molecular sieve support for the study, synthesis of the law and its pore structure and methane aromatization relationship between the reaction performance aspects of the following work : study to ammonium (HMI) hexamethyleneamino template agent system under various zeolite synthesis , the synthetic law as well as the physical and chemical properties of the product a more in - depth studies . Provides the material foundation for further study of the catalytic performance . Using a variety of macromolecular organic compounds for poisoning the modified Mo/HZSM-5, Mo/HMCM-49, Mo/HMCM-22 catalyst carrier of the outer surface of the acid sites , respectively . The analysis compared before and after modification of physical and chemical properties of molybdenum -based catalyst zeolite Methane aromatization reaction performance . Study found that the the modified benzene selectivity of the catalyst is significantly improved, and the generation of coke and naphthalene has been a certain degree of control . We believe that the outer surface of the acidic sites of the catalyst carrier , due to the lack of space constraints , the aromatization reaction is to promote the generation of byproducts such as coke . Without cage structure synthesized by swelling of MCM-22 and pillared MCM-36 zeolite and its the carrier preparation Mo/HMCM-36 catalyst investigated the aromatization activity . The study found that the CO, naphthyl Mo/HMCM-36 catalyst and coke selectivity is significantly higher than Mo/HMCM-22, while the benzene selectivity and methane conversion rate is lower than the latter . With the carrier structure is associated , we believe that the influence of 10-membered ring orifice , Supercages structure can to some extent in promoting the conversion of methane and benzene generated . This provides a basis to find a new catalyst carrier . Found in silanated after Mo/HMCM-36 catalyst outer surface and mesopores , the the silylation treatment greatly inhibits the formation of coke in the Mo36 catalyst , significantly improves the selectivity of the benzene product . Therefore, we believe that the 10-membered ring sinusoidal channels in methane aromatization reaction of benzene with a good shape-selective .

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds > Chemical properties of organic reactions > Isomerization
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