Activity and stability performance of multifunctional catalyst (Ni/CaO and Ni/Ca12Al14O33CaO) for bio-hydrogen production from sorption enhanced biogas steam reforming
| Autor: | Palang Bumroongsakulsawat, Worapon Kiatkittipong, Suttichai Assabumrungrat, J. G. F. Powell, Janewit Phromprasit, Suwimol Wongsakulphasatch |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment 05 social sciences Non-blocking I/O Mixing (process engineering) Energy Engineering and Power Technology Sorption 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Catalysis Steam reforming Fuel Technology Chemical engineering Biogas Desorption 0502 economics and business 050207 economics 0210 nano-technology Hydrogen production |
| Zdroj: | International Journal of Hydrogen Energy. 41:7318-7331 |
| ISSN: | 0360-3199 |
| Popis: | Modified sorbents (NiO CaO and Ca12Al14O33 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 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. |
| Databáze: | OpenAIRE |
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