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Xiao J.,Hunan Normal University | Huang H.,Hunan Normal University | Huang H.,Hunan Changling Petrochemical SandT Developing Co. | Xiang W.,Hunan Normal University | And 8 more authors.
RSC Advances | Year: 2016

Several C1-C4 alkylammonium hydrosulfates [R3NH][HSO4] have been conveniently prepared from the cheap raw materials sulfuric acid and alkylamines. Their acidities were measured by chemical titration and determined using UV-vis spectroscopy with a basic indicator 4-nitroaniline. The catalytic performance of these hydrosulfates for the condensation of phenol with formaldehyde to bisphenol F (BPF) was evaluated in detail on a batch reactor. The results indicated that the proposed catalysts are very active for such condensation due to its homogeneous catalysis characteristics in reaction conditions. Among the catalysts examined, [H3NCH2CH2NH3][HSO4]2 shows the best catalytic performance and it can achieve a complete conversion of formaldehyde, providing a higher than 90% selectivity for BPF under the optimal conditions. Furthermore, the catalyst can be recovered from the reaction mixture via an azeotropic distillation with cyclohexane to remove water and then filtration and used repeatedly six times almost without loss of activity, showing an excellent reusability. It is suggested that the present catalytic process combines the characteristics of a homogenized reaction and heterogenized recovery so might provide a highly-efficient, environmentally-friendly and low-cost route for synthesis of bisphenol F. © 2016 The Royal Society of Chemistry.


Liu J.,Hunan Normal University | Huang H.,Hunan Normal University | Huang H.,Hunan Changling Petrochemical S and T Developing Co. | Zhong S.,Hunan Normal University | And 3 more authors.
International Journal of Electrochemical Science | Year: 2016

Phenol and o-cresol are two organic contaminants largely produced by many industries and could potentially harmful people and environment. In this study, we proposed an electrochemical approach that could simultaneously determination of phenol and o-cresol. This method contained a commercial electrode surface modification process that deposition of ZnO nanosheets on the screen printed electrode (SPE). The fabricated sensor exhibited an outstanding electrocatalytic performances toward electro-oxidation of phenol and o-cresol. After optimization of the detection condition, the detection range and detection limit of the sensor were determined. Moreover, the proposed sensor also successfully applied for detecting phenol and o-cresol on the real wastewater. © 2016 The Authors. Published by ESG.


Wang Y.,Hunan Normal University | Wang Y.,Hunan Changling Petrochemical SandT Developing Co. | Wen X.,Hunan Normal University | Rong C.,Hunan Normal University | And 5 more authors.
Journal of Molecular Catalysis A: Chemical | Year: 2016

This paper first discloses that two heteroleptic 8-quinolinolato iron(III) complexes (Qa1Qb2FeIII, Qa2Qb1FeIII) could be synthesized conveniently via the coordination of FeCl2·6H2O with 2 equivalents of 5,7-dichloro-8-hydroxyquinoline (Qb) or 5-chloro-8-hydroxyquinoline (Qa) under N2 and then 1 equivalent of Qa or Qb under air. In comparison with the two homoleptic counterparts (Qa3FeIII and Qb3FeIII), the proposed heteroleptic Q3FeIII complexes possessed similar coordination features to the Qb3FeIII one but showed similar catalysis performances to the Qa3FeIII one in the oxygenation of cyclohexane to cyclohexanol and cyclohexanone by hydrogen peroxide (H2O2) in acetonitrile. More importantly, both heteroleptic Q3FeIII complexes showed a better accelerating effect on this reaction and provided a slightly higher conversion than the Qa3FeIII and especially Qb3FeIII ones. Furthermore, this predominance in catalytic activity was more strikingly apparent upon both-catalyzed oxygenations of benzene, toluene, ethylbenzene or thioanisole by H2O2. This should be due to a structurally distorted effect of the heteroleptic Q3FeIII complexes that is induced by the different in ligand environment, as supported by DFT B3LYP/6-311G (d) calculation. Based the present reaction and UV-vis spectral characterization results, a free radical mechanism for the present catalysis system was proposed. © 2015 Elsevier B.V. All rights reserved.


