The sorption-enhanced steam reforming process was applied to the tar removal to produce high-purity hydrogen. In this study

the reforming catalyst was Ni/Mg-Ca12Al14O33 prepared by solid-state reaction method

and the CO2 sorbent was CaO-Ca12Al14O33 prepared by sol-gel method. The effects of temperature

S/C ratio (the mole ratio of the steam to the carbon in the reaction system) and the WHSV (mass hourly space velocity) on enhancing hydrogen production from tar reforming. The results showed that the addition of the CO2 sorbent can improve the tar reforming efficiency

with the H2 yield and volume fraction increased significantly. Especially

the H2 volume fraction reached over 95%. As the S/C ratio rose and the WHSV declined

the hydrogen production was accelerated

for both of the common steam reforming and the sorption-enhanced reforming. And

for the two processes

when the S/C ratio reached over 12:1 and the WHSV reached below 0.128 h-1

the change of the reforming efficiency was no longer distinct. Compared to the common steam reforming

the best temperature to produce H2 was decreased for the sorption-enhanced reforming

and the H2 yield at 800℃ can reach 87.35%. Compared to thermodynamic results

the H2 yields from the experiment were lower

but the sorption-enhanced reforming can narrow the gap between the experimental and thermodynamic values.