Catalytic Conversions of Furfural to Pentanediols

Catalytic conversion processes of furfural to 1,5- and 1,2-pentanediols are reviewed. There are two reaction paths. One is the combination of total hydrogenation of furfural to tetrahydrofurfuryl alcohol (THFA) and selective hydrogenolysis of THFA to 1,5-pentanediol. The former reaction is catalyzed by noble metal catalysts such as Pd-based ones at low temperature (a parts per thousand currency sign313 K), and the latter reaction is catalyzed by M-M'O-x catalysts (M = Rh or Ir; M' = V, Mo, W or Re) at higher temperature (a parts per thousand yen373 K). Another path has the ring-opening of furfuryl alcohol as a key step, and noble metal catalysts with basic supports such as hydrotalcite are effective. 1,2-Pentanediol can be produced via this path.