K. V. Raghavan

Liquid phase acylation of amines with acetic acid over HY zeolite

Alkyl, aryl and heterocyclic amines are efficiently converted nto the corresponding amides with acetic acid over HY zeolite; the catalyst ncan be re-used with no loss of activity.

Fast and efficient synthesis of ZSM-5 under high pressure

Abstract Highly crystalline ZSM-5 catalysts were synthesized in 4–6 h of autoclavation time using various solvents under high pressures (∼40–60 atm ) and temperatures (230–250 °C)

Microwave irradiation: an effective method for the preparation of low dispersed Pd/Al2O3 catalysts used in the hydrodechlorination of CCl2F2 to CH2F2

Microwave irradiation is found to be a faster method for the preparation of low dispersed Pd/Al2O3 catalysts with higher activity and selectivity to CH2F2 in the hydrodechlorination of CCl2F2.

Correlation of activity and stability of CuO/ZnO/Al2O3 methanol steam reforming catalysts with Cu/Zn composition obtained by SEM–EDAX analysis ☆

Abstract A series of CuO/ZnO/Al 2 O 3 catalysts were prepared and characterized by TPR, surface area, metal area, XRD and SEM–EDAX analysis. These systems were evaluated in the development of a methanol steam reforming catalyst (MSR). A correlation of activity and stability of MSR catalysts with the Cu/Zn ratio derived by SEM–EDAX analysis is observed. The stable activity of these catalysts is also supported by the method of preparation, low temperature reducibility and the presence of reversibly oxidizable Cu species observed by TPR of fresh and used catalysts.

Selective nitration of aromatic compounds by solid acid catalysts

High activity and para-selectivity in the nitration nof aromatic compounds is achieved by a high density of acidic sites and nready formation of the para-isomer in the pores of zeolite beta nwith low Si/Al ratio as revealed by molecular modeling studies.

Acylation of Amines with Carboxylic Acids: The Atom Economic Protocol Catalysed by Fe(III)-Montmorillonite

An efficient and selective acylation of amines employing carboxylic acid as acylating agent was realised for the first time through tuning up of acidic sites of montmorillonite K10 achieved by incorporation of the right choice of exchangeable cations.

The first example of catalytic N-oxidation of tertiary amines by tungstate-exchanged Mg–Al layered double hydroxide in water: a green protocol

A green process, using a recyclable tungstate-exchanged Mg-Al layered double hydroxide (LDH-WO4(2-)) heterogenised catalyst and aqueous H2O2 oxidant in water, leads to N-oxidation of aliphatic tert-amines to amine N-oxides in quantitative yields, at a high rate at room temperature.

Selective Acetylation of 5-Numbered Aromatic Heterocycle Compounds Using Metal-Exchanged Clay Catalysts

Acetylation of 5-numbered aromatic heterocycle compounds under very mild conditions to 2-acetyl derivatives selectively in good yields using metal-exchanged clays as catalysts is described for the first time.

Liquid Phase Acylation of Alcohols with Acetic Acid Over Zeolites

Abstract The liquid phase acylation of primary and secondary alcohols were carried out with acetic acid in the presence of zeolites. LaY zeolite is found to be the best catalyst.

An efficient synthesis of heterocyclic N-oxides over molecular sieve catalysts

Heterocyclic N-oxides have been synthesized in very nhigh yields over redox molecular sieve catalyts in the presence of nH2O2.