Modulation of electronic and redox properties in phenolate-rich cobalt(iii) complexes and their implications for catalytic proton reduction

2015 ◽  
Vol 44 (7) ◽  
pp. 3454-3466 ◽  
Author(s):  
Debashis Basu ◽  
Marco M. Allard ◽  
Fernando R. Xavier ◽  
Mary Jane Heeg ◽  
H. Bernhard Schlegel ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Cobalt Complexes ◽  
Redox Properties ◽  
Proton Reduction

The redox, spectroscopic and catalytic activity of a series of cobalt complexes with phenolate-rich environments was investigated. The complex [CoIII(LCl)MeOH] shows considerable proton reduction in MeCN:HOAc with TON = 10.8.

Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity Porosity, Redox Properties and Catalytic Activity

2017 ◽  
Vol 148 (1) ◽  
pp. 258-266 ◽  
Author(s):  
Arantxa Davó-Quiñonero ◽  
Jorge González-Mira ◽  
Dolores Lozano-Castelló ◽  
Agustín Bueno-López
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Doped Ceria ◽  
Templated Synthesis

Remarkable Activity of Nanoarchitectonics Mesoporous CuO/CeO2–TiO2 Prepared by Nanocasting and Deposition Precipitation Techniques

2020 ◽  
Vol 20 (5) ◽  
pp. 2791-2802
Author(s):  
Duangamol Ongmali ◽  
Sakollapath Pithakratanayothin ◽  
Sureerat Jampa ◽  
Apanee Luengnaruemitrchai ◽  
Thanyalak Chaisuwan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Crystallite Size ◽  
Oxygen Vacancies ◽  
Redox Properties ◽  
Oxygen Defect ◽  
Nitrate Salt ◽  
Hard Template ◽  
Different Levels

In this work, a ceria (CeO2) support was modified with titania (TiO2) by nanocasting using MCM-48 as a hard template and then loading Cu (as the nitrate salt) at different levels (3–9% by weight) by deposition-precipitation followed by calcination. The addition of TiO2 in MSP CeO2 revealed that the MSP CeO2 was significantly improved the oxygen vacancies of the catalyst by increasing the Ce3+ content from 38 to 75% and stabilizing the Ce3+ species by bonding with the oxygen as Ce(4f)-O(2p)-Ti(3d). Moreover, the bonding of MSP CeO2 with TiO2 generated the oxygen defect vacancies (s–Ti3+), allowing Cu2+ to occupy and be reduced to Cu+ during calcination. The smaller CeO2 crystallite size (2.7 nm) of 9Cu/CeO2–TiO2 increased the mass-specific CO-Oxidation, showing the best catalytic activity due to its highest redox properties, as determined by H2-TPR and also showing resistant property to water and carbon dioxide. Indeed, water was adsorbed on the Ce3+ sites, generating OHads which reacted with CO to form –COOH, resulting in CO2.

Ambidentate and redox-properties of 4,7-phenanthroline-5,6-dione in cobalt complexes: a quantum chemical study

2018 ◽  
Vol 67 (7) ◽  
pp. 1182-1189 ◽  
Author(s):  
A. G. Starikov ◽  
А. А. Tsaturyan ◽  
А. А. Starikova ◽  
Е. А. Gusakov ◽  
V. I. Minkin
Keyword(s):  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Cobalt Complexes ◽  
Chemical Study ◽  
Redox Properties

Influence of Gd and Pr doping on the properties of ceria: texture, structure, redox behaviour and reactivity in CH4/H2O reactions in the presence of H2S

2018 ◽  
Vol 8 (5) ◽  
pp. 1333-1348 ◽  
Author(s):  
M. Florea ◽  
G. Postole ◽  
F. Matei-Rutkovska ◽  
A. Urda ◽  
F. Neaţu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Redox Behaviour ◽  
Texture Structure ◽  
Thermal Sintering

Resistance against thermal sintering, redox properties and catalytic activity in SMR over ceria can be tuned by doping/undoping.

Synthesis of characteristic polyisoprenes using rationally designed iminopyridyl metal (Fe and Co) precatalysts: investigation of co-catalysts and steric influence on their catalytic activity

2020 ◽  
Vol 44 (19) ◽  
pp. 8076-8084 ◽  
Author(s):  
Wenhua Lin ◽  
Liping Zhang ◽  
Hongyi Suo ◽  
Arumugam Vignesh ◽  
Nighat Yousuf ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Cobalt Complexes ◽  
Co Catalysts ◽  
Isoprene Polymerization ◽  
Steric Influence

A series of iminopyridyl ligand-based iron and cobalt complexes are utilized as catalysts in isoprene polymerization, in which the microstructure of resultant polyisoprenes was investigated.

Ultrasound Influence on Kinetics of Phenol Sulphoxidation in Water Solutions in the Presence of Cobalt Complexes Immobilized on Polyacrylic Acid

2010 ◽  
Vol 1279 ◽  
Author(s):  
C.c.s. Shakieva T. V.
Keyword(s):  
Catalytic Activity ◽  
Exposure Time ◽  
Polyacrylic Acid ◽  
Binuclear Complex ◽  
Modulation Frequency ◽  
Cobalt Complexes ◽  
Cobalt Concentration ◽  
Ultrasonic Sound ◽  
Kinetics Of ◽  
Phenol Conversion

AbstractThe influence of hypersonic on phenol sulfoxidation kinetics in the presence of cobalt complexes fixed on polyacrylic acid (PAA) is investigated in the soft conditions (313-333K). Products are p- and o-phenolsulfonic acids. Phenol conversion under the investigated conditions reaches 98-100 %. The ultrasonic sound in the interval from 0 to 60 kHz leads to aggrandizement of trivalent cobalt concentration in a solution, as a result, increasing the reaction activity. The enlargement of ultrasound influence (USI) modulation frequency and the exposure time results in destruction of a binuclear complex, which may be responsible for enhanced catalytic activity. KEDWORDS: ultrasound influence; polyacrylic acid; immobilized cobalt complexes; kinetics

Effect of Addition of Ce on the Catalytic Activity of Fe-Mn-O Catalyst for SCR of NOX with NH3

2011 ◽  
Vol 347-353 ◽  
pp. 453-456
Author(s):  
Hai Zhao ◽  
You Ning Xu ◽  
Duo Jiao Guan
Keyword(s):  
Nitric Oxide ◽  
Catalytic Activity ◽  
Analysis Data ◽  
Redox Properties ◽  
Nanosized Particles ◽  
Study Analysis ◽  
Catalytic Activities ◽  
Mn Oxide ◽  
Scr Of No ◽  
Mn Species

Fe-Mn oxide and Ce-doped Fe-Mn oxide nanosized particles were studied on the structural and catalytic activities for SCR. The catalysts were characterized by TEM, TPR and BET study. Analysis data show that the addition of Ce improves the reduction performance of Fe-Mn species. It was found that the Ce promoted samples exhibited much better activities for SCR of nitric oxide with ammonia because of the promotion of the structural and redox properties.

scholarly journals Bimetallic nickel–cobalt hydrides in H2 activation and catalytic proton reduction

2019 ◽  
Vol 10 (3) ◽  
pp. 761-767 ◽  
Author(s):  
Xiaoxiao Chu ◽  
Jihao Jin ◽  
Bangrong Ming ◽  
Maofu Pang ◽  
Xin Yu ◽  
...  
Keyword(s):  
Redox Properties ◽  
Proton Reduction ◽  
Nickel Cobalt

The synergism of the redox properties of nickel and cobalt enables bimetallic NiCo complexes to process H2.

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