Sulfonated carbon as a strong and stable solid acid catalyst exhibited excellent catalytic performance in various acid-catalyzed reactions. Here, sulfonated carbon, as catalyst for oxidation reaction, was prepared via...Sulfonated carbon as a strong and stable solid acid catalyst exhibited excellent catalytic performance in various acid-catalyzed reactions. Here, sulfonated carbon, as catalyst for oxidation reaction, was prepared via the carbonization of starch followed by sulfonation with concentrated sulfuric acid. N2 physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray fluorescence and acid-base titration were used to characterize the obtained materials. The catalytic activity of sulfonated carbon was studied in the oxidation of aldehydes to carboxylic acids using 30 wt% H2O2 as oxidant. This oxidation protocol works well for various aldehydes including aromatic and aliphatic aldehydes. The sulfonated carbon can be recycled for three times without obvious loss of activity.展开更多
Oxygen evolution reaction(OER)plays a crucial role in developing energy conversion and adjusting electronic structure of the electrocatalysts can effectively improve the catalytic activity and stability.However,it is ...Oxygen evolution reaction(OER)plays a crucial role in developing energy conversion and adjusting electronic structure of the electrocatalysts can effectively improve the catalytic activity and stability.However,it is a challenge to adjust the electronic structure on two-dimensional iridium dioxide nanosheets(IrO_(2)NS),which have the advantages of high atom utilization.Here,we regulate the surface properties of IrO_(2)NS through sulfonated carbon dots(SCDs)to promote the OER catalytic process.The catalyst IrO_(2)NS/SCDs-2 exhibited excellent catalytic activity with a lower overpotential of 180 mV than IrO_(2)NS(230 mV)at the current density of 10 mA·cm^(-2)in a 0.5 M H_(2)SO_(4) solution.And after 160 h of stability testing,the overpotential of IrO_(2)NS/SCDs-2 only decreased by 4 mV.Moreover,transient potential scanning test can visually demonstrate that the addition of SCDs improves the conductivity of the catalyst and increases the electron transfer rate.展开更多
This work presents the formation of butyl levulinate,a potential fuel additive,and an excellent renewable chemical obtained by the butanolysis of furfuryl alcohol(FAL)over a solid acid catalyst.The butanolysis of furf...This work presents the formation of butyl levulinate,a potential fuel additive,and an excellent renewable chemical obtained by the butanolysis of furfuryl alcohol(FAL)over a solid acid catalyst.The butanolysis of furfuryl alcohol reaction is a strong function of acidity for which tungstated zirconia(WO_(3)-ZrO_(2)),a robust solid acid catalyst,and a sulfonated carbon catalyst were employed to produce high yields of butyl levulinate targeting a lower initial molar ratio of butanol to FAL.A maximum of 28 mol%yield of butyl levulinate was obtained with tungstated zirconia catalyst.Easily prepared sulfonated carbon catalyst at high reaction temperatures facilitated the complete conversion of reaction intermediate,2-butoxymethylfuran(2-BMF)through which butyl levulinate was formed,and as high as 80 mol%of butyl levulinate yield was produced at an initial mole ratio of 8.5:1 of butanol to FAL.The better results of sulfonated carbon catalyst could be attributed to the presence of-SO3H,carboxylic acid,and phenolic OH groups on the carbon surface.展开更多
Synthesis of functionalized mesoporous carbon by an easy-accessed method is of great importance towards its practical applications.Herein,an evaporation induced self-assembly/carbonization（EISAC）method was developed...Synthesis of functionalized mesoporous carbon by an easy-accessed method is of great importance towards its practical applications.Herein,an evaporation induced self-assembly/carbonization（EISAC）method was developed and applied to the synthesis of sulfonic acid group functionalized mesoporous carbon（SMC）.The final mesoporous carbon obtained by EISAC method possesses wormlike mesoporous structure,uniform pore size（3.6 nm）,large surface area of 735 m^2/g,graphitic pore walls and rich sulfonic acid group.Moreover,the resultant mesoporous carbon achieves a superior electrochemical capacitive performances（216 F/g） to phenolic resin derived mesoporous carbon（OMC,152 F/g） and commercial activated carbon（AC,119 F/g）.展开更多
