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Benzenesulfonic acid-grafted UIO-66 with improved hydrophobicity as a stable Brønsted acid catalyst

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 10,   Pages 1389-1398 doi: 10.1007/s11705-022-2285-5

Abstract: benzenesulfonic acid on the surface of the pristine UIO-66 to introduce the hydrophobicity, as well as the Brønstedacidity, then assessed using catalytic hydrolysis of cyclohexyl acetate (to cyclohexanol) in water.

Keywords： metal−organic frameworks (MOFs)     UIO-66     hydrolysis of cyclohexyl acetate     hydrophobicity     Brønsted acidity    

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Effects of support acidity on the reaction mechanisms of selective catalytic reduction of NO by CH

Shicheng XU, Junhua LI, Dong YANG, Jiming HAO

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 2,   Pages 186-193 doi: 10.1007/s11783-009-0016-5

Abstract: Catalysts derived from different supports would lead to different reaction pathways, and the acidityHigher ratios of Br?nsted acid sites to Lewis acid sites would lead to stronger oxidation of methane and then could facilitateStrong Br?nsted acid sites would not necessarily lead to better catalytic performance, however, since the active

Keywords： selective catalytic reduction (SCR)     nitric oxide (NO)     methane     support acidity     Br?nsted acid sites     NOy species    

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Study on extraction of thiophene from model gasoline with br?nsted acidic ionic liquids

Xiaomeng WANG, Mingjuan HAN, Hui WAN, Cao YANG, Guofeng GUAN

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 1,   Pages 107-112 doi: 10.1007/s11705-010-0539-0

Abstract: Br?nsted acidic ionic liquids (ILs), -methylimidazole hydrogen sulfate ([HMIm]HSO ) and -methylpyrrolidone

Keywords： br?nsted ionic liquids     model gasoline     thiophene     extraction     density functional theory    

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Biodiesel production by the transesterification of cottonseed oil by solid acid catalysts

CHEN He, PENG Baoxiang, WANG Dezheng, WANG Jinfu

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1,   Pages 11-15 doi: 10.1007/s11705-007-0003-y

Abstract: solid acid catalysts showed more better adaptability than solid base catalysts when the oil has high acidityIR spectral analysis of absorbed pyridine on the samples showed that there were Lewis and BrØnsted acid

Keywords： BrØnsted     reaction     presence     cottonseed     biodiesel    

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Ionic liquid mediated esterification of alcohol with acetic acid

Beilei ZHOU, Yanxiong FANG, Hao GU, Saidan ZHANG, Baohua HUANG, Kun ZHANG

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 211-214 doi: 10.1007/s11705-009-0054-3

Abstract: Highly efficient esterification of alcohols with acetic acid by using a Br?nsted acidic ionic liquid, i.e., 1-methyl-2-pyrrolidonium hydrogen sulfate ([Hnmp]HSO ), as catalyst

Keywords： ionic liquid     Br?nsted acid     esterification     catalyst    

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Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites

Frontiers in Energy   Pages 763-774 doi: 10.1007/s11708-023-0897-1

Abstract: Herein a series of microporous and mesoporous zeolites were used to study the influence of porosity and acidityThe effect of porosity and acidity on catalytic performance of zeolites was evaluated, which clearly

Keywords： plastics conversion     polyethylene     zeolites     acidity     porosity    

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Precise regulation of acid pretreatment for red mud SCR catalyst: Targeting on optimizing the acidity

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 7, doi: 10.1007/s11783-021-1447-x

Abstract:

• The optimum SCR activity was realized by tuning the acid pretreatment.

Keywords： Air pollution control     Nitrogen oxides     Selective catalytic reduction     Red mud     Solid waste utilization    

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Enhanced CuCl dispersion by regulating acidity of MCM-41 for catalytic oxycarbonylation of ethanol to

Pengzhen CHEN, Shouying HUANG, Jijie ZHANG, Shengping WANG, Xinbin MA

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 224-231 doi: 10.1007/s11705-014-1447-5

Abstract: Considering its intrinsic weak acidity, MCM-41 was modified by a simple impregnation method to incorporate

Keywords： MCM-41     acidity     oxidative carbonylation     diethyl carbonate    

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G-quadruplex formation of oligonucleotides containing ALS and FTD related GGGGCC repeat

Jasna Brčić,Janez Plavec

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 2,   Pages 222-237 doi: 10.1007/s11705-016-1556-4

Abstract: scrutiny and optimization of nuclear magnetic resonance (NMR) spectroscopic properties with dG to 8Br-dGSingle dG to 8Br-dG substitution at position 21 and fine tuning of folding conditions facilitate folding

Keywords： G-quadruplex     GGGGCC     NMR     ALS/FTD     polymorphism    

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Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 82-92 doi: 10.1007/s11705-022-2181-z

Abstract: The amination of alkyl alcohols is one of the most promising paths in synthesis of aliphatic amines. Herein, cerium doped nickel-based catalysts were synthesized and tested in a gas-phase amination of n-hexanol to n-hexylamine. It was found that the activity of the Ni/γ-Al2O3 catalyst is significantly improved by doping an appropriate amount of cerium. The presence of cerium effectively inhibits the agglomeration of nickel particle, resulting in better Ni dispersion. As Ni particle size plays critical role on the catalytic activity, higher turnover frequency of n-hexanol amination was achieved. Cerium doping also improves the reduction ability of nickel and enhances the interactions between Ni and the catalyst support. More weak acid sites were also found in those cerium doped catalysts, which promote another key step—ammonia dissociative adsorption in this reaction system. The overall synergy of Ni nanoparticles and acid sites of this Ni–Ce/γ-Al2O3 catalyst boosts its superior catalytic performance in the amination of n-hexanol.

