Influence of metal (Fe/Zn) modified ZSM‐5 catalysts on product characteristics based on the bench‐scale pyrolysis and Py‐GC/MS of biomass. (2nd March 2020)

• Record Type: Journal Article
• Authors: Fang, Shuqi; Shi, Chong; Jiang, Luyao; Li, Pan; Bai, Jing; Chang, Chun
• Is Part Of: International journal of energy research. Volume 44:Number 7(2020)
• Page Start: 5455
• Page End: 5467
• Publication Date: 2020-03-02
• Subjects: catalytic pyrolysis -- modified ZSM‐5 -- product characteristics: Py‐GC/MS; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.5294
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: In this study, sawdust was selected as the raw material for biomass pyrolysis to obtain organic products. The catalyst was modified with two elements (Fe and Zn). Through analysis of the catalytic products, we attempted to identify a pyrolysis catalyst that can improve the yield of aromatic hydrocarbon products. ZSM‐5, modified with Fe and Zn, was investigated by X‐ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and Brunauer–Emmett–Teller (BET) measurements. Tube furnace and flash pyrolysis‐gas chromatography‐mass spectrometry (Py‐GC/MS) were used to comprehensively investigate the characteristics of the products of biomass pyrolysis. The highest yield of phenols was obtained using the Fe‐modified ZSM‐5 catalyst, which was 18.30% higher than the yield obtained by the pure ZSM‐5 catalyst. The lowest yield of acid products was obtained by single‐metal‐supported catalytic pyrolysis with Fe or Zn, which was 50.66% lower than the yield obtained by direct pyrolysis. During the pyrolysis of biomass using metal‐modified catalysts, the production of aromatic hydrocarbons was greatly improved. Among them, compared with direct pyrolysis, the Fe‐Zn co‐modified ZSM‐5 catalyst exhibited the weakest promotion of aromatic hydrocarbon formation, but there was still a 68.50% improvement. Although the co‐modified catalyst did not show absolute advantages under the conditions used for this experiment, the improvements in the production of aromatics and phenolic products also showed its potential for improving bio‐oil products. Under the action of Fe‐modified catalysts, the most abundant components in the gas product were CO and CO2, which reached levels as high as 53.45% and 15.34%, respectively, showing strong deoxidation capabilities. Therefore, Fe‐modified ZSM‐5 catalysts were found to better promote the formation of aromatic hydrocarbon products of biomass pyrolysis.