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Promoted Re/Al2O3 systems as sour water-gas shift catalysts
Catalysis Today ( IF 5.2 ) Pub Date : 2019-05-20 , DOI: 10.1016/j.cattod.2019.05.038
D. Nikolova , R. Edreva-Kardjieva , H. Kolev , M. Gabrovska

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.



中文翻译:

改良的Re / Al 2 O 3系统作为酸性水煤气变换催化剂

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。

更新日期:2019-05-20
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