Liquid-phase catalytic hydrogenations with rhenium heptoxide derived catalysts
Rhenium is a comparatively newly discovered element and its catalytic properties have been poorly characterized. Therefore, this study was made to investigate more completely the catalytic properties of rhenium and its compounds. A complete review of the literature has been made on the reductions of carboxylic acids and the use of rhenium and its compounds as contact catalysts. The primary aspect of this investigation is the reduction of carboxylic acids with main interest in rhenium heptoxide in situ prepared catalysts. Reductions on various solvents with ex sity prepared catalysts also were studied. There have been about one hundred and fifty catalytic reductions on thirty-eight different substrates using rhenium prepared catalysts. The compounds to be reduced were either reagent grade or distilled to insure reasonable purity. The substrate along with rhenium heptoxide for the in situ reductions was placed in a rocking bomb using a glass liner and charged with hydrogen to 2000 psi. (occasionally 300 psi.). The usual procedure was to maintain low initial temperatures and if no appreciable reduction was observed, the pressure drop being the criterion, successively higher temperatures were used until reduction occurred, if at all. Thus minimal conditions were assured.
College and Department
Chemistry and Biochemistry
BYU ScholarsArchive Citation
Shaw, Graham C., "Liquid-phase catalytic hydrogenations with rhenium heptoxide derived catalysts" (1955). Theses and Dissertations. 8351.