4.23 Sulfated Zirconia for n-Butane Isomerization Experimental and Theoretical Approaches

Babou, F.; Bigot, Bernard; Coudurier, G.; Sautet, P.; Védrine, J.C.

doi:10.1016/s0167-2991(08)61868-6

Cited by 23 publications

(17 citation statements)

References 16 publications

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“…Water has both beneficial and adverse effects on the acidity and activity of sulphated zirconia catalysts. [9][10][11][12][13] Water is adsorbed on the coordinatively unsaturated Lewis acid sites of the catalyst. 10,11 It is, therefore, interesting to study TPD of water (which has high stability at elevated temperatures) on sulphated zirconia for measuring its strong acidity.…”

Section: Somentioning

confidence: 99%

Temperature-programmed desorption of water and ammonia on sulphated zirconia catalysts for measuring their strong acidity and acidity distribution

Choudhary

Karkamkar

2003

J Chem Sci

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Section: Somentioning

confidence: 99%

Temperature-programmed desorption of water and ammonia on sulphated zirconia catalysts for measuring their strong acidity and acidity distribution

Choudhary

Karkamkar

2003

J Chem Sci

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“…Neither the anhydrous bulk zirconium sulfate nor the silica-supported, sulfated zirconia were active in the addition of acetic acid (4) to camphene (5). The lack of activity is due to the fact that addition of acetic anhydride removes water completely from the reactants.…”

Section: Liquid-phase Hydro-acyloxy Additionmentioning

confidence: 99%

“…The presence of catalytically active Lewis acid sites in sulfated zirconia catalysts is much debated [1][2][3][4][5]. The conventional preparation of sulfated zirconia catalysts involves reaction of freshly precipitated zirconium hydroxide with diluted sulfuric acid or impregnation of zirconium hydroxide with sulfuric acid or ammonium sulfate [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The silica-supported zirconium sulfate resulted from deposition-precipitation of zirconium hydroxide on silica, calcination at 723 K and subsequent reaction with gaseous sulfur trioxide. The catalytic activity of the sulfated zirconia's was measured in the gas-phase trans-alkylation of benzene (1) with diethylbenzene (2) to ethylbenzene (3, reaction 1) [8,9] and the liquid-phase hydroacyloxy-addition reaction of acetic acid (4) and camphene (5) to isobornyl acetate (6, reaction 2) [8,10]. With the trans-alkylation we used an amorphous silica-alumina catalyst as a reference.…”

Section: Introductionmentioning

confidence: 99%

“…)], the other in a similar way but with calcined zirconia [H 2 SO 4 /ZrO 2 (Gimex)] [8]. It is interesting that it has been concluded from their infrared spectra that addition of water vapor leads to formation of sulfuric acid [5]. As the volatility of sulfuric acid and its constituents is higher than that of metal sulfates, the transport of water and sulfur oxides out of the porous structure of the zirconia is important.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic activity of bulk and supported sulfated zirconia

Dijs¹,

Jenneskens²,

Geus³

2000

Studies in Surface Science and Catalysis

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SummaryTo assess whether Lewis acid sites are present on zirconium sulfate, we prepared water-free bulk zirconium sulfate. Furthermore, a water-free silica-supported zirconium sulfate catalyst was prepared by deposition-precipitation of zirconia on silica and subsequent gas-phase reaction with SO 3 . The activity of these catalysts was compared with that of two conventionally prepared sulfated zirconia catalysts.The different catalysts were extensively characterized. XPS indicated that the conventionally prepared sulfated zirconia catalysts contained sulfuric acid. The activity of the catalysts was determined with the gas-phase trans-alkylation of diethylbenzene with benzene and the solvent-free liquid-phase addition of acetic acid to camphene.Both water-free zirconium sulfate catalysts did not exhibit a significant activity; Lewis acid sites are therefore not active in these sulfated zirconia catalysts. Upon exposure to water vapor the initially water-free catalysts were active. The stability of the conventional sulfated zirconia catalysts appeared to be determined in the gas-phase by the volatilization of sulfuric acid. As a result, a highly porous catalyst was more effective than a catalyst based on zirconia of a relatively low porosity. With liquidphase reactions extraction of sulfuric acid proceeds leading to an acid liquid, which is catalytically active also after separation of the solid catalyst from the reaction mixture.

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The effect of water on the acidity of TiO2 and sulfated titania

Kulkarni

Muggli

2006

Applied Catalysis A: General

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4.23 Sulfated Zirconia for n-Butane Isomerization Experimental and Theoretical Approaches

Cited by 23 publications

References 16 publications

Temperature-programmed desorption of water and ammonia on sulphated zirconia catalysts for measuring their strong acidity and acidity distribution

Temperature-programmed desorption of water and ammonia on sulphated zirconia catalysts for measuring their strong acidity and acidity distribution

Catalytic activity of bulk and supported sulfated zirconia

The effect of water on the acidity of TiO2 and sulfated titania

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