A Novel Synthetic Route to Prepare High Surface Area Mayenite Catalyst for TCE Oxidation

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.

The Effect of Mesoporous Bioactive Glass Nanoparticles/Graphene Oxide Composites on the Differentiation and Mineralization of Human Dental Pulp Stem Cells

“…MBN exhibited broad bands between approximately 20 and 30 • and did not have any sharp diffraction peaks, indicating that it had an amorphous structure due to the presence of silica groups [12]. Diffraction peaks were observed after the addition of GO, which can be attributed to the calcite phase (CaCO 3 , JCPDS #05-0586) (2θ = 23.0, 29.3, 35.9, 39.3, and 43.1 • ) [13]. The calcite phase is formed during the interaction between calcium oxide and GO.…”

“…Both MBN/GO composites were amorphous, similar to MBNs alone. Calcite peaks of the crystalline phase (CaCO 3 , JCPDS #05-0586) were observed at 23.0, 29.3, 35.9, 39.3, and 43.1 •[13][14][15][16].…”

The Effect of Calcination Temperature on the Structure and Performance of Nanocrystalline Mayenite Powders

“…The engineering applications of C-A powders depend considerably on their crystallite size and composition which are determined by the rate and temperature of calcination during synthesis [17]. Various preparation techniques, such as solid state routes [18], sol-gel [19,20,21], hydrothermal followed by calcination [17,22], the Pechini process [23], oxalate-precursor co-precipitation [24], the glycine/nitrate procedure-GNP [23,25], the spray pyrolysis method [26] and synthesis based on polymethyl methacrylate (PMMA) as a soft templating agent [27] are employed to prepare calcium aluminate powders composed of nanoparticles (NPs).…”

Oxidative Degradation of Trichloroethylene over Fe2O3-doped Mayenite: Chlorine Poisoning Mitigation and Improved Catalytic Performance

“…In previous works, we reported about the oxidation of TCE by using the mesoporous calcium aluminate mayenite (Ca 12 Al 14 O 33 ) as a catalyst [18][19][20][21][22]; mayenite had a good overall performance, showing high activity and selectivity towards nontoxic compounds, and fair thermal stability and recyclability. As a main drawback, the material shows a certain tendency towards chlorine poisoning, leading to slow deactivation of the catalyst.…”