Nitrogen Gas Adsorption
Nitrogen Gas Adsorption - Related Videos
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.
01:49
The Nitrogen Cycle
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2019
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
08:22
Nitrogen Compound Characterization in Fuels by Multidimensional Gas Chromatography
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Cited by 3 •
2020
Here, we present a method utilizing two-dimensional gas chromatography and nitrogen chemiluminescence detection (GCxGC-NCD) to extensively characterize the different classes of nitrogen-containing compounds in diesel and jet fuels.
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.
10:41
Carbon and Nitrogen Analysis of Environmental Samples
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Elemental Analysis is a method used to determine elemental composition of a material. In environmental samples such as soils, scientists are particularly interested in the amounts of two ecologically important elements, nitrogen and carbon. Elemental analysis by the flash combustion technique works by oxidizing the sample with a catalyst through combustion in a high-temperature chamber. The products of combustion are...
FAQs
Physical adsorption allows nitrogen molecules to accumulate through interactions with surface sites rather than through a stated chemical transformation. As pressure increases, the adsorbed layer can progress from a monolayer to multilayers. This progression matters because the measured amount of nitrogen reflects how much accessible surface is available under the measurement conditions.
An adsorption isotherm links the amount of nitrogen adsorbed with pressure during the measurement. Its shape records how gas accumulation changes as surface coverage develops, providing the experimental relationship needed for subsequent interpretation. Rather than being a single surface-area value, the isotherm serves as the data basis for estimating surface area and examining pore-related properties.
The Brunauer–Emmett–Teller equation uses the adsorption relationship to estimate a solid’s specific surface area. Its relevance is that multilayer formation is included in the interpretation rather than treating adsorption as limited to one molecular layer. The resulting surface-area value supports comparisons among catalysts, powders, porous materials, and adsorbents.
A basic analysis measures how much nitrogen accumulates on a solid while pressure is varied, typically near liquid-nitrogen temperature. The resulting measurements are organized as an adsorption isotherm. Researchers then apply the BET equation to estimate specific surface area and perform further analysis to obtain pore volume and pore-size information.
Pore-related information is derived by analyzing the nitrogen adsorption data beyond the surface-area calculation. The pressure-dependent accumulation of nitrogen provides the basis for estimating pore volume and describing pore-size characteristics. These results complement the BET surface area, allowing a material to be evaluated through both its external accessible surface and its porous structure.
This method is useful when researchers need to evaluate the surface and pore characteristics of catalysts, porous materials, powders, or adsorbents. Specific surface area can indicate how extensive the accessible surface is, while pore volume and pore-size information describe the material’s internal structure. Together, these outcomes support characterization and comparison across materials research applications.