異なる混合パターンを持つ二金属Cu-Pd触媒を用いた二酸化炭素を炭化水素に還元する
Sichao Ma1,2, Masaaki Sadakiyo2,3, Minako Heima2,3
1Dept. of Chemistry and Chemical and Biomolecular Engineering, UIUC , 600 S. Mathews Ave., Urbana, Illinois 61801, United States.
Journal of the American Chemical Society
|December 14, 2016
まとめ
研究者は,電気化学的二酸化炭素 (CO2) 変換のための二金属銅パラジウム (Cu-Pd) 触媒を調査した. オーダーされたCu-Pd触媒はC1化学物質を選択的に生成し,相分離触媒はC2化学物質を好み,調整可能なCO2利用を提供した.
科学分野:
- 電気化学と触媒
- 材料科学
- 環境化学
背景:
- 二酸化炭素 (CO2) の電気化学的変換は,CO2の利用と再生可能エネルギーの貯蔵に不可欠です.
- 銅 (Cu) は二酸化炭素を炭化水素に変換する主要な電気触媒であるが,選択性がなく,様々な製品を生成する.
- 特定のCO2削減製品のための高度に選択的な触媒の開発は不可欠です.
研究 の 目的:
- 二酸化炭素削減のための異なる原子配列を持つ二金属Cu-Pd触媒を調査する.
- CO2電気触媒におけるC1またはC2化学物質に対する選択性に影響を与える主要な要因を特定する.
- 触媒の性能における幾何学的および電子的効果の役割を理解する.
主な方法:
- オーダーされた,無秩序な,相分離した構造を持つ様々な二金属Cu-Pd触媒を合成し,研究した.
- CO2の電還元過程におけるC1 (例えばCO) およびC2 (例えばエチレン) 製品の分析された触媒選択性.
- 電子と幾何学的特性を探査するために表面バレンスの帯域スペクトロスコーピーを利用した.
主要な成果:
- オーダーされたCuPd (1:1原子比) はC1製品に対して最も高い選択性を示した.
- CuPdとCu3Pdを相隔離した触媒は,他の装置と比較してC2製品に対する選択性が向上した (> 60%).
- 選択性を決定する主な要因は電子的効果ではなく,幾何学的な配置であった.
結論:
- 二金属Cu-Pd触媒の幾何学的な配置を調整することで,CO2からC1またはC2の化学物質を選択的に生成することができます.
- 触媒表面の隣接するCu原子は,C1中間物質のC2製品への二酸化を促進する.
- これらの発見は,効率的なCO2の電気還元のための高度な触媒面の設計のための洞察を提供します.
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