Abstract
The influence of the addition of metal oxide catalysts on transferable hydrogen in petroleum residue was studied by 1H-NMR technique with a particular focus on mesophase development. Solid catalysts such as SiO2-Al2O3, MoO3-TiO2 and β-Al2O3 decreased the transferable hydrogen from Wafra vacuum residue on heating up to 673K and reduced the size of optical texture of the resultant cokes. On the other hand, SeO2 markedly revealed the promotion of hydrogen transfer in vacuum residues and considerably enlarged the size of optical texture. The catalytic activity in vacuum residue/D2O systems over catalyst was investigated by D-NMR technique. Deuterium incorporation of D2O into petroleum residue in the region of aliphatic hydrogens was recognized with SeO2 catalyst, whereas exchange in the aromatic region was noted for SiO2-Al2O3 catalyst. Transferable hydrogen associated with the skeleton of hydrocarbons is one of the keys controlling the carbonization reaction of petroleum residues and pitches.
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