Efficient and Product-Controlled Depolymerization of Lignin Oriented by Raney Ni Cooperated with CsxH3 − xPW12O40 (2017) (Journal)

Description

Description

Abstract A representative lignin was firstly prepared and
characterized as well as an efficient lignin depolymerization
process with highly controllable products was presented using
Cs-substituted tungstophosphate (CsTP) cooperated with
Raney Ni in the present study. The double enzymatic lignin
(DEL) was depolymerized efficiently in the temperature range
of 250–280 °C. The synergistic effects of Raney Ni with CsTP
and temperature on the degradation of lignin were investigated
by FT-IR, NMR, GPC, and GC-MS techniques. Under the
optimal condition with tandem catalyst at 270 °C for 3 h, the
yield of depolymerized DEL was over 70 wt% and phenolic
monomers were over 20%. The weight average molecular
weight of the lignin was reduced significantly from 15,770
to 1150 g/mol (for aqueous phase lignin) and about 420 g/
mol (organic phase lignin). In addition, only a few syringols
and cyclohexanols were obtained, indicating that this tandem
catalyst facilitates the depolymerization and demethoxylation
but prevents hydrogenation of benzene ring of lignin. More
importantly, the formation of char was restrained effectively in
this process.
22 Jul 2017

Journal

JournalEfficient and Product-Controlled Depolymerization of Lignin Oriented by Raney Ni Cooperated with CsxH3 − xPW12O40 (2017)

Keywords

  • Lignin isolation, Depolymerization, Cs-substituted tungstophosphate, Raney Ni