TiO2 treated in hydrogen atmosphere showed enhanced photocatalytic activity in degrading the sulfosalicylic acid （SSal）.The results of the electrochemical impedance spectroscopy （EIS） investigation showed that the...TiO2 treated in hydrogen atmosphere showed enhanced photocatalytic activity in degrading the sulfosalicylic acid （SSal）.The results of the electrochemical impedance spectroscopy （EIS） investigation showed that the diameters of the capacitive arcs for the H-TiO2 were much smaller than those of bare TiO2 and thermally treated TiO2 in air,indicating that the charge transfer of the H-TiO2 occurs more rapidly,thus inviting a higher photocatalytic activity.When an external bias was applied on the H-TiO2,the arc of the EIS Nyquist plot decreased obviously than without the bias,suggesting more efficient separation of the photo-generated carriers.展开更多
The removal of sulfur and changes of sulfur forms in Oman vacuum residue by hydrotreating were investigated on a pilot plant.The results illustrated that the content of total sulfur in hydrotreated residue reduced gra...The removal of sulfur and changes of sulfur forms in Oman vacuum residue by hydrotreating were investigated on a pilot plant.The results illustrated that the content of total sulfur in hydrotreated residue reduced gradually with the hydrotreating.Over 80% of total sulfur in the residue can be removed at three temperatures(T-5 ℃,T ℃,T+5 ℃),although a higher temperature can enhance the desulfurization effect.The residue fractions of aromatic,resin,asphaltene and saturate contain about 60%,32%,8% and 1% of total sulfur,respectively;however,the sulfur content in each fraction is in the order of asphaltene>resin>aromatic>saturate.The sulfidic sulfur content in the residue fraction decreased and the thiophenic sulfur content increased with the heaviness of residue fraction.Sulfur forms exhibit influence on the hydrodesulfurization effect;the removal of sulfidic sulfur is much easier than that of thiophenic sulfur.The residue fractions are also different in the desulphurization effect,depending on their molecular size and structure;the sulfur removal ratio of saturate and aromatic is higher than that of resin and asphaltene.展开更多
文摘TiO2 treated in hydrogen atmosphere showed enhanced photocatalytic activity in degrading the sulfosalicylic acid （SSal）.The results of the electrochemical impedance spectroscopy （EIS） investigation showed that the diameters of the capacitive arcs for the H-TiO2 were much smaller than those of bare TiO2 and thermally treated TiO2 in air,indicating that the charge transfer of the H-TiO2 occurs more rapidly,thus inviting a higher photocatalytic activity.When an external bias was applied on the H-TiO2,the arc of the EIS Nyquist plot decreased obviously than without the bias,suggesting more efficient separation of the photo-generated carriers.
文摘The removal of sulfur and changes of sulfur forms in Oman vacuum residue by hydrotreating were investigated on a pilot plant.The results illustrated that the content of total sulfur in hydrotreated residue reduced gradually with the hydrotreating.Over 80% of total sulfur in the residue can be removed at three temperatures(T-5 ℃,T ℃,T+5 ℃),although a higher temperature can enhance the desulfurization effect.The residue fractions of aromatic,resin,asphaltene and saturate contain about 60%,32%,8% and 1% of total sulfur,respectively;however,the sulfur content in each fraction is in the order of asphaltene>resin>aromatic>saturate.The sulfidic sulfur content in the residue fraction decreased and the thiophenic sulfur content increased with the heaviness of residue fraction.Sulfur forms exhibit influence on the hydrodesulfurization effect;the removal of sulfidic sulfur is much easier than that of thiophenic sulfur.The residue fractions are also different in the desulphurization effect,depending on their molecular size and structure;the sulfur removal ratio of saturate and aromatic is higher than that of resin and asphaltene.
