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Profound synergetic effect of metal oxide promoters and TiO2–SiO2 binary support in cobalt Fischer‐Tropsch catalyst
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2019-12-13 , DOI: 10.1002/jccs.201900326
Elham Yaghoobpour 1 , Yahya Zamani 1 , Saeed Zarrinpashne 1 , Akbar Zamaniyan 1
Affiliation  

A series of cobalt catalysts supported on TiO2, SiO2, 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), H2‐TPR, NH3‐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 H2 to CO ratio of 2. The results indicate that CeO2 and ZrO2 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 V2O5 as a promoter undesirably suppressed CO conversion and, consequently, catalytic performance. The results show that the catalyst included CeO2, was supported on a binary mixture of SiO2 and TiO2, and has significant improved activity and C5+ selectivity. From the reactor test, values of 156.48 mmol COconv./gCo/h activity, and 0.17 gC3+/(h.gcat.) productivity have been obtained for this catalyst.

中文翻译:

费-托钴催化剂中金属氧化物促进剂和TiO2-SiO2二元载体的协同作用

使用初期湿润浸渍法制备了一系列负载在TiO 2,SiO 2或它们的混合物上的钴催化剂,并与过渡金属的第III,IV和V组添加了一些氧化物。为了更好地评估催化剂,使用布鲁诺·埃默特勒(BET),H 2‐ TPR,NH 3 ‐TPD,X射线衍射,X射线光电子能谱和透射电子显微镜技术研究了催化剂的理化性质。在固定床反应器中于220°C,24 bar,气时空速(GHSV)为2 L / h / gcat。,H 2 / CO比为2的条件下研究了催化剂的性能。结果表明CeO 2和ZrO 2因为助催化剂可以提高一氧化碳的转化率和催化剂活性,并提高高分子量产物的选择性。相反,V 2 O 5作为助催化剂的存在不希望地抑制了CO转化,因此抑制了催化性能。结果表明,该催化剂包括CeO 2,负载在SiO 2和TiO 2的二元混合物上,并具有明显改善的活性和C 5 +选择性。从反应器测试中,对于该催化剂,获得了156.48mmol COconv./gCo/h活性和0.17gC 3 + /(h.gcat。)生产率的值。
更新日期:2019-12-13
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