Gas Phase Adsorption
Gas Phase Adsorption - Related Videos
11:00
Determination of the Gas-phase Acidities of Oligopeptides
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Cited by 3 •
2013
The determination of the gas-phase acidities of cysteine-containing oligopeptides is described. The experiments are performed using a triple quadrupole mass spectrometer. The relative acidities of the peptides are measured using collision-induced dissociation experiments, and the quantitative acidities are determined using the extended Cooks kinetic method.
09:46
Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
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Cited by 1 •
2016
A protocol for high-temperature and high-pressure gas adsorption measurements on zeolite H-ZSM-5 using an adsorption measurement device based on a langatate crystal microbalance is presented. Prior to the adsorption measurements, the synthesis of zeolite H-ZSM-5 on the langatate crystal microbalance sensor by the steam-assisted crystallization (SAC) method is demonstrated.
09:23
A Protocol for Detecting and Scavenging Gas-phase Free Radicals in Mainstream Cigarette Smoke
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Cited by 18 •
2012
Spin-trapping ESR spectroscopy was used to study the effect of plant antioxidants lycopene, pycnogenol and grape seed extract on scavenging gas-phase free radicals in cigarette smoke.
01:17
Gas Chromatography: Types of Columns and Stationary Phases
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2024
Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves. For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
07:18
Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Cited by 5 •
2017
With solar energy as the driving force, a novel adsorption refrigeration system has been developed and experimentally investigated. Water vapor and zeolite formed the working pair of the adsorption system. This manuscript describes the setup of the experimental rig, the operation procedure, and the important results.
FAQs
Physisorption relies on weak intermolecular forces, whereas chemisorption creates stronger chemical bonds between gas molecules and surface sites. This distinction affects how strongly molecules are retained and how surface interactions are interpreted. Comparing the two modes helps chemists determine whether uptake is dominated by physical attraction or chemical bonding, which informs studies of separations and heterogeneous catalysis.
Pressure and temperature change the amount of gas that accumulates at a surface. Pressure affects how many molecules are available to interact with active sites, while temperature alters the conditions governing surface attachment. Examining adsorption across these variables allows researchers to compare material performance and identify conditions that favor greater uptake or controlled gas removal.
Surface chemistry determines the nature and availability of active sites where gas molecules interact. Differences in these sites can change the strength of attachment and the preference for particular molecules, producing selective uptake from a mixture. Chemists therefore examine surface chemistry when designing or evaluating materials for selective separation, contaminant removal, or catalytic control.
Adsorption isotherms show how the amount adsorbed changes with conditions such as pressure, revealing patterns of surface uptake. Kinetic measurements track how adsorption changes over time and provide information about the rate of the process. Together, these measurements help characterize porous materials and connect their surface behavior with performance in chemical applications.
A study evaluates how much gas a material adsorbs while varying relevant conditions, especially pressure and temperature. Researchers can then organize the uptake data as an adsorption isotherm and separately monitor changes over time for kinetic analysis. This workflow links measured adsorption behavior to surface properties and supports comparisons among candidate materials.
Chemists apply gas phase adsorption when they need to characterize porous materials, remove contaminants, or separate components of a gas mixture. The same surface interactions can support heterogeneous catalysis, where chemical control at a solid surface matters. Results from adsorption measurements also inform gas storage, environmental remediation, and industrial process design.