Shen N.,Shanxi Institute of Coal CAS Chemistry | Shen N.,Hunan Changling Petrochemical SandT Developing Co. | Xiang X.,Shanxi Institute of Coal CAS Chemistry | She X.,Hunan Changling Petrochemical SandT Developing Co. | And 2 more authors.
Applied Surface Science | Year: 2012

Cu-doped α-FeOOH nanowires with diameters of 30-40 nm and lengths up to 1 μm were synthesized by a convenient hydrothermal method under mild conditions. X-ray powder diffraction (XRD) and high-resolution TEM (HRTEM) studies indicated that nanowires were single-crystalline with an oriented growth along the [1 3 0] direction. The effects of Cu-dopant content on the morphologies and crystalline phases characterized by field emission scanning electron microscopy (FE-SEM), Mössbauer and Fourier transform infrared (FT-IR) spectroscopies were also investigated. Obtained results indicated that α-(Fe,Cu)OOH nanowires were formed up to x = 2.5, whereas α-(Fe,Cu) 2O 3 nanocubes alone were obtained at x = 10, where m(Fe:Cu) = 100:x. © 2012 Elsevier B.V.


Liao X.,Sinopec | Liao X.,Shanxi Institute of Coal CAS Chemistry | Liao X.,Hunan Changling Petrochemical SandT Developing Co. | Wang S.-G.,Shanxi Institute of Coal CAS Chemistry | And 4 more authors.
Fuel Processing Technology | Year: 2012

Three kinds of SO 3H-functionalized Brønsted-acidic ionic liquids with different acidities were applied to the etherification of glycerol with tert-butyl alcohol. High conversion and good selectivity were obtained under mild conditions. Among the ionic liquids investigated, those having a HSO 4 - anion afforded the highest glycerol conversion and those having a F 3CSO 3 - anion afforded the largest head product selectivity for glycerol etherification. The minimum-energy geometries and experimental results show that acidities and catalytic activities of ionic liquids are not only related to their structures but also to their immiscibility. © 2011 Elsevier B.V.


Zou J.,Hunan Changling Petrochemical SandT Developing Co. | Xiang M.,Hunan Changling Petrochemical SandT Developing Co. | Hou B.,Shanxi Institute of Coal CAS Chemistry | Wu D.,Shanxi Institute of Coal CAS Chemistry | Sun Y.,Shanxi Institute of Coal CAS Chemistry
Journal of Natural Gas Chemistry | Year: 2011

A novel synthesis route to obtain highly dispersed molybdenum carbides in porous silica is described. The synthesis was carried out by a single-step heat treatment of molybdenum-containing and methyl-modified silica (Mo-M-SiO 2) in argon atmosphere at 973 K. Mo-M-SiO 2 precursor was facilely obtained via a one-pot synthesis route, using (NH 4) 6Mo 7O 24·4H 2O (AHM) as molybdenum sources and polymethylhydrosiloxane (PMHS) as silica sources at the initial synthetic step. The optimal C/Mo molar ratio in reaction system for complete carburization of molybdenum species was 7. The carburization process of molybdenum species followed a nontopotactic route involving a MoO 2 intermediate phase, which was evidenced by XRD, N 2 adsorption-desorption and in situ XPS. Formation mechanism of Mo-M-SiO 2 precursor was also proposed by observation of the reaction between AHM and PMHS with TEM. Furthermore, by adding TEOS into silica sources and adjusting TEOS/PMHS mass ratio, crystal phase of molybdenum carbides transferred from β-Mo 2C to α-MoC 1-x, and SiO 2 structure changed from microporous to micro/mesoporous. Catalytic performances of samples were tested using CO hydrogenation as a probe reaction. The supported molybdenum carbides exhibited high selectivity for higher alcohol synthesis compared with bulk β-Mo 2C and αMoC 1-x. © 2011 CAS/DICP.


