Sorption-enhanced methanation (SEM) is one of the solutions proposed for the production of high quality synthetic natural gas (SNG) under mild conditions of temperature and pressure. In this novel process, the methanation reaction is performed in the presence of an adsorbent that retains the water produced as by-product. The SEM potential of a Rh-based catalyst and a zeolite 5A adsorbent has been demonstrated for both CO and CO₂ hydrogenation. Pure CH₄ production was possible operating at 275 °C and atmospheric pressure under sorption-enhanced CO₂ methanation conditions for space velocities of up to 514 ml_CO2/g_cat/h. For sorption-enhanced CO methanation, CH₄ purities of 86 vol% were achieved under the same operating conditions but at lower space velocity (440 ml_CO/g_cat/h). Finally, SEM/regeneration cycles were performed for a feed gas containing CO and CO₂, achieving stable performance throughout the cycles and a constant CH₄ purity of about 60 vol% for the operating conditions chosen.

吸附增强甲烷化 (SEM) 是在温和的温度和压力条件下生产高质量合成天然气 (SNG) 的解决方案之一。在这种新颖的方法中，甲烷化反应是在吸附剂存在的情况下进行的，吸附剂可以保留作为副产品产生的水。Rh 基催化剂和沸石 5A 吸附剂的 SEM 潜力已被证明可用于 CO 和 CO ₂加氢。纯 CH ₄生产可以在 275 °C 和大气压下在吸附增强的 CO ₂甲烷化条件下操作，空速高达 514 ml _CO2 /g _cat /h。对于吸附增强的 CO 甲烷化，CH ₄在相同的操作条件下但在较低的空速 (440 ml _CO /g _cat /h) 下实现了 86 vol% 的纯度。_{最后，对含有 CO 和 CO 2}的原料气进行 SEM/再生循环，在整个循环中实现稳定的性能，并在所选操作条件下实现约 60 vol%的恒定 CH _4纯度。