Synthesis of a chabazite-supported copper catalyst with full mesopores for selective catalytic reduction of nitrogen oxides at low temperature

doi:10.1016/S1872-2067(15)61072-5

Abstract

Abstract:

A series of meso-microporous copper-supporting chabazite molecular sieve (Cu-SAPO-34) catalysts with excellent performance in low-temperature ammonia selective catalytic reduction (NH₃-SCR) have been synthesized via a one-pot hydrothermal crystallization method. The physicochemical properties of the catalysts were characterized by scanning electron microscopy, transmission electron microscopy, N₂ adsorption-desorption measurements, X-ray diffraction, ²⁷Al magic angle spinning nuclear magnetic resonance, diffuse reflectance ultraviolet-visible spectroscopy, inductively coupled plasma-atomic emission spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction measurements, and electron paramagnetic resonance analysis. The formation of micro-mesopores in the Cu-SAPO-34 catalysts decreases diffusion resistance and greatly improves the accessibility of reactants to catalytic active sites. The main active sites for NH₃-SCR reaction are the isolated Cu²⁺ species displaced into the ellipsoidal cavity of the Cu-SAPO-34 catalysts.

Key words: One-pot synthesis, Meso-microporous Cu-SAPO-34, Low temperature, Selective catalytic reduction, Nitrogen oxides

Jixing Liu, Jian Liu, Zhen Zhao, Weiyu Song, Yuechang Wei, Aijun Duan, Guiyuan Jiang. Synthesis of a chabazite-supported copper catalyst with full mesopores for selective catalytic reduction of nitrogen oxides at low temperature[J]. Chinese Journal of Catalysis, 2016, 37(5): 750-759.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61072-5

https://www.cjcatal.com/EN/Y2016/V37/I5/750

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