The Ce doping Cu/ZSM-5 catalysts were prepared using an improved incipient-wetness-impregnation method, and their catalytic performances were tested for the selective catalytic reduction (SCR) of NO with NH3. The aim of the present study was to understand and elucidate the deNOx activity as well as deactivation behaviors of the Ce doping Cu/ZSM-5 catalyst. The catalysts were characterized by a series of analytical techniques, including XRD, NH3-TPD, TEM, XPS, and TGA. The results indicated that the well dispersion of CuO nanoparticles was the primary cause for the high deNOx performance of the Ce doping Cu/ZSM-5 catalyst. The addition of Ce greatly improved the hydrothermal stability of the Cu/ZSM-5 catalyst, due to it could stabilize the dispersion of CuO and suppress the bulk-type CuO crystallites formation during hydrothermal treatment. The inhibition of deposition of CuSO4 by doping of Ce made the Cu/ZSM-5 catalyst a good resistance to SO2. In conclusion, the catalytic performance, hydrothermal stability and SO2 resistance of the Cu/ZSM-5 catalyst were greatly improved by the addition of Ce, which made the Ce doping Cu/ZSM-5 as a promising catalyst for the NH3-SCR technology.

V2O5/WO3-TiO2 catalysts were prepared by conventional impregnation (VWTi-con) and ultrasound-assisted impregnation methods (VWTi-HUST). Their catalytic performance was tested for the selective catalytic reduction (SCR) of NO with NH3. The effects of the preparation methods on the catalyst properties were studied. The catalysts were characterized by X-ray diffraction, scanning electron microscopy, Raman and X-ray photoelectron spectroscopy. Both structural investigation and NH3-SCR activity showed that the preparation method had a strong effect on the thermal behavior of the V2O5/WO3-TiO2 catalysts. After a hydrothermal treatment, a significant loss of NO reduction activity was observed for the VWTi-con catalyst, which suffered severe sintering and even formed a rutile VxTi1-xO2 solid solution, while the VWTi-HUST catalyst had the same good hydrothermal stability as a commercial catalyst, indicating that the VWTi-HUST catalyst can be used in a commercial diesel after-treatment system. The ultrasound-assisted impregnation method produced a stronger interaction between the vanadium species and WTi support, which stabilized the vanadium species in the reduced state. (C) 2014, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Hydroxyethyl cellulose-acrylamide polymer was synthesized by redox,the viscosified property,heat resistance,salt resistance of the graft polymer solution were measured by rotary viscometer.The results showed that the viscosified property of HEC-AM was better than that of pure polyacrylamide(PAM) in the rage of the testing concentrations(w);when w(HEC-AM) was higher than 0.8 %,the viscosity of HEC-AM increased rapidly.At the same temperature,the viscosity of HEC-AM solution was higher than that of the PAM solution,when the temperature rose to 80 ℃,viscosity retention rate of HEC-AM was 54.4 %,and that of PAM was 28 %,after aging 5 days under 80 ℃,the viscosity retention rate of HEC-AM was 53.3 %,and that of PAM was 22.7 %,the heat resistance and thermal stability of HEC-AM were better than those of PAM.As the concentrations of salt solutions increased,the viscosities of HEC-AM decreased,but the salt resistance of HEC-AM was always better than that of the PAM,and at higher temperatures,the salt resistance of HEC-AM was better than that of PAM.

The graft copolymerization of acrylamide(AM) and hydroxyethyl cellulose(HEC) initiated by ammonium potassium and hydrogen sulfite sodium in aqueous medium was synthesized under nitrogen atmosphere.The effect of various factors such as reaction time,reaction temperature and intiator amount were investigated in terms of intrinsic viscosity.The graft copolymer was characterized and analyzed by FT-IR,and the thermal stability was analyzed by TGA.

This paper discussed the mechanic properties and compatibility of polyphenylene sulfide/maleic anhydride grafted styrene-ethylene-butadiene-styrene (PPS/SEBS-g-MAH) system. Thermal behavior of the blends was characterized by means of DSC. The results showed the glass transition temperatures of PPS and SEBS-g-MAH in the blends tended to approach each other, which indicated the two materials were partially compatible in the blends. Mechanic property investigation results showed that the notched impact strength of the system increase with the increase of M-SEBS content, which attended 7.5kJ/m^2 when the ratio was 70/30. Besides these, in the PPS/Kevlar Fiber/ SEBS-g-MAH blends, SEBS-g-MAH could enhance interfacial adherence between the matrix and fiber, and made the mechanical properties of the blends well increased.

The effect of different screw assemblies on the extruding process and mechanical properties of glass fiber reinforced styrene-acrylonitrile copolymer(AS) was studied,and a suitable type of screw assembly for reinforced AS was designed.The results showed that the proper screw assembly could improve the extruding process and upgrade the mechanical properties of the reinforced AS.By improving melting and shear effect of the screw assemblies,the tensile strength and flexural strength of glass fiber reinforced styrene-acrylonitrile copolymer were improved obviously,from 105MPa and 115MPa to 116MPa and 125MPa respectively.Moreover,it ensured the production of equipment.The quality of product met the requirements of home appliances manufacturing enterprises at home and abroad.