“…Representative acetogens include Acetobacterium woodii ( Weghoff et al, 2015 ), Clostridium aceticum ( Poehlein et al, 2015 ), Clostridium autoethanogenum ( Im et al, 2021 ), and Clostridium ljungdahlii ( Köpke et al, 2010 ). Although acetogen strains mainly produce C2 compounds (acetate and ethanol) from syngas, they are also known to produce C4–C6 acids and alcohols ( Charubin et al, 2018 ; Bao et al, 2019 ; Im et al, 2021 ). Among them, C. carboxidivorans P7 ( Phillips et al, 2015 ) and C. ragsdalei ( Ramachandriya et al, 2013 ) were reported to produce 0.94 and 0.09 g/L of hexanol, respectively, from syngas.…”