Lignin-Mediated Preparation of Hierarchical ZSM-5 Catalysts and Their Effects in the Catalytic Co-pyrolysis of Softwood Biomass and Low-Density Polyethylene Mixtures,ACS Sustainable Chemistry & Engineering

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Lignin-Mediated Preparation of Hierarchical ZSM-5 Catalysts and Their Effects in the Catalytic Co-pyrolysis of Softwood Biomass and Low-Density Polyethylene Mixtures
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-09-03 , DOI: 10.1021/acssuschemeng.1c03863
Moriko Qian ₁ , Hanwu Lei ₁ , Yunfeng Zhao _{1,

2} , Elmar Villota _{1,

3} , Erguang Huo _{1,

4} , Chenxi Wang ₁ , Xuesong Zhang ₅

Affiliation

Biomass-mediated modification in zeolite synthesis has outstanding potential in directing new porous structures and improved catalyst properties. This study reports the preparation of hierarchical ZSM-5 catalysts by a successive treatment of desilication and lignin-mediated reassembly. The changes in physicochemical properties of the hierarchical ZSM-5 including crystallinity, porosity, acidity, and morphology were characterized by foreseeing the application of lignin as a green template. The hierarchical pore system containing moderately strengthened acidity was directed with 1 wt % lignin addition, which attained more desirable products and less solid residue than the microporous ZSM-5. The catalytic conversion of biomass and plastic feedstocks was performed using analytical and bench-scale reactor systems to evaluate desired mixtures and product distribution. It was found that the surface and intracrystalline mesopores in hierarchical ZSM-5 were beneficial for the conversion of macromolecules, such as aromatic oxygenates and long-chain hydrocarbons. While the plastic-derived olefins synergistically interacted with the biomass derivatives within the pyrolytic vapor, the hierarchical structure extended reactant accessibility from the catalyst surface into the microporous channels and internal acid sites.

中文翻译：

木质素介导的多级 ZSM-5 催化剂的制备及其在软木生物质和低密度聚乙烯混合物催化共热解中的作用

沸石合成中生物质介导的改性在引导新的多孔结构和改进催化剂性能方面具有突出的潜力。本研究报告了通过连续处理脱硅和木质素介导的重组来制备分级 ZSM-5 催化剂。通过预见木质素作为绿色模板的应用，表征了分级 ZSM-5 的物理化学性质的变化，包括结晶度、孔隙度、酸度和形态。含有中等强度酸度的分级孔隙系统以 1 wt% 的木质素添加为导向，与微孔 ZSM-5 相比，可以获得更理想的产品和更少的固体残留物。生物质和塑料原料的催化转化使用分析和实验室规模的反应器系统进行，以评估所需的混合物和产品分布。发现分级ZSM-5中的表面和晶内介孔有利于大分子的转化，例如芳香族氧化物和长链烃。虽然塑料衍生的烯烃与热解蒸汽中的生物质衍生物协同相互作用，但分级结构扩展了反应物从催化剂表面进入微孔通道和内部酸性位点的可及性。

更新日期：2021-09-20

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