Infrared Spectroscopy Study of CO Adsorption on Rh-Mn/SiO2 Catalyst for C-2-Oxygenates Synthesis from Syngas

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	Infrared Spectroscopy Study of CO Adsorption on Rh-Mn/SiO2 Catalyst for C-2-Oxygenates Synthesis from Syngas
	Chen Mingying ; Weng Weizheng ; Hua Weiqi ; Yi Xiaodong ; Wan Huilin ; Yi XD(伊晓东)
刊名	http://dx.doi.org/10.3724/SP.J.1088.2011.01132
	2011-04
关键词	RHODIUM SILICA CATALYSTS PROMOTED RH/SIO2 CATALYSTS SUPPORTED RHODIUM CARBON-MONOXIDE RH-CATALYSTS HYDROGENATION CHEMISORPTION MECHANISM MN RH-MN-LI/SIO2
英文摘要	National Natural Science Foundation of China [21033006, 20923004, 20873111]; National Basic Research Program of China (973 Program) [2010CB732303]; Fujian Provincial Key Sci-Tech Project [2009HZ0002-1]; The Rh-xMn/SiO2(x is Mn/Rh atomic ratio = 0-3) catalyst samples were prepared by conventional co-impregnation. The samples were characterized by transmission electron microscopy, X-ray diffraction and catalytic performance evaluation using CO hydrogenation to C-2-oxygenates. CO adsorption behavior over Rh-xMn/SiO2 catalyst under CO and syngas atmosphere at 50 and 280 degrees C, temperature-programmed reaction of CO with H-2 on the Rh/SiO(2)and Rh-0.5Mn/SiO(2)catalyst samples between 50 and 280 degrees C, and the change of the gem-dicarbonyl species with increasing temperature under CO atmosphere and vacuum were also studied by infrared spectroscopy. The results showed that, when the temperature was higher than 200 degrees C, the gem-dicarbonyl species was undetectable on the catalyst in the presence of CO, implying that Rh+ site is unlikely the active site for CO insertion. The addition of Mn promoter resulted in the formation of tilted CO. The addition of Mn could be also in favor of weakening the Rh-C bond in the linear CO adspecies, which facilitated the linear CO migration on the catalyst surface and enhanced the rate of CO insertion into CHx. This is consistent with the results from the experiment to improve C-2-oxygenates selectivity with addition of Mn into Rh/SiO2 catalyst. The formyl adspecies was detected by infrared spectroscopy in the experiment of temperature-programmed reaction of syngas over Rh-0.5Mn/SiO2 catalyst. This result suggests that addition of Mn to Rh/SiO2 is helpful to stabilize formyl species and this will be favorable to enhance the rate of hydrogen-assisted CO dissociation during the hydrogenation of CO to C-2-oxygenates.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/61280]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Chen Mingying,Weng Weizheng,Hua Weiqi,et al. Infrared Spectroscopy Study of CO Adsorption on Rh-Mn/SiO2 Catalyst for C-2-Oxygenates Synthesis from Syngas[J]. http://dx.doi.org/10.3724/SP.J.1088.2011.01132,2011.
APA	Chen Mingying,Weng Weizheng,Hua Weiqi,Yi Xiaodong,Wan Huilin,&伊晓东.(2011).Infrared Spectroscopy Study of CO Adsorption on Rh-Mn/SiO2 Catalyst for C-2-Oxygenates Synthesis from Syngas.http://dx.doi.org/10.3724/SP.J.1088.2011.01132.
MLA	Chen Mingying,et al."Infrared Spectroscopy Study of CO Adsorption on Rh-Mn/SiO2 Catalyst for C-2-Oxygenates Synthesis from Syngas".http://dx.doi.org/10.3724/SP.J.1088.2011.01132 (2011).