Effect of Hydrocarbon Structure on Steam Reforming over Ni/perovskite Catalyst

Abstract

Ni/perovskite-type oxide catalyst (Ni/La0.7Sr0.3AlO2.85: LSAO) shows high catalytic activity and low carbon formation during the steam reforming of aromatic hydrocarbons because of the high mobility of lattice oxygen in the support. The reaction mechanisms of the catalyst were investigated by characterizations and catalytic activity tests for steam reforming of various hydrocarbons including toluene, methylcyclohexane, and n-heptane. The catalytic performance was affected by the reactant structure, as revealed by Arrhenius plots and FT-IR analyses. Adsorption state and stability of reaction intermediates were very important factors in the catalytic activity for steam reforming.

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

“…Consequently, the rate of NO reduction by C x H y O z also decreases because the formation rate of C x H y O z decreases. Sr 0.3 AlO 3Àd ),26,27 we reported that hydrocarbons were oxidized by the lattice oxygen of La 0.7 Sr 0.3 -AlO 3Àd . The lattice oxygen of La 0.7 Sr 0.3 AlO 3Àd , having high mobility, can contribute to the surface reaction via release and restoration.…”

“…15,20,23,24 Results have shown that the lattice oxygen reacts with various hydrocarbons to form partially oxidized hydrocarbon species (C x H y O z : oxygenated species) on Sr-substituted LaAlO 3 . [25][26][27] Oxygenated species reacted with H 2 O as reductants to form H 2 . Then the lattice oxygen consumed is restored by H 2 O in atmosphere.…”