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Jiao H.,Nanjing University of Technology | Chen X.,Nanjing University of Technology | Chen X.,Catalytic Hydrogenation Engineering Technology Research Center | Mei H.,Nanjing University of Technology | Mei H.,Catalytic Hydrogenation Engineering Technology Research Center
Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology | Year: 2015

Ru/Al2O3 catalysts were prepared by the impregnation method and catalytic hydrogenation of dibutyl phthalate to cyclohexane 1,2-dicarboxylic acid dibutyl ester was carried out in a high pressure reactor. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), H2 temperature-programmed reduction (H2-TPR), energy dispersive spectrometer (EDS) and transmission electron microscope (TEM). The results showed that Ru/Al2O3 catalyst with Ru loading of 3% exhibited excellent catalytic performance when reduced at 200℃. The dibutyl phthalate conversion and 1,2-dicarboxylic acid dibutyl ester selectivity reached 99.904% and 99.972%, respectively, under the conditions of 80℃, 2.0-2.5 MPa and stirring speed of 800 r/min. RuAl2O3catalyst showed the catalytic stability till reuse nine times. The deactivation of Ru/Al2O3catalysts was mainly due to the loss and aggregation of Ru and carbonization over catalysts surface. ©, 2015, Zhejiang University. All right reserved. Source

Su H.,Nanjing University of Technology | Su H.,Catalytic Hydrogenation Engineering Technology Research Center | Zhou W.,Beijing Research Institute of Chemical Defense | Mei H.,Nanjing University of Technology | And 3 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2014

The catalysts of Pd/CMK-3 are prepared by impregnation and reduction of Pd using mesoporous carbons CMK-3 as the support. The catalytic properties of Pd/CMK-3 are investigated for hydrogenation of sodium 2-nitrophenoxide to sodium 2-aminophenoxide in aqueous solution. The results show that the conversion of sodium 2-nitrophenoxide, the selectivity of sodium 2-aminophenoxide and the yield of 2-aminophenol are 100%, about 99.5% and 98.0%, respectively, with 5% Pd in CMK-3 under 338 K of temperature and 1.0 MPa of pressure. The catalysts are characterized by XRD, BET, SEM and TEM. The results suggest that Pd nanoparticles are highly dispersed and stabilized on the surface of CMK-3 due to the mesoporouse structures of CMK-3 and larger specific surface area, which endows Pd/CMK-3 with significantly higher activity for hydrogenation of sodium 2-nitrophenoxide. Source

Huang Y.-H.,Nanjing University of Technology | Ren G.-Q.,Nanjing University of Technology | Sun J.,Nanjing University of Technology | Wang C.-Q.,Nanjing University of Technology | And 4 more authors.
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | Year: 2016

The catalysts of CuZnAl-1, CuZnAl-2 and CuZnAl-3 were prepared by the co-precipitation method using NaOH, Na2CO3 and Na2CO3/NaOH, respectively, as the precipitant. They were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, H2-temperature programmed reduction (H2-TPR), TGA, and NH3-temperature programmed desorption (NH3-TPD); the effect of precipitant on the performance of CuZnAl catalysts in the gas phase selective hydrogenation of furfural to furfuryl alcohol was then investigated in a fixed bed reactor. The results illustrate that all three catalysts exhibit high furfural conversion, whereas the CuZnAl-3 catalyst gives the highest selectivity to furfuryl alcohol. The precipitant has a great impact on the phase structure, surface area, acidity and redox property of the resultant CuZnAl catalysts. The CuZnAl-3 catalyst prepared with Na2CO3/NaOH precipitant exhibits proper specific surface area, CuO crystalline phase, weak acid sites and easily reducible CuO on the catalyst surface, which are conducive to produce furfuryl alcohol for the hydrogenation of furfural. Under the optimizing reaction condition, viz., atmospheric pressure, 180 ℃, hydrogen to furfural molar ratio of 5 and furfural volume space velocity of 0.3 h-1, the conversion of furfural over the CuZnAl-3 catalyst reaches 99.4%, with a selectivity of 98.3% to furfuryl alcohol. © 2016, Science Press. All right reserved. Source

Liu S.,Nanjing University of Technology | Wang C.,Nanjing University of Technology | Chen X.,Nanjing University of Technology | Chen X.,Catalytic Hydrogenation Engineering Technology Research Center | And 2 more authors.
Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology | Year: 2016

Using nickel nitrate and cerium nitrate as impregnation liquids and γ-Al2O3 as supporter, a series of supported catalysts were prepared with different adding order of impregnation liquids. The effects of different impregnation sequence on the structure and properties of catalysts were characterized by specific surface area(BET) analysis, X-ray diffraction(XRD) and hydrogen temperature-programmed reduction (H2-TPR). The catalytic performance of various catalysts for the crude caprolactam purification was investigated in a fixed bed reactor. It was found that the NiO/CeO2/γ-Al2O3 catalyst prepared by fractional impregnation using Ce(NO3)3, Ni(NO3)2 sequentially impregnated supported on γ-Al2O3 had a better catalytic performance and stability. Under the reaction conditions of temperature 90℃, pressure 0.8 MPa, liquid hourly space velocity(LHSV) 0.8 h-1 and volume of H2 to liquid 75, the permanganate number(PM number) of the crude caprolactam purification over NiO/CeO2/γ-Al2O3 catalyst could be stable at 22 000 s. © 2016, Editorial Board of Journal of Chemical Reaction Engineering and Technology. All right reserved. Source

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