In this study, fast microwave-assisted catalytic co-pyrolysis of microalgae and scum on HZSM-5 catalyst for bio-oil production was investigated. The effects of co-pyrolysis temperature, catalyst to feed ratio, and microalgae to scum ratio on bio-oil yield and composition were examined. Experimental results show that temperature had great influence on the co-pyrolysis process. The optimal temperature was 550 °C since the maximum bio-oil yield and highest proportion of aromatic hydrocarbons in the bio-oil were obtained at this temperature. The bio-oil yield decreased when catalyst was used, but the production of aromatic hydrocarbons was significantly promoted when the catalyst to feed ratio increased from 1:1 to 2:1. Co-feeding of scum could improve the bio-oil and aromatics production, while the optimal microalgae to scum ratio was 1:2 from the perspective of bio-oil quality. The synergistic effect between microalgae and scum during the co-pyrolysis process became significant only when the effective hydrogen index (EHI) of feedstock was larger than about 0.7.
Bibliographical noteFunding Information:
The authors would like to express their great appreciation to Minnesota Environment and Natural Resources Trust Fund, North Central Regional Sun Grant Center at South Dakota State University through a grant provided by the US Department of Agriculture (2013-38502-21424) and a grant provided by the US Department of Transportation, Office of the Secretary (DTOS59-07-G-00054), and University of Minnesota Center for Biorefining, as well as China Scholarship Council (CSC), High Technology Research and Development Program of China (2012AA021704, 2014AA022002), Beijing Municipal Science and Technology Commission (z141109004414002), International Science and Technology Cooperation Program of China (2014DFA61040), National High-tech R&D Program of China (2012AA021205, 2012AA101809), National Natural Science Foundation of China (21266022) for their financial support for this work.
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- Catalytic co-pyrolysis