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Microwave-assisted Pretreatment of Woody Biomass With Ammonium Molybdate Activated by H2O2

Microwave-assisted Pretreatment of Woody Biomass With Ammonium Molybdate Activated by H2O2

Pradeep Verma, Takahito Watanabe, Yoichi Honda, Takashi Watanabe

Bioresour Technol. 2011 Feb;102(4):3941-5.

PMID: 21177099

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13106768	Ammonium molybdate		13106-76-8	Price

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