Improvement of wheat (T. aestivum) straw catalytic fast pyrolysis for valuable chemicals production by coupling pretreatment of acid washing and torrefaction

Xiong Gao, Zhen Zhou, Brad Coward, Jiawei Wang, Hong Tian, Yanshan Yin, Yi Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The present work investigated the coupling pretreatment of acid washing and torrefaction to address secondary cracking of target products and condensation of intermediates and improved bio-oil quality and hydrocarbon selectivity of the catalytic fast pyrolysis (CFP) process. The total hydrocarbon yields in CFP increased from 28.06 wt% to 55.31 wt% by torrefaction and 46.29 wt% by coupling pretreatment. The acid washing resulted in fewer acids and phenols and more sugars in bio-oil by decreasing the AAEMs. The removal rate of the potassium was up to 96.7 %, and other elements were above 83 %. Torrefaction elevated the C/O ratio and the higher calorific value of biomass. It could also decrease the acid content in obtained bio-oil in the CFP process. In addition, the TG/TGA results showed that higher torrefaction temperature decreased the total weight loss of biomass. Meanwhile, the acid washing pretreatment improved the resolution of the two pyrolysis peaks of the DTG curve. These results showed that the AAEMs removal and intermediates inhibition could elevate the selectivity of the valuable chemical.

Original languageEnglish
Article number115475
Number of pages9
JournalIndustrial Crops and Products
Issue numberPart B
Early online date9 Aug 2022
Publication statusPublished - 1 Nov 2022

Bibliographical note

© 2022, The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (

Funding Information: This work was supported by the Natural Science Foundation of China for Young Scholars (No.51706022, No.52006016), the Key Foundation of Hunan Educational Committee of China (No. 20A004, No. 20B041), Natural Science Foundation of Changsha (No. kq2202202), and the Innovative Team of Key Technologies of Energy Conservation, Emission Reduction and Intelligent Control for Power-Generating Equipment and System at CSUST. The author Yi Cheng and Jiawei Wang would like to acknowledge the Marie Skłodowska Curie Actions Fellowships by The European Research Executive Agency (H2020-MSCA-IF-2020, no. 101025906).


  • Acid washing
  • Catalytic fast pyrolysis
  • Pretreatment
  • Torrefaction
  • Wheat straw


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