Abstract
We synthesized cerium-doped cobalt-alumina (CoxCey/Al2O3) catalysts for the propane steam reforming (PSR) reaction. Adding cerium introduces oxygen vacancies, and the oxygen transfer capacity of the Ce promoter favors CO to CO2 conversion during PSR, inhibiting coke deposition and promoting hydrogen production. The best PSR activity was achieved at 700 °C using the Co0.85Ce0.15/Al2O3 catalyst, which showed 100% propane (C3H8) conversion and about 75% H2 selectivity, and 6% CO, 5% CO2, and 4% CH4 were obtained. In contrast, the H2 selectivity of the base catalyst, Co/Al2O3, is 64%. The origin of the difference in activity was the lower C3H8 gas desorption temperature of the Co0.85Ce0.15/Al2O3 catalyst compared to that of the Co/Al2O3 catalyst; thus, the PSR occurred at low temperatures. Furthermore, more CO was adsorbed on the Co0.85Ce0.15/Al2O3 catalyst, and subsequently, desorbed as CO2. The activation energy for water desorption from the Co0.85Ce0.15/Al2O3 catalyst was 266.96 kJ/mol, higher than that from Co/Al2O3. Furthermore, the water introduced during the reaction probably reacted with CO on the Co0.85Ce0.15/Al2O3 catalyst, increasing CO2 generation. Finally, we propose a mechanism involving the Co0.85Ce0.15/Al2O3 catalyst, wherein propane is reformed on CoxCey sites, forming H2, and CO, followed by the conversion of CO to CO2 by water on CeO2 sites.
Highlights
At the Davos World Economic Forum in January 2017, a hydrogen consortium was formed consisting of chief executive officers from major companies in Asia, Europe, and the United States of America, as well as national policy makers
We have shown that, in the Co/Mn catalyst, the oxygen vacancies of the manganese oxides are well supplied with oxygen for the reforming of propane on the cobalt sites, enabling the reforming reaction to occur continuously
The aim of this study is to suppress the deterioration of the catalyst by converting the CO gas generated during the propane steam reforming (PSR) reaction to CO2 by using the lattice oxygen of Cex Oy, which was used as a promoter to achieve higher hydrogen production over the Co-based catalyst
Summary
At the Davos World Economic Forum in January 2017, a hydrogen consortium was formed consisting of chief executive officers from major companies in Asia, Europe, and the United States of America, as well as national policy makers. At the Sustainability Innovation Forum in November 2017, the hydrogen consortium predicted that the demand for hydrogen fuel cell vehicles would increase from 10 to 15 million cars by 2030 and to 500,000 trucks by 2030. The demand for hydrogen is expected to expand to 10 times its current level because of its wide use in other industries [1]. The era of the hydrogen economy has arrived. The increasing use of hydrogen energy will help protect the environment, it may not represent the next-generation energy revolution
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