Effects of Water on the Performance of Sulfated Zirconia Catalysts for Butane Isomerization

Kobe, J.M.; González, M. R.; Fogash, K.B.; Dumesic, James A.

doi:10.1006/jcat.1996.0402

Cited by 40 publications

(28 citation statements)

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“…Several authors showed that a particular amount of water is necessary for good performance. The optimal amount is debated; Kobe et al [44] proposed 75 µmol g -1 whereas Song and Kydd [23] reported 200 µmol g -1 . Morterra et al [45] showed that the number of Brønsted sites decreases with progressing dehydration, with Lewis acid sites formed in turn.…”

Section: Effect Of Activationmentioning

confidence: 99%

Characterization of catalysts in their active state by adsorption microcalorimetry: Experimental design and application to sulfated zirconia

Wrabetz

Yang

Tzolova-Müller

et al. 2010

Journal of Catalysis

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A method to characterize the surface sites of catalysts in their active state by adsorption microcalorimetry was developed. A calorimeter cell was used as a flow-type reactor, and the skeletal isomerization of n-butane (1 kPa) at 378 K and atmospheric pressure proceeded at comparable rates and with the same states of induction period, maximum and deactivation phase as in a tubular reactor. The reaction was run for selected times on stream and after removal of weakly adsorbed species, n-butane or isobutane were adsorbed at 313 K. The surface of activated sulfated zirconia was characterized by at least two different sites for n-butane adsorption, a small group of sites (about 20 µmol g -1 ) that yielded heats of 5060 kJ mol -1 and sites that were populated at higher pressures (above about 5 hPa n-butane) and yielded heats of about 40 kJ mol -1 . The strongly interacting sites disappear during the induction period and are proposed to be the sites where the isomerization reaction is initiated.

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Section: Effect Of Activationmentioning

confidence: 99%

Characterization of catalysts in their active state by adsorption microcalorimetry: Experimental design and application to sulfated zirconia

Wrabetz

Yang

Tzolova-Müller

et al. 2010

Journal of Catalysis

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show abstract

“…As proposed by Kobe at al. 28 for the isomerization of butane over sulfated zirconia catalysts, water may lower the energy barrier through which the catalytic cycle must proceed. Excessive catalyst hydration leads to the suppression of the catalytic activity very probably because of an extensive hydrogen bonding at the active sites.…”

Section: Resultsmentioning

confidence: 99%

Isomerization of cyclohexane and hexane over silica- embedded triflate derivative catalysts

Gagea¹,

Parvulescu²,

Parvulescu³

et al. 2001

Arkivoc

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“…[40] In line with those findings, Kobe et al reported that the addition of 75 mmol g À1 of water to a sulfated zirconia sample dehydrated at 500 8C largely restored its high catalytic activity in n-butane isomerization. [41] On the other hand, excessive catalyst hydration led to poor catalytic performance by causing extensive hydrogen bonding at the active sites. The last finding confirmed several previous data reporting the poisoning of the active sites by water.…”

Section: Discussionmentioning

confidence: 99%

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

Machynskyy¹,

Kemnitz²,

Karpiński³

2014

ChemCatChem

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Experimental evidence for Pd‐based structure modification of electrocatalysts with hydrogen during their chemical synthesis is still missing. Therefore, in situ X‐ray diffraction (XRD) techniques were as used to investigate hydrogen insertion into the lattice of Pd nanomaterials during their preparation. It was shown that the use of NaBH4 as reducing agent led to PdHx whereas L‐ascorbic acid gave Pd nanoparticles. The subsequent influence of hydrogen insertion on the catalytic properties of Pd nanostructures was demonstrated by using carbon monoxide and glucose as probing molecules. High active surface areas and catalytic activities were found for the unmodified Pd nanostructures through electrochemical studies. Notably, the reducing agent has a significant effect on the size distribution of the nanoparticles. Its use can precisely and effectively tune their catalytic properties. Consequently, the remarkable behavior uncovered herein provides new strategic routes that can be used for the preparation of Pd‐based nanomaterials.

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Effects of Water on the Performance of Sulfated Zirconia Catalysts for Butane Isomerization

Cited by 40 publications

References 0 publications

Characterization of catalysts in their active state by adsorption microcalorimetry: Experimental design and application to sulfated zirconia

Characterization of catalysts in their active state by adsorption microcalorimetry: Experimental design and application to sulfated zirconia

Isomerization of cyclohexane and hexane over silica- embedded triflate derivative catalysts

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

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