Enabling deep understanding of Power-to-Ammonia catalysts for renewable fuel production with the help of transient operando photon-in/photon

This LTP is motivated by systematic studies on ammonia synthesis catalysts under the realistic conditions of the Haber-Bosch process, as employed for the production of sustainable renewable ammonia at offshore wind power plants. Over the course of 6 beamtime scheduling periods, electronic and geometric structure of active metals (Fe, Ru) as well as of electronic (K, Cs, Ca, Ba) and structural (Al, Si) promoters will be thoroughly studied at the ID26 beamline under stationary and transient conditions. In the course of the LTP a pixel detector will be installed in the TEXS which, together with sets of high quality Johansson crystals, which will enable X-ray Fluorescence Intensity Ratio Detection (XFIRD). Furthermore, a high pressure operando catalysis cell will be developed. The planned investments will enable spatially- and time-resolved operando tender X-ray HERFD-XANES and XES spectroscopy on working catalysts for chemical energy storage and related processes.

本长期实验计划（Long-Term Proposal，LTP）旨在针对哈伯-博施工艺（Haber-Bosch process）真实工况下的氨合成催化剂开展系统性研究，该工艺可应用于海上风力发电厂生产可持续可再生氨。在6个束流时间调度周期内，研究团队将在ID26光束线（ID26 beamline）的稳态与瞬态工况下，对活性金属（铁Fe、钌Ru）以及电子助剂（钾K、铯Cs、钙Ca、钡Ba）与结构助剂（铝Al、硅Si）的电子结构与几何结构开展全面深入的表征研究。在本长期实验计划实施期间，将在TEXS终端安装像素探测器，搭配多套高品质约翰松晶体（Johansson crystal），以此实现X射线荧光强度比检测（X-ray Fluorescence Intensity Ratio Detection, XFIRD）技术。此外，本项目还将研发一款高压原位催化池（high pressure operando catalysis cell）。本次规划的设备升级与配套投入将支持针对化学储能及相关工艺中工作催化剂的时空分辨原位过渡能区X射线（tender X-ray）高能量分辨荧光检测X射线吸收近边结构谱（High Energy Resolution Fluorescence Detected X-ray Absorption Near Edge Structure, HERFD-XANES）与X射线发射谱（X-ray Emission Spectroscopy, XES）表征。