Actually, I am working on steam reforming of hydrocarbons field. As we know, lots of carbon generate over catalyst surface during reaction time. Before the reaction, I used binder such as bentonite to make catalyst extrude. So, the bentonite surface area will include with actual catalyst surface area. I want to know that how can I know the surface area of the catalyst after reaction.
Dear Sujoy Bepari,
Specific surface area (SSA) is a property of solids defined as the total surface area of a material per unit of mass (with units of m²/kg or m²/g) or solid or bulk volume (units of m²/m³ or m−1).
It is a derived scientific value that can be used to determine the type and properties of a material (e.g. soil or snow. It has a particular importance for adsorption, heterogeneous catalysis, and reactions on surfaces.The SSA can be simply calculated from a particle size distribution, making some assumption about the particle shape. This method, however, fails to account for surface associated with the surface texture of the particles.The SSA can be measured by adsorption using the BET isotherm. This has the advantage of measuring the surface of fine structures and deep texture on the particles. However, the results can differ markedly depending on the substance adsorbed.
Regards,
Prem Baboo
https://www.researchgate.net/post/What_is_the_relation_between_active_surface_area_and_BET_surface_area?_tpcectx=topic_detail&_trid=BIP9rSRRaLY4k2hFRZQ9u0Wr_6
https://www.researchgate.net/post/Why_the_BET_surface_area_is_lower_than_micropore_surface_area_calculated_by_DR_method?_tpcectx=topic_detail&_trid=BIP9rSRRaLY4k2hFRZQ9u0Wr_4
You have to do the same reaction with Bentonite and with out Bentonite or with catalyst and without catalyst (what ever it is possible), the difference will give specific surface area of spent catalyst. When carbon is chocked the catalyst, you have to activate the catalyst at higher temperature. You can tune the activation and adsorption temperature depend on your need.
Hello, you have to know how to clean your spent catalyst for nitrogen adsorption (and further study of BET surface area) without modifying the surface area. I suggest you do a TG-DTA in air to see which is the maximum temperature you can use, to obtain reproducible results of SBET, without decomposition of the carbonaceous deposits.
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