Influence of Preparation Methods on the Performance of Metal Phosphate-Supported Gold Catalysts in CO Oxidation

Ma, Zhen; Yin, Hongfeng; Dai, Sheng

doi:10.1007/s10562-010-0384-2

Cited by 16 publications

(8 citation statements)

References 51 publications

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“…In the literature, some metal carbonates, phosphates, and sulfates have been used as supports to load metals [2]. From the examples on the catalytic applications of metal phosphate-based catalysts cited in the Introduction section [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,…”

Section: Resultsmentioning

confidence: 99%

“…Miura and co-workers [ 30 ] demonstrated that Pd/AlPO 4 showed high activity in the hydrogenation of naphthalene in the presence of CO. Takita and co-workers [ 31 ] employed Pt/AlPO 4 and Pt/CePO 4 -AlPO 4 for the hydrodechlorination of CHF 2 CClF 2 . More recently, Dai and co-workers [ 32 , 33 , 34 ] developed a series of metal phosphate-supported Au (denoted as Au/M-P-O, M = Fe, Co, Y, La, Pr, Nd, Sm, Eu, Ho, Er) catalysts and tested their performance in CO oxidation. Among them, Au/La-P-O and Au/Fe-P-O are representative catalysts, and the nature of active sites and reaction mechanisms were studied in detail [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

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Metal Phosphate-Supported Pt Catalysts for CO Oxidation

et al. 2014

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Oxides (such as SiO2, TiO2, ZrO2, Al2O3, Fe2O3, CeO2) have often been used to prepare supported Pt catalysts for CO oxidation and other reactions, whereas metal phosphate-supported Pt catalysts for CO oxidation were rarely reported. Metal phosphates are a family of metal salts with high thermal stability and acid-base properties. Hydroxyapatite (Ca10(PO4)6(OH)2, denoted as Ca-P-O here) also has rich hydroxyls. Here we report a series of metal phosphate-supported Pt (Pt/M-P-O, M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts for CO oxidation. Pt/Ca-P-O shows the highest activity. Relevant characterization was conducted using N2 adsorption-desorption, inductively coupled plasma (ICP) atomic emission spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), CO2 temperature-programmed desorption (CO2-TPD), X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction (H2-TPR). This work furnishes a new catalyst system for CO oxidation and other possible reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

et al. 2014

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“…These catalysts were pretreated in O 2 -He at 300 or 500 °C because we found that as-synthesized Au/La-P-O (without any thermal pretreatment) was not active [86] when the reaction temperature was below 200 °C , due to the influence of the capping agents, whereas the pretreatment at 300-500 °C was sufficient to activate the Au/La-P-O catalyst. After testing all of these Au/M-P-O samples, we found that only Au/La-P-O was active for CO oxidation below room temperature [94]. Therefore, the activities of supported gold nanoparticles are not only related to the size of gold nanoparticles, but also influenced by the support and the preparation method.…”

Section: Au/metal Phosphatesmentioning

confidence: 97%

Development of novel supported gold catalysts: A materials perspective

2010

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Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

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“…For Ag/Mg/TiO 2 , there is a combination of a curve with a maximum (at low temperatures) and an S-shaped curve (at high temperatures). This effect, caused by both supported silver [2,16] and gold [37,38,39,40,41] catalysts, is explained in the literature as due to the activity of small clusters and larger particles, at low temperatures and at high temperatures, respectively. It can be seen that light-off curves for as-prepared Ag/Ce/TiO 2 and Ag/Fe/TiO 2 samples are similar; consequently, the contents of active species in them were comparable (Figure 1).…”

Section: Resultsmentioning

confidence: 98%

Identification of Subnanometric Ag Species, Their Interaction with Supports and Role in Catalytic CO Oxidation

et al. 2016

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Abstract:The nature and size of the real active species of nanoparticulated metal supported catalysts is still an unresolved question. The technique of choice to measure particle sizes at the nanoscale, HRTEM, has a practical limit of 1 nm. This work is aimed to identify the catalytic role of subnanometer species and methods to detect and characterize them. In this frame, we investigated the sensitivity to redox pretreatments of Ag/Fe/TiO 2 , Ag/Mg/TiO 2 and Ag/Ce/TiO 2 catalysts in CO oxidation. The joint application of HRTEM, SR-XRD, DRS, XPS, EXAFS and XANES methods indicated that most of the silver in all samples is in the form of Ag species with size <1 nm. The differences in catalytic properties and sensitivity to pretreatments, observed for the studied Ag catalysts, could not be explained taking into account only the Ag particles whose size distribution is measured by HRTEM, but may be explained by the presence of the subnanometer Ag species, undetectable by HRTEM, and their interaction with supports. This result highlights their role as active species and the need to take them into account to understand integrally the catalysis by supported nanometals.

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Influence of Preparation Methods on the Performance of Metal Phosphate-Supported Gold Catalysts in CO Oxidation

Cited by 16 publications

References 51 publications

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

Metal Phosphate-Supported Pt Catalysts for CO Oxidation

Development of novel supported gold catalysts: A materials perspective

Identification of Subnanometric Ag Species, Their Interaction with Supports and Role in Catalytic CO Oxidation

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