Abstract
Mayenite (Ca12Al14O33) was synthesized by a novel route based on the use of polymethyl methacrylate (PMMA) as a soft templating agent. The material was tested for the total oxidation of trichloroethylene in the gas phase and the catalytic performance was analysed when using different initial amounts of PMMA in the catalyst synthesis. The results were compared with those obtained with a mayenite synthetized by a classical hydrothermal method. The highest activity in terms of TCE conversion was achieved in the presence of mayenite prepared using 10% w/w of PMMA; its activity was also higher than that of the hydrothermal mayenite. The surface area and the number of superoxide anions (O2−) seem to be the main properties determining the catalytic activity of the material.
Highlights
Mayenite (Ca12 Al14 O33, C12A7) is a mesoporous calcium aluminate that recently has attracted many researchers from different fields of chemistry, with applications ranging from passive sampling to steam reforming [1,2,3,4,5,6]
The results revealed the disappearance of the CaCO3 phase; we can speculate that calcium carbonate impurities could be responsible for the initial enhancement of mayenite 10 stability due to the reaction between CaCO3 and in-situ produced HCl (TCE oxidation product), with the formation of a well dispersed CaCl2 phase [18,25,27]
Mayenite catalyst was prepared by a novel synthetic route based on the use of polymethyl methacrylate (PMMA) as a soft templating agent and tested for the total oxidation of TCE
Summary
Mayenite (Ca12 Al14 O33 , C12A7) is a mesoporous calcium aluminate that recently has attracted many researchers from different fields of chemistry, with applications ranging from passive sampling to steam reforming [1,2,3,4,5,6]. The physical properties of mayenite are correlated to its crystalline structure. The electroneutrality condition is fulfilled by the presence of two oxide ions, O2− (free oxygen), trapped in the cages [6]. The high mobility of the free oxygen at high temperatures is a peculiar property of the mayenite exploited for many applications, including hydrogen storage, catalysis, fuel cells, oxidation of organic molecules, and electron conduction [7,8,9,10,11,12,13].
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