The gasification of cellulose has been investigated on Rh catalysts supported on CeO2, ZrO2, Al2O3, TiO2, MgO, and SiO2 at very low temperatures (723-823 K) in a laboratory-scale fluidizedbed reactor using air as a gasifying agent. Of the catalysts, only Rh/CeO2 showed the excellent catalytic performance in the cellulose gasification at above 823 K, resulting in 100% carbon conversion to gas. The details of reaction conditions that affected the performance of the catalyst have been optimized. The best results have been found at above 823 K using the total flow rate of 170 cm3 min-1 of inlet gases. The total carbon conversion was achieved when 50 mg of cellulose was used in a batch. The Rh loading of 1.2 × 10-4 mol (g of catalyst)-1 on CeO2 and W/F of 1.8 gh mol-1 were optima for the total conversion of carbon to gases. Fresh and used catalysts were characterized by a Brunauer-Emmett-Teller (BET) analysis and transmission electron microscopy (TEM). The BET surface area has been decreased from 59 to 24 m2/g during the first batch reaction; however, this value decreased to 21 m2/g during the next 20 batches. No Rh particle was observed in the TEM image of the fresh catalyst; however, in the used catalyst, it was observed, and the particle size was 1.5-2.2 nm on CEO2.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering