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Abstract: Aqueous-phase reforming (APR) of the low-boiling fraction (LBF) of bio-oil from rice husk pyrolysis was investigated over Pt/Al2O3 for hydrogen production. The influence of reaction temperature (503–563K), reaction time (1–4h), different load of organics in water (3–12wt.%) and catalyst amounts (0.25–1g) were studied. The hydrogen content of the gas products reached 65vol.% at 533K for 4h with a feedstock of 9.6g LBF and 30mL water in the presence of 0.5g of 2wt.% Pt/Al2O3. APR is a promising method to make use of the organics in LBF of bio-oil to produce hydrogen. [Copyright &y& Elsevier]

Abstract: In this work, the upgrading reactions of high-boiling fraction (HBF) of bio-oil were carried out over a series of supported mono- and bi-metallic catalysts under the supercritical methanol condition. During these reactions, esterification and cracking (alcoholysis and hydrocracking) were the two dominant processes. PtNi/MgO exhibited good performance, and gave a high yield (72.4wt.%) of refined oil. The acid–base properties of the supports have an important effect on the coke deposition on the catalyst surface. The acidic catalysts gave the somewhat lower product yields, but tended to inhibit coking reaction. This would improve the life of the catalysts in the practical applications. The refined oil is believed to be a potential substitute or partial substitute for the fossil transportation fuel. [Copyright &y& Elsevier]

Abstract: In this work, the low-boiling fraction (LBF) of bio-oil was used as feed stock. LBF is a very complex mixture, and the three groups in LBF: acids, aldehydes and phenols, are primarily responsible for deterioration in the quality. The upgrading reactions were carried out over Pt/Al2(SiO3)3, Pt/C or Pt/MgO in supercritical methanol. It is demonstrated that supercritical condition can greatly facilitate the esterification process, and after 6h reaction, all the acids can be converted into esters even without adding any catalyst. The total amount of the three groups left in products was much less exhibited on Pt supported on active carbon and MgO in the presence of hydrogen. By investigating the model reactions, the relations between the representative compounds and major products were identified, and the conversion scheme of the upgrading reactions is proposed. [Copyright &y& Elsevier]