著者

春田 正毅

出版者

分子科学会

雑誌

Molecular Science (ISSN:18818404)

巻号頁・発行日

vol.6, no.1, pp.A0056, 2012 (Released:2012-06-21)

参考文献数

36

被引用文献数

1

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Although gold (Au) in bulk is almost inert as a catalyst, it turns to be active for many reactions when deposited as nanoparticles (NPs) and clusters on base metal oxides. They are characterized by three features; active at low temperatures, enhanced by water, and uniquely selective. Over supported Au NPs CO adsorbs on the Au surfaces and O2 is activated at the perimeter interfaces around Au NPs. Both the two adsorbates react with each other at the perimeter interfaces. Gold clusters are expected to exhibit unique selectivity through the precise control of the number of atoms and the selection of appropriate support materials.

著者

望月 ちひろ 宍戸 哲也 石田 玉青 春田 正毅 村山 徹

出版者

公益社団法人 石油学会

雑誌

石油学会 年会・秋季大会講演要旨集 第49回石油・石油化学討論会(山形大会)

巻号頁・発行日

pp.208, 2019 (Released:2019-12-31)

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バイオマスから得られる重要な基幹化合物である5-ヒドロキシメチルフルフラールを選択酸化することで得られる2,5-ジフォルミルフランは、医薬品, 機能性ポリマー合成の重要な前駆体である。本研究では、アルコール酸化反応の光触媒として知られるNb2O5に様々な金属ナノ粒子を担持しHMF選択酸化反応を検討した。この結果、Nb2O5のみに比べAuナノ粒子を担持することで活性・選択性の向上が確認されたので報告する。

著者

春田 正毅

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.51, no.11, pp.721-726, 2008 (Released:2009-01-15)

参考文献数

40

被引用文献数

3 5

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Gold has long been neglected as a catalyst because of its chemical inertness. However, when gold is deposited as nanoparticles on carbon and polymer materials as well as on base metal oxides and hydroxides, it exhibits unique catalytic properties for many reactions such as CO oxidation at a temperature as low as 200 K, gas phase direct epoxidation of propylene, and aerobic oxidation of glucose to gluconic acid. The structure-catalytic activity correlations are discussed with emphasis on the contact structure, support selection, and the size control of gold particles. Gold clusters with diameters smaller than 2 nm are expected to exhibit novel properties in catalysis, optics, and electronics depending on the size (number of atoms), shape, and the electronic and chemical interaction with the support materials. The above achievements and attempts can be regarded as a modern alchemy that creates valuables by means of the noblest element with little practical use.

著者

春田 正毅

出版者

公益社団法人 日本表面科学会

雑誌

表面科学 (ISSN:03885321)

巻号頁・発行日

vol.32, no.2, pp.70-75, 2011

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Among base metal oxides, Co₃O₄, MnO₂, and NiO, which have p-type semiconducting properties, hold potential catalytic capability for the oxidation of carbon monoxide (CO) at temperatures below 0^oC. Either of the following requirements should be fulfilled; low moisture content in reaction feed, optimum temperature and atmosphere for catalyst pretreatments, and the control of metal oxide morphology. Surface oxygen vacancies are assumed to play a key role in low temperature CO oxidation.

著者

春田 正毅

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.51, no.11, pp.719-720, 2008 (Released:2009-01-15)

参考文献数

2