Catalytic decomposition of perfluorocarbons Part II. Decomposition of CF4 over AlPO4-rare earth phosphate catalysts

The catalytic decomposition of CF4 over Ce/Al2O3 modified by a cerium sulfate precursor

“…This finding is in agreement with previous literature reports, in which impregnated sulfate ions were found to enhance the surface area of the supporting oxides [39][40][41]. Moreover, in the case of CA and CAS, the addition of cerium decreased the surface area, which may be accounted for as follows based on previous reports [18]. A very rigid network of alumina forms during calcination.…”

“…Among these methods, catalytic decomposition has been suggested as the most practical and economical method for reducing PFCs [14][15][16][17]. Takita et al reported that CF 4 , the most stable compound in PFCs, was decomposed by hydrolysis at 700 • C on selected metal phosphate catalysts, such as aluminum phosphate, and its mixtures with rare earth metal phosphates [18,19]. These phosphate catalysts including AlPO 4 have surprisingly long lifetimes and produce excellent results in practical applications [20].…”

Synthesis and characterization of nanoscaled BiPO4 and BiPO4:Tb

“…BiPO 4 has been claimed for several aspects of technical application, including catalysis [1,2], orthophosphate ion sensing by means of a quartz-crystal microbalance [3], as well as coprecipitation and separation of radioactive actinides [4,5]. Especially for catalysis BiPO 4 is a promising candidate and has been used, e.g., for a reduction of butyraldehyde to n-butanol [6].…”

Vapor Phase Beckmann Rearrangement of Cyclohexanone Oxime Over Rare Earth Pyrophosphates

“…The application of rare earth phosphates is also very attractive in heterogeneous catalysis [9][10][11][12][13][14][15]. Takita et al [9] found that some rare earth phosphates showed strong acid sites in the oxidative dehydrogenation of iso-butane, it suggested that it was possible to be a acid catalyst for rare earth phosphates.…”