scholarly journals Titanium–silicon ferrierites and their delaminated forms modified with copper as effective catalysts for low-temperature NH3-SCR

RSC Advances ◽  
2021 ◽  
Vol 11 (18) ◽  
pp. 10847-10859
Author(s):  
Aneta Święs ◽  
Andrzej Kowalczyk ◽  
Marek Michalik ◽  
Urbano Díaz ◽  
Antonio E. Palomares ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Nh3 Scr ◽  
Titanium Silicon

Titanium–silicon ferrierites with different Si/Ti ratios and their delaminated forms were modified with copper by ion-exchange.

Effective catalysts for the low-temperature NH3-SCR process based on MCM-41 modified with copper by template ion-exchange (TIE) method

2018 ◽  
Vol 237 ◽  
pp. 927-937 ◽  
Author(s):  
Andrzej Kowalczyk ◽  
Aneta Święs ◽  
Barbara Gil ◽  
Małgorzata Rutkowska ◽  
Zofia Piwowarska ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Nh3 Scr ◽  
Mcm 41

scholarly journals Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH3-SCR

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1807
Author(s):  
Aleksandra Jankowska ◽  
Andrzej Kowalczyk ◽  
Małgorzata Rutkowska ◽  
Marek Michalik ◽  
Lucjan Chmielarz
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Ammonia Oxidation ◽  
Surface Acidity ◽  
Ammonia Solution ◽  
Exchange Method ◽  
Copper Species ◽  
Nh3 Scr ◽  
Side Process ◽  
Mcm 41

Aluminum containing silica spherical MCM-41 was synthesized and modified with copper by the template ion-exchange method (TIE) and its modified version, including treatment of the samples with ammonia solution directly after template ion-exchange (TIE-NH3). The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low temperature N2 sorption), morphology (SEM-EDS), form and aggregation of deposited copper species (UV-vis DRS), reducibility of copper species (H2-TPR), and surface acidity (NH3-TPD). The deposition of copper by the TIE-NH3 method resulted in much better dispersion of this metal on the MCM-41 surface comparing to copper introduced by TIE method. It was shown that such highly dispersed copper species, mainly monomeric Cu2+ cations, deposited on aluminum containing silica spheres of MCM-41, are significantly more catalytically effective in the NH3-SCR process than analogous catalysts containing aggregated copper oxide species. The catalysts obtained by the TIE-NH3 method effectively operated in much broader temperature and were less active in the side process of direct ammonia oxidation by oxygen.

Enhanced catalytic performance in low-temperature NH3-SCR process of spherical MCM-41 modified with Cu by template ion-exchange and ammonia treatment

2021 ◽  
Vol 315 ◽  
pp. 110920
Author(s):  
Aleksandra Jankowska ◽  
Agata Chłopek ◽  
Andrzej Kowalczyk ◽  
Małgorzata Rutkowska ◽  
Włodzimierz Mozgawa ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Catalytic Performance ◽  
Ammonia Treatment ◽  
Nh3 Scr ◽  
Mcm 41

scholarly journals Insight into the Promoting Role of Er Modification on SO2 Resistance for NH3-SCR at Low Temperature over FeMn/TiO2 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 618
Author(s):  
Huan Du ◽  
Zhitao Han ◽  
Xitian Wu ◽  
Chenglong Li ◽  
Yu Gao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalyst Surface ◽  
Impregnation Method ◽  
In Situ Drifts ◽  
Tio2 Catalyst ◽  
Nh3 Scr ◽  
Nh3 Adsorption ◽  
So2 Resistance ◽  
Fast Scr

Er-modified FeMn/TiO2 catalysts were prepared through the wet impregnation method, and their NH3-SCR activities were tested. The results showed that Er modification could obviously promote SO2 resistance of FeMn/TiO2 catalysts at a low temperature. The promoting effect and mechanism were explored in detail using various techniques, such as BET, XRD, H2-TPR, XPS, TG, and in-situ DRIFTS. The characterization results indicated that Er modification on FeMn/TiO2 catalysts could increase the Mn4+ concentration and surface chemisorbed labile oxygen ratio, which was favorable for NO oxidation to NO2, further accelerating low-temperature SCR activity through the “fast SCR” reaction. As fast SCR reaction could accelerate the consumption of adsorbed NH3 species, it would benefit to restrain the competitive adsorption of SO2 and limit the reaction between adsorbed SO2 and NH3 species. XPS results indicated that ammonium sulfates and Mn sulfates formed were found on Er-modified FeMn/TiO2 catalyst surface seemed much less than those on FeMn/TiO2 catalyst surface, suggested that Er modification was helpful for reducing the generation or deposition of sulfate salts on the catalyst surface. According to in-situ DRIFTS the results of, the presence of SO2 in feeding gas imposed a stronger impact on the NO adsorption than NH3 adsorption on Lewis acid sites of Er-modified FeMn/TiO2 catalysts, gradually making NH3-SCR reaction to proceed in E–R mechanism rather than L–H mechanism. DRIFTS.

Lead poisoning and regeneration of Mn-Ce/TiO2 catalysts for NH3-SCR of NO at low temperature

2021 ◽  
Vol 49 (1) ◽  
pp. 113-120
Author(s):  
Dong-jie YAN ◽  
Tong GUO ◽  
Ya YU ◽  
Zhao-hui CHEN
Keyword(s):  
Low Temperature ◽  
Lead Poisoning ◽  
Nh3 Scr ◽  
Scr Of No

scholarly journals Evaluation of Cu/SAPO-34 Catalysts Prepared by Solid-State and Liquid Ion-Exchange Methods for NOx Removal by NH3-SCR

ACS Omega ◽  
2019 ◽  
Vol 4 (12) ◽  
pp. 14699-14713 ◽  
Author(s):  
Maitane Urrutxua ◽  
Beñat Pereda-Ayo ◽  
Unai De-La-Torre ◽  
Juan R. González-Velasco
Keyword(s):  
Solid State ◽  
Ion Exchange ◽  
Nox Removal ◽  
Nh3 Scr

Improved NH3-SCR deNOx activity and tolerance to H2O & SO2 at low temperature over the NbmCu0.1-mCe0.9Ox catalysts: Role of acidity by niobium doping

Fuel ◽  
2021 ◽  
Vol 303 ◽  
pp. 121239
Author(s):  
Zhiping Zhang ◽  
Yingying Li ◽  
Piaoping Yang ◽  
Yushi Li ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Low Temperature ◽  
Niobium Doping ◽  
Nh3 Scr

Nb2O5-modified Mn-Ce/AC catalyst with high ZnCl2 and SO2 tolerance for low-temperature NH3-SCR of NO

2021 ◽  
Vol 9 (5) ◽  
pp. 106323
Author(s):  
Yuhan Zhou ◽  
Buxin Su ◽  
Shan Ren ◽  
Zhichao Chen ◽  
Zenghui Su ◽  
...  
Keyword(s):  
Low Temperature ◽  
Nh3 Scr ◽  
Scr Of No ◽  
So2 Tolerance
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