Abstract The naphthenic acids (NAs) present in the crude oil can lead to the corrosion problems in oil refinery equipment apart from reduces the performances of the oil. In this study, the method to remove NA were done by means of extraction using sodium thiocyanate in ethanol with the aid of Ni/Ca/Al2O3 and Ni/Ce/Al2O3 catalysts at 27 °C reaction temperature. The catalyst was prepared by incipient wetness impregnation method (IWI) and calcined at three different temperature, 800, 900 and 1000 °C respectively. The efficiency of the extraction was affected by the catalyst calcination temperature. Both catalysts calcined at 800 and 900 °C gave total acid number (TAN) value more than 1 mg KOH/g while by using Ni/Ca(10:90)/Al2O3 and Ni/Ce(10:90)/Al2O3 calcined at 1000 °C the TAN value were reduced to 0.28 and 0.65 mg KOH/g respectively. Brunauer-Emmett Teller (BET) result shows both catalysts have large surface area that provide more reaction cites when calcined at 1000 °C. X-ray Diffraction Spectroscopy (XRD) analysis of Ni/Ca/Al2O3 catalyst revealed that the active site was dominated by the Al2O3 species while CeO2 was the active site for Ni/Ce/Al2O3 catalyst. In conclusion, both catalysts reduced the TAN value of acidic crude oil efficiently.

中文翻译：

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Ni/Ce/Al2O3和Ni/Ca/Al2O3催化硫氰酸钠乙醇脱石油原油中环烷酸的研究

摘要 原油中存在的环烷酸（NAs）除了会降低油品的性能外，还会导致炼油设备的腐蚀问题。在本研究中，在 27 °C 反应温度下，借助 Ni/Ca/Al2O3 和 Ni/Ce/Al2O3 催化剂，在乙醇中使用硫氰酸钠萃取来去除 NA。该催化剂采用初湿浸渍法（IWI）制备，并分别在800、900和1000℃三种不同温度下煅烧。萃取效率受催化剂煅烧温度的影响。在 800 和 900 °C 下煅烧的两种催化剂的总酸值 (TAN) 值均超过 1 mg KOH/g，而通过使用1000 °C 时，TAN 值分别降至 0.28 和 0.65 mg KOH/g。Brunauer-Emmett Teller (BET) 结果表明，两种催化剂都具有较大的表面积，在 1000 °C 下煅烧时可提供更多的反应位点。Ni/Ca/Al2O3 催化剂的 X 射线衍射光谱 (XRD) 分析表明，活性位点以 Al2O3 物质为主，而 CeO2 是 Ni/Ce/Al2O3 催化剂的活性位点。总之，两种催化剂都有效地降低了酸性原油的 TAN 值。