Molybdenum-containing systems based on natural kaolinite as catalysts for selective oxidation of aromatic sulfides

Highly active Pd containing EMT zeolite catalyst for indirect oxidative carbonylation of methanol to dimethyl carbonate

“…6. The bands at 1442 cm À1 (pyridine coordinated to Na + ions), 1457 cm À1 (pyridine interacting with coordinately unsaturated Al 3+ ions), 1574 cm À1 (weak Lewis acidity), 1593 cm À1 (hydrogen-bound pyridine) and 1611 cm À1 (hydrogen-bound pyridine) are assigned to Lewis-bound pyridine; the bands at 1542 cm À1 and 1637 cm À1 are attributed to Brønstedbound pyridine, and the band at 1487 cm À1 is assigned to pyridine associated with both Lewis and Brønsted acid sites [44][45][46][47]. Brønsted acid sites on both Pd/EMT and Pd/FAU catalysts possibly resulted from the ion exchange between Na + and NH 4 + (dissociation of NH 3 ÁH 2 O) during the preparation of catalysts, since the Na-form of EMT and FAU zeolites should be in the absence of Brønsted acidity [45,48].…”

Rh-Catalyzed Hydrogenation of Amino Acids to Biobased Amino Alcohols: Tackling Challenging Substrates and Application to Protein Hydrolysates

“…Nevertheless, the method of choice for the oxidation of cysteine and methionine should be highly efficient, allow to modify thiols and thioethers simultaneously, proceed in aqueous conditions, and preferably use an environmentally benign oxidant, such as hydrogen peroxide or even oxygen. Catalytic oxidation of thioethers is often limited to the sulfoxide stage, and this approach is therefore considered to be less useful for our purpose. − Inspired by the analytical determination of sulfur-containing amino acids in proteins, oxidation with performic acid is expected to be more promising. This unstable oxidant is produced in situ from hydrogen peroxide and formic acid and is able to transform cysteine and methionine selectively into cysteic acid and methionine sulfone, respectively.…”

“…Catalytic oxidation of thioethers is often limited to the sulfoxide stage and this approach is therefore considered to be less useful for our purpose. [72][73][74][75][76] Inspired by the analytical determination of sulfur-containing amino acids in proteins, oxidation with performic acid is expected to be more promising. This unstable oxidant is produced in situ from hydrogen peroxide and formic acid, and is able to transform cysteine and methionine selectively into cysteic acid and methionine sulfone, respectively.…”

Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions: a journey of vanadium-substituted Dawson-type phosphotungstic acid

“…According to the molecular cluster, HPA can be classified into Keggin type (Zhang et al 2020), Dawson type (Long et al 2010) and Anderson type (Chi et al 2020;Zhang et al 2017) et al Te et al (Te et al 2001 have highlighted that heteropolyacids with Keggin structure can effectively activate hydrogen peroxide and oxidize dibenzothiophene to form corresponding sulfone species. Muñoz (Muñoz et al 2017) found that molybdenum heteropolyacids with Anderson structure exhibit impressive catalytic activity for the abatement of p-phenylene sulfide. Albert et al (Bertleff et al 2017) proposed that H 8 PV 5 Mo 7 O 40 in Dawson structure could catalytic oxidative thiophenes and thioether sulfur compounds into water-soluble sulfates and sulfonic acid compounds.…”