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题名: Study of Mo-based catalysts for dehydro-aromatization of methane
作者: Ye, F;  Yu, L;  Song, YB;  Sun, CY;  Fang, YW;  Hao, ZF;  Lin, WM;  Xu, YD;  Lin, LW
关键词: methane ;  aromatization ;  HZSM-5 zeolite ;  pricise pretreatment ;  carbon deposit ;  iron ;  molybdenum
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2003-03-01
卷: 24, 期:3, 页:198-202
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Methane dehydro-aromatization over Mo/HZSM-5 catalyst has been widely studied in recent years. One of the main problems for the industrial application is the short lifetime of the catalyst owing to the serious carbon deposit on the catalyst surface. The addition of CO or CO2 in feed as well as the steaming-dealumination and the silanization of the support was used to enhance the stability of the catalyst. In order to effectively suppress the formation of carbon deposit, we designed an easy and special route to prepare the Mo/HZSM-5(t) catalyst, in which HZSM-5 was precisely pretreated by calcination in air at 400 degreesC for 4 h, then re-calcination in N-2 at 500 degreesC for 4 h (precise pretreatment of support) before impregnation with ammonium molybdate. The precise pretreatment was found to be able to significantly improve the activity and the stability of the catalyst. On Mo/HZSM-5 (t), the methane conversion and benzene yield even remained at 8.8% and 5.3% respectively after 30 h. Addition of promoter Fe leads to a significant increase in methane conversion and the selectivity for benzene, and methane conversion and benzene yield increase by 18% and 52% respectively, compared with Mo/ HZSM-5(t). Through XRD and TPO characterization, it is concluded that Mo and Fe species are highly dispersed on the surface of the support or migrate into the channels of the support. The precise pretreatment of support and the addition of Fe restrain carbon deposit, hence the catalysts with high stability can be obtained.
关键词[WOS]: ZEOLITE CATALYSTS ;  NONOXIDATIVE CONDITIONS ;  MO/HZSM-5 ;  BENZENE ;  CONVERSION ;  DEHYDROCONDENSATION ;  NAPHTHALENE ;  PERIOD ;  SITES
语种: 英语
WOS记录号: WOS:000182347400009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138322
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Shantou Univ, Dept Chem, Shantou 515063, Guangdong, Peoples R China
2.S China Univ Technol, Dept Chem Engn, Guangzhou 510641, Guangdong, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Ye, F,Yu, L,Song, YB,et al. Study of Mo-based catalysts for dehydro-aromatization of methane[J]. CHINESE JOURNAL OF CATALYSIS,2003,24(3):198-202.
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