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Preparation of refined bio-oil by catalytic transformation of vapors derived from vacuum pyrolysis of rape straw over modified HZSM-5

Cai, Yixi, Fan, Yongsheng, Li, Xiaohua, Chen, Lei, Wang, Jiajun
Energy 2016 v.102 pp. 95-105
biofuels, biomass, catalysts, combustion, heat, lignocellulose, oxygen, pH, phosphorus, pyrolysis, straw, titanium, vapors, viscosity, zinc
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/s), high HHV (higher heating value) (32.70–33.98 MJ/kg) and high hydrocarbon content. However, the composition of hydrocarbon varied with modified elements, so the catalytic mechanism of modified HZSM-5 was discussed. Simultaneously, anti-coking performance of modified catalyst was investigated to evaluate sustainability of the process. This work demonstrated that the refined bio-oil produced in this study basically met the technical requirements of combustion in power machinery, which provided a useful way to utilize renewable lignocellulose biomass. Though anti-coking capability of modified HZSM-5 was enhanced, coke deposition still hindered the continuous production of refined bio-oil to a certain extent.