The influence of ferrous sulfate utilization on the sugar yields from dilute-acid pretreatment of softwood for bioethanol production.

Research output: Contribution to journalArticle


By employing metal salts in dilute-acid pretreatment the severity can be reduced due to reduced activation energy. This study reports on a dilute-acid steam pretreatment of spruce chips by addition of a small amount of ferrous sulfate to the acid catalyst, i.e., either SO(2), H(2)SO(3) or H(2)SO(4). The utilization of ferrous sulfate resulted in a slightly increased overall glucose yield (from 74% to 78% of the theoretical value) in pretreatment with SO(2) and H(2)SO(3). Impregnation with ferrous sulfate and sulfuric acid did not give any improvement compared with pretreatment based solely on H(2)SO(4).


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Engineering
Original languageEnglish
Pages (from-to)1103-1108
JournalBioresource Technology
Publication statusPublished - 2011
Publication categoryResearch