Sichuan Institute of High Education

Zigong, China

Sichuan Institute of High Education

Zigong, China
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Wei J.,University of Sichuan | Wei J.,Sichuan Institute of High Education | Zou L.,University of Sichuan | Zou L.,Sichuan Institute of High Education | And 2 more authors.
New Journal of Chemistry | Year: 2016

The sulfonic acid functionalized mesoporous silica catalysts with tunable surface wettability are fabricated by integrating a phenyl group and perfluorooctyl chain together into the pore walls of mesoporous silica materials via a prehydrolysis induced by co-condensation strategy followed by sulfonation with chlorosulfonic acid. As the content of perfluorooctyl groups increases, the water contact angle of the solid acid catalyst ranges from 15° to 95°, demonstrating that the surface properties transforms from hydrophilic to hydrophobic. These solid acid catalysts showed excellent catalytic performance in the condensation reaction of benzaldehyde with ethylene alcohol. It was found that the surface wettability influences the catalytic activity significantly and catalytic results demonstrated that a hydrophobic surface is beneficial for activity due to enhanced mass transport. It can be noted that the stability of the solid acid catalyst with hydrophobic properties could also be greatly enhanced from that of the hydrophilic solid catalyst. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016.

Zhao B.,University of Sichuan | Zhao B.,Sichuan Institute of High Education | Ma D.,University of Sichuan | Ma D.,Sichuan Institute of High Education
Advanced Materials Research | Year: 2012

The sphere-like nano-Cu 2O was prepared by chemical precipitation and reduction method, the different size of sample was obtained by adjusting reaction temperature and concentration of NaOH solution. Cu 2O was characterized by XRD and SEM, respectively. The results indicate that the homogeneity of Cu 2O particles is related to the reaction temperature while the crystal type to the concentration of NaOH solution. The effects of the different particle size on the photocatalytic properties in the treatment of chromium(VI)-containing water was performed, the results show that there exists an important relationship between them, that is the excellent properties can be obtained with smaller size of Cu 2O. © (2012) Trans Tech Publications, Switzerland.

Jiang W.,University of Sichuan | Jiang W.,Sichuan Institute of High Education | He X.,University of Sichuan | He X.,Sichuan Institute of High Education | And 7 more authors.
Chinese Journal of Chemistry | Year: 2011

This paper describes the catalytic performance of two manganese(III) complexes with mono-Schiff base ligands as artificial hydrolases towards the hydrolysis of p-nitrophenyl picolinate (PNPP). Observations reveal that the one complex ( MnL 2 2Cl ) containing morpholine pendants exhibits 1.2-1.7 fold kinetic advantage over the other one ( MnL 2 1Cl ) containing benzoaza-15-crown-5 group. Especially, optimum molecule structures using a Gaussian 03 software confirm that MnL 2 2Cl indeed possesses a relatively open linked site for the approaching of PNPP, resulting in higher efficiency due to a convenient association between substrate (PNPP) and MnL 2 2Cl . In addition, the steric hindrance of two pendants, i.e., benzoaza-15-crown-5 and morpholine, may be a main influencing factor for tuning catalytic activities of the synthesized Mn(III) catalysts. Both Mn(III) catalysts used here were found to have fine tolerance to the operated temperature and pH. Related kinetic and thermodynamic analyses were also given to demonstrate their structure-activity relationships (SAR) of both catalysts used. © 2011 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Zhao B.,University of Sichuan | Zhao B.,Sichuan Institute of High Education | Ma D.,University of Sichuan | Ma D.,Sichuan Institute of High Education
Advanced Materials Research | Year: 2011

Nano-Cu2O has wide application prospects in the fields of chemical industry and engineering due to its special optical, electrical and catalytic properties. The nano-particles with different morphological structure and particle size have different physical-chemical properties and different application fields. Therefore, this article reviewed the preparation methods of Nano-Cu2O at high/room temperature and the key point of its morphology control. © 2011 Trans Tech Publications.

Jiang W.,University of Sichuan | Jiang W.,Sichuan Institute of High Education | Xu B.,University of Sichuan | Xu B.,Sichuan Institute of High Education | And 5 more authors.
Applied Catalysis A: General | Year: 2016

A type of Pd/α-Fe2O3 catalyst was synthesized by a convenient UV light-induced reduction in the presence of Fe3+ ions. The synthesized Pd/α-Fe2O3 particles were characterized by X-ray diffraction (XRD), low-resolution transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectrum (XPS), atomic force microscope (AFM), scan electron microscopy with energy dispersion spectra (SEM-EDS), FT-IR and BET. Related characterizations confirm that UV light-induced reduction is a feasible, simply and environment-friendly method for the preparation of supported catalysts containing active metal. Furthermore, hydrogenation of o-chloronitrobenzene (o-CNB) to o-chloroaniline (o-CAN) by the selected Pd(0.5%)/α-Fe2O3 was investigated systematically. The α-Fe2O3-supported Pd catalyst was found to exhibit good catalytic activity and selectivity for the o-CNB reduction under mild conditions. The hydrogenation of o-CNB over the resulting Pd-based catalyst gave a 100% o-CNB conversion and 91.4% selectivity of o-CAN under the reaction conditions of 50 °C, 2 h, 1 MPa hydrogen pressure, no-CNB/nPd = 6000:1. Moreover, the resulting Pd-based catalyst remained higher hydrogenation reactivity after three runs even if a sharply decrease in activity was observed at the fourth run. The obtained results reveal the as-prepared Pd/α-Fe2O3 is an efficient catalyst for the hydrogenation of o-CNB even at a high level of substrate concentration. © 2016 Elsevier B.V. All rights reserved.

Fan G.,China West Normal University | Ren Y.,China West Normal University | Jiang W.,Sichuan Institute of High Education | Wang C.,Binghamton University State University of New York | And 2 more authors.
Catalysis Communications | Year: 2014

Amine-functionalized magnetite nanoparticles synthesized from a facile one-pot template-free method were applied as carriers for depositing Rh nanoparticles using RhCl3 as the precursor. The as-prepared nanocomposites were applied for the hydrodechlorination of 4-chlorophenol at room temperature and atmospheric pressure. A complete conversion of 4-CP was obtained with the generation of phenol, cyclohexanone as the main products. The excellent catalytic activity, stability and recyclability of the catalyst were probably contributed to the functionalities of amine groups for stabilizing the Rh nanoparticles and the magnetic effect of Fe3O4 support during consecutive recycling of the catalyst. © 2014 Elsevier B.V. All rights reserved.

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