Kinetic study of oxidation of cyclohexanol using bimetallic iron–copper macrocyclic complex catalyst
15 Dec 2008-Catalysis Communications (Elsevier)-Vol. 10, Iss: 3, pp 285-290
TL;DR: In this paper, a macrocyclic FeCu complex covalently bonded to modified alumina support was prepared for oxidation of cyclohexanol using molecular oxygen and an irreversible first order reaction mechanism was proposed and optimal rate constants were determined.
About: This article is published in Catalysis Communications.The article was published on 2008-12-15. It has received 11 citations till now. The article focuses on the topics: Cyclohexanol & Cyclohexanone.
TL;DR: Cobalt oxide catalysts supported on mesoporous silica SBA-15 were compared with analogous catalysts prepared by the more conventional methods of impregnation and adsorption as mentioned in this paper.
Abstract: Cobalt oxide catalysts supported on mesoporous silica SBA-15 were prepared by the “two-solvent” method and compared with analogous catalysts prepared by the more conventional methods of impregnation and adsorption. Cobalt nitrate was used as the precursor. The catalysts were characterized by N 2 adsorption–desorption, XRD, FTIR, XPS, TPR, ICP-MS, TEM and DR UV–vis. Their activity for the oxidation of cyclohexanol was determined by GC and GC–MS. The effect of metal loading on the morphology and catalytic activity of the catalysts was investigated. The catalyst with the lowest cobalt content exhibited the highest catalytic activity for cyclohexanol oxidation due to the better accessibility of the reactants to the catalytic sites.
TL;DR: In this article, a minireview of selective hydrogenation of phenol and related derivatives to cyclohexanone and analogues is presented, highlighting the research advances in this field.
TL;DR: In this paper, an easily manufactured catalyst, alkali-metal-promoted Pd/TiO2, achieves 99% phenol conversion and 99% cyclohexanone selectivity at mild conditions of 80 °C and an extremely low H2 pressure of 0.06 MPa in water.
TL;DR: In this paper, a hydroxyapatite-bound palladium catalyst (Pd-HAP) was used to demonstrate its excellent performance on phenol hydrogenation to cyclohexanone.
Abstract: The production of pure cyclohexanone under mild conditions over catalysts with high reactivity, selectivity, compatibility, stability, and low cost is still a great challenge. Here we report a hydroxyapatite-bound palladium catalyst (Pd-HAP) to demonstrate its excellent performance on phenol hydrogenation to cyclohexanone. Based on catalyst characterization, the Pd nanoclusters (approximate to 0.9nm) are highly dispersed and bound to phosphate in HAP. Only basic active sites on HAP surface are detected. At 25 degrees C and ambient H-2 pressure in water, phenol can be 100% converted into cyclohexanone with 100% selectivity. This system shows a universal applicability to temperature, pH, solvent, low H-2 purity, and pressure. The catalyst reveals high stability to be recycled without deactivation or morphology change; and Pd nano-clusters barely aggregate even at 400 degrees C. During the reaction, HAP adsorbs phenol, and Pd nanoclusters activate and spillover H-2. The mechanism is also investigated, proposed, and verified.
TL;DR: Ionic liquid 1-octyl-3-methylimidazolium chloride was found to effectively intensify cyclo hexanol oxidation and resulted in 100% conversion of cyclohexanol with 100% selectivity tocyclohexanone using hydrogen peroxide as an oxidant and WO(3) as a catalyst.
TL;DR: A review of the current state of knowledge of phase separation and phase equilibria in porous materials can be found in this article, where the focus is on fundamental studies of simple fluids and well-characterized materials.
Abstract: We review the current state of knowledge of phase separation and phase equilibria in porous materials. Our emphasis is on fundamental studies of simple fluids (composed of small, neutral molecules) and well-characterized materials. While theoretical and molecular simulation studies are stressed, we also survey experimental investigations that are fundamental in nature. Following a brief survey of the most useful theoretical and simulation methods, we describe the nature of gas‐liquid (capillary condensation), layering, liquid‐liquid and freezing/melting transitions. In each case studies for simple pore geometries, and also more complex ones where available, are discussed. While a reasonably good understanding is available for phase equilibria of pure adsorbates in simple pore geometries, there is a need to extend the models to more complex pore geometries that include effects of chemical and geometrical heterogeneity and connectivity. In addition, with the exception of liquid‐liquid equilibria, little work has been done so far on phase separation for mixtures in porous media.
TL;DR: In this paper, a review of the most popular IR spectroscopy applications for catalytic applications is presented, starting from the very general basis of the spectroscopic method applied and focusing on the adsorption of chelating compounds on surfaces of mineral oxides.
TL;DR: In this paper, the catalytic data showed that these catalysts are very active in catalytic oxidation of olefins and alcohols and showed that adsorption of molecular oxygen on Cu 2 (OH)PO 4 and Cu 4 O(PO 4 ) 2 catalysts shows typical signals assigned to hydroxyl radicals, which may be responsible for the high catalytic activities of the catalysts.