Advanced Materials Research Vols. 287-290

Abstract: A series of V-Cr/SBA-15/Al₂O₃/FeCrAl metal monolithic catalysts with V content of 10wt% and Cr contents from 0 to 12.5wt% were prepared. The structure of the catalysts was characterized using XRD, XPS and TPR techniques. The catalytic activity for oxidative dehydrogenation (ODH) of propane with CO₂ was evaluated. The results indicate that the mesoporous structure of SBA-15 was retained after vanadium and chromium incorporation and the vanadium species were well dispersed. The V-Cr/SBA-15/Al₂O₃/FeCrAl catalyst with 10wt% V and 10 wt% Cr exhibited the best activity with a propane conversion of 49.9% and a propylene selectivity of 86.5% at 650 °C.

Abstract: A series of sodium bentonites and cetyl tri methyl ammonium bromide as raw materials were prepared to the modified organic composite montmorillonites. The performance characterization of the modified organic bentonite was observed by means of IR spectroscopy, X-ray diffraction, scanning electron microscopy. And the modified organic bentonite was applied into the pretreatment of landfill leachate, which was with the COD as high as 20000-37000 mg/L. The COD removal rate was invested as index. The optimum dosage and the best reaction conditions of bentonite have also been studied. The results indicated that the treatment effect of COD on the modified bentonite was better than the natural bentonite. Under the optimum conditions, the removal rate of COD reached 67.85% and the load of biological treatment was reduced on the next step.

Abstract: Resin as an important part of water-based plastic gravure ink which directly affect the performance of ink. In order to improve the performance of water-based plastic gravure ink，fixing other components and changing the type of resin to prepare ink. Viscosity of ink was measured. Proof the ink on PET film and the effect of resin on water-based plastic gravure ink was inspected through measuring adhesion, wear resistance and glossiness of the ink. The results indicate that water-based plastic gravure ink was prepared by acrylic resin S-2661D has low viscosity, high glossiness; water-based plastic gravure ink was prepared by acrylic resin 2661-91-3 has better ink adhesion, wear resistance performance.

Abstract: The sulfur tolerance over palladium supported on pure alumina and on alumina modified with barium of catalytic combustion of methane is investigated. Characterization of the catalysts is performed by, XRD and H₂-TPR techniques. Barium nitrate as the precursor to the formation of Ba(NO₂)₂ species can inhibit the SO₂ and SO₃ overflow from Al₂(SO₃)₃ and Al₂(SO₄)₃ sulfate to the adjacent PdO. Ba content on the performance of the catalyst resistance to sulfur poisoning has important implications. 0.7% Ba-1% Pd/Al₂O₃ catalyst resistance to sulfur poisoning property is close to that of high load capacity 5% Pd/Al₂O₃ catalyst.

Abstract: Nitrobenzene(NB) is a highly toxic and resistant to degradation organic pollutant which has been widely distributed in industrial wastewater. Much more attentions on the degradation of NB have been attracted to achieve the effectively removal of organic pollutant. Based on the hydrogen production from aqueous-phase reforming (APR) of oxygenated hydrocarbons reported by Dumesic, a novel method for the catalytic degradation of NB by APR reaction in wastewater has been proposed in this study. The effects of reaction conditions, such as temperature, the initial concentration of NB were investigated over Pd/C catalyst. The experimental results indicated that the degradation degree of NB could reach 100% (NB could be degraded completely) under optimal reaction conditions: 0.75 g 5% Pd/C, 2000 mg/L NB, T = 493 K, P = 3 MPa, t = 6 h under the atmosphere of Ar with a stirring speed of 950 r/min. The deactivation of Pd/C catalyst had not been observed after being reused for 12 recycles (the degradation degree of NB was more than 97%).

Abstract: A series of novel bis-indolylmethanes containing 1,2,3-triazolyl have been synthesized from the reaction of indoles with 4-formyl-1,2,3-triazole catalyzed by Brønsted acidic ionic liquid [PyNCH₂CO₂H][HSO₄] under solvent-free conditions. The satisfactory results were obtained with excellent yields and short reaction time in the experimental procedure.

Abstract: Dialdehyde konjac glucomannan (DAKGM) was synthesized by konjac glucomannan via sodium periodate (NaIO₄) as an oxidant and characterized by NMR and FTIR spectroscopy techniques. The results indicated that the oxidization of KGM catalyzed by NaIO₄ was highly selective for C2 and C3 of sugar units to form aldehyde group. Further, the solution behaviors of DAKGM were investigated by steady-state fluorescence. DAKGM exhibited two emission peaks at maximum wavelength 425 nm and 465 nm, respectively.

Abstract: Acid-activated by H₂SO₄ was applied to modify bentonite. Acid-activated bentonite supported Au catalyst was prepared by deposition-precipitation and compared with SiO₂ supported one. CTAB was used to modify the surface of acid-activated bentonite. Au-Ce/bentontie catalyst was prepared by adding Ce into catalyst as assistant. CO oxidation was used to evaluate the catalytic activity of samples. These samples were characterized by BET, XRD, ICP and CO-TPD. The activity results showed that Au/Bentonite was more active than Au/SiO₂. The BET results showed that the surface area and pore volume of acid-activated bentontie had a substantial improvement. Using the bentontie acid-activated by 30wt%H₂SO₄ as supporter，the Au-Ce catalyst has a better catalytic performance than Au catalyst.

Abstract: Ni-based catalysts supported on bentonite, Al₂O₃ and SiO₂ were prepared and characterized by the techniques of BET, XRD, TPR, H₂-TPD. Benzene hydrogenation was chosen as a probe reaction to evaluate the catalytic activity and the results shown that bentonite supporting Ni catalyst(Ni/Bentonite) was more active than catalysts supported on Al₂O₃ and SiO₂ in benzene hydrogenation. XRD and hydrogen chemisorption analyses indicated that the higher activity of Ni/Bentonite could be associated with the smaller particle sizes and better dispersion of Ni. The strong interaction between Ni and bentonite support might prevent the growth of Ni particles, as evidenced by TPR results. TPD analysis demonstrated that Ni/Bentonite adsorbed more hydrogen under reaction condition, thus resulting in its higher activity.

Abstract: A series of soy protein/kaolin nanocomposites have been successfully prepared via solution mixing and then extrusion. The structure and the properties of the nanocomposite plastics were characterized by wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), water uptake as well as mechanical testing. WAXD revealed that the nano-sized kaolin filler in soy protein matrix retained the original structure as the pristine kaolin. In view of the results of SEM, kaolin distributed in the protein matrix homogeneously and exhibited fine adhesion with soy protein. The incorporation of kaolin into glycerol-plasticized soy protein led to great improvements of mechanical and water resistant properties. The thermal stability was also enhanced by the incorporation of kaolin as revealed by TGA characterization.