The synthesis of Cu/SAPO-34 catalysts and evaluation ability of NOx treatment by NH3-SCR with Cu/ZSM-5 catalyst using commercial ZSM-5 as support

Le Nguyen; Khanh Dinh; Tuan Doan; Huyen Vuong; Huyen Pham

doi:10.51316/jca.2020.026

Authors

Nguyen Hong Le Hanoi University of Science and Technology Author
Dinh Van Khanh Hanoi University of Science and Technology Author
Doan Anh Tuan Hanoi University of Science and Technology Author
Vuong Thanh Huyen Hanoi University of Science and Technology Author
Pham Thanh Huyen Hanoi University of Science and Technology Author

DOI:

https://doi.org/10.51316/jca.2020.026

Keywords:

Cu/SAPO-34, Cu/ZSM-5, SAPO-34, AS-30

Abstract

SAPO-34 molecular sieves were synthesized under hydrothermal conditions using different combinations of tetraethyl ammonium hydroxide (TEAOH), morpholine (Mor), and triethylamine (TEA) as organic structure-directing agents and economical silicon source by colloidal silica LUDOX AS-30. The products were characterized by X-ray diffraction, Field Emission Scanning Electron Microscopes, Energy-dispersive X-ray spectroscopy, NH₃ temperature - programmed desorption, N₂ adsorption-desorption. Electron paramagnetic resonance technique was applied to identify isolated Cu²⁺ ions in the framework. Although materials with the same chabazite framework structure are obtained, they possess different physicochemical properties, especially crystal size and acidity. Catalytic performances of Cu/SAPO-34 and Cu/ZSM-5 using commercial ZSM-5 as support with the loading of 3 wt% prepared by liquid ion-exchange method was performed for selective catalytic reduction (SCR) of NO_x with NH₃.

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