Synthesis of Solketal Catalyzed by Acid-Modified Pyrolytic Carbon Black from Waste Tires.

Solketal, a widely used glycerol-derived solvent, can be efficiently synthesized through heterogeneous catalysis, thus avoiding the significant product losses typically encountered with aqueous work-up in homogeneous catalysis. This study explores the catalytic synthesis of solketal using solid acid catalysts derived from recovered carbon blacks (rCBs), which are obtained through the pyrolysis of end-of-life tires. This was further converted into solid acid catalysts through the introduction of acidic functional groups using concentrated HSO or 4-benzenediazonium sulfonate (BDS) as sulfonating agents.

One-pot synthesis of vanadium-containing silica SBA-3 materials and their catalytic activity for propene oxidation.

V-containing silica SBA-3 mesoporous catalysts were prepared by means of one-pot hydrothermal procedure with NHVO or VOSO as vanadium precursors under various acidic medium of the reaction mixture (pH < 1, 2.2 or 3.1).