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	Study on doubly promoted W/MCM-22-based catalysts for dehydro-aromatization of CH4 in the absence of O-2; 甲烷无氧脱氢芳构化双促进W/MCM-22基催化剂研究
	Huang,LQ ; Huang LQ(黄利强) ; Zeng,JL ; Ceng JL(曾金龙) ; Lin,GD ; Lin GD(林国栋) ; Yuan,YZ ; Yuan YZ(袁友珠) ; Zhang,HB ; Zhang HB(张鸿斌)
	2004-09-28
关键词	W/HZSM-5-BASED CATALYSTS METHANE DEHYDROGENATION PERFORMANCE
英文摘要	With incorporation of Ga3+/Zn2+ (or Co3+/2+/Mon+) into a W/MCM-22 host catalyst, highly active and heat-resistant doubly promoted W/MCM-22-based catalysts for dehydro-aromatization of methane ( abbreviated as DHAM) were prepared. Over an 8% W-0.1% Co-0.4% Mo/MCM-22 or 8% W-0.1% Ga-0.6% Zn/MCM-22 catalyst, 70% similar to 72% selectivity to benzene formation at similar to 15% conversion of CH4 could be achieved in the initial similar to 3 h of reaction under reaction condition of 0.1 MPa, 1073 K, GHSV = 1500 mL(STP) (.) h(-1) (.) (g-cat.)(-1). Addition of a proper amount of CO2 (less than or equal to 1.2%) or H-2 (similar to 7.0%) to the feed-gas was found to significantly enhance conversion of CH4 and selectivity to benzene, and to improve the performance of coke-resistance of the catalysts. By correlating the results of the NH3-TPD measurements and the catalyst tests, it was confirmed that intensity and concentration of the surface B-acid sites have pronounced effects on the performance of the catalyst for DHAM reaction. It was found experimentally that addition of a proper amount of Ga3+/Zn2+( or Co3+/2+/Mon+) into W/MCM-22 host catalyst resulted not only in eliminating parts of the strong surface B-acid sites but also in generating a kind of new medium-strung acid sites, mostly B-acid sites, simultaneously. The latter could serve as the catalytically active sites for DRAM reaction, and on such medium-strong surface B-acid sites, the formation of coke would be also alleviated to a greater extent. On the other hand, the doping of the Ga3+/Zn2+ (or Co3+/2+/Mon+)-components to tungsten oxide matrix would facilitate inhibiting aggregation of the W-containing active species and improving dispersion of the W-component at the surface of catalyst, thus leading to a pronounced decrease in the reduction-temperature for the hard-to-be-reduced W6+-species and an increase in quantity of the reducible W6+-species, as evidenced by the results of the H-2-TPR study. The above two roles that Ga3+/Zn2+ (or Co3+/2+/Mon+) as promoters played were contributed to the high CH4 conversion and benzene selectivity, the alleviation of coke deposition and the improvement of the durability of the catalyst.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/62040]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Huang,LQ,Huang LQ,Zeng,JL,et al. Study on doubly promoted W/MCM-22-based catalysts for dehydro-aromatization of CH4 in the absence of O-2, 甲烷无氧脱氢芳构化双促进W/MCM-22基催化剂研究[J],2004.
APA	Huang,LQ.,黄利强.,Zeng,JL.,曾金龙.,Lin,GD.,...&张鸿斌.(2004).Study on doubly promoted W/MCM-22-based catalysts for dehydro-aromatization of CH4 in the absence of O-2..
MLA	Huang,LQ,et al."Study on doubly promoted W/MCM-22-based catalysts for dehydro-aromatization of CH4 in the absence of O-2".(2004).

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