Effect of surface properties of TiO on the performance of Pt/TiO catalysts for furfural hydrogenation.

Hydrogenation of biomass-derived furfural is an important process in biofuel production. Herein, different Pt-supported TiO morphologies: nanorod (NR), nanoparticle (NP), and hollow microsphere (HMS) were prepared by the impregnation-chemical reduction method. The furfural conversion increased with an increase of Pt dispersion.

Effects of chlorinated Pd precursors and preparation methods on properties and activity of Pd/TiO catalysts.

We investigated the effects of Pd precursors and preparation methods on the physicochemical properties and performance of Pd/TiO catalysts in the photocatalytic degradation of methyl violet. To confirm the influence of the precursors, Pd/TiO catalysts were prepared chemical reduction (CR) using four different Pd precursors. Additionally, to determine the effects of preparation methods, Pd/TiO catalysts were fabricated using KPdCl precursor three different methods: CR, deposition-precipitation (DP), and impregnation.

Kinetic study of catalytic CO hydration by metal-substituted biomimetic carbonic anhydrase model complexes.

The rapid rise of the CO level in the atmosphere has spurred the development of CO capture methods such as the use of biomimetic complexes that mimic carbonic anhydrase. In this study, model complexes with tris(2-pyridylmethyl)amine (TPA) were synthesized using various transition metals (Zn, Cu and Ni) to control the intrinsic proton-donating ability. The pK of the water coordinated to the metal, which indicates its proton-donating ability, was determined by potentiometric pH titration and found to increase in the order [(TPA)Cu(OH)] < [(TPA)Ni(OH)] < [(TPA)Zn(OH)].

Kinetic Study of CO Hydration by Small-Molecule Catalysts with A Second Coordination Sphere that Mimic the Effect of the Thr-199 Residue of Carbonic Anhydrase.

Zinc complexes were synthesized as catalysts that mimic the ability of carbonic anhydrase (CA) for the CO hydration reaction (HO + CO → H + HCO). For these complexes, a tris(2-pyridylmethyl)amine (TPA) ligand mimicking only the active site, and a 6-((bis(pyridin-2-ylmethyl)amino)methyl)pyridin-2-ol (TPA-OH) ligand mimicking the hydrogen-bonding network of the secondary coordination sphere of CA were used. Potentiometric pH titration was used to determine the deprotonation ability of the Zn complexes, and their p values were found to be 8.

Growth mechanism of SnCHO nanowires prepared by the polyol process as SnO precursor nanowires.

Tin oxide (SnO) nanowires are produced by the calcination of tin glycolate (SnCHO) nanowires, which are synthesized with tin oxalate (SnCO) and ethylene glycol the so-called polyol process. In this study, the growth mechanism of SnCHO nanowires was investigated by monitoring the synthesis using scanning and transmission electron microscopy. The length and diameter of the nanowires were 9.

Surface Modification of SiO₂ for Highly Dispersed Pd/SiO₂ Catalyst.

Surface modification of SiO₂ supports was shown to significantly affect the properties of Pd/SiO₂ catalysts. The surface of SiO₂ can be modified by various pretreatment methods. In this study, the effect of different calcination temperatures on support surface was investigated.

Influence of Synthetic Parameters on the Particle Size and Distribution of Pd in Pd/Al₂O₃ Catalysts.

The increasing role of catalysis by noble metals coupled with their high price requires the development of cheaper and more effective catalysts, e.g., highly dispersed supported catalyst.

Synthesis of PbMoO₄ Nanoparticles Using a Facile Surfactant-Assisted Microwave Process and Their Photocatalytic Activity.

Lead molybdate (PbMoO₄) materials were successfully synthesized using a facile surfactant-assisted microwave process and characterized by XRD, Raman, PL, BET and DRS. We also investigated the photocatalytic activity of these materials for the decomposition of Rhodamine B under UV-light irradiation. The XRD and Raman results revealed the successful synthesis of 42–69 nm, well-crystallized PbMoO₄ crystals with a facile surfactant-assisted microwave process.

Carbon Nano Tube Supported Pd Catalyst: Effect of Support Textual Properties with Pre-Treatment Method of Pd Particle.

The aim of this work is to be compared the effect of supports textural properties with pre-treatment method on dispersion of Pd particle. The CNTs were functionalized by different concentration of acid in order to obtain materials with different chemical and physical properties. The characteristics of functionalized CNTs were investigated by FT-IR and Rama spectropy.

Improvements of Pd/C Catalyst Support Characteristics by Various Physical Dispersion Methods.

Pd/C catalysts were prepared by ion exchange in aqueous solution. Physical dispersion methods including sonication, high share mixer and stirrer were used for though high dispersion of carbon. The physical properties of the prepared Pd/C particles were investigated by BET, XRD, and FE-TEM.

Hydrogenolysis of Glycerol to Propylene Glycol on Nanosized Cu-Zn-Al Catalysts Prepared Using Microwave Process.

Cu-Zn-Al catalysts were prepared using microwave-assisted process and co-precipitation methods. The prepared catalysts were characterized by XRD, BET, XPS and TPD of ammonia and their catalytic activity for the hydrogenolysis of glycerol to propylene glycol was also examined. The XRD patterns of Cu/Zn/Al mixed catalysts show CuO and ZnO crystalline phase regardless of preparation method.

