ChemInform Abstract: Supported Uranium Oxides as Oxidation Catalysts. Part l. Synthesis and Characterization of Uranium Oxides on Al₂O₃, SiO₂, TiO₂, and MgO Supports.

Abstract

A mechanism is proposed explaining the formation and stabilization of the title catalysts.

A New Class of Uranium Oxide Based Catalysts for the Oxidative Destruction of Benzene and Butane Volatile Organic Compounds

“…The process of supporting uranyl nitrate on silica destabilised the nitrate, as it decomposed at a temperature approximately 55°C lower. The same effect has previously been observed and has been shown to extend to other supports such as A1 2 0 3 , Ti0 2 and MgO [13]. Two other minor peaks were also evident, these were related to the loss of water and were located at 115°C and 162°C, which were at similar temperatures to those of the pure uranyl nitrate.…”

“…), and 404°C and 518°C (not shown), were due to the endothermic decomposition of the nitrate ion. The product from this decomposition is U0 3 which reduces endothermically to U0 29 at 590°C and ultimately to U 3 O g via an endothermic transition at 630°C [13]. In our experiments the furnace temperature was limited to 550°C by the use of aluminium sample pans and it was therefore not possible to observe these higher temperature transitions.…”