Optimization of permanently polarized hydroxyapatite catalyst. Implications for the electrophotosynthesis of amino acids by nitrogen and carbon fixation

The enhanced catalytic activity of permanently polarized hydroxyapatite, which is achieved using a thermally stimulated polarization process, largely depends on both the experimental conditions used to prepare crystalline hydroxyapatite from its calcium and phosphate precursors process parameters. A mineral similar brushite, an apatitic phase that can evolve found at surface highly hydroxyapatite. It appears after chemical precipitation hydrothermal treatment performed 150 °C for 24 h followed by sinterization 1000 applying voltage 500 V high temperature. Both crystallinity presence brushite-like electrophotocatalyst affect nitrogen carbon fixation under mild reaction (95 6 bar) synthesis glycine alanine simple gas mixture containing N2, CO2, CH4 H2O. Thus, Gly/Ala ratio be customized controlling brushite catalyst, enabling develop new strategies regulate production amino acids fixation.