Sorption-enhanced reverse water–gas shift (SE-RWGS, here designated as ‘COMAX’) was studied with bifunctional reactive sorbents. First proof-of-concept is presented of the successful design of a multifunctional reactive sorbent, which combines CO₂ activation and water adsorption functionalities in an integrated reactive sorbent, i.e. the active phase is loaded on the carrier that provides surface area for dispersion of the active (Pt, Cu) phase as well as H₂O sorption capacity. Near complete selectivity to CO was achieved from atmospheric pressure up to at least 29 bar, i.e. the highest pressure studied in the experimental campaign. This selectivity was obtained with stoichiometric and excess quantities of hydrogen in the (RWGS) COMAX feed, the latter in view of the potential use of syngas mixtures. The newly developed bifunctional material bears important additional advantage for scaling up of the COMAX process, because it avoids the mixing of catalyst and adsorbent materials that differ in properties such as hardness. Evidently, the key parameter for optimizing the COMAX process is the working adsorption capacity of the system and (multi-column) cycle design. Improving the capacity can be done by optimizing the reactive adsorption conditions and by optimizing the regeneration method.

Graphic Abstract

中文翻译：

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反应性吸水剂可增强吸附的反向水气转换

使用双功能反应性吸附剂研​​究了增强吸附的反向水煤气变换（SE-RWGS，在此称为“ COMAX”）。提出了多功能反应性吸附剂成功设计的第一个概念验证，它在集成的反应性吸附剂中结合了CO ₂活化和水吸附功能，即活性相负载在载体上，为载体的分散提供了表面积活性（Pt，Cu）相以及H ₂O的吸附能力。从大气压到至少29 bar，即实验中研究的最高压力，可以实现对CO的几乎完全选择性。考虑到合成气混合物的潜在用途，在（RWGS）COMAX进料中使用化学计量的氢气和过量的氢气获得了这种选择性。新开发的双功能材料还具有扩大COMAX工艺规模的重要附加优势，因为它避免了性质不同（例如硬度）的催化剂和吸附剂材料的混合。显然，优化COMAX工艺的关键参数是系统的工作吸附能力和（多柱）循环设计。可以通过优化反应性吸附条件和优化再生方法来提高容量。

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