摘要
通过浸渍法制备MHZSM-5(M=Fe,Zr,Co)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(XRD)对催化剂的性质进行表征,并在立式两段加热炉上进行纤维素快速热解蒸汽的在线催化实验。对不同催化剂条件下的产物分布特性及生物油组成特性进行分析,结果表明,随着催化剂的引入,液相产率从52.06%最大下降至23.63%,气相产率从42.39%最大提高至70.84%,Co HZSM-5对于热解蒸汽的催化气化效果最为明显;纤维素快速热解生物油中以1,6-脱水-β-D-吡喃葡萄糖(左旋葡聚糖)为主,引入催化剂对纤维素热解蒸汽进行在线催化重整后,产物中芳烃类物质显著增加,以Fe HZSM-5和Zr HZSM-5效果最佳;HZSM-5催化下生物油中左旋葡聚糖的含量提高至63.78%;催化后热解油中乙酸及丙酸含量均减少,但降低幅度有限。综合催化剂对产率及组分的影响效果来看,Fe HZSM-5和Zr HZSM-5对纤维素快速热解蒸汽的催化调控作用较为显著。
The MHZSM-5（M=Fe, Zr and Co） zeolite catalysts prepared by impregnation method were characterized using laser particle size analyzer, specific surface area and pore size analyzer and X-ray diffraction （XRD）, and applied for on-line cracking vapors from cellulose fast pyrolysis with vertical two-stages furnace. The bio-oils obtained by direct liquefaction with and without catalysts were characterized by GC-MS analyses. The results indicated that with introduction of catalysts, liquid yield decreased from 52.06% to 23.63%, while gas yield increased up to 70.84% from 42.39%; and CoHZSM-5 showed the most obvious effect for catalytic pyrolysis. The component of bio-oil from fast pyrolysis of cellulose was mainly 1,6-dehydration-β-D-glucopyranose （levoglucosan）. After the addition of catalysts to online catalytically reform vapors of cellulose fast pyrolysis, the contents of aromatics increased significantly in the product, and FeHZSM-5 and ZrHZSM-5 had the best effect. The content of levoglucosan was increased to 63.78% for HZSM-5 catalyst. The contents of acetic acid and propionic acid were reduced slightly by catalytic pyrolysis. Based on the balance of the yield and composition of bio-oil, it was considered that FeHZSM-5 and ZrHZSM-5 played more significant role during cellulose fast pyrolysis.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第10期4131-4137,共7页
CIESC Journal
基金
国家重点基础研究发展计划项目(2013CB228102)
国家自然科学基金项目(51376075)
公益性行业(农业)科研专项(201303095)~~
关键词
纤维素
分子筛
催化剂
热解
生物油
产物特性
cellulose
moleclar sieves
catalyst
pyrolysis
bio-oil
product property
