title: Designation of highly efficient catalysts for one pot conversion of glycerol to lactic acid.
abstract: Production of lactic acid from glycerol is a cascade catalytic procedure using multifunctional catalysts combined with oxidative and acidic catalytic sites. Therefore, a series of silver-exchanged phosphomolybdic acid catalysts (AgxH3-xPMo12O40, x = 1 ~ 3, abbreviated as AgxPMo) was designed and applied in glycerol oxidation with O2 as an oxidant to produce lactic acid (LA) without adding any base. Among all, total silver exchanged phosphomolybdic acid (Ag3PMo) was found to be the most active one with LA selectivity of 93% at 99% conversion under mild conditions of 5 h at 60 °C. The exceptionally high efficiency was contributed to the generation of strong Lewis acid sites, enhanced redox potentials and water-tolerance. More importantly, Ag3PMo was tolerant in crude glycerol from biodiesel production. And the reaction mechanism was also discussed. Meanwhile, Ag3PMo acted as a heterogeneous catalyst for 12 recycles without loss of activity.
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, P. R. China.
authors.forename: Meilin
authors.initials: M
authors.lastname: Tao
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, P. R. China.
authors.lastname: Dan Zhang
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, P. R. China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Guan
authors.affiliation: School of Biology, Northeast Normal University, Changchun 130024, People's Republic of China.
authors.forename: Guohui
authors.initials: G
authors.lastname: Huang
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, P. R. China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Wang