Journal of the Japan Institute of Energy
Online ISSN : 1882-6121
Print ISSN : 0916-8753
ISSN-L : 0916-8753
Original Paper
Catalytic Properties of Palladium Nanoparticles for Hydrogenation of Carbon Dioxide into Formic Acid
Tetsuo UMEGAKIYuki SATOMIYoshiyuki KOJIMA
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2017 Volume 96 Issue 11 Pages 487-492

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Abstract

The present study investigated catalytic properties of palladium nanoparticles for hydrogenation of carbon dioxide into formic acid and effect of silica-coating on the palladium nanoparticles to maintain stability of the nanoparticles. The nanoparticles were obtained from palladium nitrate dissolved in methyl alcohol solvent under solvothermal conditions, and the activity for the hydrogenation reaction was evaluated under various reaction conditions. Reaction pressure influenced turnover number (TON) of the nanoparticles for hydrogenation of carbon dioxide into formic acid, and the TON significantly decreased with increasing reaction time under high reaction pressure. UV-Vis spectra of the solution after the hydrogenation reaction indicated that larger amount of active palladium species dissolved in the reaction solution under higher reaction pressure. In order to prevent the active palladium species from dissolving into the reaction solution, we investigated effect of silica coating on the palladium nanoparticles. Thicknesses of silica coated on the nanoparticles by sol-gel based method were controlled by adjusting amount of tetraethoxysilane (TEOS) using as the silica source, and addition of appropriate amount of silica was effective to prevent the active palladium species from dissolving into the reaction solution during the hydrogenation reaction. In addition, the silica coated catalyst possessed good recycle ability for the hydrogenation reaction.

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© 2017 The Japan Institute of Energy
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