title: Catalytic hydrothermal upgrading of crude bio-oils produced from different thermo-chemical conversion routes of microalgae.
abstract: This study presents experimental results that compare the use of hydrothermal liquefaction (HTL), alcoholysis (Al), pyrolysis (Py) and hydropyrolysis (HPy) for the production of bio-oil from a microalga (Chlorella pyrenoidosa) and the catalytic hydrothermal upgrading of crude bio-oils produced by these four conversion routes. The yields and compositions of bio-oil, solid residue, and gases were evaluated and compared. HTL resulted in a bio-oil that has a higher energy density and superior fuel properties, such as thermal and storage stabilities, compared with the other three conversion routes. The N in crude bio-oils produced from Py and HPy is more easily removed than that in the bio-oils produced from HTL and Al. The upgraded bio-oils contain reduced amounts of certain O-containing and N-containing compounds and significantly increased saturated hydrocarbon contents. All of the upgraded bio-oils have a larger fraction boiling below 350°C than their corresponding crude bio-oils.
authors: College of Physics and Chemistry, Department of Applied Chemistry, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan 454003, PR China; Opening Laboratory of Alternative Energy Technologies, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan 454003, PR China. Electronic address: pgduan@hpu.edu.cn.
authors: Peigao
authors: P
authors: Duan
authors: College of Physics and Chemistry, Department of Applied Chemistry, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan 454003, PR China; Opening Laboratory of Alternative Energy Technologies, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan 454003, PR China.
authors: Bing
authors: B
authors: Wang
authors: College of Physics and Chemistry, Department of Applied Chemistry, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan 454003, PR China; Opening Laboratory of Alternative Energy Technologies, Henan Polytechnic University, No. 2001, Century Avenue, Jiaozuo, Henan 454003, PR China.
authors: Yuping
authors: Y
authors: Xu
mesh_terms: D056804:Biofuels / Q000032:analysis*; D018533:Biomass; D002384:Catalysis; D002708:Chlorella / Q000378:metabolism; D005740:Gases / Q000378:metabolism; D006838:Hydrocarbons / Q000378:metabolism; D058086:Microalgae / Q000378:metabolism*; D010578:Petroleum / Q000378:metabolism*; D013696:Temperature
chemical_list: D056804:Biofuels; D005740:Gases; D006838:Hydrocarbons; D010578:Petroleum
keywords: Alcoholysis; Hydropyrolysis; Hydrothermal liquefaction; Pyrolysis; Upgrading