Physisorption of Sample Clauses

Physisorption ofΒ nitrogen (BET) The physical isotherm adsorption and consecutively desorption of inert gas molecules (usually nitrogen) on the surface of a solid gives the possibility to calculate the specific surface area, pore size, pore volume and distribution of pores of catalysts. The BET method, discovered by Xxxxxxxx, Xxxxx and Xxxxxx [13] [14], is an accredited way analysis to calculate the specific surface area and it is based on the Langmuir theory [15]. The resulting BET equation is: 1 𝑐 βˆ’ 1 𝑝 1 𝑝0 = βˆ™ ( ) + 𝑣 βˆ™ 𝑐 𝑝 𝑣 (3.8) βˆ™ 𝑐 𝑣 βˆ™ [( 𝑝 ) βˆ’ 1] π‘š 0 π‘š where 𝑣 is the volume of adsorbed gas, π‘£π‘š is the volume of the adsorbed when a monolayer is formed, 𝑝 and 𝑝0 are the equilibrium and the saturated pressure of the gas adsorbed in isotherm condition and 𝑐 is the BET constant that depends on the heat of adsorption of the adsorbed gas over the surface. The analysis provides a trend of the amount of gas adsorbed π‘›π‘š versus the relative pressure p/p0 and the specific surface area is expressed as: π‘£π‘š βˆ™ 𝑁𝑠 π‘š 𝑆𝐡𝐸𝑇 = 𝑉 βˆ™ π‘Ž (3.9) where 𝑁𝑠 is the Avogadro’s number, 𝑉 is the molar volume of the adsorbate gas, π‘Žπ‘š is the mass of the sample. Pore size, pore volume and distribution of pores of catalysts are obtained from the desorption isotherms applying the method of Barret, Xxxxxx and Xxxxxxx (BJH) [16]. In this work the analysis was for the support with and without catalyst to understand the contribution of the catalyst. The analysis was carried out under N2 adsorption/desorption isotherms at its boiling temperature (T=77) and equilibrium pressure of 780 mmHg using a Micromeritics Tristar-II.
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