Abstract
Mayenite (12CaO·7Al2O3) is a mesoporous calcium aluminum oxide, with a characteristic crystalline structure. The framework of mayenite is composed of interconnected cages with a positive electric charge per unit cell that includes two molecules [Ca24Al28O64]4+, and the remaining two oxide ions O2−, often labelled “free oxygen”, are trapped in the cages defined by the framework. Starting from mayenite structure several derivatives have been prepared through advanced synthetic protocols by free oxygen substitution with various anions. Mayenite and its derivates have been intensively investigated in many applications which include catalysis (oxidation and reduction, ammonia synthesis, pinacol coupling), environmental sensors and CO2 sorbent materials. In this review, we summarize our recent results on the main applications of mayenite and its derivatives.
Highlights
During the past decades an increasing interest has been devoted to the already known material called mayenite, mainly because of its peculiar chemical structure which is useful for a wide range of applications
The results showed that TCE was totally converted in CO2 and carbon monoxide (CO) and the released chlorine was incorporated in the mayenite structure
The selectivity was evaluated, and the results showed that the presence of Fe on the mayenite structure did not alter the selectivity of the reaction, and the main products observed were CO2, CO and hydrogen chloride (HCl)
Summary
Volatile Organic Compounds (VOCs) are emitted from a wide range of outdoor and indoor sources, such as transport and industrial processes as well as from household products (Heck et al 2012; Scirè and Liotta 2012). The C12A7 support obviously improves both the physicochemical properties and the catalytic activity of LSM monolith and it is a better supporting material for LSM monolith with respect to γ-Al2O3 These results are due to the mayenite capability to enhance the dispersion of LSM and to inhibit the interaction between LSM and cordierite or γ-Al2O3; both crystal structure and surface morphology of LSM phase can thereby be stable on the mayenite surface even at high temperature (up to 1050 °C). The Fe/CaO/Ca12Al14O33 bi-functional material showed the best properties for the simultaneous toluene steam reforming at low temperature and CO2 capture at 700 °C evaluated as a good compromise for CO2 sorption and biomass gasification. The enhancement of catalytic activity in tar conversion for these bi-functional materials compared to olivine was demonstrated and attributed to the presence of well-dispersed iron oxides and the high content of sorbent on the olivine surface
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