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Zhang Q.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Liu H.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Li X.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Xu R.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | And 3 more authors.
Polymer Engineering and Science | Year: 2016

To improve the high-temperature performance of proton exchange membranes, the polybenzimidazole (PBI)/α-zirconium phosphate (α-Zr(HPO4)2·nH2O, α-ZrP) proton exchange composite membranes were prepared in this study. PBI polymer containing a large amount of ether units has been synthesized from 3, 3'- diaminobenzidine (DAB) and 4, 4'-oxybis (benzoic acid) by a direct polycondensation in polyphosphoric acid. The polymer exhibited a good solubility in most polar solvents. Inorganic proton conductor α-ZrP nanoparticles have been obtained using a synthesis route involving separate nucleation and aging steps (SNAS). The effects of α-ZrP doping content on the composite membrane performance were investigated. It was found that the introduction of ZrP improved the thermal stability of the composite membranes. The PBI/ZrP composite membranes exhibited excellent mechanical strength. The composite membrane with 10 wt% ZrP showed the highest proton conductivity of 0.192 S cm-1 at 160°C under anhydrous condition. © 2016 Society of Plastics Engineers.


Qin Y.,Changzhou University | Chao L.,Changzhou University | He J.J.,Changzhou University | Liu Y.,Changzhou University | And 4 more authors.
Journal of Power Sources | Year: 2016

Ultrafine Pt nanoparticles (PtNPs) with the diameter of ∼2.5 nm were successfully confined within Fe,N-codoped robust 3D graphene (Fe-N/R3DG) via facile polyol-assisted reduction strategy. Owing to the synergistic effect between the active catalyst (PtNPs) and the support (Fe-N/R3DG), the as-obtained composite exhibited better cyclic stability and long-term durability as well as less methanol toxicity, moreover, 8 times higher specific activity than the commercial Pt/C for oxygen reduction reaction (ORR) in alkaline medium. The results bring new insight into the design of excellent ORR catalyst. © 2016 Elsevier B.V.


He Y.-C.,Changzhou University | He Y.-C.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | He Y.-C.,East China University of Science and Technology | Ma C.-L.,Changzhou University | And 4 more authors.
Applied Microbiology and Biotechnology | Year: 2013

Enantioselective oxidation of racemic phenyl-1,2-ethanediol into (R)-(-)-mandelic acid by a newly isolated Brevibacterium lutescens CCZU12-1 was demonstrated. It was found that optically active (R)-(-)-mandelic acid (e.e.p > 99.9 %) is produced leaving the other enantiomer (S)-(+)-phenyl-1,2- ethanediol intact. Using fed-batch method, a total of 172.9 mM (R)-(-)-mandelic acid accumulated in the reaction mixture after the seventh feed. Moreover, oxidation of phenyl-1,2-ethanediol using calcium alginate-entrapped resting cells was carried out in the aqueous system, and efficient biocatalyst recycling was achieved as a result of cell immobilization in calcium alginate, with a product-to-biocatalyst ratio of 27.94 g (R)-(-)-mandelic acid g-1 dry cell weight cell after 16 cycles of repeated use. © 2013 Springer-Verlag Berlin Heidelberg.


Wang Q.-S.,Changzhou University | Wang Q.-S.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Li G.,Changzhou University | Li G.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | And 2 more authors.
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | Year: 2014

Na-B-ZSM-5 molecular sieves were synthesized by hydrothermal method with silica white as silicon source, boric acid as boron source, sodium hydroxide as alkali, and tetrapropylammonium bromide (TPABr) and 1, 6-hexamethylenediamine (HMDA) as the hybrid template. The synthesized Na-B-ZSM-5 samples were characterized by XRD, SEM, FT-IR, UV-vis, 11B MAS NMR and NH3-TPD. Their catalytic performance in methanol dehydrogenation to formaldehyde was evaluated in a fixed-bed reactor under atmospheric pressure and the effects of the catalyst preparation parameters like Si/B molar ratio, basicity, crystallization temperature and crystallization time as well as the reaction conditions like temperature and space velocity (WHSV) on the methanol dehydrogenation behavior were investigated. The results indicated that boron atoms are introduced into the framework of Na-B-ZSM-5 molecular sieves, present as the Bronsted acid sites from four-coordinated boron atoms and Lewis acid sites from tricoordinated boron atoms. Na-B-ZSM-5 molecular sieves contain more weak acid sites and less middle-strong acid sites. The optimized preparation parameters of the Na-B-ZSM-5 molecular sieve are as follows: 7.5 of Si/B molar ratio, 0.14 of Na2O/SiO2 molar ratio, 170°C of crystallization temperature and 48 h of crystallization time. The conversion of methanol and the selectivity to formaldehyde reach 62.97% and 68.86%, respectively, under the reaction conditions of 550°C and a WHSV of 1.85 h-1 over the optimized Na-B-ZSM-5 molecular sieve.


