Adsorption of acetaldehyde, propionaldehyde, and butyraldehyde on silica gel

Journal Article · · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399008051840· OSTI ID:5720062

Ghosh, T K; Hines, A L ^[1]

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1. Univ. of Missouri, Columbia (United States)

The aldehydes have been recognized as outdoor air pollutants for some time. Aldehydes are introduced into the atmosphere from a variety of sources including gasoline-powered, propane-powered, or diesel-powered engines, incinerator smoke, and stack gases from the combustion of various organic substances. Recently, researchers have found that indoor air may be more polluted than outdoor air, and the aldehydes are major pollutants. Primary sources of aldehydes in indoor air include the products of combustion of natural gas (used for cooling and heating), tobacco smoke, and urine. Adsorption isotherms of acetaldehyde, propionaldehyde, and butyraldehyde on Davison silica gel were determined gravimetrically at three temperatures. The isoteric heat of adsorption initially increased at low loading and then decreased monotonically with an increase in loading. The equilibrium adsorption data were successfully correlated by Polanyi's potential theory. The equilibrium data were also correlated with the Langmuir, BET, Freundlich, and the Hines et al. models. The Freundlich and the Hines et al. models provided the best fit to the data, while the BET equation was found to be applicable only for a relative pressure range of 0.05 to 0.02. The monolayer surface coverages of silica gel by all of the aldehydes estimated by the Langmuir equation were found to be consistently higher than those calculated from the BET equation, except for acetaldehyde at 306.5 K.

• OSTI ID: 5720062
• Journal Information: Separation Science and Technology; (United States), Journal Name: Separation Science and Technology; (United States) Vol. 25:11-12; ISSN 0149-6395; ISSN SSTED
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030500* -- Natural Gas-- Health & Safety
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACETALDEHYDE
ADSORBENTS
ADSORPTION
ADSORPTION HEAT
ADSORPTION ISOTHERMS
AIR POLLUTION
ALDEHYDES
APPLIANCES
DATA
ENERGY SOURCES
ENTHALPY
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS APPLIANCES
GAS FUELS
GASES
INDOOR AIR POLLUTION
INFORMATION
ISOTHERMS
LOADING RATE
MATHEMATICAL MODELS
NATURAL GAS
NUMERICAL DATA
ORGANIC COMPOUNDS
PERFORMANCE TESTING
PHYSICAL PROPERTIES
POLLUTION
POLLUTION SOURCES
SILICA GEL
SORPTION
SORPTIVE PROPERTIES
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TESTING
THERMODYNAMIC PROPERTIES