IRMS-TPD of ammonia: Direct and individual measurement of Brønsted acidity in zeolites and its relationship with the catalytic cracking activity

Suzuki, Katsuki; Noda, Takayuki; Katada, Naonobu; Niwa, Miki

doi:10.1016/j.jcat.2007.05.024

Cited by 108 publications

(119 citation statements)

References 34 publications

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“…As shown in Table 1, numbers of two hydroxyls were similar, and the strengths (DH, ammonia desorption heat) were 117 and 129 kJ mol -1 for the OH bands at 3,505 and 3,622 cm -1 , respectively. The larger value of DH among them, 129 kJ mol -1 , was similar to on the b-zeolite (128 kJ mol -1 ) [17]. The energies for ammonia desorption (DU) were calculated to be 113 and 125 kJ mol -1 for the 3,505 and 3,622 cm -1 -bands, respectively.…”

Section: Ammonia Irms-tpd Measurementsmentioning

confidence: 71%

Measurements of Acidity of H-SSZ-35 by a Combined Method of IRMS-TPD Experiment and DFT Calculation

2010

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Infrared/mass spectroscopy-temperature programmed desorption of ammonia experiment on an SSZ-35 zeolite was measured to characterize the acidity. Two kinds of the Brønsted acid site were detected at 3,622 and 3,505 cm -1 ; these concentrations were nearly the same, and the strengths DH were 129 and 117 kJ mol -1 , respectively. These Brønsted hydroxyls were identified to be located in the 10-ring and 5-ring in the STF cage, respectively. These measured strengths were supported well by the DFT calculation.

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Section: Ammonia Irms-tpd Measurementsmentioning

confidence: 71%

Measurements of Acidity of H-SSZ-35 by a Combined Method of IRMS-TPD Experiment and DFT Calculation

2010

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“…2. Py-IR spectra of two characteristic absorption peaks, of which 1543 cm -1 and 1442 cm -1 , attributable to pyridine adsorbed on Brönsted acid and Lewis acid sites, respectively [11], [12].…”

Section: B Ft-ir Analysismentioning

confidence: 99%

Natural Zeolite Catalyst for Conversion of α-Pinene

Wijayati¹,

Utomo²

2016

IJCEA

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Abstract-The Natural zeolite catalyst (Si/Al = 2.5) was prepared by calsination. The physico-chemical properties were investigated by XRD, 29 Si MAS NMR, SEM, GC-MS and FT-IR spectroscopy of pyridine adsorbed. The activity of test of these catalysts has been carried out over the liquid-phase conversion of α-pinene. The converson reaction with natural zeolite, the highest selectivity of terpin compound was 59.08% with a conversion of 99.78% at 120 min.

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“…7. Py-IR spectra of two characteristic absorption peaks, of which 1543 cm -1 and 1442 cm -1 , attributable to pyridine adsorbed on Brönsted acid and Lewis acid sites, respectively [15]- [17].…”

Section: F Aciditymentioning

confidence: 99%

Characterization of ZHY and TCA/ZHY Catalysts for Hydration of α-Pinene

Wijayati¹,

Pranowo²,

Jumina³

et al. 2013

IJCEA

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Abstract-The TCA/ZHY catalyst (Si/Al = 3.25) was prepared by impregnation of the Zeolite HY (Si/Al = 2.89) with amount of an aquous solution of TCA. The physico-chemical properties were investigated by XRD, 29 Si and 27 Al MAS NMR, BET, SEM, NH 3 -TPD and FT-IR spectroscopy of pyridine adsorbed. The activity of catalytic of these catalysts has been carried out over the liquid-phase hydration of α-pinene to give α-terpineol as a major product and hydrocarbon as a minor products.Index Terms-TCA/ZHY, α-pinene, α terpineol, hydration.

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IRMS-TPD of ammonia: Direct and individual measurement of Brønsted acidity in zeolites and its relationship with the catalytic cracking activity

Cited by 108 publications

References 34 publications

Measurements of Acidity of H-SSZ-35 by a Combined Method of IRMS-TPD Experiment and DFT Calculation

Measurements of Acidity of H-SSZ-35 by a Combined Method of IRMS-TPD Experiment and DFT Calculation

Natural Zeolite Catalyst for Conversion of α-Pinene

Characterization of ZHY and TCA/ZHY Catalysts for Hydration of α-Pinene

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