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The Origin of an Unexpected Increase in NH3–SCR Activity of Aged Cu-LTA Catalysts
ACS Catalysis ( IF 11.3 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acscatal.7b02852
Nak Ho Ahn 1 , Taekyung Ryu 1 , Yonjoo Kang 1 , Hyojun Kim 1 , Jiho Shin 1 , In-Sik Nam 1 , Suk Bong Hong 1
Affiliation  

We have recently reported an increase in low-temperature NH3–SCR activity of the copper-exchanged (Cu/Al = 0.50), high-silica (Si/Al = 23) LTA catalyst when it is hydrothermally aged at 1023–1173 K. Here we demonstrate that this unexpected phenomenon originates from the migration of Cu+ ions present inside the sod cages of Cu-LTA to the vacant single 6-rings which accompanies their oxidation to Cu2+ ions during (hydro)thermal aging. Hence, the sod cages, which are inaccessible to almost all reactant species so as to be regarded as useless for zeolite catalysis, were found to serve as a “catalyst reservoir” during the course of nitrogen oxides (NOx) reduction with NH3.

中文翻译:

老化的Cu-LTA催化剂中NH 3 -SCR活性意外增加的原因

最近,我们报道了在1023–1173 K水热老化的情况下,铜交换(Cu / Al = 0.50),高二氧化硅(Si / Al = 23)LTA催化剂的低温NH 3 -SCR活性提高了在这里,我们证明了这种出乎意料的现象是由于存在于Cu-LTA草皮笼中的Cu +离子迁移到空的单个6环上,该环在(水)热老化过程中伴随着它们被氧化成Cu 2+离子。因此,人们发现几乎所有反应物物种都无法接近的草皮笼子被认为对沸石催化没有用,在用NH 3还原氮氧化物(NO x)的过程中,草皮笼子充当了“催化剂库”。
更新日期:2017-09-08
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