Activity and stability performance of multifunctional catalyst (Ni/CaO and Ni/Ca12Al14O33-CaO) for bio-hydrogen production from sorption enhanced biogas steam reforming

作者：Phromprasit Janewit; Powell Jonathan; Wongsakulphasatch Suwiynol; Kiatkittipong Worapon; Bumroongsakulsawat Palang; Assabumrungrat Suttichai

来源：International Journal of Hydrogen Energy, 2016, 41(18): 7318-7331.

DOI：10.1016/j.ijhydene.2016.03.125

• CO2 capture
• CaO
• Multifunctional catalyst
• H-2 production
• Sorption enhanced biogas steam reforming

Modified sorbents (NiO-CaO and Ca(12)A(14)O(33)-CaO) were synthesized by hydration followed by wet mixing (HW) and tested in terms of their CO2 sorption/desorption performance over multiple cycles. The results indicated the sorption capacities for Ni-CaO-HW and Al-CaO-HW decreased by only 3.8% and 6.4%, respectively, over 10 cycles. Various sequences of Ni2+ loading onto modified CaO were investigated. The results indicated Ni-Al-CaO-HW to be the best performing exhibiting a pre-breakthrough time 30 min longer than the other samples. However, the H-2 purity and CH4 conversion did not differ significantly amongst the various sorbents (approx. 94% purity H-2 and approx. 90% CH4 conversion pre-breakthrough). The stability of the Ni-Al-CaO-HW was also investigated and the results indicated that the pre-breakthrough CH4 conversion could be maintained at steady values for five cycles. However, the post-breakthrough CH4 conversion decreases slightly over five cycles. A plausible explanation is that the formation of CaCO3 results in the blockage of pores and active sites, which is supported by XPS results.

• 出版日期2016-5-18