Effect of the preparation method on Au/Ce-Ti-O catalysts activity for VOCs oxidation

Lamallem, M.; Ayadi, Houda El; Gennequin, Cédric; Cousin, Renaud; Siffert, Stéphane; Aïssi, Faustin; Aboukaı̈s, Antoine

doi:10.1016/j.cattod.2007.12.141

Cited by 49 publications

(33 citation statements)

References 27 publications

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“…By subtracting the theoretical consumption of gold from experimental consumption, it could be observed that the H 2 consumption of the solids increase when gold is deposited. Indeed, it is known that gold species permit the facilitation of the reduction of oxygen species from the support surface on the border with gold [4,5,10,11]. Thus, in our case, the presence of gold promotes the reduction of iron or copper species at lower temperature and enhances the redox properties of the mixed oxide support prepared by hydrotalcite precursors.…”

Section: Catalytic Activity For Toluene and Co Oxidationmentioning

confidence: 79%

“…Thus, the gold species enhanced the redox properties of the catalysts which are beneficial for the toluene total oxidation. A comparison between Au/Cu 6 Al 2 HT500 (most active sample) and some results reported in other works using gold catalysts and toluene catalytic oxidation were shown in the Table 3 The activity results (T 50 ) obtained by the Au/Cu 6 Al 2 HT500 close in comparison with best solids from literature [10,[34][35][36]. Despite the difference between operating conditions, the results of the catalysts were very attractive; indeed, the T 50 obtained for Au/Cu 6 Al 2 HT500 was better than the other solids.…”

Section: Catalytic Activity For Toluene and Co Oxidationmentioning

confidence: 96%

“…Moreover, during the past decade, many studies have established that nanosized Au-on-reducible support has a remarkable catalytic activity for many oxidation reactions [3][4][5][6][7][8][9]. In a previous work, we have shown that the gold catalyst supported on Ce-Ti mixed oxide prepared by deposition-precipitation method provides a small gold particle size and high catalytic activity in propene oxidation [10,11]. However, in the literature [12], few works have discussed the gold deposition on hydrotalcite for VOCs total oxidation.…”

Section: Open Accessmentioning

confidence: 99%

“…However, for Au/Mg 6 Al 2 HT500 and Au/Zn 6 Al 2 HT500 three absorption bands are detected at 260, 330 and 560 nm. These bands could correspond respectively to: (i) Au + cations, (ii) (Au) n δ+ small clusters and (iii) plasmon resonance of Au nanometallic particles [10,26,27]. Indeed, in gold metallic nanoparticles, the plasmon absorption arises from the collective oscillations of the free conduction band electrons that are induced by the incident electromagnetic radiation.…”

Section: Characterizations Of Gold Catalysts and Supportsmentioning

confidence: 99%

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Influence of Gold on Hydrotalcite-like Compound Catalysts for Toluene and CO Total Oxidation

et al. 2013

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X 6 Al 2 HT500 hydrotalcites, where X represents Mg, Fe, Cu or Zn were synthetized and investigated before and after gold deposition for toluene and CO total oxidation reactions. The samples have been characterized by specific areas, XRD measurements and Temperature Programmed Reduction. Concerning the toluene total oxidation, the best activity was obtained with Au/Cu 6 Al 2 HT500 catalyst with T 50 at 260 °C. However, catalytic behavior of Au/X 6 Al 2 HT500 sample in both reactions depends mainly on the nature of the support.

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Section: Catalytic Activity For Toluene and Co Oxidationmentioning

confidence: 79%

Section: Catalytic Activity For Toluene and Co Oxidationmentioning

confidence: 96%

Section: Open Accessmentioning

confidence: 99%

Section: Characterizations Of Gold Catalysts and Supportsmentioning

confidence: 99%

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Influence of Gold on Hydrotalcite-like Compound Catalysts for Toluene and CO Total Oxidation

et al. 2013

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“…This material can be used as a model catalyst for the water-gas shift reaction. Au/CeO 2 systems have been, and still are, widely used for catalytic applications such as the water gas shift reaction, CO and volatile organic compounds (VOCs) oxidation, and NO 2 reduction [33,[191][192][193][194]. Therefore, the understanding of the redox behaviour of the gold/ceria system remains a crucial step in the fundamental understanding of its catalytic activity.…”

Section: Spectromicroscopy Of Au-supported Nanoparticlesmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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Noble‐Metal‐Based Catalysts Supported on Zeolites and Macro‐Mesoporous Metal Oxide Supports for the Total Oxidation of Volatile Organic Compounds

et al. 2011

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The use of porous materials to eliminate volatile organic compounds (VOCs) has proven very effective towards achieving sustainability and environmental protection goals. The activity of zeolites and macro-mesoporous metal-oxide supports in the total oxidation of VOCs has been investigated, with and without noble-metal deposition, to develop highly active catalyst systems where the formation of by-products was minimal. The first catalysts employed were zeolites, which offered a good activity in the oxidation of VOCs, but were rapidly deactivated by coke deposition. The effects of the acido-basicity and ionic exchange of these zeolites showed that a higher basicity was related to exchanged ions with lower electronegativities, resulting in better catalytic performances in the elimination of VOCs. Following on from this work, noble metals were deposited onto macro-mesoporous metal-oxide supports to form mono and bimetallic catalysts. These were then tested in the oxidation of toluene to study their catalytic performance and their deactivation process. PdAu/TiO(2) and PdAu/TiO(2) -ZrO(2) 80/20 catalysts demonstrated the best activity and life span in the oxidation of toluene and propene and offered the lowest temperatures for a 50 % conversion of VOCs and the lowest coke content after catalytic testing. Different characterization techniques were employed to explain the changes occurring in catalyst structure during the oxidation of toluene and propene.

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Effect of the preparation method on Au/Ce-Ti-O catalysts activity for VOCs oxidation

Cited by 49 publications

References 27 publications

Influence of Gold on Hydrotalcite-like Compound Catalysts for Toluene and CO Total Oxidation

Influence of Gold on Hydrotalcite-like Compound Catalysts for Toluene and CO Total Oxidation

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Noble‐Metal‐Based Catalysts Supported on Zeolites and Macro‐Mesoporous Metal Oxide Supports for the Total Oxidation of Volatile Organic Compounds

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