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Catalytic copyrolysis of metal impregnated biomass and plastic with Ni‐based HZSM‐5 catalyst: Synergistic effects, kinetics and product distribution
Author(s) -
Zheng Yunwu,
Wang Jida,
Liu Can,
Lu Yi,
Lin Xu,
Li Wenbin,
Zheng Zhifeng
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5370
Subject(s) - char , catalysis , product distribution , chemistry , cellulose , low density polyethylene , lignin , pyrolysis , chemical engineering , biomass (ecology) , activation energy , coke , organic chemistry , polyethylene , oceanography , engineering , geology
Summary The present work aims to investigate the thermal behavior, kinetics, thermodynamics, and product distribution during copyrolysis of transition metal salt (Ni, Co, Zn, Cu, and Fe)‐added biomass and model compounds with low density polyethylene(LDPE) over a Ni‐based HZSM‐5 catalyst by TGA and fixed bed reactor. The interactions and reaction mechanisms during copyrolysis were evaluated. The influence of Ni‐impregnated biomass (C‐M) and Ni‐modified HZSM‐5 (Ni/HZ) on the formation of pyrolysis bio‐oil from biomass and model compounds and its subsequent effect on catalytic pyrolysis vapor upgrading was discussed. The results indicated that the presence of transition metal decreased the thermal degradation temperature and thermodynamics parameters; maximum decomposition rate, and reaction complexity. Ni/HZ catalyst could further decrease the activation energy, accelerate the reaction rate and change reaction process, and the modified samples/LDPE under copyrolysis with HZSM‐5 catalyst presented a more significant effect than Ni/HZ catalyst. Subsequently, the Ea of pine, cellulose and lignin changed from 24.11, 18.29, and 28.68 kJ/mol (CP@Ni/HZ) to 56.04, 69.84, and 16.21 kJ/mol (CP‐Ni@HZSM‐5), respectively. In addition, Ni could inhibit the depolymerization of cellulose and promoted the formation of char, coke, and lignin derived phenolics. And Ni‐impregnated biomass reduced the formation of desired aromatic hydrocarbons, but result in increasing of the char and non‐condensable gases. But Ni/HZ catalysts promote the conversion of biomass to target products.