Spontaneous Monolayer Dispersion of Oxides and Salts onto Surfaces of Supports: Applications to Heterogeneous Catalysis

Xie, Yongbing; Tang, Youqi

doi:10.1016/s0360-0564(08)60362-4

Cited by 517 publications

(186 citation statements)

References 29 publications

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“…As well documented in the literature [32][33][34][35], the interaction between the supported species and a support surface from the hydrous state yields changes in support properties and in supported species. During thermal treatment, adsorbed species interacting with the support surface hinder crystallization and sintering processes favoring the dispersion of active species.…”

Section: Introductionmentioning

confidence: 63%

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Total Oxidation of Naphthalene with Zirconia-Supported Cobalt, Copper and Nickel Catalysts

et al. 2017

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ZrO 2 ·nH 2 O (hydrogel) impregnated with transition metals (Cu, Co, and Ni) was studied in this work as a precursor for the synthesis of CuO/ZrO 2 (CuZ), CoO x /ZrO 2 (CoZ), and NiO/ZrO 2 (NiZ) catalysts, employed in the naphthalene oxidation reaction. Fresh and catalytically used materials were characterized by different physicochemical techniques, to compare the bulk and surface behavior, with particular attention to the effect of the supported metal species' properties on the catalytic activity. Techniques such as X-ray diffraction (XRD), temperature programmed reduction (TPR), differential scanning calorimetry (DSC), Brunauer-Emmett-Teller (BET) surface area analyzer, diffuse reflectance spectroscopy (DRS UV-vis), and Raman spectroscopy, allow for establishing structural and textural aspects of the support, as well as the surface coordination and the accessibility of supported species. Results were in agreement with the CuZ > CoZ > NiZ sequence for the activity in naphthalene oxidation reaction. Electronic properties, ionic sizes, oxide phase deposition on the support surface, reducibility, metal-support interaction, and local site symmetry of metals seem to be decisive factors for the catalytic interaction with the gaseous phase.

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Section: Introductionmentioning

confidence: 63%

“…Depending on the interaction strength, supported species may end up as dispersed or separate phase (crystalline or amorphous) or dissolved in the support to give a solid solution [32].…”

Section: Introductionmentioning

confidence: 99%

Total Oxidation of Naphthalene with Zirconia-Supported Cobalt, Copper and Nickel Catalysts

et al. 2017

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“…The mixed metal oxides can disperse well on the alumina to form a monolayer or submonolayer stable form. 13 Figure 3b shows the XRPD pattern of CuO-ZnO/ Al 2 O 3 adsorbents with different weight percentages of active components. The XRPD peak intensities of CuO crystallite appear to be present in the adsorbent with an active component loading Ͼ40%.…”

Section: Resultsmentioning

confidence: 99%

“…13 Based on the published result, the content of the active component was first chosen as 40 wt% (see Table 1). To further investigate the effect of the active component content on the adsorption capacity, several adsorbent batches of different weight percentages with a fixed CuO-ZnO ratio (2:1) were used (refer to Table 2).…”

Section: Experimental Work Sample Preparationmentioning

confidence: 99%

Silane Removal at Ambient Temperature by Using Alumina-Supported Metal Oxide Adsorbents

Hsu

Tsai

Chiang

et al. 2007

Journal of the Air & Waste Management Association

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Copper, zinc, and cerium oxide adsorbents supported on alumina were used to remove silane gas (SiH 4 ). The adsorbents were prepared using a coprecipitation method and characterized by the inductively coupled plasma mass spectrometry, X-ray powder diffractometer, and Brunauer-Emmett-Teller method (BET). The silane removal efficiency and adsorption capacity of the adsorbents were investigated in this study. Test results showed that the adsorbents containing active species had a removal efficiency Ͼ99.9% for SiH 4 before breakthrough. Adsorbents containing mixed oxides (CuO-CeO 2 / Al 2 O 3 and CuO-ZnO/Al 2 O 3 ), which showed well-dispersed active species and high BET surface areas, had a greater adsorption capacity than the adsorbents containing single metal oxide. However, when the CuO-ZnO/ Al 2 O 3 adsorbents contain Ͼ40 wt% of active metal oxides, the increase of active species lowered the BET surface area leading to a decrease of the adsorption capacity. Additionally, when the content of the active metal oxides was between 20% and 40%, the CuO-ZnO/Al 2 O 3 adsorbents demonstrated higher adsorption capacity.

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“…Its activity is closely related to the accessible active surface sites and the pore structure of the catalyst [10]- [18]. We have studied the naphthalene methylation reaction on four kinds of PdO modified zeolitic materials: Hβ, SAPO-11, HUSY and HZSM-5, with typical pore shapes.…”

Section: Activity and Stabilitymentioning

confidence: 99%

Improved Stability and Shape Selectivity of 2,6-Dimethylnaphthalene by Methylation of Naphthalene with Methanol on Modified Zeolites

Zhang¹,

Feng²,

Lyu³

et al. 2014

MRC

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Spontaneous Monolayer Dispersion of Oxides and Salts onto Surfaces of Supports: Applications to Heterogeneous Catalysis

Cited by 517 publications

References 29 publications

Total Oxidation of Naphthalene with Zirconia-Supported Cobalt, Copper and Nickel Catalysts

Total Oxidation of Naphthalene with Zirconia-Supported Cobalt, Copper and Nickel Catalysts

Silane Removal at Ambient Temperature by Using Alumina-Supported Metal Oxide Adsorbents

Improved Stability and Shape Selectivity of 2,6-Dimethylnaphthalene by Methylation of Naphthalene with Methanol on Modified Zeolites

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