The oxidation of dibenzothiophene（DBT） in decalin（as solvent） was conducted using oil-soluble oxidant tert-amyl hydroperoxide（TAHP）.The effects of oxidant amount,reaction temperature,reaction time and catalyst w...The oxidation of dibenzothiophene（DBT） in decalin（as solvent） was conducted using oil-soluble oxidant tert-amyl hydroperoxide（TAHP）.The effects of oxidant amount,reaction temperature,reaction time and catalyst were investigated in detail.The results showed that under the condition of ratio of TAHP to sulfur 3∶1,reaction temperature 90℃,reaction time 3h,the desulfurization rate was up to 95%.The catalyst was necessary to oxidize DBT with TAHP.Weak acid cationic exchange resin of "D113" large aperture acrylic acid series supported MoO3 catalyst has relatively high activities.After the repetitious use as catalyst for 10 times,it still has good activity.展开更多
The oxidation of dibenzothiophene(DBT) in decalin(as solvent) was conducted using oil-soluble oxidant cyclohexanone peroxide(CYHPO).The effects of oxidant amount,reaction temperature,reaction time were investigated in...The oxidation of dibenzothiophene(DBT) in decalin(as solvent) was conducted using oil-soluble oxidant cyclohexanone peroxide(CYHPO).The effects of oxidant amount,reaction temperature,reaction time were investigated in detail.The results showed that under the condition of ratio of CYHPO to sulfur 2.5∶1,reaction temperature 100℃ and reaction time 3h,the desulfurization rate was up to 87%.The little water produced after oxidation was removed by molecular sieve adsorption.The recovery ratio of model oil was up to 98% after the treatment with centrifugation and adsorption.展开更多
Homogeneous oxidation using an oil-soluble oxidant,tert-amyl hydroperoxide(TAHP),for ultra-deep desulfurization was performed under mild conditions in the presence of molybdenum oxide catalysts.Dibenzothio-phene(DBT),...Homogeneous oxidation using an oil-soluble oxidant,tert-amyl hydroperoxide(TAHP),for ultra-deep desulfurization was performed under mild conditions in the presence of molybdenum oxide catalysts.Dibenzothio-phene(DBT),benzothiophene(BT) and 4,6-dimethyl-dibenzothiophene(DMDBT),which are the refractory sulfur compounds for hydrodesulfurization(HDS),were employed as model substrates for a simulated diesel fuel.Activity of molybdenum oxide supported on a macroporous weak acidic resin was investigated.The mass conversion of DBT reached near 100% at 90°C and a TAHP/DBT molar ratio of 3 with 1% of molybdenum oxide supported on Amberlite IRC-748 resin for 1 h.It was further found that the activities of the model substrates decreased in the or-der of DMDBT>DBT>BT.In the flow oxidation using TAHP as the oxidant,mass conversion of DBT increased remarkably from 61.3% to 98.5% when dropping the weight hourly space velocity(WHSV) from 40 h-1 to 10 h-1.A series of experiments dealt with selectivity of this oxidation using TAHP revealed that the model unsaturated compounds,i.e.4,6,8-trimethyl-2-nonylene,and 2-methylnaphthalene did not affect the oxidation of DBT.Car-bazole had nearly no effect on the conversion of DBT using TAHP,but had some influence on the one using tert-butyl hydroperoxide(TBHP).The mass conversion of DBT decreased remarkably from 75.2% to 3.6% when the content of carbazole increased from 0 to 500 μg·g-1.In the flow oxidation using TAHP as the oxidant,the concentration of DBT in model fuels was reduced from 500 μg·g-1 to 7.2 μg·g-1 at WHSV of 10 h-1,and then reduced to 3.8 μg·g-1 by adsorption of Al2O3.展开更多
Amination of tertiary and secondary alcohols using aqueous ammonia as nitrogen source was carried out by a process with recyclable intramolecular reaction of 1,8-naphthosultone, which lead to α-branched primary amine...Amination of tertiary and secondary alcohols using aqueous ammonia as nitrogen source was carried out by a process with recyclable intramolecular reaction of 1,8-naphthosultone, which lead to α-branched primary amines. Sulfonic resin serves as the heterogeneous catalyst for C N bond formation and protects the neighboring hydroxyl group until the required hydrolysis starts in the alkaline solution. The process can be conducted under mild conditions, no additional solvent is needed and no overreaction to secondary or tertiary amines occurs.展开更多
文摘The oxidation of dibenzothiophene（DBT） in decalin（as solvent） was conducted using oil-soluble oxidant tert-amyl hydroperoxide（TAHP）.The effects of oxidant amount,reaction temperature,reaction time and catalyst were investigated in detail.The results showed that under the condition of ratio of TAHP to sulfur 3∶1,reaction temperature 90℃,reaction time 3h,the desulfurization rate was up to 95%.The catalyst was necessary to oxidize DBT with TAHP.Weak acid cationic exchange resin of "D113" large aperture acrylic acid series supported MoO3 catalyst has relatively high activities.After the repetitious use as catalyst for 10 times,it still has good activity.