Waste H_(2)SO_(4)from industrial isobutane alkylation,a hazardous thick liquid with a high concentration of acid soluble oil(ASO)impurities,poses challenges in the regeneration process.Herein,an innovative low-tempera...Waste H_(2)SO_(4)from industrial isobutane alkylation,a hazardous thick liquid with a high concentration of acid soluble oil(ASO)impurities,poses challenges in the regeneration process.Herein,an innovative low-temperature carbonization process was proposed to convert waste H_(2)SO_(4)into the regenerated concentrated H_(2)SO_(4)and sulfonated activated carbon materials(SACMs)under mild reaction conditions.The optimal reaction temperature is identified at 423.15 K with the highest total organic carbon(TOC)removal of 90.57%.The high-purity regenerated H_(2)SO_(4)with a concentration of 95%as a catalyst for isobutane alkylation exhibits excellent catalytic performance with 94.54 research octane number(RON)of the alkylate.SACMs,characterized as a novel porous carbon material with plentiful hydroxyl,carboxylic acid,and sulfonic acid functional groups,demonstrate an efficient catalytic activity in the dimerization of lactic acid to produce lactide with a yield of 46.95%.Hopefully,the novel recovery process provides a promising application to optimize the regeneration process of waste H_(2)SO_(4)from industrial isobutane alkylation.展开更多
The oxidation of organic compounds by sulfonated porous carbon and H2O2 was studied at room temperature. Alkyl and aryl sulfides were oxidized to the corresponding sulfoxides or sulfones in excellent yields. Secondary...The oxidation of organic compounds by sulfonated porous carbon and H2O2 was studied at room temperature. Alkyl and aryl sulfides were oxidized to the corresponding sulfoxides or sulfones in excellent yields. Secondary alcohols were also converted to the corresponding esters/lactones and aldehydes to methyl esters in good yields. Moreover,aliphatic tertiary amines and substituted pyridines were oxidized to N-oxides.展开更多
基金supported by the National Nature Science Foundation of China (J1210060, 21143002)
文摘Sulfonated carbon as a strong and stable solid acid catalyst exhibited excellent catalytic performance in various acid-catalyzed reactions. Here, sulfonated carbon, as catalyst for oxidation reaction, was prepared via the carbonization of starch followed by sulfonation with concentrated sulfuric acid. N2 physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray fluorescence and acid-base titration were used to characterize the obtained materials. The catalytic activity of sulfonated carbon was studied in the oxidation of aldehydes to carboxylic acids using 30 wt% H2O2 as oxidant. This oxidation protocol works well for various aldehydes including aromatic and aliphatic aldehydes. The sulfonated carbon can be recycled for three times without obvious loss of activity.
基金supported by Natural Science Foundation of Jiangsu Province(No.BK20220028)the National Key R&D Program of China(Nos.2020YFA0406104 and 2020YFA0406101)+2 种基金the National Natural Science Foundation of China(Nos.52271223,52272043,52202107,52201269,22273063 and 52302296)the Science and Technology Development Fund,Macao SAR(No.0009/2022/ITP)Collaborative Innovation Center of Suzhou Nano Science and Technology,the 111 Project and Suzhou Key Laboratory of Functional Nano and Soft Materials.
文摘Oxygen evolution reaction(OER)plays a crucial role in developing energy conversion and adjusting electronic structure of the electrocatalysts can effectively improve the catalytic activity and stability.However,it is a challenge to adjust the electronic structure on two-dimensional iridium dioxide nanosheets(IrO_(2)NS),which have the advantages of high atom utilization.Here,we regulate the surface properties of IrO_(2)NS through sulfonated carbon dots(SCDs)to promote the OER catalytic process.The catalyst IrO_(2)NS/SCDs-2 exhibited excellent catalytic activity with a lower overpotential of 180 mV than IrO_(2)NS(230 mV)at the current density of 10 mA·cm^(-2)in a 0.5 M H_(2)SO_(4) solution.And after 160 h of stability testing,the overpotential of IrO_(2)NS/SCDs-2 only decreased by 4 mV.Moreover,transient potential scanning test can visually demonstrate that the addition of SCDs improves the conductivity of the catalyst and increases the electron transfer rate.
