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High Selectively Catalytic Conversion of Lignin-Based Phenols into para-/m-Xylene over Pt/HZSM-5 Guozhu Liu, Yunxia Zhao and Jinhua Guo Abstract: High selectively catalytic conversion of lignin-based phenols (m-cresol, p-cresol, and guaiacol) into para-/m-xylene was performed over Pt/HZSM-5 through hydrodeoxygenation and in situ methylation with methanol. It is found that the p-/m-xylene selectivity is uniformly higher than 21%, and even increase up to 33.5% for m-cresol (with phenols/methanol molar ratio of 1/8). The improved p-/m-xylene selectivity in presence of methanol is attributed to the combined reaction pathways: methylation of m-cresol into xylenols followed by HDO into p-/m-xylene, and HDO of m-cresol into toluene followed by methylation into p-/m-xylene. Comparison of the product distribution over a series of catalysts indicates that both metals and supporters have distinct effect on the p-/m-xylene selectivity. 1. Introduction p-/m-Xylene, an important intermediate for making polyethylene terephthalate (PET), is industrially derived from the reforming of petroleum naphtha. With depleting stocks of fossil fuels and growing concern on the excessive emission of greenhouse gases, great efforts have been made to develop alternative method of producing sustainable p-/m-xylene from biomass-based compounds [1–4]. Shiramize and Toste [1] proposed a method to produce p-xylene with 2,5-dimethyfuran (derived from lignocellulosic biomass) and acrolein (from glycerol, a side product of biodiesel production) through four step-reactions with an overall yield of 34%. Lyons et al. [2] used ethylene (derived from biomass or shale gas) as an alternative feedstock, and synthesized p-xylene through a very complex process involving trimerizaiton, dehydrogenation, Diels-Alder reaction, and further dehydrogenation. Williams et al. [3] suggested a renewable route to p-xylene from cycloaddition/dehydration of biomass-based dimethylfuran and ethylene with a high selectivity of 75% using Y zeolite as catalyst. Very recently, Cheng et al. [4] reported the production of p-xylene from 2-methylfuran (a product of catalytic fast pyrolysis of lignocellulosic biomass) and propylene using ZSM-5 catalysts. For all of those methods lignocellulosic biomass or its derivatives were used as feedstocks. ReprintedfromCatalysts.Citeas: Liu,G.;Zhao,Y.;Guo,J.HighSelectivelyCatalytic Conversion of Lignin-Based Phenols into para-/m-Xylene over Pt/HZSM-5. Catalysts 2016, 6, 19. 205PDF Image | Zeolite Catalysis
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