Abstract
The integration process of sorption-enhanced steam reforming (SESR) reaction and methane reforming (MR) of carbonates provides a promising way to produce high-purity H2 without CO2 emission. However, the huge different reaction temperature of SESR (~550 °C) and MR (>750 °C) hinders this coupling process. Herein, we report that the Pd-promoted Ni-Ca-Al bi-functional catalyst can lower the MR reaction temperature to 650 °C by enhancing CH4 decomposition activity to provide H2 molecules or atoms. The low regeneration temperature significantly improves the stability of SESR of glycerol (SESRG) reaction with only 8% increase in Ni particle size and 25% decrease of sorption-enhanced effect after 10 SESRG-MR cycles. Thanks to the high stability of the catalyst, 98.3% hydrogen-enriched stream and syngas with RH2/CO < 3 are co-produced in ten cyclic tests. Therefore, lowering the regeneration temperature can simultaneously weaken the thermal-swing operation and improve the stability of the catalyst during the SESR-MR reaction.
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