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Cited by 24,485Adsorption, diffusion, and thermodynamic properties of materialsMesoporous Materials and CatalysisAnalytical Chemistry and Chromatography

Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984)

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Sing, K. S. W.·1985·Pure and Applied Chemistry
DOI 10.1351/pac198557040603
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Abstract

micropore filling.The BET method is unlikely to yield a value of the actual surface area if the isotherm is either Type I or Type III; but both Type II and Type IV isotherms are, in general, amenable to the BET analysis, provided that the value of C is neither too low nor too high and that the BET plot is linear in the region of the isotherm containing Point B.The computation of mesopore size distribution is valid only if the isotherm is of Type IV, but in view of the complexity of most pore systems little is to be gained by the application of an elaborate method of computation.If a Type I isotherm exhibits a nearly constant adsorption at high relative pressure, the micropore volume is given by the amount adsorbed at the plateau.At present there is no reliable procedure available for the computation of the micropore size distribution from a single isotherm.A check list is recommended to assist authors in the measurement of adsorption isotherms and the presentation of the data in the primary literature. CONTENTS SECTION 1.Recent work has drawn attention to the complexity of capillary condensation in pore networks and has indicated that a pore size distribution curve derived from the desorption branch of the loop is likely to be unreliable if pore blocking effects occur.It is significant that a very steep desorption branch is usually found if the lower closure point of the loop is located at the limiting p/p° (see Section 5.3).In particular, the

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  • The adsorption capacities of UCSBC, Zn-modified and Mn-modified MCSBCs increase to a limiting value near a straight line when relative pressures (P/P0) are extremely low, meeting Type I adsorption isotherms.

    “While, the adsorption capacities of the three specimens increase to a limiting value near a straight line when the relative pressures (P/P0) are extremely low, which meets the requirements of the Type I adsorption isotherms [21]”

    From Modified coconut shell biochars (MCSBCs): Fabrication and their adsorptions for Pb(II) (2024) · cites this paper as [21]

    Section 5.2 describes Type I isotherms as approaching a limiting uptake and notes that isotherms are often linear at sufficiently low coverage. It does not examine the three named specimens, and it places the approach to the limiting value as relative pressure approaches 1, not at extremely low relative pressure. (LLM, conf=0.86)

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  • Obtained pigments have an isotherm shape corresponding to types IV and V according to the IUPAC classification.

    “Obtained pigments have an isotherm shape corresponding to types IV and V according to the IUPAC classification [63,64] (Figure 3).”

    From Studies of the Morphology of Hematite Synthesized from Waste Iron Sulfate (2024) · cites this paper as [64]

  • The I-V profile of the Mo-RF electrode shows a similar shape to commercial electrode performance in alkaline electrolysers as reported by Amitava [37].

    “The IeV profile of the Mo-RF electrode in Fig. 6 show similar shape with commercial electrode performance in alkaline electrolysers as reported by Amitava [37].”

    From Investigation of molybdenum-(resorcinol–formaldehyde) (Mo-RF) electrode for alkaline electrolyser operation (2011) · cites this paper as [37]

    Section 5.2 discusses the shapes of physisorption isotherms, not electrode I–V profiles. Searches for the Mo-RF electrode, commercial electrodes and alkaline electrolysis found no passage addressing the claimed comparison. (LLM, conf=0.78)

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  • The cell electrode voltage of the Mo-RF at 298 K is at lower ranges compared with a similar I-V profile at 348 K in that report.

    “The cell electrode voltage of the Mo-RF at 298 K in Table 1 are at lower ranges compared with similar IeV profile at 348 K in that report.”

    From Investigation of molybdenum-(resorcinol–formaldehyde) (Mo-RF) electrode for alkaline electrolyser operation (2011) · cites this paper as [37]

    The cited paper discusses gas adsorption isotherms and porosity, including temperature control during adsorption measurements (section 4.2, page not available). Searches for Mo-RF electrode voltage and I–V profiles at 298 K and 348 K found no passage addressing that comparison. (LLM, conf=0.78)

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Authors
Sing, K. S. W.
Corresponding author
Sing, K. S. W.
Venue
Pure and Applied Chemistry
Publisher
Walter de Gruyter GmbH
Published
1985-01-01
Volume
57
Issue
4
Pages
603-619
ISSN
  • 0033-4545 (ISSN-L)
  • 1365-3075
DOI
10.1351/pac198557040603
OpenAlex
W1980704616
Cited by
24,485
References
0
Citations by year
2026: 917 · 2025: 1216 · 2024: 1289 · 2023: 1250 · 2022: 1384 · 2021: 1353 · 2020: 1435 · 2019: 1478 · 2018: 1441 · 2017: 1442 · 2016: 1401 · 2015: 1319 · 2014: 1238 · 2013: 1116 · 2012: 959
FWCI
16.93
Type
journal article
Language
en
Open access
Locations
Pure and Applied Chemistry (publishedVersion)
Topics
  • Physical Sciences › Chemistry › Spectroscopy › Adsorption, diffusion, and thermodynamic properties of materials
  • Physical Sciences › Materials Science › Materials Chemistry › Mesoporous Materials and Catalysis
  • Physical Sciences › Chemistry › Spectroscopy › Analytical Chemistry and Chromatography
Keywords
physisorption, gas-solid systems, surface area determination, porosity determination, reporting recommendations, adsorption isotherms, BET method

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