期刊
CATALYSTS
卷 12, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/catal12121526
关键词
hydrogen production; oxidative reforming; catalysis; SBA-15; mesoporous ceria; nanocasting
资金
- Community of Madrid [M2743]
- Rey Juan Carlos University [PID2020-117273RB-I00]
- Spanish Ministry for Science and Innovation
- [S2018/EMT-4344]
By adjusting the O-2/AcOH molar ratio in the Ni/CeO2 catalyst, higher acetic acid conversion and hydrogen yield can be achieved with reduced coke deposition. The mesostructured Ni/CeO2 catalyst exhibits the best catalytic performance and the lowest coke formation.
Oxidative steam reforming allows higher energy efficiency and lowers coke deposition compared to traditional steam reforming. In this work, CeO2-based supports have been prepared with Ni as the active phase, and they were tested in the oxidative steam reforming of acetic acid. The influence of the O-2/AcOH molar ratio (0-0.3) has been evaluated over Ni/CeO2. The results stated that by increasing oxygen content in the feeding mixture, acetic acid conversion increases, too, with a decrease in coke deposition and hydrogen yield. To have a proper balance between the acetic acid conversion and the hydrogen yield, an O-2/AcOH molar ratio of 0.075 was selected to study the catalytic performance of Ni catalysts over different supports: commercial CeO2, a novel mesostructured CeO2, and CeO2-SBA-15. Due to higher Ni dispersion over the support, the mesostructured catalysts allowed higher acetic acid conversion and hydrogen yield compared to the nonporous Ni/CeO2. The best catalytic performance and the lowest coke formation (120.6 mg(coke)center dot g(cat)(-1)center dot h(-1)) were obtained with the mesostructured Ni/CeO2. This sample reached almost complete conversion (>97%) at 500 degrees C, maintaining the hydrogen yield over 51.5% after 5 h TOS, being close to the predicted value by the thermodynamic equilibrium that is due to the synergistic coordination between Ni and CeO2 particles.
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