The content and ratio of metal elements V and Ni in crude oil play an important role in understanding the characterizing depositional environment and organic matter types of crude oil. However, in the process of crude oil refining. V and Ni, as harmful metal elements in the catalytic cracking process of crude oil, will reduce the activity of the catalyst, and even lead to poisoning of the catalyst and serious corrosion of equipment, Before refining, V and Ni must be removed from the crude oil. In addition, V and Ni are mutagenic and carcinogenic, and it is becoming increasingly important to id...