Catalytic Oxidation of Benzene Over LaCoO3 Perovskite-Type Oxides Prepared Using Microwave Process.

LaCoO3 perovskite type oxides were successfully prepared using microwave-assisted method, characterized by TG/DTA, XRD, XPS and H2-TPR and their catalytic activities for combustion of benzene were determined. Almost of catalyst showed perovskite crystalline phase and 13-84 nm particle size. LaCoO3 catalysts prepared by microwave-assisted method showed the highest activity and the conversion reached almost 100% at 360 degrees C.

Synthesis of Glycerol Carbonate by Transesterification of Glycerol with Urea Over Zn/Al Mixed Oxide.

Reactions of glycerol carbonate using glycerol and urea have been carried out previously using ZnSO4 and ZnO catalysts, and high yields have been reported using ZnSO4 as catalyst. However, this salt is soluble in glycerol, and recycling of catalyst is difficult after the reaction. In this study, we prepared a mixed metal oxide catalyst using Zn and Al, and this catalyst consisted of a mixture of ZnO and ZnAl2O4.

Liquid Hydrogenation of Maleic Anhydride with Pd/C Catalyst at Low Pressure and Temperature in Batch Reactor.

Succinic acid (SA) produced from hydrogenation of maleic anhydride (MAN) is used widely in manufacturing of pharmaceuticals, agrochemicals, surfactants and detergent, green solvent and biodegradable plastic. In this study, we performed that liquid hydrogenation of MAN to SA with 5 wt% Pd supported on activated carbon (Pd/C) at low pressure and temperature. The synthesis of SA was performed in aqueous solution while varying temperature, pressure, catalytic amount and agitation speed.

Synthesis of PbMoO4 nanoparticles by microwave-assisted hydrothermal process and their photocatalytic activity.

Lead molybdate (PbMoO4) was successfully synthesized using a microwave-assisted method and characterized by XRD, Raman spectroscopy, SEM, PL and DRS. We also investigated the photocatalytic activity of these materials for the decomposition of Rhodamin B under UV-light irradiation. The XRD and Raman results revealed the successful synthesis of 42-52 nm, well-crystallized PbMoO4 crystals with the microwave-assisted hydrothermal method.

Synthesis of Pb-substituted LaCoO3 nanoparticles by microwave process and their photocatalytic activity under visible light irradiation.

In this study, nanosized lead-substituted perovskite type oxides, La1_xPbxCoO3, were successfully synthesized using a microwave-assisted method and characterized by TG/DTA, XRD, XPS, TEM and DRS. We also investigated the photocatalytic activity of these oxides for the decomposition of methyl orange. From XRD results, metal replacement with the Pb ion in the crystal lattice does not change the high crystallinity of the perovskite structure.

Catalytic combustion of benzene over nanosized LaMnO3 perovskite oxides.

In this study, LaMnO3 perovskite type oxides were successfully prepared using the malic acid method. The oxides were characterized by TG/DTA, XRD, XPS, TEM and H2-TPR and their catalytic activities for the combustion of benzene were determined. Almost all of the catalysts showed perovskite crystalline phase and had a particle size of 15-60 nm.

Photocatalytic decomposition of methyl orange over nanosized perovskite-type oxides under visible light irradiation.

In this study, we have investigated the photocatalytic activity for the decomposition of methyl orange on the LaCoO3 perovskite-type oxides prepared using sol-gel method at different conditions. From the results of UV-Vis DRS, all the catalysts have the similar absorption spectrum up to visible region. The LaCoO3 catalyst prepared at 1.

Synthesis of TiO2 supported on SBA-15 using different method and their photocatalytic activity.

SBA-15 mesoporous materials were successfully prepared by the conventional hydrothermal method and TiO2 nanoparticles were supported on them using different loading methods. The synthesized materials were characterized and their activity as photocatalysts for the decomposition of methylene blue was evaluated. The loading of titanium dioxide on the framework of SBA-15 makes the pore diameter and pore volume decrease compared to that of SBA-15.

Catalytic combustion of benzene over copper oxide supported on SBA-15 using chelating method.

The catalytic combustion of benzene over copper oxide supported on SBA-15 was investigated. The catalysts were prepared by the using chelating method and characterized. It is clear that the loading of CuO on the silica matrix drastically decreases the surface area and pore volume of the catalysts, as would be expected for the incorporation of CuO.

Surfactant effects on SF6 hydrate formation.

Sulfur hexafluoride (SF(6)) has been widely used in a variety of industrial processes, but it is one of the most potent greenhouse gases. For this reason, it is necessary to separate or collect it from waste gas streams. One separation method is through hydrate crystal formation.

Formation of TiO2 nanoparticles in water-in-CO2 microemulsions.

Titanium dioxide nanoparticles can be produced by the controlled hydrolysis of titanium tetraisopropoxide in water-in-CO2 (w/c) microemulsions stabilized with the surfactants ammonium carboxylate perfluoropolyether (PFPE-NH4) and poly(dimethyl amino ethyl methacrylate-block-1H,1H,2H,2H-perfluorooctyl methacrylate) (PDMAEMA-b-PFOMA); the greater control of hydrolysis and particle growth with PDMAEMA-b-PFOMA is consistent with the differences in the stabilities and interactions for these two microemulsions.