Details of a Researcher - Okamoto, Masaki

Okamoto, Masaki

写真a

Affiliation: Faculty of Letters （Hiyoshi）

Position: Professor

Page Top ▲

Other Affiliation 【 Display / hide 】

Research and Education Center for Natural Sciences, Director

Page Top ▲

Career 【 Display / hide 】

1994

-

2002

Tokyo Institute of Technology , Research Associate
1997

-

1999

California Institute of Technology, Postdoc
2002.04

-

2019.03

Tokyo Institute of Technology, Associate Professor
2019.04

-

Present

Keio University, Faculty of Letters, Professor

Page Top ▲

Academic Background 【 Display / hide 】

1985.04

-

1989.03

Tokyo Institute of Technology

University, Graduated
1989.04

-

1991.03

Tokyo Institute of Technology

Graduate School, Completed, Master's course
1991.04

-

1994.03

Tokyo Institute of Technology

Graduate School, Completed, Doctoral course

Page Top ▲

Academic Degrees 【 Display / hide 】

博士（工学）, Tokyo Institute of Technology, Coursework, 1994.03

Synthesis of Trimethoxysilane by the Reaction of Silicon with Methanol Using Copper(I) Chloride as the Catalyst

Page Top ▲

Licenses and Qualifications 【 Display / hide 】

危険物取扱者（甲種）, 2000.07
衛生工学衛生管理者, 2009.10

Page Top ▲

Research Areas 【 Display / hide 】

Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Page Top ▲

Research Keywords 【 Display / hide 】

Reaction kinetics and catalyst
Manufacturing of various organic compounds

Page Top ▲

Books 【 Display / hide 】

固体表面キャラクタリゼーション機能性材料・ナノマテリアルのためのスペクトロスコピー

講談社サイエンティフィク, 2022

Scope: 第11章
Core-Shell and York-Shell Nanocatalysts

Springer, 2021

Scope: Chapter 12
ＰＣＰ／ＭＯＦおよび各種多孔質材料の作り方，使い方，評価解析

技術情報協会, 2019

Scope: 第４章第３節
ナノ空間材料ハンドブック

エヌ・ティー・エス, 2016

Scope: 第１章７節
触媒調製ハンドブック

エヌ・ティー・エス, 2011

Scope: 2章17節，3章3節

display all >>

Page Top ▲

Papers 【 Display / hide 】

Fabrication and Reinforcement of Macro- and Mesoporous Bimodal Materials from Mesoporous Silica-Alumina Spheres and Their Applications to Acid Catalysts and Adsorbents

Masaki Okamoto, Yuki Takahashi, Yusuke Takanaka

Catalysis Surveys from Asia （Springer Nature) 27 39 - 47 2023

Research paper (scientific journal), Joint Work, Lead author, Corresponding author, Accepted
- Access to Document (DOI)
Interlayer-expanded MWW-type zeolite catalysts with carbon filler in expanded micropores for efficient microwave heating

Masaki Okamoto, Takahiro Sakatsume, Shuntaro Tsubaki, Yuji Wada

Journal of Materials Chemistry A 10 14585 - 14593 2022

ISSN 20507488

　View Summary

Recently, microwave (MW) heating has been applied to chemical reactions instead of conventional heating because heating only catalysts by MW radiation is more energy-efficient than heating reaction systems by conventional heating. However, zeolites, which are widely used as catalysts in the chemical industry, can hardly be heated by MW radiation. Here, zeolite catalysts suitable for MW heating were prepared by filling carbon in the interlayer-expanded micropores of MWW-type zeolites. The carbon in the pores was readily heated by MW radiation. When the catalyst was heated in a nitrogen stream by MW radiation at 50 W of consumed electric power, the temperature reached 450 °C for 300 s. However, the temperatures of the MWW-type zeolite and the physical mixture of the MWW-type zeolite and graphite powder were 140 °C and 260 °C, respectively. This indicated that the carbon-filled interlayer-expanded MWW was suitable for MW heating. The methylation of toluene with methanol catalyzed using a proton-type C@expanded MWW by MW heating proceeded at a lower reaction temperature, compared with that of the methylation catalyzed using the physical mixture of the MWW-type zeolite and graphite. This indicated that the carbon-incorporated catalysts were suitable for MW heating and that the internal temperature of the catalyst particles was higher than the external temperature. This enhanced the shape selectivity because the reaction preferentially proceeded inside the pores.
- Access to Document (DOI)
1,3-butadiene production by crotyl alcohol dehydration over solid acids and catalyst deactivation by water adsorption

Atsushi Segawa, Tatsuya Ichijo, Nobuhiro Kimura, Keisuke Tsuruta, Naohiro Yoshida, Masaki Okamoto

Journal of the Japan Petroleum Institute （Journal of the Japan Petroleum Institute) 63 （ 2 ） 70 - 78 2020

