Theoretical Predictions of Equilibrium Properties and Diffusivities of Carbon Dioxide in Type A Molecular Sieves

1971 ◽  
pp. 144-154 ◽  
Author(s):  
R. W. H. SARGENT ◽  
C. J. WHITFORD
Keyword(s):  
Carbon Dioxide ◽  
Molecular Sieves ◽  
Type A ◽  
Theoretical Predictions

scholarly journals Carbon Dioxide Decomposition Over AlPO4 Based Molecular Sieves

2019 ◽  
Vol 8 (1) ◽  
pp. 25-33
Author(s):  
S. Siva Sankari S. Siva Sankari ◽  
M. A. Mary Thangam M. A. Mary Thangam ◽  
Chellapandian Kannan Chellapandian Kannan
Keyword(s):  
Carbon Dioxide ◽  
Molecular Sieves

Characterization of Carbon Molecular Sieves Using Methane and Carbon Dioxide as Adsorptive Probes

Langmuir ◽  
2003 ◽  
Vol 19 (20) ◽  
pp. 8335-8342 ◽  
Author(s):  
S. W. Rutherford ◽  
C. Nguyen ◽  
J. E. Coons ◽  
D. D. Do
Keyword(s):  
Carbon Dioxide ◽  
Molecular Sieves ◽  
Carbon Molecular Sieves

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

Radiocarbon ◽  
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.

Adsorption of Carbon Dioxide into Amine Functionalized Ordered Mesoporous Materials

2018 ◽  
Author(s):  
Marcela N. Barbosa ◽  
Maria J. F. Costa ◽  
Maricele N. Barbosa ◽  
Valter J. Fernandes Jr. ◽  
Giancarlo R. Salazar-Banda ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Molecular Sieves ◽  
Synthesis Method ◽  
Mesoporous Molecular Sieves ◽  
Carbon Dioxide Adsorption ◽  
X Ray ◽  
Ordered Mesoporous ◽  
Mcm 41

The adsorption of carbon dioxide on amino silanes-functionalized MCM-41 and SBA-15 materials is reported. The functionalization of mesoporous silicas was made by post-synthesis method, by impregnation of 3-aminopropyltriethoxysilane. The obtained materials were characterized by X-ray diffraction, scanning and transmission electron microscopies, nitrogen adsorption-desorption and X-ray photoelectron spectroscopy measurements. The carbon dioxide adsorption capacities for the samples were carried out under ambient pressures. The obtained results evidenced that amino-silanes with a terminal amine (–NH2) were functionalized through covalent coupling of this group on the surface of the channels in the ordered mesoporous silica, meaning that the amine is anchored on the surface of the bigger pores of the MCM-41 and SBA-15 support. For functionalized materials, the CO2 adsorption capacity of the AMCM-41 increased from 0.18 to 1.1 mmol·g−1, whereas for ASBA-15, it was from 0.6 to 1.8 mmol·g−1. The Lagergren kinetic algorithms were applied in order to validate the obtained results, evidencing the enhanced carbon dioxide adsorption capacity and stability of the functionalized ordered mesoporous molecular sieves.

Selective oxidation of cyclohexane in supercritical carbon dioxide over CoAPO-5 molecular sieves

2005 ◽  
Vol 110 (3-4) ◽  
pp. 351-356 ◽  
Author(s):  
Ruizhen Zhang ◽  
Zhangfeng Qin ◽  
Mei Dong ◽  
Guofu Wang ◽  
Jianguo Wang
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Selective Oxidation ◽  
Molecular Sieves ◽  
Supercritical Carbon
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