低温等离子放电与催化剂结合方式对生物油提质的影响

为提高生物油的提质效率,在HZSM-5及Ti/HZSM-5催化的基础上引入低温等离子体技术,分析等离子体协同催化(PSC)和等离子体增强催化(PEC)等不同结合方式对精制生物油产率、理化特性、化学组成及催化剂稳定性的影响。结果表明,Ti改性和等离子体放电使精制生物油产率逐渐降低,Ti/HZSM-5(PEC)催化所得精制生物油产率较低,生物油质量分数为13. 84%,但烃类物质的分布得到明显改善;而Ti/HZSM-5(PSC)催化所得精制生物油中烃类总含量略低,但高氢碳比产物相对含量达68. 89%,理化特性较优,高位热值达到36. 52 MJ/kg; PSC方法等离子体对催化剂表面的冲击作用较强,使催化剂结焦量相对较低,Ti/HZSM-5(PSC)的结焦量较低,积分面积仅为5. 24%,催化稳定性较高。综合而言,基于Ti/HZSM-5的催化作用,PSC方法优于PEC方法。

Effect of Compound Modes of Plasma Discharge and Catalysts on Bio-oil Upgrading

In order to effectively improve the bio-oil upgrading efficiency, the non-thermal plasma technology was introduced to conduct the online upgrading of bio-oil based on the HZSM-5 and Ti/HZSM-5 catalysis. The effects of different compound modes, including the plasma synergistic catalysis (PSC) and the plasma enhanced catalysis (PEC), on the refined bio-oil yields, physicochemical properties, compositions and catalyst stability were investigated in detail. The results showed that the production of refined bio-oil was gradually decreased with the introduction of Ti ions and plasma-discharge technology, in which the yield of refined bio-oil obtained from Ti/HZSM-5(PEC) catalysis was only 13.84%, but the distribution of hydrocarbons was obviously improved. In comparison, the total hydrocarbon content in the refined bio-oil obtained from Ti/HZSM-5(PSC) catalysis was slightly lower, but the product ratio with higher ratio of hydrogen to carbon was high as 68.89%, so its physicochemical properties were better and the high heating value was up to 36.52MJ/kg. In the PSC method, the impact of plasma on the surface of catalyst was stronger, which made the coking rate of catalyst relatively low, so the coking content of Ti/HZSM-5 employed in the PSC method was the lowest (integral area of 5.24%) and the catalytic stability was the highest. In general, the PSC method was superior to the PEC method based on the catalytic action of Ti/HZSM-5.