Dehydrogenation of anhydrous methanol at room temperature by o-aminophenol-based photocatalysts

Masanori Wakizaka, Takeshi Matsumoto, Ryota Tanaka and Ho-Chol Chang ()
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Masanori Wakizaka: Faculty of Science and Engineering, Chuo University
Takeshi Matsumoto: Faculty of Science and Engineering, Chuo University
Ryota Tanaka: Faculty of Science and Engineering, Chuo University
Ho-Chol Chang: Faculty of Science and Engineering, Chuo University

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Dehydrogenation of anhydrous methanol is of great importance, given its ubiquity as an intermediate for the production of a large number of industrial chemicals. Since dehydrogenation of methanol is an endothermic reaction, heterogeneous or homogeneous precious-metal-based catalysts and high temperatures are usually required for this reaction to proceed. Here we report the photochemical dehydrogenation of anhydrous methanol at room temperature catalysed by o-aminophenol (apH2), o-aminophenolate (apH−) and the non-precious metal complex trans-[FeII(apH)2(MeOH)2]. Under excitation at 289±10 nm and in the absence of additional photosensitizers, these photocatalysts generate hydrogen and formaldehyde from anhydrous methanol with external quantum yields of 2.9±0.15%, 3.7±0.19% and 4.8±0.24%, respectively, which are the highest values reported so far to the best of our knowledge. Mechanistic investigations reveal that the photo-induced formation of hydrogen radicals triggers the reaction.

Date: 2016
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DOI: 10.1038/ncomms12333

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