Introduction to Excess Adsorption

The excess adsorption isotherms showed good agreement between experiment and simulation, indicating that the model is suitable and reliable.

On the water-rich side, we confirm the existence of droplets associated to a critical point stabilized by an excess adsorption of the hydrotrope: the ultra-flexible microemulsion (UFME) domain.

This work includes the dipole-dipole interaction and structural effects along with the equation developed by Borwankar and Wasan (1988) for surface excess adsorption.

The measured supercritical methane excess adsorption isotherms show three stages: (i) a sharp increase under 6 MPa, (ii) a slow increase until reaching the maximum (V-ex(m) = 1.

The excess adsorption isotherms were measured, the adsorption volumes were determined, the adsorption isotherms of total content and the characteristic adsorption energies were calculated.

Such transition zone can negatively affect the accuracy of absolute adsorption estimation from excess adsorption, which is the mostly measured adsorption property in experiments.

The excess adsorption is directly measurable from experiments.

The excess adsorption capacity of coal was also compared with different rank parameters to understand the variation of sorption capacity with rank of coal.

Moreover, owing to the significant effect of bulk fluid density (BFD) on excess adsorption, for CH4 especially, the shapes of isobar and excess isotherm vary mightily with pressure and temperature, respectively.

Absolute and excess adsorption isotherms were determined for the adsorptives studied with operating temperatures ranging from T = 0 to 50 °C and T = 2.

The effects of grafting density, solvent molecular size, and solvent number density on the brush height, the density profiles, the relative excess adsorption, and the brush–solvent interface width are systematically analyzed.

Herein we present a manganese hydride molecular sieve that can be readily synthesized from inexpensive precursors and demonstrates a reversible excess adsorption performance of 10.

We study the effect of geometric confinement, including pore size and pore geometry, on the excess adsorption and swelling strain of shale under different temperatures.

In this study, the thermogravimetric method is used to obtain the excess adsorption/desorption of CH4 and C2H6 on two typical shale samples.

If only the excess adsorption quantity is taken, the result is a very large underestimation of the contribution of adsorbed carbon dioxide to the total content.

High excess adsorption amounts are measured for hydrogen (1.

The system demonstrated the ability to achieve excess adsorption capacities on the order of 6.

Because experimental measurement can only provide the excess adsorption, the absolute adsorption is generally converted from the excess adsorption based on the single-layer adsorption model.

At the said size, the excess adsorption capacity of methane initially decreases, after which it remains constant with an increase in the pore size.

Absolute uptake was evaluated from excess adsorption based on the following two methods: (i) the adsorbed phase volume is equal to the pore volume of the adsorbent; and (ii) the adsorbed phase volume is almost zero under low pressure and/or high temperature conditions.

We analyze the structure of the surface layers, the excess adsorption isotherms of the dumbbells and their retention in a chromatographic process.

In oil-water biphasic system, most of the extractants tend to migrate to the interface and remain an excess adsorption phenomenon, where –OH groups point towards water and are ready to capture an approaching HRE cation.

It was found that using the excess adsorption estimation, in terms of per unit surface area (PUSA), which was obtained from the free gas density calculated by using the GCMC method in a bulk simulation cell, and then derived from the free volume probed by the methane, was a reasonable way of demonstrating pore size effects on shale gas adsorption behavior.

67% on excess adsorption predictions was found, leading to an overall average error of 6.

Moreover, a coal adsorption model and an adsorption-permeability model were established, considering water content and excess adsorption under constant external stress and triaxial strain conditions.

The excess adsorption isotherms of cumene from solutions in n-octane in zeolite NaX have been measured at 303.

06 g/g of maximum methane excess adsorption.

There were obvious differences in the validity of the different adsorption models in terms of the excess adsorption capacity and absolute adsorption capacity of ScCO2.

The excess adsorption isotherm of acetonitrile (ACN) on a metal–organic framework constructed from Fe(III) and 1,3,5-benzenetricarboxylic acid (MIL-100(Fe)) in ACN/water solution was measured and converted to adsorption isotherms of ACN and water.

Moreover, compared with monovalent ions, divalent ions can reduce surface potential and lower surface charge density even further, and trivalent ions can neutralize the negatively charged ceramic surfaces and even lead to charge inversion due to excess adsorption of the cations, which ensures strong adsorption of hydrated multivalent ions on friction surfaces.

While experiments can measure excess adsorption, the absolute adsorption, which describes adsorbed gas capacity, has to be converted from the excess adsorption.

Moreover, we compare this novel model with the commonly used Langmuir and DR models, and find that all the three models can fit the excess adsorption isotherms equally well.

In this study, the modified Langmuir model considering the effects of temperature and excess adsorption was established.

Assuming that methane forms a single-layer adsorption in kerogen nanopores, a large number of approaches have been reported to convert the experimentally measured excess adsorption to the absolute adsorption.

In this study, a novel procedure is developed to quantitatively estimate the excess adsorption of gaseous hydrocarbon on shale gas reserves using direct measurements of an in-house built NMR setup.