Selective catalytic conversion of bio-oil over high-silica zeolites

Abstract

Four high silica zeolites, i.e., HSZ-385, 890, 960, and 990 were utilized for the selective catalytic conversion of bio-oil from Fallopia japonica to certain chemicals in a fixed-bed reactor. The Beta-type HSZ-960 zeolite showed the highest selectivity to hydrocarbons, especially to aromatics as well as PAH compounds with the lowest unwanted chemicals while HSZ-890 showed high selectivity to aromatics. NH3-Temperature Programmed Desorption (TPD) analysis indicated that different amounts of acid sites in different zeolites determined the catalytic activity for the oxygen removal from bio-oil, in which the acid sites at low temperature (LT) region gave more contribution within the utilized temperature region. The reusability test of HSZ-960 showed the stability of hydrocarbons yield at higher temperature due to the significant contribution of coke gasification which assisted further deoxygenation of bio-oil. These results provide a guidance to select suitable zeolite catalysts for the upgrading of bio-oil in a practical process.

Upgrading of bio-oil from biomass pyrolysis over Cu-modified β-zeolite catalyst with high selectivity and stability

“…This method mimics the process of fluid catalytic cracking of crude oil by using zeolites. To date, various zeolites have been tried to upgrade bio-oils [15][16][17][18][19]. Lee et al found that HZSM-5 zeolite can selectively convert oxygenates species in the bio-oil to aromatics compounds due to its small pore opening and strong acidity.…”

In situ fast pyrolysis of biomass with zeolite catalysts for bioaromatics/gasoline production: A review

“…Therefore, the impregnation method was shown to be a poor catalyst design with respect to aromatization performance. Widayatno et al [159] explored the performance of some Beta-type zeolites for Fallopia japonica upgrading at 500°C, using 2:0.6 weight ratio of catalyst to biomass. The H-SZ-890 catalyst produced the highest yield of aromatics (30%) with the lowest yield of oxygenates (40%).…”

Enhancement of biomass conversion in catalytic fast pyrolysis by microwave-assisted formic acid pretreatment

“…S6). These aromatic hydrocarbons have much higher energy density and stability than the oxygenated products in non-CFP, and can be directly used as transportation fuels or commercial chemicals (Huber et al, 2006;Widayatno et al, 2015). CFP of biomass with zeolites thus provides an effective way to rapidly convert solid biomass feedstocks into highly valuable liquid products.…”

“…While CFP can rapidly convert biomass to aromatics, its carbon efficiency has yet to be improved to make the conversion process more economically competitive (Lazdovica et al, 2016;Li et al, 2013Li et al, , 2015Widayatno et al, 2015). It is well-known that natural lignocellulosic biomass consists of three major components, i.e., cellulose (40-50 wt.%), hemicellulose (25-35 wt.%), and lignin (15-20 wt.%) (Alonso et al, 2010;Huber et al, 2006).…”