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Ling Tao College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China

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Gui-Sheng Li College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China

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Shuang-Feng Yin College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China

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Qiang Ou-Yang College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China

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Sheng-Lian Luo College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China

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Xiao-Ping Zhou College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China

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Chak-Tong Au College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan, 410082, China
Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong

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Abstract

Described in this paper are the synthesis, characterization and catalytic application of H-ZSM-5 zeolites for the conversion of CH3Br into aromatics. The H-ZSM-5 zeolites were fabricated by hydrothermal crystallization using n-butylamine (BTA) as a template and characterized by XRD, SEM and NH3-TPD techniques. The effects of batch SiO2/Al2O3 ratio, alkalinity, NaCl/Al2O3 ratio, seed crystals, and crystallization time on the yield, structure/texture and catalytic performance were systematically studied. Adopting the optimum sol (SiO2/Al2O3 = 70, BTA/SiO2 = 0.2847, Na2O/SiO2 = 0.1237, H2O/SiO2 = 37.4, NaCl/Al2O3 = 60, and seed/SiO2 = 5 wt%) and under the most preferable crystallization conditions of 100 °C/24 h–170 °C/24 h, H-ZSM-5 zeolites of high crystallinity and small size (300–700 nm) were obtained. Good catalytic performance was observed over the H-ZSM-5 zeolites (aromatic yield up to 44.2%). However, unlike the modification of large commercial HZSM-5, the use of MoO3 or PbO as modifying agents for the small-size H-ZSM-5 zeolites results in a decline of catalytic performance. The relationship between the structure and the catalytic efficiency of as-synthesized H-ZSM-5 samples were investigated. It was found that with crystallinity enhancement and/or decline in crystal size, there is improvement of catalytic performance.

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Reaction Kinetics, Mechanisms and Catalysis
Language English
Size B5
Year of
Foundation
1974
Volumes
per Year
1
Issues
per Year
6
Founder Akadémiai Kiadó
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Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Springer Nature Switzerland AG
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ISSN 1878-5190 (Print)
ISSN 1878-5204 (Online)