| 研究実績の概要 |
In order to improve catalytic activity of CeO2 nanoparticle for hydrogenation from biomass conversion, Cr doping was investigated. 5 mol% Cr-doped cubic CeO2 nanoparticles was synthesized using batch reactor. The high-resolution transmission electron microscopy (HRTEM) showed that cubic Cr-doped CeO2 exposed with {100} facet. The kinetic study was carried out at 150 ℃, 200 ℃, 300 ℃, 350 ℃, 400 ℃ respectively.During the temperature increase process, from XRD patterns Cr compound will be formed even at 150 ℃ and 200 ℃.
The oxygen-storage capacity (OSC) is defined as the amount of oxygen stored in and released from the solid. The OSC of5 mol% Cr-doped CeO2 and cubic CeO2 was measured using thermogravimetric differential thermal analysis (BELCAT) which shows that Cr-doped CeO2 is 1.5 times as large as cubic CeO2 at 250 ℃ and 2.5 times as large as cubic CeO2 at 300 ℃.
Biomass-derived methanol have been used as the model compound for hydrogen generation at 300 ℃ for 1 hour in batch reactor. When 5 mol% Cr-doped CeO2 used as catalyst, H2 amount is 25.6 times as large as no catalyst, and is 3.0 times as large as CeO2 used as catalyst. This result suggests that Cr doping can effectively improve the catalytic activity of CeO2 and also increase hydrogen generation amount.
Because of the high speed temperature increase process and fast reaction rate,a lab-scale plug-flow reactor was used to increase Cr doping amount.Cr doping amount can reach 21 mol%.XRD patterns showed that the diffraction peak shifted toward a higher angle as the Cr was doped into the CeO2.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
Based on the research results, Cr doping can improve the oxygen storage capacity (OSC) of CeO2 nanoparticles. We can obtained the 21 mol% Cr-doped CeO2 nanoparticles using flow type reactor. From methonal decomposition experiment, we can know that Cr doping can effectively improve the catalytic activity of CeO2 and also increase hydrogen generation amount. These results are almost consistent with expectations.
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