Measuring the Isosteric Heat of Adsorption of CO2 on Micro-Porous Carbons

This application note details the method for obtaining the isosteric heat of adsorption of CO2 on a range of adsorbent grade activated carbons. CO2 adsorption isotherms below saturation vapor pressure were collected using a Micromeritics® 3Flex Surface Analyzer equipped with an iso-controller unit for temperature control. Isosteric heat of adsorption is calculated across the fullest […]

Calculating Free Space with Micromeritics Static (Manometric) Adsorption Instruments

Introduction Specific Surface Area and the Pore Volume Distribution of materials are frequently determined from the adsorption isotherm, which is the quantity of gas that is adsorbed onto the surface and within the pores of a material as a function of pressure above the sample. These analyses are frequently conducted at cryogenic temperatures to enhance […]

Characterization of Carbons Using a Micromeritics 3Flex

Dr. Darren Lapham, MCA Services, Cambridgeshire, UK. This application note describes the analysis of full gas adsorption / desorption isotherms of carbon black samples using a Micromeritics 3Flex micropore instrument. From the isotherms, BET surface area together with micro-pore, meso-pore and small macro-pore size distributions can be ascertained along with pore volume and pore area. […]

Adding a Custom Model to the NLDFT Library – A CO2 GCMC Model for Carbons

New models for determining the pore volume and pore size distribution of porous solids may be easily added to MicroActive™. These kernels developed using NLDFT, GCMC and other variants have been available for more than 20 years. Traditionally instrument manufacturers have supplied these proprietary models. To introduce new powerful capabilities for users, Micromeritics has developed […]

Characterization of Medicinal Tablet Surface Area with the Gemini Series

Gas adsorption surface area values can predict the reaction rate of compounds such as medicinal products in tablet or powder form. The dissolution rates of these products are directly related to the magnitude of their surface areas. Tablets and powders generally have low gas adsorption surface area values. The Materials Analysis Lab (MAL) at Micromeritics […]

Sample Preparation for Breakthrough Analysis

Introduction Breakthrough analysis is a powerful technique for determining the adsorption capacity of adsorbent materials under flow conditions. Breakthrough analysis allows users to more closely mimic process conditions than what can be achieved through static adsorption measurements. Additionally, it allows for easy multicomponent measurements when utilizing a mass spectrometer to determine the outlet species from […]

Improved BJH Pore Size Distribution Using the Maximum Volume Increment Option

Pore size distribution is usually determined by gas adsorption techniques from the gas adsorption isotherm. For samples with 2 to 50-nm pore structure, BJH is the most commonly used method for calculating pore size distribution. In order to get good results, sufficient isotherm sorption points are needed. However, the adsorbed volume at a certain relative […]

Degas Options for Sample Preparation

Introduction A degas study was conducted to determine the effectiveness of flow versus vacuum degas. An amorphous silica-alumina and a microporous zeolite were prepared by both techniques and then nitrogen isotherms were collected for both materials. The resulting isotherms established equivalence between vacuum versus flow degas. Theory Typical degas options include vacuum or flowing degas. […]

Using the ASAP 2020 for Determining the Hydrogen Adsorption Capacity of Powders and Porous Materials

Fuel cells were first conceived in 1838 by Swiss scientist Christian Schönbein; the first fuel cell was developed by Welsh scientist Sir Willian Grove in 1843. The first practical applications of fuel cells came in the 1960s for the U. S. space program. Both energy and water could be generated from two widely available fuels […]

Micropore Analysis of Zeolites Using the ASAP 2420

Introduction Six zeolite samples were analyzed simultaneously using the ASAP 2420 equipped with the Micropore option. This option enables you to perform micropore analyses on all six ports at the same time, comparable to the High Throughput mode. These analyses were performed using argon as the adsorptive at 87K. Typical micropore analyses using nitrogen may […]