Showing papers on "Selective catalytic reduction published in 1970"

Catalytic reduction of aldehydes to alcohols

Abstract: Aldehydes in a feed containing sulfur in the range of about 10 ppm to 1 weight percent in the form of thiophene or other heterocyclic ring compounds are hydrogenated in admixture with H2 to the corresponding alcohols with a catalyst comprising a reduced mixture of the oxides of Zn and Cu, without decomposing the ring sulfur compounds to a form of sulfur which deactivates the catalyst by using critical reaction conditions.

Production of hexafluoropropanol

Abstract: 1,1,1,3,3,3 - HEXAFLUOROPROPAN - 2 - O1 IS PREPARED BY THE VAPOR PHASE CATALYTIC REDUCTION OF HEXAFLUOROACETONE WITH HYDROGEN EMPLOYING A SUPPORTED PALLADIUM ON CARBON CATALYST.

A Novel Reduction in the Presence of Precipitated Metals. II. The Behavior of Precipitated Metals and Water in Catalytic Reduction

Abstract: The ppt-metal-catalyzed reduction, which is performed by refluxing the substrates with water in the presence of ppt-metals, was investigated in detail. The participation of water as a hydrogen donor was demonstrated by the fact that benzaldehyde was reduced to the corresponding deuterated alcohols when heated with D2O in the presence of ppt-Ni. The scope of the reduction was established by the reaction of cyclohexanone with ppt-metals and water. The most preferable H2O/cyclohexanone molar ratio was found to be about 15 : 1. The reaction was accelerated when a 0.25N aqueous solution of sodium chloride was used instead of water. It was found that the order of the abilities of various ppt-metals to decompose water is different from that of the abilities to catalyze the reduction of cyclohexanone. The values of the activation energies for the reduction catalyzed by ppt-Ni and ppt-Ni,Co were found to be 4.0 kcal/mol and 7.5 kcal/mol respectively. From these facts, it was concluded that the ppt-metal-catalyzed ...

Temperature-Programmed Reduction of Copper-Manganese Catalysts Derived from Biomass Activated Carbon

Abstract: This study investigates the potential of bimetal impregnated catalysts supported on activated carbon derived from biomass for Selective Catalytic Reduction (SCR) of Nitrogen Oxides (NOx) with ammonia (NH3). The bimetal catalysts, Copper-Manganese (Cu-Mn) was deposited onto palm kernel shell (PKS) and coconut shell (CS) via impregnation method and calcined at 250 °C. Hydrogen Temperature-programmed reduction analysis (H2-TPR) using 5% Hydrogen gas (H2) in Argon (Ar) have been carried out to study the effect of different variables such as metal impregnation and support properties on the reduced states of the catalysts. Besides, FTIR, TGA and XRD were also used to characterize the catalysts. It was observed that impregnation of bimetals enhanced the catalyst characteristics where include important results from FTIR, TGA, XRD and H2-TPR. Based on the results presented in H2-TPR analysis, it was observed that the reduction peak of bimetal catalysts deposited on palm kernel shell activated carbon shifted to high temperature, about 597 °C. This demonstrates the intensity of the precursor interaction exists and a higher dispersion of bimetals on the surface of the support. In addition, the higher dispersion of bimetals was shown in XRD analysis. Hence, palm kernel shell-derived catalysts could be new and promising catalysts in SCR system.

Catalytic reduction process

Abstract: Catalytic reduction of an ester of a nitrobenzoic acid and tertiary-amino alcohol to the corresponding amine by gradually adding the ester to an agitated suspension of noble metal catalyst in inert water immiscible solvent under hydrogen pressure. Improved yields and product purity are obtained in a more facile manner.