Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming
Ni/α-Al2O3 catalysts containing CaZrO3 nanoparticles as a promoter were prepared by sequential impregnation for H2 production from steam-methane reforming. The effects of different loadings of CaZrO3 nanoparticles from 0 to 15 wt% on the catalytic performance of Ni/α-Al2O3 catalysts in steam-methane...
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my.utm.812902019-08-04T03:34:06Z http://eprints.utm.my/id/eprint/81290/ Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming Lertwittayanon, K. Youravong, W. Lau, W. J. Q Science (General) Ni/α-Al2O3 catalysts containing CaZrO3 nanoparticles as a promoter were prepared by sequential impregnation for H2 production from steam-methane reforming. The effects of different loadings of CaZrO3 nanoparticles from 0 to 15 wt% on the catalytic performance of Ni/α-Al2O3 catalysts in steam-methane reforming were studied. The Ni/α-Al2O3 catalysts containing 15 wt% CaZrO3 nanoparticles provided the highest H2 yield due to facilitative steps of enormous steam adsorption-dissociation at the sites of oxygen vacancies on the surface of CaZrO3 nanoparticles. The existence of facilitative steps created additional H+ and OH− enhancing both H2 yield and the gasification of deposited carbon, respectively. The tests of steam-methane reforming at low S/C ratio of 1/3 for 97 h revealed that the catalytic performance of CaZrO3-modified Ni/α-Al2O3 catalysts was higher than that of the unmodified Ni/α-Al2O3 catalyst. Interestingly, at high S/C ratio of 3 excessive steam adsorption at the oxygen vacancies on CaZrO3 nanoparticles resulted in highly competitive adsorption between steam and methane decreasing CH4 dissociation. The results suggested that in the steam-methane reforming, optimum S/C ratios for the CaZrO3-modified Ni/α-Al2O3 catalysts were relatively lower than those for the unmodified Ni/α-Al2O3 catalyst due to excellent steam adsorption-dissociation capability for CaZrO3 nanoparticles. Elsevier Ltd. 2017 Article PeerReviewed Lertwittayanon, K. and Youravong, W. and Lau, W. J. (2017) Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming. International Journal of Hydrogen Energy, 42 (47). pp. 28254-28265. ISSN 0360-3199 http://dx.doi.org/10.1016/j.ijhydene.2017.09.030 DOI:10.1016/j.ijhydene.2017.09.030 |
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Q Science (General) Lertwittayanon, K. Youravong, W. Lau, W. J. Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming |
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Ni/α-Al2O3 catalysts containing CaZrO3 nanoparticles as a promoter were prepared by sequential impregnation for H2 production from steam-methane reforming. The effects of different loadings of CaZrO3 nanoparticles from 0 to 15 wt% on the catalytic performance of Ni/α-Al2O3 catalysts in steam-methane reforming were studied. The Ni/α-Al2O3 catalysts containing 15 wt% CaZrO3 nanoparticles provided the highest H2 yield due to facilitative steps of enormous steam adsorption-dissociation at the sites of oxygen vacancies on the surface of CaZrO3 nanoparticles. The existence of facilitative steps created additional H+ and OH− enhancing both H2 yield and the gasification of deposited carbon, respectively. The tests of steam-methane reforming at low S/C ratio of 1/3 for 97 h revealed that the catalytic performance of CaZrO3-modified Ni/α-Al2O3 catalysts was higher than that of the unmodified Ni/α-Al2O3 catalyst. Interestingly, at high S/C ratio of 3 excessive steam adsorption at the oxygen vacancies on CaZrO3 nanoparticles resulted in highly competitive adsorption between steam and methane decreasing CH4 dissociation. The results suggested that in the steam-methane reforming, optimum S/C ratios for the CaZrO3-modified Ni/α-Al2O3 catalysts were relatively lower than those for the unmodified Ni/α-Al2O3 catalyst due to excellent steam adsorption-dissociation capability for CaZrO3 nanoparticles. |
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Article |
author |
Lertwittayanon, K. Youravong, W. Lau, W. J. |
author_facet |
Lertwittayanon, K. Youravong, W. Lau, W. J. |
author_sort |
Lertwittayanon, K. |
title |
Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming |
title_short |
Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming |
title_full |
Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming |
title_fullStr |
Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming |
title_full_unstemmed |
Enhanced catalytic performance of Ni/alpha-Al2O3 catalyst modified with CaZrO3 nanoparticles in steam-methane reforming |
title_sort |
enhanced catalytic performance of ni/alpha-al2o3 catalyst modified with cazro3 nanoparticles in steam-methane reforming |
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Elsevier Ltd. |
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2017 |
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http://eprints.utm.my/id/eprint/81290/ http://dx.doi.org/10.1016/j.ijhydene.2017.09.030 |
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1643658666870571008 |
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13.18916 |