Activity and stability performance of multifunctional catalyst (Ni/CaO and Ni/Ca12Al14O33CaO) for bio-hydrogen production from sorption enhanced biogas steam reforming. (18th May 2016)

• Record Type: Journal Article
• Authors: Phromprasit, Janewit; Powell, Jonathan; Wongsakulphasatch, Suwimol; Kiatkittipong, Worapon; Bumroongsakulsawat, Palang; Assabumrungrat, Suttichai
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 18(2016)
• Page Start: 7318
• Page End: 7331
• Publication Date: 2016-05-18
• Subjects: CO2 capture -- CaO -- Multifunctional catalyst -- H2 production -- Sorption enhanced biogas steam reforming; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.03.125
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Modified sorbents (NiOCaO and Ca12 Al14 O33 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 Ni 2+ 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 H2 purity and CH4 conversion did not differ significantly amongst the various sorbents (approx. 94% purity H2 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. Highlights: Modification of CaO by adding Ni 2+ and Al 3+ for improved CO2 capture. Bio-hydrogen production by sorption enhanced biogas steam reforming. Ni/Ca12 Al14 O33 CaO as multifunctional catalyst. Best synthesis sequence by simultaneous adding of Ni 2+ and Al 3+ on CaO. Multiple cycle operations are tested for both CO2 capture and H2 production.