Performance and Stability of Corundum‐type In2O3 Catalyst for Carbon Dioxide Hydrogenation to Methanol
甲醇
催化作用
二氧化碳
刚玉
化学工程
材料科学
化学
无机化学
有机化学
复合材料
工程类
作者
Albert Gili,Georg Brösigke,Mudassar Javed,Emiliano Dal Molin,Philipp Isbrücker,Jens‐Uwe Repke,Franziska Heß,Aleksander Gurlo,Reinhard Schomäcker,Maged F. Bekheet
Carbon dioxide hydrogenation to methanol is a key chemical reaction to store energy in chemical bonds, using carbon dioxide as an energy sink. Indium oxide is amongst the most promising candidates for replacing the copper and zinc oxide catalyst, which is industrially applied for syngas mixtures but less idoneous for educts with carbon dioxide due to instability reasons. The polymorph of indium oxide and the operating conditions remain to be optimized for optimal and stable performance. Indium oxide catalysts containing different rhombohedral and cubic phase ratios were synthesized using a solvothermal method and evaluated in an ideally mixed gas phase reactor. The pure rhombohedral catalyst achieved the best performance in terms of yield to methanol, selectivity, and stability. The phase stability was assessed using synchrotron in-situ XRD and Rietveld refinement, shedding light on the stability of the different phases at extended operating conditions. Depending on the flow rate, temperature, and hydrogen partial pressure, a rhombohedral to cubic transition occurs, ultimately yielding inactive metallic indium. If present, cubic In2O3 serves as nuclei to induce the cubic to rhombohedral transition, hampering performance. These results allow for a more rational catalyst design and fine-tuning of the operating conditions, ensuring optimal and stable performance.