利用浸渍法制备Cu、Fe、Co和Ni元素改性的MCM-41介孔分子筛催化剂,并对改性后的催化剂进行X射线衍射（XRD）和比表面积（BET）表征分析,探究不同金属改性催化剂的物理化学结构等特性。通过热重-傅里叶变换红外光谱联用（TG-FTIR）、热解-气相色谱/质谱联用（Py-GC/MS）等实验体系探究对催化共热解中纤维素及木质素与聚丙烯（PP）间协同反应及热解产物分布的影响。结果表明,在MCM-41的催化共热解中,MCM-41可促进生物质与PP之间的相互反应,芳烃和轻烃产率增加。相比MCM-41,改性MCM-41可促进轻烯烃、C5~C11脂肪烃和芳烃的析出。Cu、Fe和Co改性可促进单环芳烃的形成。相较于MCM-41,MP-M/Fe中烯烃析出占比最高,达到59.68%; XP-M/Fe中轻质烯烃析出占比最高,达到32.84%; XP-M/Co中烷烃析出占比最高,达到34.22%; 其他各组烯烃烷烃在热解产物析出占比中均有提高。
Abstract
In this paper, MCM-41 mesoporous molecular sieve catalysts modified by Cu, Fe, Co and Ni elements were prepared by impregnation method. XRD and BET characterization analyses were carried out on the modified catalysts to explore the physicochemical structures and other characteristics of catalysts modified by different metals.The effects of co-pyrolysis of cellulose, lignin and polypropylene （PP） on the synergistic reaction and the distribution of pyrolysis products were investigated by TG-FTIR and Py-GC/MS. The results show that MCM-41 can promote the reaction between biomass and PP, and the yields of aromatics and light hydrocarbons are increased. Compared with MCM-41, modified MCM-41 can promote the precipitation of light olefins, C5~C11 aliphatic hydrocarbons and aromatics. Cu, Fe and Co modification can promote the formation of monocyclic aromatics. Compared with MCM-41, MP-M/Fe has the highest proportion of olefin precipitation, reaching 59.68%, and XP-M/Fe has the highest proportion of light olefin precipitation, reaching 32.84%. XP-M/Co has the highest proportion of alkane precipitation, reaching 34.22%. The proportion of other groups of alkenes and alkanes in the pyrolysis products increases.
关键词
生物质 /
热解 /
聚丙烯 /
金属改性MCM-41 /
生物油 /
产物分布 /
表征
Key words
biomass /
pyrolysis /
polypropylenes /
metal modified MCM-41 /
bio-oil /
product distribution /
characterization
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