2019 Fiscal Year Final Research Report
Flame spray pyrolysis of stable composite nanoparticles with high surface area for metal supported catalysts
| Project/Area Number |
19K21068
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| Project/Area Number (Other) |
18H05888 (2018)
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund (2019)
Single-year Grants (2018) |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2018-08-24 – 2020-03-31
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| Keywords | 燃焼合成 / ナノ粒子 / 構造制御 / 担持金属触媒 / 熱流体工学 |
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| Outline of Final Research Achievements |
For automotive exhaust after-treatment catalyst, precious metal agglomeration and following deterioration of catalytic conversion efficiency is one of the big problems. In order to stabilize metal phase and prevent agglomeration, here we aim to fabricate composite nanoparticles consisting of precious metal and oxide phases by combustion synthesis method. For particle fabrication, combustion synthesis apparatus with coaxial flow diffusion flame burner with double tube structure was constructed. In CH4/O2 diffusion flame, chemical precursor solution atomized by ultrasonic vibrator is supplied with N2. By using the constructed equipment, Pt/CeO2 nanoparticles were synthesized. From a mixture solution of Ce and Pt precursors, 5wt%-Pt/CeO2 nanoparticles with CeO2 diameter of around 100 nm and Pt of around 10 nm were synthesized. In addition, 3D-structure observation of Pt/CeO2 particles by TEM tomography shows that Pt particles are embedded on CeO2 surface or included inside CeO2 particles.
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| Free Research Field |
熱工学
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| Academic Significance and Societal Importance of the Research Achievements |
工業的に広く用いられる担持金属触媒においては，貴金属の凝集を防ぐことは大きな課題である．現在は凝集による性能劣化分を見越して過剰な貴金属を使用することで対応しており，資源有効利用とコストの両面から問題となっている．本研究課題では燃焼合成によって従来よりも耐凝集性の高い構造を有する触媒粒子を作製することを目指している．また燃焼合成で得られる特異な構造を触媒の安定性向上に利用するという今回のアプローチは，燃焼による材料合成の分野において新しい視点であり，学術的意義を有する．
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