Series of Re₂O₇/γ-Al₂O₃ catalysts promoted with Ni, Co, and K were studied as sour gas shift catalysts. Samples were prepared by consecutive incipient wetness impregnation. Catalytic measurements were performed in a fixed bed reactor at atmospheric pressure in the range of 180–400 °C at GHSV of 4000 h⁻¹ and steam/gas ratio of 0.3. The samples were characterised by means of N₂ physisorption, X-ray diffraction, diffuse reflectance UV–vis spectroscopy, and X-ray photoelectron spectroscopy.

It was found that oxidation state ratio of rhenium sulphidic to rhenium oxygen-containing species, namely Re⁴⁺/(Re⁷⁺(+Re⁶⁺)), gives important information about redox relationship between Re⁴⁺ and Re⁷⁺ oxidation states according to additive type (K, Ni, and Co) and combinations among them.

Three factors, namely, uniform deposition of K-Co-Re species on carrier surface, balance between Re sulphidic and oxidic species, and synergism among components were beneficial to the highest activity of KCoRe catalyst. This system was considered a promising catalyst for water-gas shift reaction with sulphur-containing feed in the 250–400 °C temperature range.

回复的系列₂ ö ₇ /γ-Al系_2层ö ₃与镍，钴，和K促进的催化剂进行了研究作为酸气变换催化剂。通过连续的初期湿润浸渍来制备样品。催化测量是在固定床反应器中在180–400°C的大气压下进行的，GHSV为4000 h ^-1且蒸汽/气体比为0.3。样品通过N ₂物理吸附，X射线衍射，漫反射紫外可见光谱和X射线光电子能谱进行表征。

发现硫化rh与含rh氧物种的氧化态比率Re ⁴⁺ /（Re ⁷ +（+ Re ⁶⁺））给出了有关Re ⁴⁺与Re ⁷⁺氧化态之间氧化还原关系的重要信息。根据添加剂类型（K，Ni和Co）及其组合来确定。

三个因素，即K-Co-Re物种在载体表面上的均匀沉积，Re硫和氧化物种之间的平衡以及组分之间的协同作用，有利于KCoRe催化剂的最高活性。该系统被认为是在250–400°C温度范围内与含硫进料进行水煤气变换反应的有前途的催化剂。