Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5

Ling Tao; Lang Chen; Shuang-Feng Yin; Sheng-Lian Luo; Yan-Qun Ren; Wen-Sheng Li; Xiao-Ping Zhou; Chak-Tong Au

doi:10.1016/j.apcata.2009.07.039

Catalytic conversion of CH₃Br to aromatics over PbO-modified HZSM-5

Ling Tao, Lang Chen, Shuang-Feng Yin^*, Sheng-Lian Luo, Yan-Qun Ren, Wen-Sheng Li, Xiao-Ping Zhou, Chak-Tong Au

^*Corresponding author for this work

Department of Chemistry

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Abstract

The catalytic conversion of CH₃Br to aromatics was investigated over PbO-modified HZSM-5. The effects of PbO loading, SiO₂/Al₂O₃ molar ratio of HZSM-5, and calcination conditions of catalyst on catalytic performance were studied. It was found that the most suitable PbO loading and SiO₂/Al₂O₃ ratio are 5 wt% and 70, respectively. The 5 wt% PbO/HZSM-5 calcined at 450 °C for 8 h performs the best. Also, PbO is superior to the other metal oxides selected to modify HZSM-5, and HZSM-5 is better than SiO₂, Al₂O₃ or ZrO₂ as support. The characterization results indicate that (i) the PbO species is highly dispersed on the HZSM-5 support, (ii) the role of PbO is to promote hydrocarbon aromatization, and (iii) the acid sites of HZSM-5 are indispensable for CH₃Br conversion into aromatics. We found that the deactivation of catalyst is due to pore blocking by carbonaceous deposits. The overall results demonstrate that the method is efficient for the conversion of CH₄ to aromatics.

Original language	English
Pages (from-to)	99-107
Number of pages	9
Journal	Applied Catalysis A: General
Volume	367
Issue number	1-2
Early online date	5 Aug 2009
DOIs	https://doi.org/10.1016/j.apcata.2009.07.039
Publication status	Published - Oct 2009

User-Defined Keywords

Aromatics
Bromomethane
HZSM-5
Lead oxide

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10.1016/j.apcata.2009.07.039

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title = "Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5",

abstract = "The catalytic conversion of CH3Br to aromatics was investigated over PbO-modified HZSM-5. The effects of PbO loading, SiO2/Al2O3 molar ratio of HZSM-5, and calcination conditions of catalyst on catalytic performance were studied. It was found that the most suitable PbO loading and SiO2/Al2O3 ratio are 5 wt% and 70, respectively. The 5 wt% PbO/HZSM-5 calcined at 450 °C for 8 h performs the best. Also, PbO is superior to the other metal oxides selected to modify HZSM-5, and HZSM-5 is better than SiO2, Al2O3 or ZrO2 as support. The characterization results indicate that (i) the PbO species is highly dispersed on the HZSM-5 support, (ii) the role of PbO is to promote hydrocarbon aromatization, and (iii) the acid sites of HZSM-5 are indispensable for CH3Br conversion into aromatics. We found that the deactivation of catalyst is due to pore blocking by carbonaceous deposits. The overall results demonstrate that the method is efficient for the conversion of CH4 to aromatics.",

keywords = "Aromatics, Bromomethane, HZSM-5, Lead oxide",

author = "Ling Tao and Lang Chen and Shuang-Feng Yin and Sheng-Lian Luo and Yan-Qun Ren and Wen-Sheng Li and Xiao-Ping Zhou and Chak-Tong Au",

note = "Funding Information: This project was financially supported by the National Natural Science Foundation of Chin a ( 20873038 ), Doctoral Program Foundation of Institutions of Higher Education of China (Grant No. 200805320001 ), Outstanding Young Research Award of National Natural Science Foundation of China (Grant No E50725825 ), and the Ministry of Science and Technology of China (Grant No. 2006BAE02B05 ). C.T. Au thanks Hunan University for an adjunct professorship.",

year = "2009",

month = oct,

doi = "10.1016/j.apcata.2009.07.039",

language = "English",

volume = "367",

pages = "99--107",

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T1 - Catalytic conversion of CH3Br to aromatics over PbO-modified HZSM-5

AU - Tao, Ling

AU - Chen, Lang

AU - Yin, Shuang-Feng

AU - Luo, Sheng-Lian

AU - Ren, Yan-Qun

AU - Li, Wen-Sheng

AU - Zhou, Xiao-Ping

AU - Au, Chak-Tong

N1 - Funding Information: This project was financially supported by the National Natural Science Foundation of Chin a ( 20873038 ), Doctoral Program Foundation of Institutions of Higher Education of China (Grant No. 200805320001 ), Outstanding Young Research Award of National Natural Science Foundation of China (Grant No E50725825 ), and the Ministry of Science and Technology of China (Grant No. 2006BAE02B05 ). C.T. Au thanks Hunan University for an adjunct professorship.

PY - 2009/10

Y1 - 2009/10

N2 - The catalytic conversion of CH3Br to aromatics was investigated over PbO-modified HZSM-5. The effects of PbO loading, SiO2/Al2O3 molar ratio of HZSM-5, and calcination conditions of catalyst on catalytic performance were studied. It was found that the most suitable PbO loading and SiO2/Al2O3 ratio are 5 wt% and 70, respectively. The 5 wt% PbO/HZSM-5 calcined at 450 °C for 8 h performs the best. Also, PbO is superior to the other metal oxides selected to modify HZSM-5, and HZSM-5 is better than SiO2, Al2O3 or ZrO2 as support. The characterization results indicate that (i) the PbO species is highly dispersed on the HZSM-5 support, (ii) the role of PbO is to promote hydrocarbon aromatization, and (iii) the acid sites of HZSM-5 are indispensable for CH3Br conversion into aromatics. We found that the deactivation of catalyst is due to pore blocking by carbonaceous deposits. The overall results demonstrate that the method is efficient for the conversion of CH4 to aromatics.

AB - The catalytic conversion of CH3Br to aromatics was investigated over PbO-modified HZSM-5. The effects of PbO loading, SiO2/Al2O3 molar ratio of HZSM-5, and calcination conditions of catalyst on catalytic performance were studied. It was found that the most suitable PbO loading and SiO2/Al2O3 ratio are 5 wt% and 70, respectively. The 5 wt% PbO/HZSM-5 calcined at 450 °C for 8 h performs the best. Also, PbO is superior to the other metal oxides selected to modify HZSM-5, and HZSM-5 is better than SiO2, Al2O3 or ZrO2 as support. The characterization results indicate that (i) the PbO species is highly dispersed on the HZSM-5 support, (ii) the role of PbO is to promote hydrocarbon aromatization, and (iii) the acid sites of HZSM-5 are indispensable for CH3Br conversion into aromatics. We found that the deactivation of catalyst is due to pore blocking by carbonaceous deposits. The overall results demonstrate that the method is efficient for the conversion of CH4 to aromatics.

KW - Aromatics

KW - Bromomethane

KW - HZSM-5

KW - Lead oxide

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JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1-2

ER -

Catalytic conversion of CH₃Br to aromatics over PbO-modified HZSM-5

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