Citation:
CHEN Wei-Miao, DING Yun-Jie, LUO Hong-Yuan, YAN Li, WANG Tao, PAN Zhen-Dong, ZHU He-Jun. Influence of Preparation Method and Conditions on Performance of Rh-Mn-Li-Ti/SiO2 Catalyst for CO Hydrogenation to C2-oxygenates[J]. Chinese Journal of Applied Chemistry,
;2005, 22(5): 470-474.
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The effects of the calcination temperature of precursor TiOx/SiO2 and the drying time for catalyst Rh-Mn-Li-Ti/SiO2(ω(Ti)=0.005%) on its performance for the synthesis of C2-oxygenates from syngas were investigated by means of CO hydrogenation,temperature-programmed reduction (TPR),and temperature-programmed desorption (CO-TPD).The results obtained show that the calcination temperature of the precursor TiOx/SiO2 has a significant effect on the catalytic activity of Rh-Mn-Li-Ti/SiO2 in the formation of C2-oxygenates.The catalyst calcined at 873 K yielded 395.0 g/(kg(cat)·h) C2-oxygenates with 46.1% selectivity toward C2-oxygenates based on carbon.When the drying time of the catalyst was prolonged properly,the yield of C2-oxygenates reached 425.8 g/(kg(cat)·h),with little change in the C2-oxygenates selectivity.The TPR results suggest that the calcination temperature of TiOx/SiO2 and the drying time of the catalyst Rh-Mn-Li-Ti/SiO2 could regulate the interaction between the Rh species with the Mn species,and weak interactions between the Rh species and the Mn species would lead to higher catalytic performance.CO-TPD results indicate that both CO desorption peaks shifted to lower temperatures when the calcination temperature of TiOx/SiO2 was higher.
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Keywords:
- rhodium-based catalyst,
- titanium,
- carbon monoxide,
- hydrogenation,
- syngas,
- C2-oxygenate
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