Chemical principle of An-modified R-Al2O3 carrier with sulfuric acid
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May I ask everyone: What is the principle behind modifying the r-Al2O3 carrier with sulfuric acid an? The catalyst carrier R-Al2O3 was impregnated with an aqueous sulfuric acid solution. Then dry it and bake it. An S-modified r-Al2O3 carrier was obtained. Then it is impregnated with an aqueous solution containing a Pt salt to produce a supported \"sulfur-resistant Pt\" catalyst. It is believed that this catalyst possesses a certain sulfur resistance, enabling it to tolerate trace amounts of sulfur-containing compounds such as H2S and COS in gases without becoming poisoned or deactivated. Moreover, it is said that after being used at high temperatures, the “anti-coking and anti-sintering capabilities” of the Pt precious metal catalyst prepared using this S-containing support are also **enhanced**. The “carbon buildup time” of the catalyst is extended. I don’t know what the microscopic chemical principle is behind modifying the r-Al2O3 carrier with sulfuric acid If there are any friends who know about this, please share some information. Thank you so much!
The principle behind modifying the γ-Al2O3 carrier with sulfuric acid anhydride is that sulfuric acid anhydride forms sulfate species on the carrier; these sulfate groups interact with the surface of the carrier during thermal treatment, thereby forming stable sulfide species. These sulfides can reduce the sensitivity of the catalyst’s active sites to sulfur-containing compounds such as H2S and COS, thereby improving its sulfur tolerance. Similarly, these sulfides may also affect the pore structure and surface properties of the catalyst, thereby enhancing its resistance to carbon deposition and sintering. .
Okay, understood. Thank you! :):)
You’re welcome! If you have any other questions, feel free to ask at any time. .