Advanced Materials Research Vols. 834-836

Abstract: The catalytic oxidation of NOx from waste gas was investigated using advanced oxidation process based on sulfate radicals. The manganese oxide immobilized on graphene oxide (GO) can activate peroxymonosulfate (PMS) for the oxidation of NOx in water. The Mn₃O₄/GO catalyst system exhibited efficient activity for NOx oxidation when the Mn₃O₄/GO catalyst loaded an optimum Mn₃O₄. In addition, 52.28% oxidation could be achieved within 60 min with 0.25 mM catalyst, and 2 mM PMS. Therefore, the results may have significant technical implication for utilizing Mn²⁺/PMS to oxidize NOx for offgas treatment.

Abstract: SiO₂ antireflective films were prepared by sol-gel method with TEOS as the raw materials and acid or ammonia as catalyst. The effects of different catalysts on the transmittance and the stability of film were investigated. The prepared base catalyzed SiO₂ film has better antireflective effects than that of film acid catalyzed film, but the corrosion-resistance of SiO₂ film catalyzed by acid was better than that of film catalyzed by base, the average transmittance in the range of 400-900nm of acid-catalyzed film after 50h salt spray test was about 93.8%, which was higher than that of base-catalyzed film.

Abstract: Amorphous nickel hydroxides added anion (PO₄^3-) has been prepared by chemical precipitation method combined with rapid quench technique. The morphology of the prepared samples were characterized by scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS). The effect of anion on the electrochemical performance of the prepared nickel hydroxides were investigated by charge/discharge tests and cyclic voltammetry (CV). The results demonstrated that amorphous nickel hydroxide added PO₄^3- has better electrochemical performance, such as higher discharge potential, better reaction reversibility, higher the charging efficiency, and better cyclic stability, than that of the pure amorphous nickel hydroxide.

Abstract: Twelve monoazo disperse dyes were synthesized and then characterized by melting point (m.p.) measurement, elemental analysis and ¹H-NMR. The photostability of monoazo disperse dyes in solvents with different polarities was evaluated thereafter the dyes in each solvent were irradiated with visible light for 8 hours. The percentage of photostability of the dye decreased from the initial value in the range of 5-10%. The photostability was affected by the substituted group of the dyes regardless of the solvent used. Different R₁ group on the diazo component increased the photostability in order of H˃CN˃Cl. The photostability of the dye was also higher when R₂ group on the coupling component was a methyl group.

Abstract: A series of Mo-ZSM-5 zeolites have been synthesized by in site hydrothermal method and their catalytic performance for methanol conversion to propylene was tested in a fixed bed reaction at WHSV=4 h^-1, pressure of 1 atm, and MeOH/H₂O (mol) ratio of 1. The effect of Mo and Al content on the structure and acidity of Mo-ZSM-5 zeolites were characterized by nitrogen adsorption and NH₃-TPD. The results showed that Mo incorporation gradually decreased the BET surface area and weaken the strong acidity on the surface of the zeolites. At 470 °C, the maximum selectivity of propylene and the P/E (Propylene to Ethane) ratio were achieved 45.04 % and 7.30, which were higher than those over Mo free HZSM-5 by 4.12% and 3.47, respectively. Mo-ZSM-5 zeolites are promising catalysts for methanol conversion to propylene with a high P/E.

Abstract: In this paper, application of dividing wall column (DWC) to high purity cyclohexene oxide distillation was studied. Simulation using Aspen plus software was done to compare the traditional two tower process with new process based on DWC. The results show that, with the same feed parameters, the DWC processes can achieve identical separation effect as the tow tower process with an energy saving of 14.5%, and capital investment and space saving can also be gained. In addition, only a reboiler is need in DWC process, residence time of these thermosensitive substances such as cyclohexene oxide inside high temperature region can be reduced, so can to avoid the frequently occurring heat decomposition to a great extent. So the simulation results indicate that a DWC would be a beneficial alternative to conventional two tower configuration for high purity cyclohexene oxide distillation.

Abstract: A novel Ni metal complex H₂₆Mo₆N₂NiO₃₀ has been synthesized from hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. H26Mo6N2NiO30, Monoclinic, P2(1)/c. a = 11.3487(14) Å, b = 11.0823(13) Å, c = 11.9350(16) Å. alpha=gamma= 90°. beta= 108.542(2)°. V= 1423.1(3) Å3. It is also striking that the structure of title compound exhibits extensive hydrogen-bonding interactions among water molecules, ammonium cation, and oxygen atoms in the heteropolyanion.

Abstract: A novel Eu metal complex C₁₄H₁₉EuN₂O₁₄ has been synthesized from hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Eu atom is nine-coordinated by two N atom and seven O atoms. The crystal packing is stabilized by O-H...O hydrogen bonding interactions

Abstract: In the title compound, C₂₁H₉Ba₂N3O₁₂Sr, is prepared from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The compound crystallize in Monoclinic, system with space group and cell parameters, C2/c, a=22.668 Å, b=10.937 Å, c=9.05 Å, α=γ=90°, β=90.582°, V=2243.6 Å3. The crystal packing is stabilized by O-H...O and O-H...N hydrogen bonding interaction.

Abstract: In general, two tower process was used to purify crude chlorobenzene, of which the primary tower is to remove benzene and water, and the rectification tower to remove higher boiling components. In this paper, simulation and optimization of such two tower process were done using the rigorous distillation column simulator RadFrac in Aspen Plus. The steady-state simulation results of temperature, flowrate and compositions can agree well with that of real plant. In addition, optimized design and operating parameters, such as minimum reflux ratio, minimum number of trays, feed stage, etc, were obtained and would be very important for industrial applications.