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- 저자 : Qiangsheng Guo (검색결과 2 건)
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Dongsen Mao,Jun Yu,Qiangsheng Guo 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
The effect of support pretreatment with ammonia on the performance of Cu–Fe/SiO2 catalyst for higher alcohols synthesis from syngas was studied by CO hydrogenation, X-ray diffraction, N2 adsorption– desorption, temperature-programmed reduction of H2, Fourier transform infrared spectroscopy, N2O chemisorption and temperature-programmed desorption of adsorbed CO. The results indicated that the pretreatment of SiO2 with ammonia resulted in the formation of more active sites of Cu and higher dispersion of Fe species on the catalyst surface and enhanced the synergistic effect between the copper and iron species. As a result, the CO conversion and the space time yield of alcohols of the Cu–Fe/SiO2 catalyst increased from 14.8% and 89.0 g kg1 h1 to 17.4% and 107.0 g kg1 h1, respectively.
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Conversion of syngas to C2+ oxygenates over Rh-based/SiO2 catalyst: The promoting effect of Fe
Jun Yu,Dongsen Mao,Lupeng Han,Qiangsheng Guo,Guanzhong Lu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
The effect of Fe promoter on the catalytic properties of Rh–Mn–Li/SiO2 catalyst for CO hydrogenation was investigated. The catalysts were comprehensively characterized by means of X-ray diffraction (XRD), N2adsorption–desorption, temperature programmed reduction (TPR), temperature programmed desorption (TPD), temperature programmed surface reaction (TPSR), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Activity testing results showed that low loading of Fe (≤0.1 wt%)improved the reactivity and yield of C2+ oxygenates; however, the opposite effect appeared at the high values of Fe (>0.1 wt%). Characterization results suggested that the addition of Fe strengthened the Rh–Mn interaction and increased the desorption/transformation rate of adsorbed CO, which could be responsible for the increase of CO conversion. But on the other hand, the existence of Fe might deposit over the Rh surface, and decreased the number of active sites, resulting in the decrease of CO conversion when the Fe amount was excessive. The selectivity to C2+ oxygenates varied inversely with the reducibility of Rh oxide species. Moreover, it is proposed that the transformation of dicarbonyl Rh+(CO)2into H–Rh–CO is favorable for the formation of C2+ oxygenates, and the hydrogenation ability of Fe can increase the hydrogenation of acetaldehyde to ethanol.
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