TY - JOUR
T1 - In situ IR study for elucidating reaction mechanism of toluene steam reforming over Ni/La0.7Sr0.3AlO3-δ catalyst
AU - Mukai, Daiki
AU - Murai, Yuki
AU - Higo, Takuma
AU - Tochiya, Satoshi
AU - Hashimoto, Takashi
AU - Sugiura, Yukihiro
AU - Sekine, Yasushi
PY - 2013/8/9
Y1 - 2013/8/9
N2 - Steam reforming of toluene as a model compound of biomass tar was conducted on supported Ni catalysts. The Ni catalyst supported on perovskite oxide (La0.7Sr0.3AlO3-δ: LSAO) showed the highest toluene conversion (58%) and lowest coke formation (57 mg g-cat -1) at 873 K thanks to the smaller Ni particle size and larger perimeter between Ni and perovskite support, confirmed by XRD, BET, STEM and XAFS. In this paper, adsorption of toluene on Ni/LSAO catalyst was investigated using FT-IR method to estimate the reaction mechanism. IR spectra during temperature programmed desorption revealed that strong adsorption of toluene was observed only on LSAO and Ni/LSAO. The decomposition of adsorbate to CO or CO2 was promoted by supported Ni metal. Lattice oxygen of perovskite support contributed to the oxidation of the intermediate at the interface of Ni and perovskite. In addition, the oxidation of intermediate was promoted by introducing steam. Investigating adsorptions of various probe molecules (benzene, n-heptane, ethylene and benzaldeyde) revealed that decomposition of aromatic ring proceeded on Ni/LSAO.
AB - Steam reforming of toluene as a model compound of biomass tar was conducted on supported Ni catalysts. The Ni catalyst supported on perovskite oxide (La0.7Sr0.3AlO3-δ: LSAO) showed the highest toluene conversion (58%) and lowest coke formation (57 mg g-cat -1) at 873 K thanks to the smaller Ni particle size and larger perimeter between Ni and perovskite support, confirmed by XRD, BET, STEM and XAFS. In this paper, adsorption of toluene on Ni/LSAO catalyst was investigated using FT-IR method to estimate the reaction mechanism. IR spectra during temperature programmed desorption revealed that strong adsorption of toluene was observed only on LSAO and Ni/LSAO. The decomposition of adsorbate to CO or CO2 was promoted by supported Ni metal. Lattice oxygen of perovskite support contributed to the oxidation of the intermediate at the interface of Ni and perovskite. In addition, the oxidation of intermediate was promoted by introducing steam. Investigating adsorptions of various probe molecules (benzene, n-heptane, ethylene and benzaldeyde) revealed that decomposition of aromatic ring proceeded on Ni/LSAO.
KW - Adsorbed species
KW - FT-IR
KW - Ni catalyst
KW - Perovskite support
KW - Steam reforming of toluene
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U2 - 10.1016/j.apcata.2013.06.052
DO - 10.1016/j.apcata.2013.06.052
M3 - Article
AN - SCOPUS:84881089152
VL - 466
SP - 190
EP - 197
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -