Quantitative Sulfur Determination of SBA-15 Supported Sulfonic Acid Catalysts

Sulfonic acids are potent organocatalysts for various reactions.  Methods to immobilize them on metal oxides supports such that they function as heterogeneous catalysts are ubiquitous, but there have been few studies to titrate their numbers and other potential oxidation products that form after the oxidation of grafted thiols to acids.