catalytic performance of rhodium-based catalysts have been comprehensively studied: the promoters, including manganese, ceria, iron, vanadium, titanium, iridium and lithium, etc., the supporters, including SiO 2 , Al 2 O 3 , ZrO 2 , and NaY zeolites, and the novel preparation processes, including sol-gel and micro-emulsion [1][2][3].Glow discharge plasma, as an ionized non-equilibrium system applied in catalysts preparation, can endow catalysts with a modification in their surface properties, and a disorder in their crystallite. On supported catalysts, glow discharge plasma can modify the active compounds distribution and the interaction among the supporter, additives and active compounds. Thus, this method can improve the activity and selectivity in catalytic performance [4][5][6].In this paper, the plasma-promoted Rh-Ce-Mn/SiO 2 catalysts were prepared, and the characterizations such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H 2 temperature-programmed reduction (H 2 -TPR), H 2 temperature-programmed desorption (H 2 -TPD) and CO temperature-programmed desorption (CO-TPD) were utilized to reveal the effect of plasma on active components dispersion, and on reducibility and adsorption capacity. The oxygenate synthesis from CO hydrogenation was carried out as a model reaction to measure the catalytic performance. Experimental Catalysts preparationThe catalysts were prepared by co-impregnation of silica gel with appropriate solutions of RhCl 3 , Ce(NO 3 ) 3 and Mn(NO 3 ) 2 , followed by drying at 110°C for 10 h. Then the sample calcined at 350°C for 3 h in air was obtained and called as RCM/S. The other precursors were put into the discharging tube of GP062DL3 plasma generator, and then treated by glow discharge plasma in nitrogen for 45 min, followed by Abstract Rhodium-based catalysts were prepared by impregnation, treated with glow discharge plasma, characterized by X-ray diffraction, X-ray photoelectron spectroscopy, H 2 temperature-programmed reduction, H 2 temperatureprogrammed desorption and CO temperature-programmed desorption, and investigated for oxygenate synthesis from CO hydrogenation. Based on the characterization results, plasma treatment endowed the samples with smaller particle size, higher dispersion of active components, and an enrichment of active components on the surface as well. As a result, the reducibility and adsorption properties were modified. In catalytic tests, the catalytic activity for CO hydrogenation over the samples treated by plasma was improved remarkably: the conversion of CO and the yield of oxygenates increased at most by a factor of 78.62% and 51.96%, respectively, while the selectivity of ethanol and methanol in the oxygenates was enhanced as well.
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