DOI number:10.1016/j.enconman.2019.06.047
Affiliation of Author(s):中南大学
Journal:Energy Conversion and Management
Key Words:Carbon deposit; Catalytic cracking; Hydrotalcite-derived catalysts; Toluene
Abstract:Ni-Mg-Al hydrotalcite-derived materials promoted with Ce, Zr or Fe were prepared by the co-precipitation method, which exhibited excellent performance in steam reforming of toluene (SRT) at low temperature. Especially, Fe-doped catalyst had higher catalytic activity and stability at 400 °C, which maintained almost 100% toluene conversion during the SRT reaction (3 h). Moreover, it also had higher hydrogen production and better selectivity for hydrogen production. The physico-chemical characterizations and model simulation indicate its high dispersion of active sites and accessibility of reactants to active sites: uniform dispersion of active sites (SEM, TEM and EDX), large specific surface area (151 m2/g), pore volume (0.84 cm3/g) and average pore diameter (22.1 nm), small crystallite size (34.9 nm), desirable Ni species reducibility (TPR), high basicity (TPD), low metal carbide formation (XPS), and good adsorption affinity with toluene (−18.391 kJ mol−1, DFT). Moreover, less carbon was deposited on the Fe-containing catalyst through measuring the amorphous carbon and CNTs by the TG-MS method, which was due to the tip-growth mechanism of CNTs. Considering lower toluene conversion temperature, higher hydrogen yield, and better resistance to carbon deposition, this study may be meaningful in development of SRT at low temperature.
Indexed by:Journal paper
Volume:196
Page Number:677 - 687
ISSN No.:01968904
Translation or Not:no
Date of Publication:2019-09-15
Included Journals:SCI
Links to published journals:https://www.sciencedirect.com/science/article/pii/S0196890419307186?via%3Dihub