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This work aimed to develop an in-situ upgrading process for production of refined bio-oil from primary biomass pyrolysis vapors. The phosphorus, zinc and titanium modified HZSM-5 were developed and first employed in the process. The yield of refined bio-oil was in the range of 17.85–19.97% along with low oxygen content (18.06–20.04%), high pH value (4.96–5.02), low dynamic viscosity (5.85–6.02 mm2...
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