Hydroxyapatite-based biphasic catalysts with plasticity properties and its potential in carbon dioxide fixation

被引:18
|
作者
Sans, Jordi [1 ,2 ]
Arnau, Marc [1 ,2 ]
Sanz, Vanesa [3 ]
Turon, Pau [3 ]
Aleman, Carlos [1 ,2 ,4 ]
机构
[1] Univ Politecn Cataluna, Dept Engn Quim, EEBE, C Eduard Maristany 10-14,Ed I2, Barcelona 08019, Spain
[2] Univ Politecn Cataluna, Barcelona Res Ctr Multiscale Sci & Engn, C Eduard Maristany 10-14, Barcelona 08019, Spain
[3] B Braun Surg, SAU Carretera Terrasa 121, Rubi 08191, Barcelona, Spain
[4] Barcelona Inst Sci & Technol, Inst Bioengn Catalonia IBEC, Baldiri Reixac 10-12, Barcelona 08028, Spain
关键词
Calcium phosphate; CO2; reduction; Ethanol production; Heterogeneous catalysis; Polarized hydroxyapatite; ELECTROCHEMICAL REDUCTION; ELECTROCATALYTIC REDUCTION; HYDROGEN EVOLUTION; CO2; REDUCTION; BRUSHITE; CONVERSION; ELECTRODE; MONETITE; INSIGHTS; FORMATE;
D O I
10.1016/j.cej.2021.133512
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The design of catalysts with controlled selectivity at will, also known as catalytic plasticity, is a very attractive approach for the recycling of carbon dioxide (CO2). In this work, we study how catalytically active hydroxyapatite (HAp) and brushite (Bru) interact synergistically, allowing the production of formic acid or acetic acid depending on the HAp/Bru ratio in the catalyst. Raman, wide angle X-ray scattering, X-ray photoelectron spectroscopy, scanning electron microscopy and electrochemical impedance spectroscopy studies, combined with an exhaustive revision of the crystalline structure of the catalyst at the atomic level, allowed to discern how the Bru phase can be generated and stabilized at high temperatures. Results clearly indicate that the presence of OH- groups to maintain the crystalline structural integrity in conjunction with Ca2+ ions less bonded to the lattice fixate carbon into C1, C2 and C3 molecules from CO2 and allow the evolution from formic to acetic acid and acetone. In this way, the plasticity of the HAp-Bru system is demonstrated, representing a promising green alternative to the conventional metal-based electrocatalysts used for CO2 fixation. Thus, the fact that no electric voltage is necessary for the CO2 reduction has a very favorable impact in the final energetic net balance of the carbon fixation reaction.
引用
收藏
页数:10
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