Fluorinated chromia active sites

Fluorinated chromia used to catalyze the isomerization reaction of CHF2CHF2 to CF3CH2F, also exhibited evidence for the importance of chromium in higher oxidation states. FTIR spectroscopic measurements of CO adsorption confirmed the occurrence of Cr4+ and Cr5+ on the surface of chromia catalysts before being used [52]. During the activation, Cr4+ and Cr5+ sites were reduced and enhanced activity of the catalyst was observed. The reaction pathway proposed for isomerization involves the formation of hydrogen fluoride due to the degradation reaction of the fluoroalkane. [Pg.377]

Fundamental Properties of Fluorinated Chromia 198 Attempts to Describe Active Sites on Fluorinated Chromia 199 Synthesis of 1,1,1,2-Tetrafluoroethane Over Fluorinated Chromia 200 Oxidation States of Chromium 200 Doped Chromia Catalysts 201... [Pg.193]

The following discussion examines the role of the two materials under consideration. Section 2 reviews fundamental issues connected with the role of fluorinated chromia as an active catalyst for a variety of reactions Section 3 considers physicochemical attributes of the acid site distribution associated with rj-alumina catalysts as applied to a single reaction, namely the synthesis of methyl chloride via the hydrochlorination of methanol. [Pg.196]

Attempts to Describe Active Sites on Fluorinated Chromia... [Pg.199]

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