Physicochemical characterization and catalytic performance of 10% Ag/CeO 2 catalysts prepared by impregnation and deposition–precipitation

Skaf, Mira; Aouad, Samer; Hany, Sara; Cousin, Renaud; Abi‐Aad, Edmond; Aboukaı̈s, Antoine

doi:10.1016/j.jcat.2014.10.006

Cited by 75 publications

(38 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[142] the presence of silver in high oxidation state was considered responsible for high catalytic activity of Ag/CeO 2 composites. Using EPR technique it was shown that this is connected with the presence of Ag 2+ ions (isotopes 107 Ag 2+ and 109 Ag 2+ were detected) along with Ag + and Ag 0 in the Ag/CeO 2 -Imp sample, while this was not observed in case of Ag/CeO 2 -DP ( Figure 14, A) [41]. In the presence of Ag 2+ ions, a mobility of some oxygen species increases, which sets conditions for the formation of three redox couples (Ag 2+ /Ag + , Ag 2+ /Ag 0 , and Ag + /Ag 0 ).…”

Section: Vocs Abatementmentioning

confidence: 98%

“…Besides formaldehyde, Ag/CeO 2 catalysts were also used to oxidize other VOCs, e.g. methanol, toluene, acetone, and naphthalene [41,54,[141][142][143]. In these articles, a comparison of catalysts prepared by different methods was represented.…”

Section: Vocs Abatementmentioning

confidence: 99%

“…In Refs. [41,142] the comparison of the catalytic activity of M/CeO 2 composites (M = Au, Cu, Ag) prepared by conventional wet impregnation and deposition-precipitation methods was carried out in propylene oxidation. It was shown that the Ag-containing catalyst prepared by conventional wet impregnation method possessed higher catalytic activity.…”

Section: Vocs Abatementmentioning

confidence: 99%

“…For this reason, highly active and relatively inexpensive Ag/CeO 2 composite is considered promising heterogeneous catalyst for total oxidation of harmful organic compounds, including formaldehyde [40], , soot [44][45][46][47][48][49]. The Ag/CeO 2 composites can also be used in photo-[50] and electrocatalysis [51,52], reduction of NO x [41], methane oxidation reaction [53], preferential oxidation of CO in excess of H 2 (PROX CO) [54,55] as well as in biochemistry due to the bactericidal properties of both ceria and silver [56]. It is noteworthy also that these composites are applied in selective oxidation of organic compounds.In this review, we provide a survey of the current state of catalytic total oxidation of CO, soot, and VOCs over Ag/CeO 2 catalysts.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

et al. 2018

View full text Add to dashboard Cite

Nowadays catalytic technologies are widely used to purify indoor and outdoor air from harmful compounds. Recently, Ag-CeO 2 composites have found various applications in catalysis due to distinctive physical-chemical properties and relatively low costs as compared to those based on other noble metals. Currently, metal-support interaction is considered the key factor that determines high catalytic performance of silver-ceria composites. Despite thorough investigations, several questions remain debating. Among such issues, there are (1) morphology and size effects of both Ag and CeO 2 particles, including their defective structure, (2) chemical and charge state of silver, (3) charge transfer between silver and ceria, (4) role of oxygen vacancies, (5) reducibility of support and the catalyst on the basis thereof. In this review, we consider recent advances and trends on the role of silver-ceria interactions in catalytic performance of Ag/CeO 2 composites in low-temperature CO oxidation, soot oxidation, and volatile organic compounds (VOCs) abatement. Promising photoand electrocatalytic applications of Ag/CeO 2 composites are also discussed.Au [17][18][19][20][21][22][23], Ru [24,25], Rh [26][27][28][29], and Cu [30,31] were proposed. Metal oxide-based catalysts (Co 3 O 4 [32], MnO x [33], etc.) also attracted wide interest. However, a significant part of the developed catalysts has limited use under real conditions due to high costs of noble metals (the loading of palladium, platinum, gold is of 2-10 wt. %), relatively low stability to "hard" conditions of oxidation processes causing the loss of active component and reduction of the catalyst activity and selectivity. Therefore, the development of high-performance affordable and stable catalysts for low-temperature total oxidation of harmful compounds is still challenging. Efficiency and costs of such catalysts are connected with proper selection of the type of active component, support, and preparation method [34].Recently, supported silver catalysts have brought about wide interest due to their high activity in low-temperature oxidation processes. Different supports are studied (SiO 2 , CeO 2 , MnO x , TiO 2 , Al 2 O 3 , ZrO 2 , etc.) [35][36][37][38]. It is shown that an enhanced catalytic activity of Ag-based catalysts can be achieved by using reducible metal oxides as supports and by controlling the metal-support interaction to provide synergistic effect between active sites of the support and noble metal [39].Among the supports mentioned, CeO 2 brings about high interest, since it combines exceptional redox and acid-base properties with oxygen storage, which can be controlled by proper preparation methods and treatments. Moreover, these distinctive properties of ceria cause its wide applications as a support for catalysts. For this reason, highly active and relatively inexpensive Ag/CeO 2 composite is considered promising heterogeneous catalyst for total oxidation of harmful organic compounds, including formaldehyde [40], , soot [44][45][46][47][48][49]. The Ag...

