Physisorption of Gases, With Special Reference to the Evaluation of Surface Area and Pore Size Distribution (IUPAC Technical Report)

Thommes, Matthias; Kaneko, Katsumi; Neimark, Alexander V.; Olivier, James P.; Rodriguez-Reinoso, Francisco; Rouquérol, J.; Sing, K. S. W.

doi:10.1515/iupac.87.0731

Cited by 298 publications

(363 citation statements)

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“…Furthermore, the hysteresis loop of the isotherm expanded to a wider range of relative pressures (from 0.4 to 0.9), indicating the existence of a complex system of heterogeneous mesoporosity comprised of pores of different widths. Indeed, the hysteresis loop is smooth in the adsorption branch but shows a steep desorption branch, indicating the presence of narrow pore necks and pore blocking effects in the mesoporosity (Thommes et al 2015). Despite their differences in the shape of the N 2 adsorption-desorption isotherms, both samples OG8-KO-P and OG8-KC-P displayed quite similar …”

Section: Physical Vs Chemical Activationmentioning

confidence: 97%

“…For all the burn-off degrees, the samples present type I N 2 adsorption isotherms (Thommes et al 2015) with almost negligible hysteresis loops, indicating the enlargement of the micropores after the activation and a small contribution of narrow mesopores. These are the typical porous features obtained for other carbon precursors after activation for long times (Marsh and Rodriguez-Reinoso 2006).…”

Section: Physical Vs Chemical Activationmentioning

confidence: 98%

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Designing micro- and mesoporous carbon networks by chemical activation of organic resins

et al. 2016

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Section: Physical Vs Chemical Activationmentioning

confidence: 97%

Section: Physical Vs Chemical Activationmentioning

confidence: 98%

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

et al. 2016

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“…The isotherms of all the hollow spheres were classified as being type IV isotherms according to the IUPAC classification system for physisorption isotherms, suggesting that the hollow spheres had mesoporous shell. Many different shapes of hysteresis loops have been reported, and the type of hysteresis loop observed is closely related to the particular features of the pore structure and the underlying adsorption mechanism [50,51]. The hollow spheres prepared using 40 g of PS suspension demonstrated a type H1 loop, which is associated with an ordered pore structure.…”

Section: Resultsmentioning

confidence: 96%

Influence of morphology of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane

et al. 2017

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Hollow silica-alumina composite spheres were prepared by a polystyrene (PS) template method using various amounts of PS suspension. Homogeneous hollow spheres prepared using 40 g were found to be with a diameter of about 300 nm in scanning electron microscopy, and transmission electron microscopy demonstrated their hollow sphere morphology. From the nitrogen adsorption isotherm results, the homogeneous hollow spheres prepared using 40 g of the PS suspension were found to be an ordered pore structure. The activities of the hollow spheres prepared using various amounts of the PS suspension for hydrolytic dehydrogenation of ammonia borane were compared. The results showed that 10, 7, and 6 mL of hydrogen were evolved from the aqueous ammonia borane solution in about 40 min in the presence of the hollow spheres prepared using 40, 80, and 120 g of PS suspension, respectively. The homogeneous hollow spheres with an ordered pore structure showed the highest activity among all the hollow spheres. The amount of acid sites and the coordination number of aluminum active species were characterized using neutralization titration and solid-state 27 Al magic angle spinning nuclear magnetic resonance spectroscopy. The homogeneous hollow spheres with an ordered pore structure had high amount of acid sites and 4-coordinated aluminum species. The relative proportion of 4-coordinated aluminum species was related to the dispersion of aluminum species. These results indicate that the homogeneous hollow spheres with an ordered pore structure showed the high activity because of high amount of acid sites induced by the highly dispersed aluminum species.

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“…Nitrogen adsorption-desorption isotherms for the supports are attributed to pseudo-type II isotherms with hysteresis loops of type H3 [16]. The adsorption-desorption isotherms have narrow hysteresis loop, which indicates the wide pore size distribution in the supports.…”

Section: Resultsmentioning

confidence: 97%

NiMo/USY-Alumina Catalysts with Different Zeolite Content for Vacuum Gas Oil Hydrocracking Over Stacked Beds

Дик

Доронин

Gerasimov

et al. 2017

Proceedings of the Scientific-Practical Conference "Research and Development - 2016"

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The stacked beds comprising hydrotreating catalyst as the top layer, hydrocracking catalyst based on amorphous silica-alumina as the interlayer and hydrocracking catalyst based on USY zeolite as the bottom layer were tested in hydrocracking of mixed feed containing straight-run VGO, heavy coker gas oil, aromatic extract and petrolatum. It is shown that stacked beds with developed catalysts can be successfully used both in the once-through hydrocracking to provide VGO conversion of 70-80% with middle distillates yields up to 50 wt% and in the first stage operation of two stages hydrocracker to provide 35-65% VGO

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Physisorption of Gases, With Special Reference to the Evaluation of Surface Area and Pore Size Distribution (IUPAC Technical Report)

Cited by 298 publications

References 0 publications

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

Designing micro- and mesoporous carbon networks by chemical activation of organic resins

Influence of morphology of hollow silica–alumina composite spheres on their activity for hydrolytic dehydrogenation of ammonia borane

NiMo/USY-Alumina Catalysts with Different Zeolite Content for Vacuum Gas Oil Hydrocracking Over Stacked Beds

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