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
DOIs	https://doi.org/10.1016/j.apcata.2009.07.039
Publication status	Published - 1 Oct 2009

Scopus Subject Areas

Catalysis
Process Chemistry and Technology

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 Yin, {Shuang Feng} and Luo, {Sheng Lian} and Ren, {Yan Qun} and Li, {Wen Sheng} and Zhou, {Xiao Ping} and AU, {Chak Tong}",

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.",

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

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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 - 2009/10/1

Y1 - 2009/10/1

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

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