催化生物质焦油模型化合物热解规律的研究

Study on pyrolysis law of catalytic biomass tar model compounds

为进一步开发可再生能源,探究了生物质焦油的催化转化路径。试验以分子筛为载体制备了Ni基分子筛催化剂,对生物质焦油相关模型化合物进行催化热解研究,考察了不同催化剂以及热解温度的影响。结果表明,Ni的负载很大程度上提高了催化剂的催化活性,促进了催化反应向气体产物方向进行;随着助剂金属Ca,Co的二次负载,金属间的相互作用进一步提高了催化剂的机械强度和反应稳定性。通过对热解温度的研究,发现随着温度升高,模型物转化率和热解气产率显著提高,高温促进了催化剂与模型物间的氢转移反应。各模型化合物在Ni-CaCo/HZSM-5的催化作用下,均可以从大分子有机物转化为小分子气体,其转化率可以达到90%以上。研究旨在为进一步深入研究焦油的催化转化奠定基础。

In order to expand the utilization of renewable energy,the catalytic conversion of biomass tar is explored.Nickel-based molecular sieve catalysts were prepared by using molecular sieve as the carrier.The effects of different catalysts and pyrolysis temperature on the catalytic pyrolysis of biomass tar model compounds were investigated.The results showed that Ni loading greatly increased the catalytic activity of the catalyst and promoted the gas product yield from the catalytic reaction.With the secondary loading of auxiliaries Ca and Co,the metal-metal interaction further improved the mechanical strength and reaction stability of the catalyst.Through the study on pyrolysis temperature,it was found that with the increase of temperature,the conversion rate and the pyrolysis gas yield of the model increased significantly.The high temperature promoted the hydrogen transfer reaction between the catalyst and the model.Catalyzed by Ni‒Ca‒Co/HZSM‒5,the model compound can be converted from macro-molecular organic matter to small molecular gas,and the conversion rate reached more than 90%.The study lays a solid foundation for further study on biomass tar catalytic transformation.