Papers by Keyword: Catalytic Property

Abstract: Nickel based alloy microtube was prepared by utilizing spider silk as template via electroless deposition. The spider silk fiber was choosed as template which can be removed easily by heat-treatment and dissolving with sodium hydroxide solution. The nickel based alloy microtube was characterized by TG-DSC, XRD, SEM and EDX. SEM show that the microtube is about 600nm in outer diameter, 400 nm in inner diameter and more than 20 μm in the length. The catalytic activity of different structure Ni-P products was studied in liquid-phase hydrogenation of nitrobenzene reaction. The results show that the catalytic property of amorphous nickel based alloy is better than crystalline nickel based alloy and Raney Ni.

Abstract: The property of CuO/ZnO/Al₂O₃ catalysts for methanol synthesis was investigated by means of XRD, H₂-TPR and DTG. The results show that the thermal activity of the self-made CuO/ZnO/Al₂O₃ catalyst is better than the commercial catalyst C302 and displayed stable property after 180h application. The catalyst calcinated revealed strong interaction between CuO and ZnO, and the dispersion of CuO crystal particular was uniform. There was a small amount of carbon deposition on the surface of CuO/ZnO/Al₂O₃ catalyst after synthesis reaction. For synthesis of methanol with self-made catalyst in fixed reactor from the analog components of reformed bluecoke furnace gas, the space time yield and selectivity of coarse methanol respectively reached 1.5451 g·g^-1·h^-1 and 99.6143% under the conditions of temperature of 240°C, pressure of 5.5MPa and space velocity of 12000h^-1.

Abstract: The ceramic layers containing Cu(II) were prepared by Micro-arc Oxidation on aluminum under alkaline electrolyte (NaSiO₃; Cu(Ac)₂; Na₂WO₄; Na₃PO₄; Na₂B₄O₇). Using x ray photoelectron spectroscopy, scanning electron microscopy, ultraviolet spectrophotometry and chemical oxygen demand analyzer on the film composition, structure and catalytic properties were characterized. The results showed that when the Cu2p peaks emerged in XPS pattern, the corresponding substances were CuO and Al₂CuO₄, it told us that there had the catalyst in the ceramic coating composition containing CuO. As can be seen from the SEM image analysis, with the pulse width increased, the ceramic layer surface volcanic hole size also increased and the area density trended to loose. Meanwhile, phenol oxidation test results demonstrated that with the pulse width parameter increasing, the catalytic effect of the micro-arc oxidation ceramic layers trended to increasing. However, at higher pulse width such as 750 microseconds, the conversion rate of phenol was weakened strongly.

Abstract: Magnetic mesoporous Mn-Fe oxide catalyst with high surface area was prepared by calcining the corresponding oxalate precursor. The calcined sample was characterized by XRD, FTIR, N₂ adsorption, TEM, and SEM. The catalytic property of the porous Mn-Fe oxide catalyst was evaluated by catalytic decolorization of methyl orange (MO). XRD, SEM, and TEM analysis and N₂ adsorption–desorption isotherm revealed mesoporous Mn-Fe oxide strucutre with high-surface area and uniform pore-size distribution. The results of catalytic performance measurements showed that the Mn-Fe binary oxide was an effective catalyst. The as-prepared catalyst could be recycled as a magnetically separatable catalyst to treat dye-containing wastewater.

Abstract: The Self-Propagating High-Temperature Synthesis (SHS) method has been used to produce a new class of active catalyst materials based on metals, metal oxides and spinels for various applications. The method is characterized by very fast processing times (of the order of minutes), relatively low preheating temperatures and very high reaction temperatures produced as a result of carefully designed exothermic reactions. A large range of materials have been produced and characterized by a variety of physico-chemical and mechanical tests. This review devoted to Catalytic properties of SHS products. A number of catalytically active materials all over the world have been identified which offer promise for applications ranging from oxidation of CO and hydrocarbons to reduction of NOx, methane dehydrogenation and other.

Abstract: The structural analysis of thin cerium dioxide films doped with Cu, produced by laser ablation for applications in catalytic and gas sensors, was the general aim of the study. The thin films deposited on a (100) silicon substrate were nanocrystalline structure with a well-developed texture. The morphology, as well as the preferred films orientation, is changed with the volume fraction of Cu. The observed changes affect the catalytic properties of the materials obtained which was confirmed by the catalytic tests undertaken with CH4.