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Microwave-assisted pretreatment of woody biomass with ammonium molybdate activated by H2O2.

Bioresource technology (2010-12-24)
Pradeep Verma, Takahito Watanabe, Yoichi Honda, Takashi Watanabe
ABSTRACT

Pretreatments for enzymatic saccharification are crucial for the establishment of lignocellulosic biorefineries. In this study, we focused on ammonium ions and peroxometal complexes as potential delignifying agents. We first examined the pretreatment of beech wood with nine different ammonium salts in the presence of H(2)O(2). Significant pretreatment effects were found only for ammonium molybdate, which is transformed to a peroxometal complex on reacting with H(2)O(2). Since microwave sensitizer effects are expected for (peroxo)molybdate, beech wood was pretreated using external heating and microwave irradiation. As a result, a maximum sugar yield of 59.5% was obtained by microwave irradiation at 140°C for 30 min, while external heating in an autoclave gave a sugar yield of 41.8%. We also found that an ammonium ion is the key counterion accelerating the pretreatment with molybdate. These results highlight the powerful selective delignifying capability of the H(2)O(2)-activated ammonium molybdate system energized by microwave radiation.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ammonium molybdate, 99.98% trace metals basis
Sigma-Aldrich
Ammonium molybdate tetrahydrate, ACS reagent, 81.0-83.0% MoO3 basis
Sigma-Aldrich
Ammonium molybdate tetrahydrate, ACS reagent, 99.98% trace metals basis
Sigma-Aldrich
Ammonium molybdate tetrahydrate, BioUltra, ≥99.0% (T)
Sigma-Aldrich
Ammonium molybdate, meets USP testing specifications
Sigma-Aldrich
Ammonium molybdate tetrahydrate, BioReagent, suitable for cell culture, suitable for insect cell culture, 81.0-83.0% MoO3 basis