基金supported in part by Japan Science and Technology Agency Strategic International Collaborative Research Program(JST SICORP)Grant Number JPMJSC18H1,Japan.U.Rthe financial support by JICA IITH-FRIENDSHIP(D1956755)scholarship for suppoeting this study。
文摘This work presents the formation of butyl levulinate,a potential fuel additive,and an excellent renewable chemical obtained by the butanolysis of furfuryl alcohol(FAL)over a solid acid catalyst.The butanolysis of furfuryl alcohol reaction is a strong function of acidity for which tungstated zirconia(WO_(3)-ZrO_(2)),a robust solid acid catalyst,and a sulfonated carbon catalyst were employed to produce high yields of butyl levulinate targeting a lower initial molar ratio of butanol to FAL.A maximum of 28 mol%yield of butyl levulinate was obtained with tungstated zirconia catalyst.Easily prepared sulfonated carbon catalyst at high reaction temperatures facilitated the complete conversion of reaction intermediate,2-butoxymethylfuran(2-BMF)through which butyl levulinate was formed,and as high as 80 mol%of butyl levulinate yield was produced at an initial mole ratio of 8.5:1 of butanol to FAL.The better results of sulfonated carbon catalyst could be attributed to the presence of-SO3H,carboxylic acid,and phenolic OH groups on the carbon surface.
基金supported by the Ministry of Science and Technology of China(No.2009CB623504)the National Science Foundation of China(Nos.20773062,20773063,21173119,and21273109)the Fundamental Research Funds for the Central Universities
文摘Synthesis of functionalized mesoporous carbon by an easy-accessed method is of great importance towards its practical applications.Herein,an evaporation induced self-assembly/carbonization（EISAC）method was developed and applied to the synthesis of sulfonic acid group functionalized mesoporous carbon（SMC）.The final mesoporous carbon obtained by EISAC method possesses wormlike mesoporous structure,uniform pore size（3.6 nm）,large surface area of 735 m^2/g,graphitic pore walls and rich sulfonic acid group.Moreover,the resultant mesoporous carbon achieves a superior electrochemical capacitive performances（216 F/g） to phenolic resin derived mesoporous carbon（OMC,152 F/g） and commercial activated carbon（AC,119 F/g）.
基金the National Natural Science Foundation of China (91434108).
文摘Waste H_(2)SO_(4)from industrial isobutane alkylation,a hazardous thick liquid with a high concentration of acid soluble oil(ASO)impurities,poses challenges in the regeneration process.Herein,an innovative low-temperature carbonization process was proposed to convert waste H_(2)SO_(4)into the regenerated concentrated H_(2)SO_(4)and sulfonated activated carbon materials(SACMs)under mild reaction conditions.The optimal reaction temperature is identified at 423.15 K with the highest total organic carbon(TOC)removal of 90.57%.The high-purity regenerated H_(2)SO_(4)with a concentration of 95%as a catalyst for isobutane alkylation exhibits excellent catalytic performance with 94.54 research octane number(RON)of the alkylate.SACMs,characterized as a novel porous carbon material with plentiful hydroxyl,carboxylic acid,and sulfonic acid functional groups,demonstrate an efficient catalytic activity in the dimerization of lactic acid to produce lactide with a yield of 46.95%.Hopefully,the novel recovery process provides a promising application to optimize the regeneration process of waste H_(2)SO_(4)from industrial isobutane alkylation.
基金Supported by the Malek-Ashtar University of Technology
文摘The oxidation of organic compounds by sulfonated porous carbon and H2O2 was studied at room temperature. Alkyl and aryl sulfides were oxidized to the corresponding sulfoxides or sulfones in excellent yields. Secondary alcohols were also converted to the corresponding esters/lactones and aldehydes to methyl esters in good yields. Moreover,aliphatic tertiary amines and substituted pyridines were oxidized to N-oxides.
