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Dive into the research topics where Naruo Yokoyama is active.

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Featured researches published by Naruo Yokoyama.


Nippon Kagaku Kaishi | 1993

Shift of Methane Hydrate Formation Equilibrium with Additives.

Seiichi Yokoi; Toshiharu Okui; Tatsuji Kawasaki; Tetsuo Takahashi; Mikio Tateiwa; Naruo Yokoyama

メタンなどの天然ガスの水和物は,低温・高圧力下でのみ安定に存在する。著者らはこの系に添加剤を加えることにより,メタン水和物の生成平衡が,より高温・低圧力側に移動することを見いだした。この種の添加剤としては,1,3-ジオキソラン・シクロブタノン・テトラヒドロフラン・シクロペンタノン・アセトンなどが挙げられる。この効果は添加剤分子の大きさ・形状に強く影響され,官能基による影響は少ない。また,この平衡移動は添加剤濃度にも依存しており,水和物皿型格子中へのメタン分子の取り込みなどの結晶構造にかかわる機構の存在が示唆された。


Nippon Kagaku Kaishi | 1986

Observation of the fine structure of manganese compounds by electron microscope.

Shigekazu Udagawa; Kazuyori Urabe; Masumi Atsukawa; Naruo Yokoyama; Kazutaka Mori; Shigeru Nojima

Three manganese compounds, Mn3O4, β-MnO(OH) and δ-MnO2 were prepared by oxidizing amnioniacal alkaline solution of manganese(ll) sulfate with gaseous oxygen at 10°C.Their formation were identified by X-ray powder diffraction method.The fine structure of these manganese compounds were obser ved by transmission electron microscops. Three kinds of lattice planes, [211], [220], and [112] were found in Mn3O4. Whereas only [001] planes were observable in β-MnO(OH) and δ-MnO2. Especially in δ-MnO2, dislocation was recognized.


Archive | 1989

Solid strong acid catalyst process for the production of the same and use thereof

Shigeo Baba; Yukio Shibata; Takahiro Kawamura; Hideo Takaoka; Tsuguo Kimura; Kazuo Kousaka; Yoshihiro Minato; Naruo Yokoyama; Kozo Iida; Tetsuya Imai


Archive | 1987

Process for reforming methanol

Naruo Yokoyama; Tetsuya Imai; Hiroshi Fujita; Mitsuharu Murakami; Yoshio Miyairi; Mamoru Tamai


Archive | 1980

Catalyst for selectively reducing nitrogen oxides from oxygen-containing exhaust gases

Masumi Atsukawa; Yoshihiko Nishimoto; Naruo Yokoyama; Toshikuni Sera


Archive | 1985

Method for recovering denitrating catalyst for ammonia catalytic reduction

Kozo Iida; Tsuneo C O Ryomei Giken Nagano; Naruo Yokoyama; Yoshiaki Obayashi; Shigeaki Mitsuoka


Archive | 1991

PROCESS FOR ISOMERIZING HYDROCARBONS

Shigeo Baba; Yukio Shibata; Takahiro Kawamura; Hideo Takaoka; Tsuguo Kimura; Kazuo Kousaka; Yoshihiro Minato; Naruo Yokoyama; Kozo Iida; Tetsuya Imai


Archive | 1985

Solid strong auerer catalyst.

Shigeo Baba; Yukio Shibata; Takahiro Kawamura; Hideo Takaoka; Tsuguo Kimura; Kazuo Kousaka; Yoshihiro Minato; Naruo Yokoyama; Kozo Iida; Tetsuya Imai


Archive | 1985

Verfahren zum regenerieren eines denitrierkatalysators fuer die katalytische reduktion mit ammoniak. A method for regenerating a denitrating catalyst for catalytic reduction with ammonia.

Naruo Yokoyama; Shigeaki C O Hiroshim Mitsuoka; Tsuneo C O Ryomei Giken Nagano; Kozo Iida; Yoshiaki C O Hiroshim Obayashi


Archive | 1985

Verfahren zum reformieren von methanol A method for reforming methanol

Naruo Yokoyama; Tetsuya Imai; Hiroshi Fujita; Mitsuharu Murakami; Yoshio Miyairi; Mamoru Tamai

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Tetsuya Imai

Mitsubishi Heavy Industries

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