Open AccessInfluence of hydrothermal time on the formation of SAPO-56 structure and its catalytic activity of removal NOx by NH3-SCR with Cu/SAPO-56
Author(s) -
Anh Dang Thi Thu,
Dat Nguyen Tien,
Tuan Doan Anh,
Huyen Vuong Thanh,
Huyen Pham Thanh
Publication year - 2021
Publication title -
xúc tác và hấp phụ
Language(s) - English
Resource type - Journals
ISSN - 0866-7411
DOI - 10.51316/jca.2022.001
Subject(s) - catalysis , hydrothermal circulation , chemistry , diffuse reflectance infrared fourier transform , nox , desorption , selective catalytic reduction , adsorption , molecular sieve , aqueous solution , spectroscopy , ion exchange , hydrothermal synthesis , electron paramagnetic resonance , scanning electron microscope , hexane , ion , inorganic chemistry , materials science , chemical engineering , organic chemistry , photocatalysis , nuclear magnetic resonance , physics , quantum mechanics , engineering , composite material , combustion
The SAPO-56 molecular sieve material was prepared under hydrothermal conditions at 200 °C with different hydrothermal times using precursors including Al(OH)3, LUDOX AS-30, H3PO4, and TMHD (N,N,N′,N′-tetramethyl-hexane-1,6-diamine) as an organic structure-directing agent. The samples were characterized by X-ray diffraction, field emission scanning electron microscopes, Energy-dispersive X-ray spectroscopy, NH3 temperature - programmed desorption, N2 adsorption-desorption, and UV-Vis Diffuse Reflectance Spectroscopy methods. Electron paramagnetic resonance technique was applied to determine isolated Cu2+ ions in the framework. Although materials shared the same AFX framework structure, they owned different physicochemical properties, especially in terms of crystal size, surface area, and acidity. Next, the catalytic activity of removal NOx of Cu/SAPO-56 and Cu/ZSM-5 using commercial ZSM-5 as support with the loading of 3 wt%Cu synthesized by aqueous ion-exchange method was assessed in the selective catalytic reduction with NH3.