生物质焦油模型化合物的催化转化

Catalytic conversion of biomass pyrolysis tar model compound

生物质热解焦油对气化装置及气体运输装置都有极大危害,该文以脂肪烃类化合物正庚烷与环己烷作为焦油的模型化合物,在微型固定床反应器上采用商用Z417镍基催化剂研究了温度、S/C(水蒸气与焦油模型化合物中碳的摩尔比)和试验停留时间对正庚烷与环己烷催化转化率的影响。结果表明,在600～800℃范围内正庚烷与环己烷的转化率随温度的升高而提高,750℃时正庚烷转化率可达到95%,环己烷转化率达到88.7%左右。水蒸气量对于正庚烷和环己烷的转化率有一定的影响,并且可以促进气体产物成分调整与缓解催化剂表面积碳;延长停留时间增加了反应物与催化剂的接触时间,因此正庚烷和环己烷的转化率随停留时间增加而升高。试验结果表明,在水蒸气参与反应条件下,Z417镍基催化剂对生物质焦油模型化合物正庚烷与环己烷的催化效果良好。

Tar from biomass pyrolysis is harmful to the gasification system and gas consuming equipment.For the tar conversion,with n-heptane and cyclohexane as model compounds on a fixed-bed reactor,effects of cracking temperature,S/C and residence time on the tar conversion rate were investigated using nickel-based catalyst.The results showed that the conversion rate of n-heptane and cyclohexane increased with temperature increasing between 600-800℃.The conversion rate of n-heptane reached 95%at 750℃,while the conversion rate of cyclohexane reached 88.7%.Vapor amount had some effects on conversion rate,but it could affect the gaseous composition and alleviate the carbon deposition on the catalyst surface.Contact time between model compound and catalyst was extended with residence time increasing.The conversion rate of n-heptane and cyclohexane increased when the residence time increased.The results show nickel-based catalyst（Z417）has better catalytic effects on model compounds of biomass tar such as n-heptane and cyclohexane.