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47. One-Pot Catalytic Conversion of Raw Lignocellulosic Biomass into Gasoline Alkanes and Chemicals over LiTaMoO6 and Ru/C in Aqueous Phosphoric Acid

Author

Liu, Yong, Chen, Lungang, Wang, Tiejun, Zhang, Qi, Wang, Chenguang, Yan, Jinyue, Ma, Longlong, Liu, Yong, Chen, Lungang, Wang, Tiejun, Zhang, Qi, Wang, Chenguang, Yan, Jinyue, and Ma, Longlong

Abstract

Lignocellulosic biomass is a renewable feedstock that has the potential to replace the diminishing fossil fuels. Herein, we reported the simultaneous conversion of cellulose, hemicellulose and lignin from raw biomass into gasoline alkanes (hexanes and pentanes) and monophenols and related hydrocarbons over layered LiTaMoO6 and Ru/C in aqueous phosphoric acid medium. Specifically, gasoline alkanes were directly yielded from the carbohydrate components, based on hemicellulose and cellulose, and the total yield could be up to 82.4%. Notably, the lignin fraction could also be transformed into monophenols, related alcohols and hydrocarbons by the one-pot reaction. It suggested that the hydrocracking of monophenol fraction could be performed in this catalytic system. The total yield of volatile products was 53% based on the lignin fraction. In this paper, the influences of phosphoric acid concentration, substrate ash and the amino acids derived from the biogenic impurities were investigated and different raw biomass substrates were tested. Furthermore, the catalysts could be reused for several runs to convert raw biomass without pretreatment., QC 20150917

Published
2015
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48. Process and Techno-economic Analysis of Bio-jet Fuel-range Hydrocarbon Production from Lignocellulosic Biomass Via Aqueous Phase Deconstruction and Catalytic Conversion.

Author

Li, Yuping, Chen, Lungang, Zhang, Xinghua, Zhang, Qi, Wang, Tiejun, Qiu, Songbai, Tan, Jin, Li, Kai, and Ma, Longlong

Abstract

The integrated 1000 tonne/a-scale bio-jet fuel-range hydrocarbon (C 8 -C 15 ) synthesis system via aqueous phase deconstruction and catalytic conversion process was analyzed for its techno-economics of biomass residue utilization. The operation characterization, mass flow and cost in the system were discussed. A two-step deconstruction of corncob, steam stripping and acidic hydrolysis, was designed for the production of the platform chemicals, furfural and levulinic acid from hemicellulose and cellulose respectively. The oxygenate intermediates with the increased carbon chain length was produced by alkali catalyzed aldol condensation from furfural and levulinic acid. The oxygenate intermediates were catalytically converted to jet fuel-range hydrocarbon (C 8 -C 15 ) by the tandem steps of low-temperature hydrogenation, high-temperature hydrodeoxygenation and upgrading over noble metal catalysts. The results indicated that bio-jet fuel yield is 139 kg/h or 8 tonne of dried corncob for 1 tonne fuel production. The operation cost of bio-jet fuel is about $1540/tonne and the cost on corncob, catalytic catalyst and H 2 contributed 23%, 19% and 16% respectively. The cost sensitivity analysis showed that the catalytic lifetime was one of the main factors that affected the economics of bio-jet fuel production, which could increase bio-jet fuel price to $1820/tonne when its lifetime was reduced to 0.5 year. [ABSTRACT FROM AUTHOR]

Published
2016
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50. Aqueous-phase hydrodeoxygenation of propanoic acid over the Ru/ZrO2 and Ru–Mo/ZrO2 catalysts

Author

Chen, Lungang, Zhu, Yulei, Zheng, Hongyan, Zhang, Chenghua, and Li, Yongwang

Subjects
*OXYGENATION (Chemistry), *PROPIONIC acid, *CATALYSTS, *HYDROGEN, *ZIRCONIUM oxide, *PRESSURE
Abstract

Abstract: The conversion of propanoic acid under high hydrogen pressure has been studied over zirconia-supported monometallic Ru and bimetallic Ru–Mo catalysts. The cleavage of C–C bond of propanoic acid to methane and ethane is improved and the formation of Cnation products (propanol and propane) is decreased with increasing the temperature. Upon addition of Mo, both the overall activity and the C–C bond cleavage selectivity decrease while the selectivity of Cnation increases. With increase of Mo contents, the C–C bond cleavage reaction is significantly inhibited, especially at high temperature. This is also confirmed by the DRIFTS of propanoic acid, showing that the propanoyl intermediate species on Ru–Mo bimetal catalysts is more difficult to dissociate to CO compared with Ru monometal catalyst. Based on H2-TPR, CO-FTIR and DRIFTS of propanoic acid characterizations, the reaction mechanisms and the resulting selectivity towards the possible reaction paths (C–C bond cleavage/Cnation) are discussed in terms of the formation of Ru–MoO x and the stability and variety of propanoyl intermediate species occurring on the Ru–Mo bimetal catalysts. It is suggested that the interaction of Ru and MoO x species and the formation of Ru–MoO x interface are the important factors for the decrease in the TOF of propanoic acid and the C–C bond cleavage selectivity. [Copyright &y& Elsevier]

Published
2012
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