Parisa Sadeghpour, Mohammad Haghighi, Naser Ghasemian, Alireza Ebrahimi
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引用次数: 0
Abstract
In this research, the Mn–Ni–Co doped APSO-34 nanostructured materials were studied in the C3H8-assisted reduction of NOx. The MeAPSO-34 samples were prepared via ultrasound-assisted hydrothermal design upon the isomorphous substitution of transition metal ions into the crystalline lattice. Several characterization techniques such as XRD, FESEM, EDX dot-mapping, BET-BJH, FTIR and TPD-NH3 were used for study the properties of the catalysts. The XRD patterns indicated that the rate of nucleation and crystal growth were different for incorporating the various dopant ions in the CHA framework. The entrance of Mn and Co into the silicoaluminophosphate framework led to the formation of small particles with uniform distribution. Based on the acidity results, the MnCoAPSO-34 molecular sieve favored the increase in the density and strength of acid sites. Furthermore, it was found that the strength and density of acid sites may have a clear effect on catalytic NOx reduction. Therefore, the MnCoAPSO-34 zeolite showed the maximum conversion of NOx to N2 (76%) at reaction temperature of 450°C. Moreover, the mechanism of MeAPSO-34 synthesis and also a set of reaction stages for propane-assisted NOx reduction based on the obtained data were presented.
期刊介绍:
Theoretical Foundations of Chemical Engineering is a comprehensive journal covering all aspects of theoretical and applied research in chemical engineering, including transport phenomena; surface phenomena; processes of mixture separation; theory and methods of chemical reactor design; combined processes and multifunctional reactors; hydromechanic, thermal, diffusion, and chemical processes and apparatus, membrane processes and reactors; biotechnology; dispersed systems; nanotechnologies; process intensification; information modeling and analysis; energy- and resource-saving processes; environmentally clean processes and technologies.