1 ноември 2020
Nikolova, D., Edreva-Kardjieva, R., Kolev, H., Gabrovska, M..
(
Димитринка Николова;
Маргарита Габровска;
Христо Колев;
)
Abstract
Series of Re2O7/?-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.
Catalysis Today, 357, Elsevier, 2020, ISSN:0920-5861, eISSN: 1873-4308, DOI:https://doi.org/10.1016/j.cattod.2019.05.038, 590-601. JCR-IF (Web of Science):4.888 Q1, не оглавява ранглистата (Web of Science)
https://www.sciencedirect.com/science/article/pii/S0920586119302470
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