On-line catalytic cracking of vapors from cellulose fast pyrolysis

doi:10.11949/j.issn.0438-1157.20150302

Abstract

Abstract:

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.

Key words: cellulose, moleclar sieves, catalyst, pyrolysis, bio-oil, product property

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%,CoHZSM-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FeHZSM-5和ZrHZSM-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,FeHZSM-5和ZrHZSM-5对纤维素快速热解蒸汽的催化调控作用较为显著。

关键词: 纤维素, 分子筛, 催化剂, 热解, 生物油, 产物特性

CLC Number:

TK16

LI Pan, LI Di, SUI Haiqing, SHAO Jing'ai, WANG Xianhua, CHEN Hanping. On-line catalytic cracking of vapors from cellulose fast pyrolysis[J]. CIESC Journal, 2015, 66(10): 4131-4137.

李攀, 李缔, 隋海清, 邵敬爱, 王贤华, 陈汉平. 纤维素快速热解反应气体的在线催化裂解[J]. 化工学报, 2015, 66(10): 4131-4137.

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