3 years ago

Polydopamine-Mediated Formation of MnSn(OH)6 on Cryptomelane-Type Manganese Oxide for Catalyzing Glucose Isomerization to Fructose

Polydopamine-Mediated Formation of MnSn(OH)6 on Cryptomelane-Type Manganese Oxide for Catalyzing Glucose Isomerization to Fructose
Peng Li, Xianlin Meng, Peijun Ji, Mengmeng Du
Efficient isomerization of glucose into fructose contributes to the utilization of biomass producing 5-hydroxymethylfurfural (HMF). In this work, we have explored a novel catalyst for isomerization of glucose into fructose. By the mediation of polydopmaine (PDA), MnSn(OH)6 was formed on cryptomelane-type manganese oxide (OMS-2). The composite MnSn(OH)6/PDA@OMS-2 can efficiently catalyze the glucose isomerization to fructose, with a yield of fructose 47 ± 1.6%. When used together with the Brønsted acid catalyst Amberlyst-15, the HMF yield from glucose was 53 ± 2.5%. Consecutive use of the composite demonstrated that after eight cycles the activity can be retained in terms of the yield of fructose. The mechanism of polydopamine-mediated formation of MnSn(OH)6 has been investigated. The desired yield of fructose has been obtained by MnSn(OH)6/PDA@OMS-2, and the preparation of the catalyst has also shown advantages, including low cost and easy preparation, short preparation time (36 h), and low temperature (70 °C).

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01353

DOI: 10.1021/acs.iecr.7b01353

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