Keywords： amination     alcohol     cerium     nickel     acidity     interaction    

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Vanadium(IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 56-67 doi: 10.1007/s11705-022-2185-8

Abstract: Separation of vanadium from black shale leaching solution at low pH is very meaningful, which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium loss. In this study, coordination mechanism of vanadium in acid leaching solution at low pH was investigated with the intervention of chloride ions. Under the conditions of pH 0.8, di-(2-ethylhexyl)phosphoric acid concentration of 20%, phase ratio of 1:2, and extraction time of 8 min, the vanadium extraction could reach 80.00%. The Fourier transform infrared and electrospray ionization results reveal that, despite the fact that the chloride ion in the leachate could significantly promote vanadium extraction, the chloride ion does not enter the organic phase, indicating an intriguing phenomenon. Among Cl−–V, SO42−–V, and H2O–V, the V–Cl bond is longer and the potential difference between coordinate ions and vanadium is smaller. Therefore, VO2+ gets easily desorbed with chloride ions and enter the organic phase. At the same time, the hydrogen ions of di-(2-ethylhexyl)phosphoric acid also enter the water phase more easily, which reduces the pH required for the extraction reaction.

Keywords： vanadium     black shale     solvent extraction     high acidity extraction    

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Modification of acidity of Mo-Fe/HZSM-5 zeolite via argon plasma treatment

ZHU Xinli, YU Kailu, CHENG Dangguo, XIA Qing, LIU Changjun, ZHANG Yueping

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1,   Pages 55-58 doi: 10.1007/s11705-008-0005-4

Abstract: The NH-TPD characterization was conducted to confirm that the acidity of Mo-Fe/HZSM-5 zeolite could be

Keywords： phenanthrene     Mo-Fe/HZSM-5     conversion     glow discharge     polycyclic    

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Synthesis of boron modified CoMo/Al

Hui Shang, Chong Guo, Pengfei Ye, Wenhui Zhang

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 5,   Pages 1088-1098 doi: 10.1007/s11705-020-1969-y

Abstract: active component and the support by enlarging the surface area and pore diameter, and reducing the acidity

Keywords： CoMo catalyst     boron modification     surface acidity     microwave heating     selective hydrodesulfurization    

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A pyrazine based metal-organic framework for selective removal of copper from strongly acidic solutions

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1633-0

Abstract:

● pz-UiO-66 was synthesized facilely by a solvothermal method.

Keywords： Pyrazine     Metal-organic frameworks     Copper removal     Strong acidity     High selectivity    

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Organic nitrogen in PM

Qian ZHANG,Fengkui DUAN,Kebin HE,Yongliang MA,Haiyan LI,Takashi KIMOTO,Aihua ZHENG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 6,   Pages 1004-1014 doi: 10.1007/s11783-015-0799-5

Abstract: ON sources are more of secondary formation, possibly strengthened by combination influence of RH and acidity

Keywords： organic nitrogen     N:C ratio     secondary     day and night variation     relative humidity (RH)     acidity    

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Title Author Date Type Operation

Benzenesulfonic acid-grafted UIO-66 with improved hydrophobicity as a stable Brønsted acid catalyst

Journal Article

Effects of support acidity on the reaction mechanisms of selective catalytic reduction of NO by CH

Shicheng XU, Junhua LI, Dong YANG, Jiming HAO

Journal Article

Study on extraction of thiophene from model gasoline with br?nsted acidic ionic liquids

Xiaomeng WANG, Mingjuan HAN, Hui WAN, Cao YANG, Guofeng GUAN

Journal Article

Biodiesel production by the transesterification of cottonseed oil by solid acid catalysts

CHEN He, PENG Baoxiang, WANG Dezheng, WANG Jinfu

Journal Article

Ionic liquid mediated esterification of alcohol with acetic acid

Beilei ZHOU, Yanxiong FANG, Hao GU, Saidan ZHANG, Baohua HUANG, Kun ZHANG

Journal Article

Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites

Journal Article

Precise regulation of acid pretreatment for red mud SCR catalyst: Targeting on optimizing the acidity

Journal Article

Enhanced CuCl dispersion by regulating acidity of MCM-41 for catalytic oxycarbonylation of ethanol to

Pengzhen CHEN, Shouying HUANG, Jijie ZHANG, Shengping WANG, Xinbin MA

Journal Article

G-quadruplex formation of oligonucleotides containing ALS and FTD related GGGGCC repeat

Jasna Brčić,Janez Plavec

Journal Article

Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Journal Article

Vanadium(IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with

Journal Article

Modification of acidity of Mo-Fe/HZSM-5 zeolite via argon plasma treatment

ZHU Xinli, YU Kailu, CHENG Dangguo, XIA Qing, LIU Changjun, ZHANG Yueping

Journal Article

Synthesis of boron modified CoMo/Al

Hui Shang, Chong Guo, Pengfei Ye, Wenhui Zhang

Journal Article

A pyrazine based metal-organic framework for selective removal of copper from strongly acidic solutions

Journal Article

Organic nitrogen in PM

Qian ZHANG,Fengkui DUAN,Kebin HE,Yongliang MA,Haiyan LI,Takashi KIMOTO,Aihua ZHENG

Journal Article