Methanol plays a crucial role in the novel cycle of carbon capture, recycling and valorisation of anthropogenic carbon dioxide (CO₂). Even though hydrogenation of CO₂ to methanol has favourable thermodynamics, catalyst and processes development is needed for improving stability, reaction rate and selectivity to higher values than of the currently used copper oxide on zinc oxide (CuO/ZnO) catalysts. Here we report an efficient supercritical flow process for the selective valorisation of CO₂ into methanol. At optimized conditions, rhenium oxide on titanium dioxide (ReO_x/TiO₂) catalyst converts CO₂ into methanol with 98% selectivity and at 18% CO₂ conversion rate at 200 °C, 100 bar and CO₂/H₂ ratio of 1/4. A higher conversion of 41% can be achieved at 250 °C, but the selectivity towards methanol decreases to 64%. This strategy has enabled the development of an efficient high-pressure flow process without compromising methanol selectivity.

甲醇在人为二氧化碳（CO ₂）的碳捕获，再循环和增值的新循环中起着至关重要的作用。尽管将CO ₂加氢成甲醇具有良好的热力学，但仍需要开发催化剂和方法来提高稳定性，反应速率和选择性，使其比目前使用的氧化锌/氧化铜（CuO / ZnO）催化剂具有更高的值。在这里，我们报告了一种有效的超临界流动过程，用于将CO ₂选择性增值成甲醇。在最佳条件下，二氧化钛（ReO _x / TiO ₂）上的氧化rh将CO ₂以98％的选择性和18％的CO ₂转化为甲醇200°C，100 bar和CO ₂ / H ₂比率为1/4时的转化率。在250°C时可实现41％的较高转化率，但对甲醇的选择性降低至64％。这种策略使开发高效的高压流工艺而又不影响甲醇的选择性。