Catalytic conversion of a wood-derived oil to fuels and chemicals: Effect of process conditions and catalysts
- Univ. of Saskatchewan, Saskatoon (Canada)
The effect of run-time, temperature and catalyst regeneration on the upgrading of a bio-oil produced by the high pressure liquefaction of aspen poplar wood were studied in the presence and absence of steam. The bio-oil was processed with HZSM-5 catalyst in a 12.7 mm ID fixed bed micro-reactor at 3.6 WHSV, 1 atm and a temperature range of 290--410{degrees}C. The products, which included coke, residue, aqueous fraction, gas and organic distillate were strong functions of the reaction temperature and process time. The objective was to optimize the amount of organic distillate and yield of hydrocarbons, and to minimize coke formation. Without steam, the amount of the organic distillate was maximum 59 wt % at 390{degrees}C and contained 65 wt % aromatic hydrocarbons. Alkylated benzenes within the gasoline boiling point range and a number of phenols were the major constituents. With steam, 3--18 wt % increase in organic distillate and 30--45 wt % reduction in coke were obtained. Also, processing only the volatile portion of the bio-oil yielded an even higher hydrocarbon-rich organic distillate. The spent catalyst was easily regenerated and reused four times with little change in its performance. Upgrading studies were also carried out with silicalite, H-mordenite, H-Y and silica-alumina catalysts. The effect of temperature on the organic distillate and hydrocarbon yields were studied. The hydrocarbon yields increased with temperature and were up to 22.1 wt % for silicalite, 27.5 wt % for H-mordenite, 21.0 wt % for H-Y, and 26.2 wt % for silica-alumina at 410{degrees}C. The nature and distribution of hydrocarbons depended on the catalyst pore size, acidity and shape selectivity. To understand the reactions involved in upgrading the bio-oil, model compound studies were carried out. A reaction pathway based on these studies is presented.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- OSTI ID:
- 140231
- Report Number(s):
- NREL/CP-200-5768-Vol.2; CONF-9308106-Vol.2; ON: DE94000435; TRN: 93:003832-0035
- Resource Relation:
- Conference: 1. biomass conference of the Americas: energy, environment, agriculture, and industry, Burlington, VT (United States), 30 Aug - 2 Sep 1993; Other Information: PBD: [1993]; Related Information: Is Part Of First Biomass Conference of the Americas: Energy, environment, agriculture, and industry; Proceedings, Volume 2; PB: 711 p.
- Country of Publication:
- United States
- Language:
- English
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