减压蒸馏生物油与乙醇在ZSM-5/MCM-41上共催化裂化

Catalytic co-cracking of reduced pressure distillation of bio-oil and ethanol over ZSM-5/MCM-41

采用减压蒸馏生物油为原料,与无水乙醇2∶3(质量比)混合,在固定床中ZSM-5/MCM-41分子筛上共催化裂化,考查了反应温度和质量空速(WHSV)对裂化产物的影响。对ZSM-5/MCM-41进行了NH3-TPD、BET、N2吸附-脱附等表征,对裂化气体产物通过气相色谱仪分析,减压蒸馏生物油和精制生物油采用气相色谱-质谱联用仪进行定量分析。结果表明,反应温度500℃、WHSV 3.75 h-1为反应优化工况。此反应条件下,精制生物油酸类物质从减压蒸馏生物油中的25.6%降至反应后的0.1%,效果显著,且精制生物油产率为46.8%,气体产物中CO2和CO的浓度共9.5%。

The reduced pressure distillation of bio-oil and the ethanol with the mixing ratio of 2：3 by weight were subjected to catalytic co-cracking over ZSM-5/MCM-41 molecular sieve in a fixed-bed reactor.The effects of reaction temperature and WHSV on cracking products were investigated.The catalyst is characterized by NH3-TPD,BET,N2 adsorption and desorption.The gaseous products were analyzed by gas chromatograph,and reduced pressure distillation of bio-oil and the upgraded bio-oil were quantified by gas chromatograph-mass spectrometry.It is found that the optimum conditions for the upgrading of bio-oil are 500 ℃ of the reaction temperature and 3.75 h of the WHSV,under which the acid substance in upgraded bio-oil is markedly reduced from 25.6%in reduced pressure distillation of bio-oil to 0.1%after upgrading.Meanwhile,the yield of upgraded bio-oil is 46.8%,and the concentration of CO2 and CO in the gaseous products is 9.5%.