The Relation between Catalytic Activity of CO Oxidation and Support Structure in Oxidation Catalysts using Gold Nanoparticles

ABSTRACTThiol-passivated gold nanoparticles were adsorbed on several kinds of support materials such as titania-coated silica aerogels and xerogels etc., and then the thiol was removed by heat treatment. The catalytic activity of the prepared composites for CO oxidation reaction was measured, and the effects of the support on the catalytic activity were investigated. Density of the supports, namely, whether aerogel supports or xerogel ones, hardly affected the catalytic activity. It was found that the catalysts having high catalytic activity could be obtained by this preparation method, even using the xerogels as the support. Calcination of the supports before adsorption of the gold nanoparticles affected the activity. The difference of the catalytic activity was observed between the composites with same gold nanoparticle size, so it was considered that the surface condition of the support materials affects the state of gold nanoparticles in composite.

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High Catalytic Activity for CO Oxidation of Gold Nanoparticles Confined in Acidic Support Al-SBA-15 at Low Temperatures

The Journal of Physical Chemistry B ◽

10.1021/jp052867v ◽

2005 ◽

Vol 109 (38) ◽

pp. 18042-18047 ◽

Cited By ~ 85

Author(s):

Chia-Wen Chiang ◽

Aiqin Wang ◽

Ben-Zu Wan ◽

Chung-Yuan Mou

Keyword(s):

Gold Nanoparticles ◽

Catalytic Activity ◽

Co Oxidation ◽

Low Temperatures ◽

High Catalytic Activity ◽

Acidic Support

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Preparation of TiO2-supported twinned gold nanoparticles by CO treatment and their CO oxidation activity

Chemical Communications ◽

10.1039/c5cc05484b ◽

2015 ◽

Vol 51 (87) ◽

pp. 15823-15826 ◽

Cited By ~ 19

Author(s):

Junya Ohyama ◽

Taiki Koketsu ◽

Yuta Yamamoto ◽

Shigeo Arai ◽

Atsushi Satsuma

Keyword(s):

Gold Nanoparticles ◽

Catalytic Activity ◽

Co Oxidation ◽

Au Nanoparticles ◽

High Catalytic Activity ◽

Oxidation Activity

Au/TiO2 prepared by CO treatment showed high catalytic activity for CO oxidation due to twinned structure of Au nanoparticles.

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High Catalytic Activity of Pt/Al2O3 Catalyst in CO Oxidation at Room Temperature—A New Insight into Strong Metal–Support Interactions

Catalysts ◽

10.3390/catal11121475 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1475

Author(s):

Ireneusz Kocemba ◽

Izabela Śmiechowicz ◽

Marcin Jędrzejczyk ◽

Jacek Rogowski ◽

Jacek Michał Rynkowski

Keyword(s):

Catalytic Activity ◽

Co Oxidation ◽

Room Temperature ◽

Oxygen Adsorption ◽

High Catalytic Activity ◽

Adsorption Sites ◽

Co Oxidation Reaction ◽

Metal Support ◽

Metal Support Interactions ◽

Al2o3 Catalyst

The concept of very strong metal–support interactions (VSMSI) was defined in regard to the interactions that influence the catalytic properties of catalysts due to the creation of a new phase as a result of a solid-state chemical reaction between the metal and support. In this context, the high catalytic activity of the 1%Pt/Al2O3 catalyst in the CO oxidation reaction at room temperature was explained. The catalyst samples were reduced at different temperatures ranging from 500 °C to 800 °C and characterized using TPR, O2/H2 titration, CO chemisorption, TPD-CO, FTIR-CO, XRD, and TOF-SIMS methods. Based on the obtained results, it was claimed that with very high temperature reduction (800 °C), nonstoichiometric platinum species [Pt(Cl)Ox] strongly anchored to Al2O3 surface are formed. These species act as the oxygen adsorption sites.

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SIZE EFFECTS IN THE D-BAND MODEL OF CO OXIDATION BY GOLD NANOPARTICLES

«Узбекский физический журнал» ◽

10.52304/.v20i4.98 ◽

2018 ◽

Vol 20 (4) ◽

pp. 236-242

Author(s):

N. Turaeva

Keyword(s):

Gold Nanoparticles ◽

Catalytic Activity ◽

Fermi Level ◽

Co Oxidation ◽

Metal Cluster ◽

Band Model ◽

Co Oxidation Reaction ◽

Type Size ◽

Nuclear Processes

The volcano-type size dependence of the extraordinary catalytic activity of gold nanoparticles in CO oxidation is discussed on the basis of combination of the d-band model, the jellium model of metal clusters and the role of Fermi level in catalytic activity. The reaction rate depends non-monotonically upon the size of nanoparticles, due to exponential dependences of adsorption of reagents and desorption of products on the differences of the Fermi level of the metal cluster and antibonding states of CO and CO2 molecules forming chemical bonds with the nanoparticle, respectively. The origin of activation of the CO molecules towards the CO oxidation reaction by gold nanocatalysts is discussed in frame of the vibronic theory of chemical reactions based on the vibronic connection between charge transfer and nuclear processes.

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

Catalysts ◽

10.3390/catal11010131 ◽

2021 ◽

Vol 11 (1) ◽

pp. 131 ◽

Cited By ~ 1

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.

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

Journal of the American Chemical Society ◽

10.1021/ja1087979 ◽

2011 ◽

Vol 133 (10) ◽

pp. 3444-3451 ◽

Cited By ~ 181

Author(s):

Fan Yang ◽

Jesús Graciani ◽

Jaime Evans ◽

Ping Liu ◽

Jan Hrbek ◽

...

Keyword(s):

Catalytic Activity ◽

Co Oxidation ◽

High Catalytic Activity

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

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.11.008 ◽

2019 ◽

Vol 777 ◽

pp. 655-662 ◽

Cited By ~ 10

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

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High catalytic activity for CO oxidation on single Fe atom stabilized in graphene vacancies

RSC Advances ◽

10.1039/c6ra14476d ◽

2016 ◽

Vol 6 (96) ◽

pp. 93985-93996 ◽

Cited By ~ 44

Author(s):

Yanan Tang ◽

Jincheng Zhou ◽

Zigang Shen ◽

Weiguang Chen ◽

Chenggang Li ◽

...

Keyword(s):

Catalytic Activity ◽

Co Oxidation ◽

First Principles ◽

High Catalytic Activity ◽

First Principles Method

The geometric, electronic and catalytic characters of Fe atom embedded graphene (including monovacancy and divacancy) are investigated using the first-principles method, which gives a reference on designing graphene-based catalysts for CO oxidation.

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