Catalytic performance of vanadia-doped titania-pillared clay for the selective catalytic oxidation of H2S

2009 ◽  
Vol 15 (2) ◽  
pp. 207-211 ◽  
Author(s):  
Kanattukara Vijayan Bineesh ◽  
Sang-Yun Kim ◽  
Balasamy Rabindran Jermy ◽  
Dae-Won Park
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Performance ◽  
Pillared Clay ◽  
Selective Catalytic Oxidation ◽  
Doped Titania

Vanadium-doped titania-pillared montmorillonite clay as a catalyst for selective catalytic reduction of NO by ammonia

Clay Minerals ◽  
1997 ◽  
Vol 32 (4) ◽  
pp. 665-672 ◽  
Author(s):  
K. Bahranowski ◽  
J. Janas ◽  
T. Machej ◽  
E. M. Serwicka ◽  
L. A. Vartikian
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Pillared Clay ◽  
Area Measurement ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Reduction Of No ◽  
Pillared Montmorillonite ◽  
Doped Titania

AbstractA series of V-doped titania-pillared clay catalysts, characterized by ICP-AES chemical analysis, X-ray diffraction, BET surface area measurement, and ESR spectroscopy, have been tested in the selective catalytic reduction of NO by NH3. An ESR analysis shows that V dopant is anchored to the titania pillars. Vanadyl species with differing degrees of in-plane V-O π-covalent bonding are produced depending on the method of sample preparation. Polymeric V species appear as the V content is increased. Catalytic performance of these systems depends on the method of preparation and on the V content. The best catalyst, converting 90-100% NO in the temperature range 523-623 K, is obtained by exchange of pillared montmorillonite with vanadyl ions, at an extent of exchange below the level where significant amounts of polymeric V species appear. The co-pillared catalyst, containing vanadyl centres characterized by a higher degree of in-plane ncovalent bonding (according to ESR), is less selective than the exchanged samples.

Role of the Cu content and Ce activating effect on catalytic performance of Cu-Mg-Al and Ce/Cu-Mg-Al oxides in ammonia selective catalytic oxidation

2021 ◽  
pp. 151540
Author(s):  
Sylwia Górecka ◽  
Kateřina Pacultová ◽  
Aneta Smýkalová ◽  
Dagmar Fridrichová ◽  
Kamil Górecki ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Catalytic Performance ◽  
Cu Content ◽  
Selective Catalytic Oxidation

Selective catalytic oxidation of H2S over V2O5 supported on TiO2-pillared clay catalysts in the presence of water and ammonia

2011 ◽  
Vol 53 (2) ◽  
pp. 204-211 ◽  
Author(s):  
Kanattukara Vijayan Bineesh ◽  
Dong-Kyu Kim ◽  
Moon-IL Kim ◽  
Dae-Won Park
Keyword(s):  
Catalytic Oxidation ◽  
Pillared Clay ◽  
Selective Catalytic Oxidation ◽  
Clay Catalysts

scholarly journals Ruthenium-doped Titania-pillared Clay for The Selective Catalytic Oxidation of Cyclohexene: Influence of Ru Loading

2019 ◽  
Vol 14 (3) ◽  
pp. 614
Author(s):  
Ahmed Dali ◽  
Ilhem Rekkab-Hammoumraoui ◽  
Sanaa El Korso ◽  
Souheyla Boudjema ◽  
Abderrahim Choukchou-Braham
Keyword(s):  
Surface Acidity ◽  
Pillared Clay ◽  
Major Product ◽  
Acid Activation ◽  
X Ray Diffraction ◽  
Tert Butylhydroperoxide ◽  
Selective Catalytic Oxidation ◽  
Volume Measurements ◽  
Doped Titania ◽  
Catalytic Performances

A series of ruthenium-based catalysts supported on acid-activated montmorillonite (PILC) and interspersed with titanium (Ru/Ti-PILCs) were prepared with various amounts of ruthenium. Their catalytic performances in the selective oxidation of cyclohexene, using tert-butylhydroperoxide (TBHP) as oxidant were checked. The clay structure modification by acid activation and impregnation of transition metals resulted in an enhanced Lewis and Bronsted acidities. The Ru/Ti-PILCs materials were characterized using X-ray diffraction (XRD), surface area and pore volume measurements, surface acidity followed by Fourier transform infrared (FTIR) spectroscopy, chemical analysis, and Scanning Electron Microscopy (SEM). It was found that all catalysts can selectively oxidize cyclohexene through allylic oxidation leading mainly to 2-cyclohexene-1-one (Enone) as the major product, and 2-cyclohexene-1-ol (Enol) as secondary product. With the 5 %Ru/Ti-PILC, it was possible to reach 59 % cyclohexene total conversion, and 87 % selectivity into 2-cyclohexene-1-one and 13 % selectivity into 2-cyclohexene-1-ol. Copyright © 2019 BCREC Group. All rights reserved 

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