Cu/Pd Bimetallic Supported on Mesoporous TiO2 for Suzuki Coupling Reaction

Generally bimetallic catalysts are more superior to monometallic catalysts and provide a better platform for the development of novel catalysts with enhanced activity, selectivity, and stability. In the current work we have prepared Cu/Pd bimetallic supported on mesoporous TiO2 by hydrothermal method. The prepared system was characterized by various physico-chemical techniques such as XRD, TG-DTG, SEM, EDAX, BJH isotherm, and XPS. Thermal stability and complete electronic structure were identified from TG and XPS measurements respectively. The bimetallic system was found to be very active in Suzuki cross-coupling reaction using different substrates. The products were separated and purified by column chromatography and the resultant products were characterized thoroughly by 1H NMR, and FT-IR analysis.

‘‘catalysis by nano sulfated titania modified by transition metals"

in the present study, we have prepared and evaluated the physical and chemical properties and catalytic activities of transition metal loaded sulfated titania via the sol-gel route. Sol-gel method is widely used for preparing porous materials having controlled properties and leads to the formation of oxide particles in nano range, which are spherical or interconnected to each other. Characterization using various physico-chemical techniques and a detailed study of acidic properties are also carried out. Some reactions of industrial importance such as Friedel-Crafts reaction, fen-butylation of phenol,Beckmann rearrangement of cyclohexanone oxime, nitration of phenol and photochemical degradation of methylene blue have been selected for catalytic activity study in the present venture. The work is organized into eight chaptersCochin University of Science and TechnologyDepartment of Applied Chemistry Cochin University of Science and Technolog

Alkylation of phenol with <i>tert-</i>butyl<i> </i>alcohol catalysed by some sulphated titania systems

1131-1138Titania sulphated titania and transition metal loaded (9%) sulphated titania have been prepared by sol gel method and characterized by XRD, FTIR, BET surface area, EDX and UV-vis DRS. Surface acidity of these catalysts is determined by temperature programmed desorption of ammonia. Alkylation of phenol with ten-butanol in the vapour phase over the prepared systems has been studied at 1 atm and 160-220oC. The reaction provides high selectivity of alkylation at the para position . The product selectivity has been correlated with the surface acidity of the systems

Sulfated titania mediated regioselective nitration of phenol in solid state

Titania, sulfated titania and chromium loaded sulfated titania were prepared by sol–gel method and characterized using different technique. Phenol is nitrated regioselectively by nitric acid using chromium loaded sulfated titania catalysts. A remarkable ortho selectivity is observed in solid state nitration to yield exclusively ortho-nitrophenol. Compared to the conventional process, phenol nitration over solid acid catalyst is a clean and environment friendly process. Catalytic activity well correlates with the Brönsted acid sites of these catalysts.Cochin University of Science and Technolog

Surface properties and catalytic activity for cyclohexanol decomposition of ceria loaded rutile and their sulphated analogues

473-480Ceria loaded rutile samples with different percentage of ceria and their sulphated analogues have been synthesized and characterized by various physico-chemical techniques such as XRD, FT-IR, BET-SA, TGA, EDX and UV-vis DRS. The surface acidity of the sample is determined by temperature programmed desorption of ammonia. Vapour phase decomposition of cyclohexanol performed over all the systems reveals that sulphation of the ceria loaded systems leads to selective catalysts for cyclohexene formation, along with a little enhancement in the catalytic activity. The present study also establishes the resistance of the catalysts towards deactivation