Premium
Production of bio‐based p ‐xylene via catalytic pyrolysis of biomass over metal oxide‐modified HZSM‐5 zeolites
Author(s) -
Chang Rui,
Zhu Lijuan,
Jin Feng,
Fan Minghui,
Liu Junxu,
Jia Qifang,
Tang Chi,
Li Quanxin
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5691
Subject(s) - xylene , chemistry , sawdust , isomerization , catalysis , toluene , methanol , pyrolysis , organic chemistry , ethylbenzene , p xylene , benzene , inorganic chemistry
BACKGROUND p ‐Xylene is an important bulk chemical in the petrochemical industry, and the production of bio‐based p ‐xylene is of great significance in both academic and industrial arenas. However, the biggest challenge for the production of p ‐xylene from biomass is how to increase the yield and selectivity of p ‐xylene. RESULTS The highest p ‐xylene yield of 20.7 C‐mol% with a p ‐xylene/xylenes ratio of 91.6% was obtained by the co‐catalytic pyrolysis of sawdust with 50 wt% methanol over the 20%La 2 O 3 /HZSM‐5(80) catalyst. Adding a La, Mg, Ce or Zn element into HZSM‐5 promoted the alkylation of benzene and toluene to form xylenes, and the isomerization of m/o ‐xylenes to p ‐xylene. CONCLUSION This work developed a one‐pot process in which lignocellulosic biomass (sawdust) was directionally converted into p ‐xylene by coupling the catalytic pyrolysis of biomass into aromatic monomers, the alkylation of light aromatics to xylenes and the isomerization of m/o ‐xylenes to p ‐xylene over the metal oxide‐modified HZSM‐5 catalysts. The selectivity and yield of p ‐xylene strongly depended on the acidity of the catalysts, reaction temperature and methanol additive during the catalytic pyrolysis of sawdust. © 2018 Society of Chemical Industry