Adsorption of hydrocarbons on a carbon molecular sieve

Nakahara, Tomoko; Hirata, Mitsuho; Omori, Toshiaki

doi:10.1021/je60063a018

Cited by 47 publications

(18 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MSC5A is a carbon molecular sieve with specific surface area of 650 m 2 •g −1 and a specific pore volume of 0.56 cm 3 •g −1 . 50 Therefore, assuming a cylindrical geometry, the pore radius of MSC5A was considered to be 1.72 nm. 25 Figure 3 shows the comparison between our calculations using SAFT-VR Mie combined with the empirical expression for Φ (eq 14) as well as with the theoretical expression for Φ (eq 23) and the experimental data obtained in the literature 50 for the adsorption of methane in a carbon molecular sieve (MSC5A) at 303.15 K. The results show excellent agreement between our calculations and the experimental data.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Statistical Mechanical Model for Adsorption Coupled with SAFT-VR Mie Equation of State

2017

View full text Add to dashboard Cite

We extend the SAFT-VR Mie equation of state to calculate adsorption isotherms by considering explicitly the residual energy due to the confinement effect. Assuming a square-well potential for the fluid-solid interactions, the structure imposed by the fluid-solid interface is calculated using two different approaches: an empirical expression proposed by Travalloni et al. ( Chem. Eng. Sci. 65 , 3088 - 3099 , 2010 ), and a new theoretical expression derived by applying the mean value theorem. Adopting the SAFT-VR Mie ( Lafitte et al. J. Chem. Phys. , 139 , 154504 , 2013 ) equation of state to describe the fluid-fluid interactions, and solving the phase equilibrium criteria, we calculate adsorption isotherms for light hydrocarbons adsorbed in a carbon molecular sieve and for carbon dioxide, nitrogen, and water adsorbed in a zeolite. Good results are obtained from the model using either approach. Nonetheless, the theoretical expression seems to correlate better the experimental data than the empirical one, possibly implying that a more reliable way to describe the structure ensures a better description of the thermodynamic behavior.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Statistical Mechanical Model for Adsorption Coupled with SAFT-VR Mie Equation of State

2017

View full text Add to dashboard Cite

show abstract

“…This is an increasingly popular subject of computational simulations of varying degree of sophistication [175][176][177][178][179]. Often painstaking evaluation of the degree of pore accessibility using molecular probes of judiciously selected sizes has been useful both at a fundamental level [162,[180][181][182][183][184][185][186][187][188][189][190][191][192][193] and for the potential commercialization of carbon molecular sieves [194][195][196][197][198][199][200][201][202][203][204][205][206][207][208][209][210].…”

Section: Surface Propertiesmentioning

confidence: 99%

Physicochemical Properties of Carbon Materials: A Brief Overview

Radović

2008

Carbon Materials for Catalysis

View full text Add to dashboard Cite

“…The measurement apparatus is called a static gravimetric adsorption apparatus [33]. It consists of a microbalance on which a small adsorbent sample (-20 mg).…”

Section: Adsorption Isotherms On Ccdsmentioning

confidence: 99%

Combustion Chamber Deposit Effects on Hydrocarbon Emissions from a Spark-Ignition Engine

Haidar

Heywood

1997

SAE Technical Paper Series

View full text Add to dashboard Cite

Data on the effect of combustion chamber deposits (CCD) on the HC emissions from spark-ignition engines has been scarce and contradictory. With more stringent emissions standards set by the EPA taking effect, quantifying the effect of CCDs on HC emissions from a modem spark-ignition engine is of significant importance. The objectives of this work can be summarized in three points: quantify the contribution of CCDs to the total engine-out HC emissions; identify the effect of combustion chamber deposits on the HC emissions from a matrix of single-component fuels; develop a model to describe the mechanism(s) by which CCDs lead to an increase to HC emissions. The engine is run for periods ranging from 100 to 25 hours, on a deposit build-up cycle. During deposit accumulation, the HC emissions are continuously measured at several operating conditions using an additized, specially-designed fuel that promotes CCD accumulation. In addition, HC emission measurements are taken using isooctane, benzene, toluene and xylene with the deposited and then clean engine.The experimental results show that CCDs contribute to about 15% of the total engine-out HC emissions from the deposit build-up fuel and from the four single-component fuels. Starting from a clean-engine level, the HC emissions increase rapidly in the first 10 hours of deposit accumulation and stabilize after about 25 hours. The deposits continue to grow well beyond the point where the HC emissions stabilize. After engine disassembly and CCD removal, the HC emissions drop back to their clean-engine levels, confirming the effect of CCDs on the HC emissions. The data shows no significant difference in the effect of CCDs on the HC emission increase among the four single-component fuels. The deposit pore size distribution is quantified using mercury porosimetry measurements. Using these measurements, it is concluded that the filling of deposit pores with fuel-air mixture at uniform pressure(deposit crevice mechanism) is the dominant mechanism. Accounting for oxidation of some of the fuel stored in the cylinder head and exhaust ports, the model overpredicts the experimental data by about 50%. Thesis Advisor John Heywood Professor, Mechanical Engineering ACKNOWLEDGEMENTS

show abstract

Adsorption of hydrocarbons on a carbon molecular sieve

Cited by 47 publications

References 2 publications

Statistical Mechanical Model for Adsorption Coupled with SAFT-VR Mie Equation of State

Statistical Mechanical Model for Adsorption Coupled with SAFT-VR Mie Equation of State

Physicochemical Properties of Carbon Materials: A Brief Overview

Combustion Chamber Deposit Effects on Hydrocarbon Emissions from a Spark-Ignition Engine

Contact Info

Product

Resources

About