Efficient synthesis of the Cu-SAPO-44 zeolite with excellent activity for selective catalytic reduction of NOx by NH3
Efficient synthesis of the Cu-SAPO-44 zeolite with excellent activity for selective catalytic reduction of NOx by NH3
复制标题
高效合成具有优异NH3选择性催化还原NOx活性的Cu-SAPO-44沸石
DOI：
10.1016/j.cattod.2018.08.018
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发表时间：
--
期刊：
影响因子：
5.3
通讯作者：
Zhaoliang Zhang
中科院分区：
文献类型：
--
作者：
Ying Xin;Nana Zhang;Xiao Wang;Qian Li;Xicheng Ma;Yongxin Qi;Lirong Zheng;James A. Anderson;Zhaoliang Zhang
A small-pore Cu-chabazite zeolite, Cu-SAPO-44 was synthesized using a one-pot approach by combination of cyclohexylamine template and copper-amine complex. The Cu-SAPO-44 zeolite obtained exhibits excellent activity over a wide temperature window from 200 to 500 °C for the selective catalytic reduction of NOxwith ammonia (NH3-SCR). The copper-amine complex allowed direct introduction as well as a high dispersion of extra-framework Cu species in the chabazite structure.In situX-ray absorption fine structure (XAFS) confirmed the isolated Cu2+ions and Cu2+↔ Cu+cycle. Temperature-programmed reduction with H2(H2-TPR) andin situFTIR of CO adsorption demonstrated that a variety of isolated Cu2+ions inside the large cages and in or near the six-membered rings of the chabazite structure are responsible for the wide temperature window of activity. Cu-SAPO-44 has shown to be a promising candidate as a SCR catalyst with great potential in after-treatment systems for either mobile or stationary sources.
