纤维素催化热解定向调控制取不含氧烃类液体燃料

为了将生物质能高效转化为高品位不含氧的液体燃料,以纤维素为例,研究了以催化热解方式将热解产物转化为芳香烃类液体燃料的过程.实验发现,纤维素热解产生的含氧有机小分子,可以通过催化热解的形式高效转化为不含氧的芳香烃类液体.催化剂采用HZSM-5(23)、催化剂原料质量比例为5∶1、热解温度为650℃、升温速率为10000 K/s的工况为纤维素催化热解的最佳工况,单环芳烃、多环芳烃产率分别为9.90%和12.91%,总芳香烃类产率为22.81%.热解温度提升至650℃前,更高的热解温度能获得更高的芳香烃产率.继续提高热解温度,单环芳烃、多环芳烃分子间还可能进一步发生聚合反应,最终产生积碳.同时本文也提出了一种可行的纤维素催化热解中的反应途径,与本文实验结果较为匹配.

Catalytic Pyrolysis of Cellulose to Produce Non-Oxygenated Hydrocarbon Liquid Fuel

In order to efficiently convert biomass energy into high-grade liquid fuel without oxygen,the process of converting pyrolysis products into aromatic hydrocarbon liquid fuel by catalytic pyrolysis was studied with cellulose as an example.The experimental results showed that small oxygenates produced by cellulose fast pyrolysis can be efficiently converted into non-oxygenated aromatic hydrocarbon liquids through catalytic pyrolysis.The optimum conditions for cellulose catalytic pyrolysis were HZSM-5(23),a catalyst feed ratio of 5∶1,a pyrolysis temperature of 650℃and a heating rate of 10000 K/s.The yields of monocyclic and paracyclic aromatic hydrocarbons were 9.90%and 12.91%,respectively.The total yield of aromatic hydrocarbons was 22.81%.Before the pyrolysis temperature rose to 650℃,higher pyrolysis temperature can obtain higher yield of aromatic hydrocarbons.Further increase of pyrolysis temperature may lead to further polymerization of monocyclic and paracyclic aromatic hydrocarbons,resulting in carbon deposition.At the same time,a feasible reaction pathway for cellulose catalytic pyrolysis was proposed,which was in good agreement with the experimental results obtained in this paper.