show abstract

Section: Vocs Abatementmentioning

confidence: 98%

Section: Vocs Abatementmentioning

confidence: 99%

Section: Vocs Abatementmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The catalytic oxidation is a very interesting technique for VOCs removal, especially when these latter are present in small concentrations in the gaseous streams. For this, several research groups consider the catalytic oxidation of different types of VOCs [3][4][5][6][7]. The use of CeO 2 -based materials in catalysis has attracted considerable attention in recent years, particularly in applications like environmental catalysis, where ceria has shown great potential.…”

Section: Introductionmentioning

confidence: 99%

ESR Investigation of Active Sites in Ru/CeO2 Solids

et al. 2016

Self Cite

View full text Add to dashboard Cite

Two Ru/CeO 2 catalysts with Ru loadings of 1.65 and 5 wt% were prepared by wet impregnation. The adsorption of propylene or toluene led to two different ESR signals corresponding to two different catalytic sites. These two sites are present among the well dispersed ruthenium oxide species that reduce at *74°C. One site is un-reactive unless activated to remove adsorbed water while the second site is reactive at room temperature. Both sites are easily regenerated under oxidative atmosphere at 200°C. These two sites are optimally obtained for calcination temperatures in the 500-600°C interval and a Ru loading of 1.65 wt%. For Ru5Ce, the same reactive sites are present along with agglomerated ruthenium oxide species that are less reactive in oxidation reactions. Graphical Abstract2500 2750 3000 3250 3500 3750 4000 S 3

show abstract

Highly Efficient Catalytic Soot Combustion Over Potassium‐Promoted Pine Needles‐Like CoMnO Nanoarray Monolithic Catalysts

Xu,

Zhang,

Gao

et al. 2023

ChemistrySelect

View full text Add to dashboard Cite

Herein, we report the high catalytic activity of the potassium‐promoted pine needles‐like Co2.7Mn0.3O4 nanoarray catalysts supported on the monolithic three‐dimensional macroporous (3‐DM) Ni foam substrate (xK/Co2.7Mn0.3O4−NF) by hydrothermal process and wet impregnation method for soot combustion. The 3‐DM structure of Ni foam and the macroporous nanostructure created by Co2.7Mn0.3O4 nano‐composites greatly improve the contact opportunities between soot particulates and catalysts. Our characterization results show that the addition of potassium promotes the mobility of oxygen species due to the low melting point of K‐containing compounds, and the strong interaction between potassium species and Co2.7Mn0.3O4 nano‐composites not only increases the number of active oxygen species but also improves the oxidizability of the xK/Co2.7Mn0.3O4−NF catalysts for soot oxidation. The impact of the K loadings on the catalysts displays a volcano‐type on the performance of soot oxidation and the catalyst loaded with 8 wt.% potassium species shows the highest activity with T50 at 314 °C in 600 ppm NO/O2/N2 flow, as well as high stability and water resistance. Simultaneously, the electron transfer and oxygen transfer mechanisms for soot combustion are discussed in detail. The strategy employed in this work has potential application prospects in other catalytic oxidation systems.

show abstract

Physicochemical characterization and catalytic performance of 10% Ag/CeO 2 catalysts prepared by impregnation and deposition–precipitation

Cited by 75 publications

References 73 publications

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

ESR Investigation of Active Sites in Ru/CeO2 Solids

Highly Efficient Catalytic Soot Combustion Over Potassium‐Promoted Pine Needles‐Like CoMnO Nanoarray Monolithic Catalysts

Contact Info

Product

Resources

About