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- W2085243169 abstract "Abstract Precedents in the literature point out that vanadylporphyrins, one of the main contaminants in heavy crude oils, can be demetalated in solution under reducing conditions. Based on this observation, the potential demetalating activity of three homogeneous reductive catalysts for vanadylporphyrins was studied. The reactions were carried out in 125 ml Parr minireactors, in CH 2 Cl 2 solutions, under H 2 /CO atmospheres, at different temperatures, pressures and reaction times. It was found that, RhCl(PPh 3 ) and Co 2 (CO) 8 partially reduced vanadylporphyrins to vanadylchlorins, while RuHCl(CO)(PPh 3 ) 3 completely demetalated the vanadyl complexes of tetraphenylporphyrin and octaethylporphyrin in 24 h, at 150°C and 70 atm of H 2 in the presence of diethylamine and acetone. This homogeneous system represents an alternate method to the conventional hydrodemetalation process, which so far involves heterogeneous systems." @default.
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- W2085243169 date "1986-04-01" @default.
- W2085243169 modified "2023-09-27" @default.
- W2085243169 title "Catalytic reductive demetalation of vanadylporphyrins in solution" @default.
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- W2085243169 doi "https://doi.org/10.1016/s0166-9834(00)82631-7" @default.
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