Preparation and Characterization of a Solid Acid Catalyst from Commercial Niobia Hydrate

Abstract

A commercially available niobia hydrate, which is an industrial intermediate in the production of pure niobia, was prepared, characterized, and tested as a solid acid catalyst. The gas phase esterification of acetic acid with ethanol was used as a simple model reaction for the determination of the acidity and the catalytic activity. The kinetic evaluation of the experiments includes an estimation of mass transport limitation as well as a mechanistic study.

Synthesis of High‐Purity Methylal via Extractive Catalytic Distillation

“…In recent years, due to the advantages of corrosion elimination as well as ease of recycle and regeneration [4][5][6], a series of solid acid catalysts such as cation-exchange resins, zeolite, supported heteropolyacids as well as sulfonated fluoroalkylene resin derivatives were developed to replace sulfuric acid for methylal synthesis [7][8][9][10]. In recent years, due to the advantages of corrosion elimination as well as ease of recycle and regeneration [4][5][6], a series of solid acid catalysts such as cation-exchange resins, zeolite, supported heteropolyacids as well as sulfonated fluoroalkylene resin derivatives were developed to replace sulfuric acid for methylal synthesis [7][8][9][10].…”