Zhang Z.-H.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Wang J.-L.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Gao N.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | He M.-Y.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
Acta Crystallographica Section C: Structural Chemistry | Year: 2014

The novel title organic salt, 4C5H7N2 + C24H8O8 4- 8H 2O, was obtained from the reaction of perylene-3,4,9,10- tetracarboxylic acid (H4ptca) with 4-aminopyridine (4-ap). The asymmetric unit contains half a perylene-3,4,9,10-tetracarboxylate (ptca 4-) anion with twofold symmetry, two 4-aminopyridinium (4-Hap +) cations and four water molecules. Strong N-H⋯O hydrogen bonds connect each ptca4- anion with four 4-Hap+ cations to form a one-dimensional linear chain along the [010] direction, decorated by additional 4-Hap+ cations attached by weak N-H⋯O hydrogen bonds to the ptca4- anions. Intermolecular O-H⋯O interactions of water molecules with ptca4- and 4-Hap+ ions complete the three-dimensional hydrogen-bonding network. From the viewpoint of topology, each ptca4- anion acts as a 16-connected node by hydrogen bonding to six 4-Hap+ cations and ten water molecules to yield a highly connected hydrogen-bonding framework. π-π interactions between 4-Hap + cations, and between 4-Hap+ cations and ptca 4- anions, further stabilize the three-dimensional hydrogen-bonding network. © 2014 International Union of Crystallography.


Jiang H.-J.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Cui A.-J.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Yin F.-H.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | Wei M.-J.,Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2015

Several metal oxides and their salts are used as catalysts to study the depolymerization of polyglyolic acid (PGA) oligomers. It is found that the temperature of depolymerization reaction decreases obviously under the catalysis of Zn(acac)2. At the same time, the coking is reduced in the process of preparing glycolide with the improved yield of glycolide. Zn(acac)2 is also applied in the solution depolymerization of PGA, and thermal degradation of the azeotropic solvent is prevented at high temperature. It proves that Zn(acac)2 can enhance the efficiency of depolymerization and the higher catalytic activity is thought to correlate to the coordination-insertion mechanism. The experimental results show that PGA oligomer is depolymerized at lower temperature (200℃) under Zn(acac)2 catalyst with a mass fraction of 0.4%. The yield of glycolide reaches 95%. The activation energy value in process of oligomer depolymerization is lower in the presence of Zn(acac)2 than the other catalysts, enhancing the efficiency of depolymerization. ©, 2015, China National Chemical Information Center. All right reserved.


PubMed | Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
Type: Journal Article | Journal: Acta crystallographica. Section C, Structural chemistry | Year: 2014

The novel title organic salt, 4C5H7N2(+)C24H8O8(4-)8H2O, was obtained from the reaction of perylene-3,4,9,10-tetracarboxylic acid (H4ptca) with 4-aminopyridine (4-ap). The asymmetric unit contains half a perylene-3,4,9,10-tetracarboxylate (ptca(4-)) anion with twofold symmetry, two 4-aminopyridinium (4-Hap(+)) cations and four water molecules. Strong N-HO hydrogen bonds connect each ptca(4-) anion with four 4-Hap(+) cations to form a one-dimensional linear chain along the [010] direction, decorated by additional 4-Hap(+) cations attached by weak N-HO hydrogen bonds to the ptca(4-) anions. Intermolecular O-HO interactions of water molecules with ptca(4-) and 4-Hap(+) ions complete the three-dimensional hydrogen-bonding network. From the viewpoint of topology, each ptca(4-) anion acts as a 16-connected node by hydrogen bonding to six 4-Hap(+) cations and ten water molecules to yield a highly connected hydrogen-bonding framework. - interactions between 4-Hap(+) cations, and between 4-Hap(+) cations and ptca(4-) anions, further stabilize the three-dimensional hydrogen-bonding network.

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