Characterization of catalytically active sulfated zirconia

Zalewski, David J.; Alerasool, Saeed; Doolin, Patricia K.

doi:10.1016/s0920-5861(99)00137-6

Cited by 91 publications

(64 citation statements)

References 28 publications

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“…11e), the small spots are also visible but, as discussed with Raman data, they are attributed to W(VI) species in tetrahedral coordination. At 800ºC, the images show very small nanoparticles (few angstroms) that can be associated to polyoxotungstate clusters, 21,63,64 in agreement with Raman analysis.…”

Section: Wzusupporting

confidence: 68%

“…Moreover, to achieve a sustainability at the molecular level is also important. 21 From the different principles of Green Chemistry one of the most important is the ninth one which enunciates the use of catalysts instead of stoichiometric reagents. This would led to deployment of more sustainable processes, lowering the energy required to carry out a process, avoiding the production of waste and directing the reaction towards the desired product.…”

Section: Catalysis For Greener Processesmentioning

confidence: 99%

“…Several synthetic pathways have been proposed to synthetize W/ZrO 2 materials, such as deposition of tungsten salts over hydrous zirconia, 11,18 anion exchange, 19,20 coprecipitation, 21,22 hydrothermal synthesis 23 , sol-gel, 24 etc. In the three last methods mentioned, treatments at relatively high temperatures are required in order to activate the materials, probably because the tungsten is located inside the zirconia and it has to migrate to the surface in order to be catalytically active.…”

Section: Objectivesmentioning

confidence: 99%

“…Meanwhile with the annealing, W is expelled out of the bulk of the material, having higher concentration of W per surface area in these materials. 21 Since the crystalline phase of zirconia is very different in the materials prepared under acid (monoclinic) and basic conditions (tetragonal), the matrix seems not to play a direct role on the catalytic activity. Taking into account the previous structural analysis, we can conclude that the most active species for this reaction are the W(VI) species in tetrahedral coordination, present in the samples annealed at 500ºC, with the right Lewis acidity for this reaction.…”

mentioning

confidence: 99%

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Design of new nanomaterials for their use in catalysis and photochemistry

Gómez¹

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Section: Wzusupporting

confidence: 68%

Section: Catalysis For Greener Processesmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

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confidence: 99%

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Design of new nanomaterials for their use in catalysis and photochemistry

Gómez¹

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“…Polymerization of surface alkenes occurs, and the polymer product is converted into a carbon deposit acting as a catalyst poison in a bimolecular reaction. The accumulation of carbon deposits on the catalyst surface causes a rapid decrease in the catalytic isomerization activity 19), 20) . The time course of the pentane isomerization activity of sulfated JRC-ZRO-5 prepared by the impregnation method is shown in Fig.…”

Section: Sulfation Of Zirconia By the Sulfate Saltmentioning

confidence: 99%

酸化コバルトの酸性度に対する硫酸塩含浸法による硫酸化の影響

Matsuhashi

Taniguchi

Hirai

et al. 2013

J. Jpn. Petrol. Inst.

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To enhance the acidity of cobalt oxide, sulfation was carried out using aqueous solution of cobalt sulfate impregnated on cobalt oxide and the product calcined at high temperatures. Conventional sulfation of oxides by sulfuric acid could not avoid dissolution of cobalt oxide in the sulfuric acid. The activity of cobalt oxide for acid-catalyzed ethanol dehydration reaction was greatly enhanced by sulfation using cobalt sulfate. The activity of the prepared sulfated cobalt oxide was comparable to that of conventional SiO2 _ Al2O3 acid catalyst. The sulfated cobalt oxide did not show activity for pentane isomerization, which was catalyzed by sulfated zirconia prepared by the same methodology of sulfate salt impregnation, using zirconium sulfate solution was impregnated onto zirconia. The highest activity was obtained by heat treatment at 1073 K. This treatment temperature is the highest among solid acid catalysts reported so far.

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Oxo‐Anion Modified Oxides

Jentoft

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Classification Variety of Materials and Focus Target Properties Structure–Activity Relationships Effect of Sulfate and Other Oxo‐Anions Preparation Routes Formation of Primary Solid Formation of Pure Hydrous Zirconia Formation of Sulfate‐Containing Hydrous Zirconia Template‐Directed Formation of Primary Solid Commercially Available Precursors Anion‐Modification of Primary Solid Addition of Oxo‐Anions to Primary Solid in Liquid Medium Sulfation of Primary Solid via Gas Phase Introduction of Oxo‐Anions Using Solid Precursors Addition of Promoters (Optional) Promoters Structure–Activity Relationships Effect of Promoters Addition of Promoters Calcination Events Occurring During Calcination Effect of Bed Volume and Packing Effect of Calcination Temperature on Physical Properties Effect of Calcination Temperature on Catalytic Performance Effect of Holding Time Calcination: A Summary Sulfation of Thermally Treated Crystalline Oxides Sulfation with Aqueous Solutions (Solid–Liquid Phase) Sulfation via Gas Phase (Solid–Gas Phase) Sulfation of Zirconia using Solid Sulfate Precursors Addition of Noble Metals Activation Summary

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Characterization of catalytically active sulfated zirconia

Cited by 91 publications

References 28 publications

Design of new nanomaterials for their use in catalysis and photochemistry

Design of new nanomaterials for their use in catalysis and photochemistry

酸化コバルトの酸性度に対する硫酸塩含浸法による硫酸化の影響

Oxo‐Anion Modified Oxides

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