Disclosing the True Critical Point of Fluids Confined in Nanopores
Ephraim Kakra Owusu-Banahene, Sugata P. Tan, Morteza Dejam, Hertanto Adidharma
TL;DR
This paper compares two methods to determine the critical point of fluids in nanopores and identifies which one gives the true critical point.
Contribution
The study is the first to compare two methods on the same system to determine the true critical point of confined fluids.
Findings
The DSC method identifies the true critical point where no heat is released.
The Peng–Robinson equation of state accurately models the capillary-condensation curve using the true PCP.
Abstract
Two methods for determining the pore critical point (PCP), i.e., the critical point of confined fluid, are currently available in the literature. The better-known method is based on the analysis of data obtained from adsorption isotherms, while the newer method analyzes the heat of capillary condensation data obtained from differential scanning calorimetry (DSC). For the first time, these two methods are implemented on the same confined system for comparison to explore which method provides the true PCP. While the heat released at the PCP derived from adsorption isotherms is measurably nonzero, implying that a phase transition still occurs in the pores, no heat is released at the PCP derived from the DSC measurements, which indicates the true critical point of the first-order phase transition. With this true PCP, the Peng–Robinson cubic equation of state (EOS), without any modification,…
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Taxonomy
TopicsPhase Equilibria and Thermodynamics · Nanopore and Nanochannel Transport Studies · Mesoporous Materials and Catalysis