Inderscience Publishers

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

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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°C on Rh/CeO
2
/γ-Al
2
O
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°C 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
2
O
3
. With Pt/CeO
2
-ZrO
2
/Al
2
O
3
catalyst, conversions close to equilibrium could be obtained at 370°C 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.

Keywords: oxidative steam reforming, water-gas shift reaction, WGS, microchannel reactor, fuel processor, ethanol, hydrogen production, rhodium catalyst, platinum catalyst, catalyst deactivation, ceria support

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