The influence of holmium on catalytic properties of Fe or Cu-modified vermiculites

被引：7
作者：
Samojeden, Bogdan [1 ]
Grzybek, Teresa [1 ]
Kowal, Joanna [1 ]
Szymaszek, Agnieszka [1 ]
Jablonska, Magdalena [2 ]
Glaeser, Roger [2 ]
Motak, Monika [1 ]
机构：
[1] AGH Univ Sci & Technol, Fac Energy & Fuels, Al Mickiewicza 30, PL-30059 Krakow, Poland
[2] Univ Leipzig, Inst Chem Technol, Linnestr 3, D-04103 Leipzig, Germany
来源：
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING | 2019年 / 55卷 / 06期
关键词：
selective catalytic reduction; deNO(x); holmium; vermiculite; TITANIA-PILLARED MONTMORILLONITE; ACID-ACTIVATED VERMICULITES; NO; TEMPERATURE; NH3; REDUCTION; SCR; OXIDE; IRON; CO;
D O I：
10.5277/ppmp19074
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Natural layered clay, vermiculite, was modified and tested as catalyst for the selective catalytic reduction of NOx with ammonia (NH3-SCR). Its modification included the application of the blowing agent (azodicarbonamide), acid treatment and pillaring with Al2O3. Active phase (transition metals: Cu or Fe) was introduced via impregnation. The obtained materials were characterized by N-2 sorption (texture), XRD (structure), DR-UV-Vis (oxidation state and aggregation of the active phase), H-2-TPR (reducibility of the active phase), in situ DRIFTS (types of adsorbed species due to contact of the sample NH3) and NH3-TPD (type/strength of the acidic sites). The initial modification procedures (treatment with azodicarboamide) resulted in the increase of specific surface area of vermiculite. The introduction of transition metal ions provided a significant amount of acidic sites. The promoting impact of holmium was confirmed by the increased strength of the sites. The highest catalytic activity was exhibited by the sample Fe-containing vermiculite and doped with Ho.
引用
收藏
页码：1484 / 1495
页数：12
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