Development of a microfuel processor: oxidative steam reforming of ethanol and water-gas shift reaction on noble metal catalysts in a microreactor

摘要

The oxidative steam reforming of ethanol (OSRE) and water-gas shift (WGS) reactions were studied in a microchannel reactor. For OSRE, the experiments were conducted at atmospheric pressure, with water to ethanol molar ratio of 3 or 6 and oxygen to ethanol molar ratio ranging from 0.5 to 1.5, over a temperature range of 350-550℃ on Rh/CeO_2/y-Al_2O_3 catalysts. Compared to SRE, the activity in OSRE was higher, but the selectivity to desired products was slightly lower. The H2 yield obtained in OSRE was ～120 m~3.kg~(-1).h~(-1). For WGS, the experiments were conducted at atmospheric pressure in the temperature range of 250-400℃ on Pt supported on different oxides. The order of activity for Pt supported on different oxides was CeO_2-ZrO_2 ＞ CeO_2 ＞ TiO_2 ＞ ZrO_2 ＞ Al_2O_3. With Pt/CeO_2-ZrO_2/Al_2O_3 catalyst, conversions close to equilibrium could be obtained at 370℃ and wt. of catalyst/molar flow rate of CO = 11.4 g.h.mol~(-1). Moreover, this catalyst did not show any deactivation in a 10 h run.