2001
DOI: 10.1006/jcat.2000.3095
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New Methods for Quantitative Determination of Brønsted Acid Sites on Solid Acids: Applicability and Limits for Al2O3-Promoted SO42−/ZrO2 Catalysts

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Cited by 38 publications
(28 citation statements)
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“…However, it was often in powdered form with very poor mechanical properties; therefore, alumina must be added as a binder in industrial catalyst preparation. It was then discovered that introduction of alumina could markedly improve the catalyst performance [4][5][6]. Moreover, it is reported that promotion of platinum to SZ in PSZ preparation would not only inhibit the formation of coke improving the stability but also results in high steady yields of isomers in n-C 5 /n-C 6 hydroisomerization [7,8].…”
Section: Introductionmentioning
confidence: 99%
“…However, it was often in powdered form with very poor mechanical properties; therefore, alumina must be added as a binder in industrial catalyst preparation. It was then discovered that introduction of alumina could markedly improve the catalyst performance [4][5][6]. Moreover, it is reported that promotion of platinum to SZ in PSZ preparation would not only inhibit the formation of coke improving the stability but also results in high steady yields of isomers in n-C 5 /n-C 6 hydroisomerization [7,8].…”
Section: Introductionmentioning
confidence: 99%
“…Silicon has not been used as a minority species in SZ, i.e. as a promoter, while aluminum-promoted SZ [63] was tested in n-butane [64][65][66][67][68][69], isobutane [70,71], and n-pentane isomerization [64], and benzoylation of toluene with benzoyl chloride [64,72].…”
Section: Introductionmentioning
confidence: 99%
“…Neither the b-methylene protons nor the more accessible terminal methyl group were involved in the H/D exchange. Again, as a result of the isotope effect on chemical shifts, [47][48][49] various isotopologues are observed in the early stages of the exchange process: Three peaks assigned to CDH 2 , CD 2 H, and CD 3 for the methyl group and two peaks assigned to CDH and CD 2 for the a-methylene group (Figure 2b).…”
Section: Resultsmentioning
confidence: 98%
“…150 mL, 1.1 mmol in the case of 2MP, 145 mL, 1.1 mmol of 3MP, 143 mL, 1.1 mmol of n-hexane, 34 mL (gas), 1.5 mmol of isobutene, and 6 % butane in N 2 ) was introduced into the recirculation loop. The amount of protons provided by the hydrocarbon was in large excess compared with the acid deuterons because the concentrations of the D 2 O-exchanged acid sites at 200 8C, as determined by the NMR method, [49,50] were found to be 4.4, 1.9, and 1.0 mmol H + g À1 for USY, MOR, and ZSM5, respectively. The gas-phase mixture (hydrocarbon and nitrogen) was circulated by a membrane pump at a recirculation rate of 20 mL min…”
Section: Full Papermentioning
confidence: 97%
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