Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (5): 750-759.DOI: 10.1016/S1872-2067(15)61072-5

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

Jixing Liu, Jian Liu, Zhen Zhao, Weiyu Song, Yuechang Wei, Aijun Duan, Guiyuan Jiang   

  1. State Key Laboratory of Heavy Oil and Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum, Beijing 102249, China
  • Received:2016-01-10 Revised:2016-02-22 Online:2016-04-26 Published:2016-04-26
  • Contact: Jian Liu
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21376261, 21173270), the National High Technology Research and Development Program of China (863 Program, 2015AA034603), the Beijing Natural Science Foundation (2142027), and the China University of Petroleum Fund (20130007110007, 2462015QZDX04).

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