Elevated temperature pressure swing adsorption is a newly developed gas purification technology, wherein the product gas recovery rate can be significantly improved by adding a steam rinse and purge. Furthermore, high temperature industrial syngas can be directly purified at elevated temperatures, so the temperature variation during purification process is not as large as that in Selexol, Rectisol or some other methods, which benefits to the simplification of heat management and improvement of energy efficiency. At working temperatures of approximately 200 °C, activated carbon is considered to be a promising adsorbent. Nevertheless, activated carbon also adsorbs large amounts of steam during rinse and purge, which affects its adsorption capacity. Herein, hydrophobic activated carbon was synthesized by impregnation and characterized, achieving a contact angle with a water droplet of up to 134°. When exposed to wet air, the weight increase of the hydrophobic adsorbent was 0.3%, whereas it was approximately 12% for the commercial activated carbon, which can be mainly attributed to vapor adsorption. The CO₂ adsorption capacity was tested under humid conditions at 200 °C on a fixed bed. The effect of steam on the hydrophobic adsorbent was much smaller than that on the commercial adsorbent. The working capacity decreased from 0.091 to 0.009 mmol/g when the commercial activated carbon was operated under steam at 1 atm, whereas the hydrophobic material exhibited a stable and desired working capacity at the same condition, which was around 0.05 mmol/g. Steam rinse and purge were demonstrated to be feasible for the hydrophobic adsorbent and the introducing of steam rinse could not only compensate for the deterioration of adsorption capacity resulting from impregnation, but further improve the purification efficiency.

高温变压吸附是一种新开发的气体净化技术，其中通过添加蒸汽冲洗和吹扫可以显着提高产物气体的回收率。此外，高温工业合成气可以在高温下直接纯化，因此纯化过程中的温度变化不像Selexol，Retisol或其他方法那样大，这有利于简化热管理并提高能源效率。在约200°C的工作温度下，活性炭被认为是一种很有前途的吸附剂。但是，活性炭在冲洗和吹扫过程中也会吸附大量蒸汽，这会影响其吸附能力。在此，通过浸渍合成疏水性活性炭并进行表征，与水滴的接触角高达134°。当暴露于湿空气中时，疏水性吸附剂的重量增加了0.3％，而商用活性炭的重量增加了约12％，这主要归因于蒸气吸附。一氧化碳₂吸附能力是在潮湿条件下于200°C的固定床上测试的。蒸汽对疏水性吸附剂的影响远小于对市售吸附剂的影响。当商业活性炭在1 atm的蒸汽下运行时，工作容量从0.091降低到0.009 mmol / g，而疏水材料在相同条件下（约0.05 mmol / g）表现出稳定且理想的工作容量。事实证明，蒸汽冲洗和吹扫对于疏水性吸附剂是可行的，蒸汽冲洗的引入不仅可以弥补浸渍引起的吸附能力下降，而且可以进一步提高净化效率。