Metal−Support Interactions in Co/Al2O3 Catalysts: A Comparative Study on Reactivity of Support

Isophthalonitrile (IPN) hydrogenation over K modified Ni–Co supported catalysts: catalyst characterization and performance evaluation

K modification suppressed both the original and the newly formed acid sites on the NiCo/Al₂O₃ catalyst, which were responsible for the condensation reactions in the IPN hydrogenation network.

Solvothermal synthesis of Co3O4/Al2O3 hollow core–shell microspheres for the catalytic oxidation of CO

Co₃O₄/Al₂O₃ hollow core–shell microspheres, which exhibit a large surface area, a mesoporous structure and an excellent CO catalytic performance, have been synthesized by a solvothermal process.

Control of carbon monoxide (CO) from automobile exhaust by a dealuminated zeolite supported regenerative MnCo2O4 catalyst

We synthesized MnCo(2)O(4) catalyst with very high porosity on the surface of dealuminated zeolite molecular sieves (DAZMS) for CO oxidation under actual automobile conditions. The MnCo(2)O(4) catalyst was selected on the basis of preliminary DFT study using the software ADF BAND. The MnCo(2)O(4) catalyst had comparatively higher CO adsorption energy and very low oxygen vacancy formation energy. The synthesized MnCo(2)O(4)/DAZMS catalyst was characterized by XRD, XRF, BET, SEM, and Confocal Microscopy. The Confocal microscopic analysis revealed that porosity of the dealuminated zeolite surface was significantly enhanced after the catalyst loading process. The completely precious metal free and DAZMS-supported catalyst exhibited excellent CO oxidation ability with renewed activity for seven months under actual automobile conditions with reference to normal and cold start conditions. The synthesized MnCo(2)O(4)/DAZMS not only exhibited surprisingly high catalytic activity for CO oxidation at a temperature resembling a cold start period but was also sufficiently stable/active under actual automobile conditions and ambient conditions containing large amounts of CO,H(2)O,CO(2), and NO(x) at 155-715 °C. These significant results revealed the flexible use of the present catalyst system for a wide variety of automobiles from a small gasoline-fuelled vehicle to a large diesel-fuelled vehicle that may produce high CO-content exhaust.

Catalytic Incineration of Ethylbenzene over Monolith-Supported Metal Oxide Catalyst

Catalytic incineration of ethylbenzene has been investigated over metal oxide catalysts coated on monolith supports. Co3O4, Cr2O3 and a mixed form of these were prepared and tested. Studies were carried out at 1 atm pressure in a fixed-bed reactor with 865% excess air. Prior experiments were conducted without catalyst from which it was found that 46% of ethylbenzene was converted at the maximum temperature tested, i.e. 400°C. All the catalysts produced higher conversion rates than that of the homogeneous experiments; nevertheless, with none of these was complete combustion of ethylbenzene achieved. The maximum conversions obtained were 76% over Cr2O3 and 74% over Co3O4 at 400°C. The adsorption of hydrocarbons and other products on the catalysts was investigated. Both Cr2O3 and Co3O4 catalysts were analysed by infrared spectroscopy, both before and after the catalyst testing experiments.

Preparation and Characteraction of New Magnetic Co–Al HTLc/Fe3O4Solid Base

Novel magnetic hydrotalcite-like compounds (HTLcs) were synthesized through introducing magnetic substrates (Fe₃O₄) into the Co–Al HTLcs materials by hydrothermal method. The magnetic Co–Al HTLcs with different Fe₃O₄contents were characterized in detail by XRD, FT-IR, SEM, TEM, DSC, and VSM techniques. It has been found that the magnetic substrates were incorporated with HTLcs successfully, although the addition of Fe₃O₄might hinder the growth rate of the crystal nucleus. The morphology of the samples showed the relatively uniform hexagonal platelet-like sheets. The grain boundaries were well defined with narrow size distribution. Moreover, the Co–Al HTLcs doped with magnetic substrates presented the paramagnetic property.

Synthesis of CoOOH nanorods and application as coating materials of nickel hydroxide for high temperature Ni-MH cells

Studies on nanoscale materials have received great interest in both fundamental and applied aspects in recent years. In this letter, we report the synthesis of CoOOH nanorods and their possible applications as coating materials on nickel hydroxide for high-temperature nickel-metal hydride (Ni-MH) cells. The morphology and structure of CoOOH nanorods and coated nickel hydroxide particles are investigated by transmission electron microscopy, X-ray diffraction, and scanning electron microscopy, respectively. The electrochemical properties in the cylindrical AA size Ni-MH cells are evaluated. Our results show that the Ni-MH cells, where the positive electrodes are composed of such nanometer sized CoOOH coatings, have a higher capacity available and good performance at elevated temperatures of >50 degrees C.