Research on Vanadium Compounds Produced in Catalyst of MgO-CaO-Al₂0₃-NiO System during Catalytic Cracking of Petroleum

Abstract

Catalytic activity of MgO-CaO-A120s-NiO for cracking of petroleum was gradually decreased when petroleum of some kinds was used.
As a result of X-ray and chemical analysis of that catalyst whose activity had been decreased, alarge amount of V205 an.d newly produced minera s were recognized.
In order to investigate the cause of decreasing activity, further studies on chemical composition of these new minerals considered to result from V20s, was carried out.
The chemical compositions of two minerals are as follows:
1) 3MgO.V20s, Orthorohombic system, lattice censtant a=8.32, b=11.43, c=6.05
2) 3(Ca, Mg)O.V20s, Hexagenal system, lattice cerstaftt a=10.365, c=37.058
It may be possible that these minerals produced in the catalyst form solid solution with the c ositions of 3(Mg..xNix)O, V205 and 3(Ca, Mgi-ptNix)O, 2 V, O, by replacing a part of MgO in these minerals with NiO.