催化作用
选择性催化还原
煅烧
环己胺
分子筛
氨
结构精修
布朗斯特德-洛瑞酸碱理论
化学
质子化
氮氧化物
无机化学
热液循环
氢键
化学工程
核化学
结晶学
物理化学
晶体结构
有机化学
分子
离子
工程类
燃烧
作者
Xiaona Liu,Yi Cao,Nana Yan,Chao Ma,Lei Cao,Peng Guo,Peng Tian,Zhongmin Liu
出处
期刊:Chinese Journal of Catalysis
[China Science Publishing & Media Ltd.]
日期:2020-11-01
卷期号:41 (11): 1715-1722
被引量:6
标识
DOI:10.1016/s1872-2067(20)63609-9
摘要
The high-temperature (HT) and low-temperature (LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia (NH3-SCR). In this paper, we report a catalyst, Cu2+ loading SAPO-17, synthesized using cyclohexylamine (CHA), which is commercially available and inexpensive and is utilized in NH3-SCR reduction for the first time. After systematic investigations on the optimization of Si and Cu2+ contents, it was concluded that Cu-SAPO-17-8.0%-0.22 displays favorable catalytic performance, even after being heated at 353 K for 24 h and at 973 K for 16 h. Moreover, the locations of CHAs, host–guest interaction and the Brönsted acid sites were explored by Rietveld refinement against powder X-ray diffraction data of as-made SAPO-17-8.0%. The refinement results showed that two CHAs exist within one eri cage and that the protonated CHA forms a hydrogen bond with O4, which indicates that the proton bonding with O4 will form the Brönsted acid site after the calcination.
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