Improved activity and stability of dealloyed bimodal nanoporous PtCo catalysts for CO oxidation

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 35340-35347 ◽  
Author(s):  
Dongwei Li ◽  
Hui Wang ◽  
Chunying Shi ◽  
Xiaohong Xu
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Ptco Alloy

An unsupported dealloyed bimodal nanoporous PtCo alloy exhibited significantly improved catalytic activity and stability for CO oxidation.

scholarly journals CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 131 ◽  
Author(s):  
Rola Mohammad Al Soubaihi ◽  
Khaled Mohammad Saoud ◽  
Myo Tay Zar Myint ◽  
Mats A. Göthelid ◽  
Joydeep Dutta
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Active Sites ◽  
Bond Activation ◽  
Dissociative Adsorption ◽  
High Catalytic Activity ◽  
Good Catalytic Activity ◽  
Pretreatment Conditions ◽  
Oxidation Efficiency

Carbon monoxide (CO) oxidation is considered an important reaction in heterogeneous industrial catalysis and has been extensively studied. Pd supported on SiO2 aerogel catalysts exhibit good catalytic activity toward this reaction owing to their CO bond activation capability and thermal stability. Pd/SiO2 catalysts were investigated using carbon monoxide (CO) oxidation as a model reaction. The catalyst becomes active, and the conversion increases after the temperature reaches the ignition temperature (Tig). A normal hysteresis in carbon monoxide (CO) oxidation has been observed, where the catalysts continue to exhibit high catalytic activity (CO conversion remains at 100%) during the extinction even at temperatures lower than Tig. The catalyst was characterized using BET, TEM, XPS, TGA-DSC, and FTIR. In this work, the influence of pretreatment conditions and stability of the active sites on the catalytic activity and hysteresis is presented. The CO oxidation on the Pd/SiO2 catalyst has been attributed to the dissociative adsorption of molecular oxygen and the activation of the C-O bond, followed by diffusion of adsorbates at Tig to form CO2. Whereas, the hysteresis has been explained by the enhanced stability of the active site caused by thermal effects, pretreatment conditions, Pd-SiO2 support interaction, and PdO formation and decomposition.

scholarly journals On the Effects of Doping on the Catalytic Performance of (La,Sr)CoO3. A DFT Study of CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 312 ◽  
Author(s):  
Antonella Glisenti ◽  
Andrea Vittadini
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Formation Energy ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Energy Profiles ◽  
High Concentrations ◽  
3D Impurities

The effects of modifying the composition of LaCoO3 on the catalytic activity are predicted by density functional calculations. Partially replacing La by Sr ions has benefical effects, causing a lowering of the formation energy of O vacancies. In contrast to that, doping at the Co site is less effective, as only 3d impurities heavier than Co are able to stabilize vacancies at high concentrations. The comparison of the energy profiles for CO oxidation of undoped and of Ni-, Cu-m and Zn-doped (La,Sr)CoO3(100) surface shows that Cu is most effective. However, the effects are less spectacular than in the SrTiO3 case, due to the different energetics for the formation of oxygen vacancies in the two hosts.

CO Oxidation on Inverse CeOx/Cu(111) Catalysts: High Catalytic Activity and Ceria-Promoted Dissociation of O2

2011 ◽  
Vol 133 (10) ◽  
pp. 3444-3451 ◽  
Author(s):  
Fan Yang ◽  
Jesús Graciani ◽  
Jaime Evans ◽  
Ping Liu ◽  
Jan Hrbek ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
High Catalytic Activity

Effect of Impurity and Pretreatment Conditions on the Catalytic Activity of Au Powder for CO Oxidation

2004 ◽  
Vol 97 (3/4) ◽  
pp. 203-208 ◽  
Author(s):  
Yasuo Iizuka ◽  
Aya Kawamoto ◽  
Kazuhiro Akita ◽  
Masakazu Daté ◽  
Susumu Tsubota ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Pretreatment Conditions

Synthesis and characterization of new isostructural series LnFe0.5Sb1.5O6 (Ln = La-Sm) exhibiting high catalytic activity in CO oxidation

2019 ◽  
Vol 777 ◽  
pp. 655-662 ◽  
Author(s):  
A.V. Egorysheva ◽  
O.G. Ellert ◽  
E. Yu Liberman ◽  
D.I. Kirdyankin ◽  
S.V. Golodukhina ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Synthesis And Characterization ◽  
High Catalytic Activity

Effects of precipitants and surfactants on catalytic activity of Pd/CeO2 for CO oxidation

2017 ◽  
Vol 43 (11) ◽  
pp. 6187-6205
Author(s):  
Yue Zhou ◽  
Xin Liu ◽  
Qiulin Zhang ◽  
Qixian Liu ◽  
Zhongxian Song ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation

scholarly journals Chemical environment of Ag atoms contained in Au Ag bimetallic catalysts and the generation of the catalytic activity for CO oxidation

2014 ◽  
Vol 483 ◽  
pp. 63-75 ◽  
Author(s):  
Yasuo Iizuka ◽  
Ryou Inoue ◽  
Takumi Miura ◽  
Nobuyasu Morita ◽  
Naoki Toshima ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Bimetallic Catalysts ◽  
Chemical Environment

The effect of defects on the catalytic activity of single Au atom supported carbon nanotubes and reaction mechanism for CO oxidation

2017 ◽  
Vol 19 (33) ◽  
pp. 22344-22354 ◽  
Author(s):  
Sajjad Ali ◽  
Tian Fu Liu ◽  
Zan Lian ◽  
Bo Li ◽  
Dang Sheng Su
Keyword(s):  
Carbon Nanotubes ◽  
Density Functional Theory ◽  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Reaction Mechanism ◽  
Co Oxidation ◽  
Density Functional ◽  
Functional Theory ◽  
Single Walled Carbon Nanotube ◽  
Wales Defect

The mechanism of CO oxidation by O2 on a single Au atom supported on pristine, mono atom vacancy (m), di atom vacancy (di) and the Stone Wales defect (SW) on single walled carbon nanotube (SWCNT) surface is systematically investigated theoretically using density functional theory.

scholarly journals Catalytic Activity of Mesoporous SBA-15 modified with Pt and Ti in a Deep Methane, Hristo Kolevn-hexane and CO Oxidation

2014 ◽  
Vol 1 (1) ◽  
pp. 9-20 ◽  
Author(s):  
Hristo Kolev ◽  
Silviay Todorova ◽  
Anton Naydenov ◽  
Ramona Ene ◽  
Georgi Ivanov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation
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