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Profound synergetic effect of metal oxide promoters and TiO 2 –SiO 2 binary support in cobalt Fischer‐Tropsch catalyst
Author(s) -
Yaghoobpour Elham,
Zamani Yahya,
Zarrinpashne Saeed,
Zamaniyan Akbar
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201900326
Subject(s) - catalysis , space velocity , chemistry , incipient wetness impregnation , cobalt , x ray photoelectron spectroscopy , transition metal , selectivity , fischer–tropsch process , cobalt oxide , inorganic chemistry , oxide , nuclear chemistry , chemical engineering , organic chemistry , engineering
Abstract A series of cobalt catalysts supported on TiO 2 , SiO 2 , or a mixture of them, incorporated with some added oxides from Groups III, IV, and V of transition metals, were prepared using the incipient wetness impregnation method. For better evaluation of catalysts, the physicochemical properties of catalysts were investigated using brunauer‐emmett‐teller (BET), H 2 ‐TPR, NH 3 ‐TPD, X‐ray diffraction, X‐ray photoelectron spectroscopy, and transmission electron microscopy techniques. The performance of catalysts was studied in a fixed‐bed reactor at 220°C, 24 bar, gas hourly space velocity (GHSV) of 2 L/h/gcat., and H 2 to CO ratio of 2. The results indicate that CeO 2 and ZrO 2 as promoters can enhance the CO conversion and catalyst activity and enhance the selectivities of higher‐molecular‐weight products. On the contrary, the presence of V 2 O 5 as a promoter undesirably suppressed CO conversion and, consequently, catalytic performance. The results show that the catalyst included CeO 2 , was supported on a binary mixture of SiO 2 and TiO 2 , and has significant improved activity and C 5 + selectivity. From the reactor test, values of 156.48 mmol COconv./gCo/h activity, and 0.17 gC 3 + /(h.gcat.) productivity have been obtained for this catalyst.