Xiang M.,Hunan Changling Petrochemical S and T Developing Co. | Wu D.,Guangdong Medical College | Zou J.,Hunan Changling Petrochemical S and T Developing Co. | Li D.,Shanxi Institute of Coal CAS Chemistry | And 2 more authors.
Journal of Natural Gas Chemistry | Year: 2011

Fe modified and un-modified K/M02C were prepared and investigated as catalysts for CO hydrogenation reaction. Compared with K/MO2C catalyst, the addition of Fe increased the production of alcohols, especially the C2+OH. Meanwhile, considerable amounts of C5+ hydrocarbons and C=2-=4 were formed, whereas methane selectivity greatly decreased. Also, the activity and selectivity of the catalyst were readily affected by the reaction pressure and temperature employed. According to the XPS results, Mo4+ might be responsible for the production of alcohols, whereas the low valence state of Mo species such as Mo° and/or Mo2+ might be account for the high activity and selectivity toward hydrocarbons. © 2011 CAS/DICP. All rights reserved.


Liao X.,Sinopec | Liao X.,Shanxi Institute of Coal CAS Chemistry | Liao X.,Hunan Changling Petrochemical S and T Developing Co. | Li K.,Shanxi Institute of Coal CAS Chemistry | And 6 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2012

SiO 2 supported ruthenium catalysts with and without modifiers were prepared, characterized and tested for glycerol hydrogenation. Addition of K, Cu and Mo affects the reducibility and acidity of the Ru/SiO 2 catalyst. Characterization data shows that Cu and Mo-modified Ru/SiO 2 have stronger acidity. On the contrary, K element on a passive effect on the acidity of Ru based catalyst had been observed. A comparison with the pure Ru/SiO 2 indicates the Cu-promoted specimen has better selective to the desired products, acetol, 1,2-propanediol and ethyl glycol, although the reactivity is slightly lower. © 2011 The Korean Society of Industrial and Engineering Chemistry.


Xiang M.,Hunan Changling Petrochemical SandTDeveloping Co. | Zou J.,Hunan Changling Petrochemical SandTDeveloping Co. | Li Q.,Hunan Changling Petrochemical SandTDeveloping Co. | She X.,Hunan Changling Petrochemical SandTDeveloping Co.
Journal of Natural Gas Chemistry | Year: 2010

Abstract Novel iron carbide and potassium-promoted iron carbide catalysts were prepared and investigated for CO hydrogenation. The iron carbide showed high activity for CO hydrogenation under high pressures; with the addition of potassium, activity and selectivity to C 5+ hydrocarbons were greatly enhanced, and the selectivity to methane was suppressed under high pressure. © 2010 CAS/DICP.


Xiang M.,Hunan Changling Petrochemical S and T Developing Co. | Xiang M.,Shanxi Institute of Coal CAS Chemistry | Li D.,Shanxi Institute of Coal CAS Chemistry | Zou J.,Hunan Changling Petrochemical S and T Developing Co. | And 4 more authors.
Journal of Natural Gas Chemistry | Year: 2010

The X-ray photoelectron spectroscopy (XPS) was used to investigate the surface characteristic of potassium-promoted or un-promoted both β-Mo 2C and α-MoC 1-x pretreated by syngas at different temperatures, and the promotional effect of potassium on the catalytic performance was also studied. XPS results revealed that the content of surface Mo and its valence distribution between β-Mo 2C and α-MoC 1-x were quite different. Promoted by potassium, the remarkable changes were observed for surface composition and valence of Mo distribution over β-Mo 2C. Potassium had strong electronic effect on β-Mo 2C, which led to a higher Mo 4+ content. On the contrary, potassium had little electronic effect on α-MoC 1-x, and K-Mo interaction was weak. Therefore, Mo 0 and Mo 2+ became the dominant species on the catalyst surface, and the Mo 4+ content showed almost no increase as the pretreatment temperature enhanced. In terms of catalytic performance of molybdenum carbides, the increase in Mo 0 most likely explained the increase in hydrocarbon selectivity, yet Mo 4+ might be responsible for the alcohols synthesis. © 2010 CAS/DICP.

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