ISSN 13468804

　View Summary

The synthesis of 1,3-butadiene via the dehydration of crotyl alcohol (2-buten-1-ol) over solid acids (six silica-alumina catalysts, two zeolite catalysts, and one γ-alumina catalyst) was assessed. Crotyl alcohol conversion and butadiene selectivity were both 95% or more over commercial silica-alumina catalysts. However, a sudden decrease in catalytic activity was observed during the reaction. Since the deactivated catalyst was regenerated by drying at 150°C -200°C, results showed that the main cause of the catalyst deactivation was the adsorption of water formed during the reaction and not the coke formation. An analysis of the deactivated catalyst indicated that, since the formation of Al-OH by the hydrolysis of the Al-O-Al bond increased the hydrophilicity of the catalyst surface, the adsorption of water on the catalyst surface was promoted, while that of crotyl alcohol was probably inhibited. Also, based on the catalyst characterization, the silica-alumina catalysts with few silanol groups, few alumina-rich zones, and a low Si/Al ratio were preferable.
- Access to Document (DOI)
Synthesis of Short, Needle-Shaped Crystals of TON-Type Zeolite by Addition of Inhibitors of Crystal Growth along the [001] Direction

Masaki Okamoto, Yohei Nishimura, Miyuki Takahashi, Wei Hung Chen

Crystal Growth and Design （Crystal Growth and Design) 18 （ 11 ） 6573 - 6580 2018.11

ISSN 15287483

　View Summary

TON-type zeolite crystals in the shape of short needles were synthesized using inhibitors of crystal growth along the [001] direction. When fluoride was used as a mineralizer, bulky amines incorporating structure-directing agents acted as inhibitors, while nonionic surfactants were more effective as inhibitors for decreasing the crystal length of TON-type zeolite. The amount of surfactant adsorbed on the zeolite increased with the surface area of the face containing pore mouths. This indicates that the surfactant was trapped in the pore mouths to inhibit crystal growth along the long axis of the needle-shaped crystals. By microscopic observation of the crystals, we confirmed inhibition of crystal growth by adsorption of the surfactant. After adsorption of Nile red, a lipophilic stain that is intensely fluorescent in surfactants, on as-synthesized zeolite, only the edges of the needle-shaped crystals were luminous, also indicating adsorption of the surfactant in pore mouths. When hydroxide was used as a mineralizer, the bulky amines acted as inhibitors. Nonionic surfactants, however, did not work. We used the obtained shorter crystals of TON-type zeolites as catalysts for hydroisomerization of n-tetradecane. Use of the shorter crystals improved the selectivity for skeletal isomerization.
- Access to Document (DOI)
Acetaldehyde Production from Ethanol by Eco-Friendly Non-Chromium Catalysts Consisting of Copper and Calcium Silicate

Atsushi Segawa, Akio Nakashima, Ryoichi Nojima, Naohiro Yoshida, Masaki Okamoto

Industrial and Engineering Chemistry Research （Industrial and Engineering Chemistry Research) 57 （ 35 ） 11852 - 11857 2018.09

ISSN 08885885

　View Summary

The authors developed eco-friendly non-chromium catalysts for acetaldehyde production through bioethanol dehydrogenation, consisting of copper and calcium silicate. Acetaldehyde selectivity was higher over copper calcium silicate catalysts with a CuO content of 40 wt % or more, because the number of acid sites on the calcium silicate was reduced, which helped prevent formation of byproducts. It was found that high ethanol conversion (39%-57%) and high acetaldehyde selectivity (91%-95%) could be achieved simultaneously at high temperature and high weight hourly space velocity conditions. Furthermore, it was shown that stable acetaldehyde production could be maintained over 20 h of time-on-stream. These catalysts were prepared from commercially available precursors and could be used in place of conventional copper chromite catalysts.
- Access to Document (DOI)

display all >>

Page Top ▲

Papers, etc., Registered in KOARA 【 Display / hide 】

Development of ordered porous catalysts with microwave-heating area adjoining reaction area

Okamoto, Masaki

学事振興資金研究成果実績報告書（慶應義塾大学) 2019

Page Top ▲

Reviews, Commentaries, etc. 【 Display / hide 】

Zeolite–Carbon Composite Catalysts for Microwave Heating

岡本　昌樹

ゼオライト 40 55 - 62 2023

Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author
シリカの分解反応を利用した規則性多孔体の形状および構造制御

岡本昌樹

ケイ素化学協会誌 36 15 - 23 2019

Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author
結晶成長によるコア－シェル構造を有するゼオライトの合成とその触媒作用

岡本昌樹

触媒 57 215 - 220 2015

Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author
中空および鈴型の構造を有するメソポーラスシリカの合成とその利用

岡本昌樹

ゼオライト 32 71 - 79 2015

Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author
規則性多孔体の合成における鋳型剤の抽出

岡本昌樹

触媒 46 320 2004

Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

display all >>

Page Top ▲

Research Projects of Competitive Funds, etc. 【 Display / hide 】

形状を制御した新規多孔体の創成

2003

No Setting
均一系触媒の固体触媒化

2000

No Setting

Page Top ▲

Intellectual Property Rights, etc. 【 Display / hide 】

水素化精製触媒の製造方法

Date applied：特願2016-072213

Date announced：特開2017-177062

Patent
水素化精製触媒の製造方法

Date applied：特願2016-072217

Date announced：特開2017-177063

Patent
有機珪素化合物の製造方法

Date applied：特願平5-52445

Date announced：特開平6-263769

Patent
中空ゼオライトの合成方法及び中空ゼオライト、並びにその中空ゼオライトからなる薬物担体

Date applied：特願2008-121459

Date announced：特開2009-269788

Patent
ベータゼオライトの修飾

Date applied：特願2007-058273

Date announced：特開2008-222448

Patent