(621aa) Sol-Gel-Derived Ni/La2O3-CaO Multifunctional Catalyst for Sorption Enhanced Steam Reforming of Acetic Acid

A series of Ni/La₂O₃-CaO catalysts coupling with absorbents were developed by sol-gel combustion synthesis for sorption enhanced steam reforming of acetic acid. Ni/La₂O₃-CaO (8, 12, 16 and 20wt% NiO) were characterized through N₂ physisorption, X-ray diffraction, SEM-EDX and XPS. Effect of reaction temperature, ratio of H₂O to HAC, WHSV, nickel loading and cycles on performance of Ni-La₂O₃/CaO catalyst were tested in fixed reactor and Ni/La₂O₃-CaO with nickel loading of 12 wt% performs high activity under 650 ºC, 1atm, H₂O/HAC of 3, WHSV of 0.6316 g-acetic acid/g-catalyst. After first cycle, 15 wt% Ni/La₂O₃-CaO reached hyrogen yield of 97.9% and H₂ content of 88.3%(dry basis). After 10 cycles, H₂ content of gas products still stay 89.0% and hydrogen yield reduced to 86.4%. Control of Ni content of the catalyst can reduce CH₄ selectivity while too much Ni content not only droped CaO content off but also decreased nickel dispersion in the catalyst.