Competitive adsorption behaviors of carbon dioxide and n-dodecane mixtures in 13X molecular sieve

Abstract A gas-solid chromatographic method is described for the separation and determination of 5 medicinal gases at ambient temperature, using 2 gas chromatographic columns, Porapak Q and Molecular Sieve 13X, operated in series with a 6-port thermal conductivity detector and I recorder. An electronic digital integrator is used for calculating peak areas. Data on retention time, linearity, reproducibility of injection, and comparison with absorption methods are presented. Analytical results for oxygen, nitrogen, carbon dioxide, ethylene, and nitrous oxide are attainable within 1.0% without the use of an internal standard.

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ChemInform Abstract: ON THE MECHANISM OF CARBON MONOXIDE AND CARBON DIOXIDE METHANATION OVER RUTHENIUM/MOLECULAR SIEVE CATALYST

Chemischer Informationsdienst ◽

10.1002/chin.198004157 ◽

1980 ◽

Vol 11 (4) ◽

Author(s):

N. M. GUPTA ◽

V. S. KAMBLE ◽

K. A. RAO ◽

R. M. IYER

Keyword(s):

Carbon Dioxide ◽

Carbon Monoxide ◽

Molecular Sieve ◽

Carbon Dioxide Methanation

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Advances in the Radiocarbon Analysis of Carbon dioxide at the NERC Radiocarbon Facility (East Kilbride) using Molecular sieve Cartridges

Radiocarbon ◽

10.1017/rdc.2019.86 ◽

2019 ◽

Vol 61 (6) ◽

pp. 1855-1865

Author(s):

M H Garnett ◽

Josephine-Anne Newton ◽

P L Ascough

Keyword(s):

Carbon Dioxide ◽

Molecular Sieves ◽

Molecular Sieve ◽

Content Standards ◽

Sieve Methods ◽

Scientific Investigations ◽

Consensus Values ◽

Anthropogenic Processes ◽

Automated Procedures ◽

Quality Assurance Standards

ABSTRACTRadiocarbon (14C) analysis of carbon dioxide (CO2) provides unique information on the age, turnover and source of this important greenhouse gas, raising the prospect of novel scientific investigations into a range of natural and anthropogenic processes. To achieve these measurements, cartridges containing zeolite molecular sieves are a reliable and convenient method for collecting CO2 samples. At the NERC Radiocarbon Facility (East Kilbride) we have been refining our molecular sieve methods for over twenty years to achieve high-quality, reproducible and precise measurements. At the same time, we have been developing novel field sampling methods to expand the possibilities in collecting gas from the atmosphere, soil respiration and aquatic environments. Here, we present our latest improvements to cartridge design and procedures. We provide the results of tests used to verify the methods using known 14C content standards, demonstrating reliability for sample volumes of 3 mL CO2 (STP; 1.6 mg C) collected in cartridges that had been prepared at least three months earlier. We also report the results of quality assurance standards processed over the last two years, with results for 22 out of 23 international 14C standards being within measurement uncertainty of consensus values. We describe our latest automated procedures for the preparation of cartridges prior to use.

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Kinetic separation of methane/carbon dioxide by molecular sieve carbons

Separation Science and Technology ◽

10.1081/ss-120004450 ◽

2002 ◽

Vol 37 (11) ◽

pp. 2505-2528 ◽

Cited By ~ 34

Author(s):

Ambalavanan Jayaraman ◽

Andrew S. Chiao ◽

Joel Padin ◽

Ralph T. Yang ◽

Curtis L. Munson

Keyword(s):

Carbon Dioxide ◽

Molecular Sieve ◽

Methane Carbon ◽

Kinetic Separation

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Experimental Study on Adsorption of Carbon Dioxide on 13X Molecular Sieve for Coolant Helium Purification

Volume 2: Plant Systems, Construction, Structures and Components; Next Generation Reactors and Advanced Reactors ◽

10.1115/icone21-15362 ◽

2013 ◽

Author(s):

Hua Chang ◽

Tao Ma ◽

Ling Liu ◽

Hua-Qiang Yin ◽

Xue-Dong He

Keyword(s):

Carbon Dioxide ◽

Adsorption Capacity ◽

Molecular Sieve ◽

Fixed Bed ◽

Breakthrough Curves ◽

Carbon Dioxide Partial Pressure ◽

Zone Model ◽

Low Carbon ◽

Enthalpy Of Adsorption ◽

Operation Conditions

The adsorption capability of carbon dioxide on 13X molecular sieve (13XMS) was investigated in a fixed-bed apparatus with two-road gas mixing system by dynamic column breakthrough method with helium as carrier gas at helium purification conditions of high-temperature gas-cooled reactor (HTGR). Experiments were performed at temperatures of 5°C ∼35 °C and low carbon dioxide partial pressure range of 10∼150Pa. By analyzing the breakthrough curve, both equilibrium adsorption capacity and kinetic adsorption capacity at breakthrough point were determined. Based on mass-transfer zone model, the experimental breakthrough curves at different operation conditions were analyzed. The carbon dioxide isotherm on 13XMS was fitted well by Langmuir model and the enthalpy of adsorption of carbon dioxide was estimated.

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Molecular dynamics investigations of liquid–vapor interaction and adsorption of formaldehyde, oxocarbons, and water in graphitic slit pores

Physical Chemistry Chemical Physics ◽

10.1039/c4cp01922a ◽

2014 ◽

Vol 16 (29) ◽

pp. 15289-15298 ◽

Cited By ~ 19

Author(s):

Pei-Hsing Huang ◽

Shang-Chao Hung ◽

Ming-Yueh Huang

Keyword(s):

Carbon Dioxide ◽

Molecular Dynamics ◽

Carbon Monoxide ◽

Fundamental Interaction ◽

Adsorption Study ◽

Vapor Adsorption ◽

Adsorption Behaviors ◽

Slit Pores ◽

The Ideal ◽

Liquid Vapor

We report a multi-component liquid–vapor adsorption study that allowed us to predict the ideal adsorption conditions and to explore the fundamental interaction and adsorption behaviors for formaldehyde, carbon dioxide, carbon monoxide, and water mixtures in GR slit pores.

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