Final report of CCQM-K136 measurement of porosity properties (specific adsorption, BET specific surface area, specific pore volume and pore diameter) of nanoporous Al₂O₃

Abstract

CCQM key comparison K-136 Measurement of porosity properties (specific adsorption, BET specific surface area, specific pore volume and pore diameter) of nanoporous Al2O3 has been performed by the Surface Analysis Working Group (SAWG) of the Consultative Committee for Amount of Substance (CCQM). The objective of this key comparison is to compare the equivalency of the National Metrology Institutes (NMIs) and Designated Institutes (DIs) for the measurement of specific adsorption, BET specific surface area, specific pore volume and pore diameter) of nanoporous substances (sorbents, catalytic agents, cross-linkers, zeolites, etc) used in advanced technology. In this key comparison, a commercial sorbent (aluminum oxide) was supplied as a sample. Five NMIs participated in this key comparison. All participants used a gas adsorption method, here nitrogen adsorption at 77.3 K, for analysis according to the international standards ISO 15901-2 and 9277. In this key comparison, the degrees of equivalence uncertainties for specific adsorption, BET specific surface area, specific pore volume and pore diameter was established. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

The Surface Analysis Working Group at the Consultative Committee for Amount of Substance, Metrology in Chemistry and Biology: A successful initiative by Martin Seah

“…Around 10 years later, the Russian NMI (UNIIM) knocked at SAWG's door, proposed pilot studies and key comparisons addressing the operational‐defined measurands detailed above and enough NMIs participating in SAWG expressed their interest. As the result CCQM‐P180 and CCQM‐K136 Measurement of porosity properties (specific adsorption, BET specific surface area, specific pore volume and pore diameter) of nanoporous Al 2 O 3 were organized and finished with success 23 . So Martin was obviously right with his view that SAWG is able cover this area, too.…”

“…Because at this time SAWG participants had no expertise, external experts at were organized and finished with success. 23 So Martin was obviously right with his view that SAWG is able cover this area, too. It must be mentioned here that around the same time CCQM established a "CCQM Task group on method defined measurands" to decide which of the numerous method-defined measurands will be in CCQM's scope in the future.…”