不同Si/Al的氢型分子筛催化热解对生物油特性的影响  

Effect of HZSM-5 catalyst with different Si/Al ratios on characterization of pyrolysis bio-oil

作　　者：李攀[1] 王贤华[1] 邵敬爱[1] 杨海平[1] 陈汉平[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《农业工程学报》2014年第20期252-258,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家高技术研究发展计划(863计划)课题(2012AA051803);国家自然科学基金资助项目(51376075);公益性行业(农业)科研专项(201303095)

摘　　要：为考察对于氢型分子筛(HZSM-5)的Si/Al变化和添加量对生物质热解液化的影响,该文通过离子交换法制备HZSM-5催化剂,采用激光粒度分析仪、比表面积及孔径分析仪和X射线衍射仪对催化剂的粒度、孔隙及晶体结构等性质进行表征,并在最佳油产率温度下进行木屑的催化热解。对无催化剂和不同催化条件下得到的生物油进行气相色谱质谱联用分析,结果表明,分子筛作用下,生物油产率明显降低(最大降幅8%),含水率增加。同时,液体产物中醛类、酯类、酮类、呋喃等含氧化合物及酸含量均有所降低,提高了烃类和酚类的含量,峰面积百分比最高达到12.57%和39.36%,对催化剂催化调控改善生物油品质提供了一定的科学依据。In order to investigate the effect on biomass liquefaction of HZSM-5 zeolite under different silica to alumina ratio and adding amounts. The HZSM-5 （hydrogen zeolite） catalysts obtained by ion-exchange method were characterized using laser particle size analyzer, specific surface area and pore size analyzer with Brunauer-Emmett-Teller （BET） method and X-ray diffraction （XRD）, and applied for the catalytic pyrolysis of wood at the optimum temperature of best oil yield. The bio-oils obtained from direct liquefaction with and without catalysts were characterized by GC-MS （Gas Chromatograph-Mass Spectrometer） analyses. The results indicated that： Compared with ZSM-5 zeolite, the crystal grain size of HZSM-5 zeolite prepared through ion exchange increased, and the particle size distribution was more concentrated, andthe catalyst had a preferable crystalline tacticity and a increased crystallinity, meanwhile, the surface area and the pore volume of HZSM-5 catalyst decreased, while pore size did not change significantly. When the HZSM-5 zeolite of different silica to alumina ratio were applied to pyrolysis, the yield of bio-oil decreased significantly （the maximum was up to 8%）, the moisture content of the bio-oil increased. However, the composition of bio-oil and the relative content of the product changed a lot, it indicated that there was obvious catalytic effects during the direct liquefaction of biomass under HZSM-5 zeolite. Compared with non-catalyst pyrolysis, the contents of aldehydes, esters, ketones, furans and acid （oxygenated compounds） were reduced. It showed that HZSM-5 zeolite promoted a series of decarboxylation, decarbonylation reaction during the pyrolysis process, resulted to the reduction of the oxygen content of bio-oil and helped to improve the stability of bio-oil. With the increasing of silica to alumina ratio, the catalytic activity weakened a little. When the adding amounts of HZSM-5 zeolite were increased, a small variation of the yield of bio-oil occured, the moistur

关 键 词：生物质 热解 催化剂 产物特性 

分 类 号：TK16[动力工程及工程热物理—热能工程]