文摘The oxidation of dibenzothiophene(DBT) in decalin(as solvent) was conducted using oil-soluble oxidant cyclohexanone peroxide(CYHPO).The effects of oxidant amount,reaction temperature,reaction time were investigated in detail.The results showed that under the condition of ratio of CYHPO to sulfur 2.5∶1,reaction temperature 100℃ and reaction time 3h,the desulfurization rate was up to 87%.The little water produced after oxidation was removed by molecular sieve adsorption.The recovery ratio of model oil was up to 98% after the treatment with centrifugation and adsorption.
基金Supported by Program for Changjiang Scholars and Innovative Research Team in University
文摘Homogeneous oxidation using an oil-soluble oxidant,tert-amyl hydroperoxide(TAHP),for ultra-deep desulfurization was performed under mild conditions in the presence of molybdenum oxide catalysts.Dibenzothio-phene(DBT),benzothiophene(BT) and 4,6-dimethyl-dibenzothiophene(DMDBT),which are the refractory sulfur compounds for hydrodesulfurization(HDS),were employed as model substrates for a simulated diesel fuel.Activity of molybdenum oxide supported on a macroporous weak acidic resin was investigated.The mass conversion of DBT reached near 100% at 90°C and a TAHP/DBT molar ratio of 3 with 1% of molybdenum oxide supported on Amberlite IRC-748 resin for 1 h.It was further found that the activities of the model substrates decreased in the or-der of DMDBT>DBT>BT.In the flow oxidation using TAHP as the oxidant,mass conversion of DBT increased remarkably from 61.3% to 98.5% when dropping the weight hourly space velocity(WHSV) from 40 h-1 to 10 h-1.A series of experiments dealt with selectivity of this oxidation using TAHP revealed that the model unsaturated compounds,i.e.4,6,8-trimethyl-2-nonylene,and 2-methylnaphthalene did not affect the oxidation of DBT.Car-bazole had nearly no effect on the conversion of DBT using TAHP,but had some influence on the one using tert-butyl hydroperoxide(TBHP).The mass conversion of DBT decreased remarkably from 75.2% to 3.6% when the content of carbazole increased from 0 to 500 μg·g-1.In the flow oxidation using TAHP as the oxidant,the concentration of DBT in model fuels was reduced from 500 μg·g-1 to 7.2 μg·g-1 at WHSV of 10 h-1,and then reduced to 3.8 μg·g-1 by adsorption of Al2O3.
基金Supported by the National Natural Science Foundation of China(21076036)
文摘Amination of tertiary and secondary alcohols using aqueous ammonia as nitrogen source was carried out by a process with recyclable intramolecular reaction of 1,8-naphthosultone, which lead to α-branched primary amines. Sulfonic resin serves as the heterogeneous catalyst for C N bond formation and protects the neighboring hydroxyl group until the required hydrolysis starts in the alkaline solution. The process can be conducted under mild conditions, no additional solvent is needed and no overreaction to secondary or tertiary amines occurs.
