Untitled

Simonova

et al. 2006

React Kinet Catal Lett

Oxidation of propene to acetone in water solutions in the presence of homogeneous catalysts (Pd 2+ + HPA-x, where HPA-x = H 3+x PV x Mo 12-x O 40 , x = 1−4) is studied. This reaction is shown to be of 1st order with respect to C 3 H 6 and of the 0.5th order with respect to Pd. The reaction rate does not depend on the concentration of HPA-x and acidity of the catalyst solution. The apparent activation energy of the reaction is 21 kJ/mol. A reaction mechanism is proposed.

“…The reaction order with respect to Pd proves to be 0.5 for all the HPA-x studied (see Fig. 3) and is smaller than the corresponding order of 0.66 in the n-C 4 H 8 oxidation [9].…”

Section: Resultsmentioning

confidence: 66%

“…The kinetics of the C 3 H 6 oxidation (1) resembles the corresponding kinetics of the n-C 4 H 8 oxidation [9].…”

Section: Resultsmentioning

confidence: 92%

Kinetics and mechanism of the wet oxidation of propene to acetone in the presence of Pd2+ ions and Mo-V-phosphoric heteropoly acids

Simonova

et al. 2006

React Kinet Catal Lett

“…This reaction was studied at atmospheric pressure and 303-343 K in a thermostated shaken glass reactor (volume 170 mL) [3]. First, the reactor with 20 mL of the catalyst was blown out with 1-butene without bubbling.…”

Section: Methodsmentioning

confidence: 99%

“…Direct homogeneous catalytic oxidation of C 2 -C 4 alkenes with dioxygen over HPA-x is the most promising method of the production of carbonyl compounds [1, 2]: 3 (1)…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability of palladium in homogeneous chloride-free catalysts Pd + heteropoly acid for oxidation of C2-C4 alkenes by dioxygen

Matveev

2007

React Kinet Catal Lett

Aqueous Solutions of Mo‐V‐Phosphoric Heteropoly Acids as Bifunctional Catalysts For Preparation of 9,10‐Anthraquinone and its Hydrogenated Derivatives

2012

ChemCatChem

Acid‐catalyzed condensation of 1,3‐butadiene with para‐quinones and oxidation of resulting adducts can be performed as a one‐pot process in the presence of aqueous solutions of Mo‐V‐phosphoric heteropoly acids (HPA) with the general formula HaPzMoyVxOb. These solutions have bifunctional catalytic properties; they are both strong Brønsted acids and reversible oxidants. Condensation of hydroquinone, 1,4‐benzoquinone, or 1,4‐naphthoquinone with 1,3‐butadiene in the HPA solutions results in 9,10‐anthraquinone (AQ) in a mixture with tetrahydro‐AQ (THA) and dihydro‐AQ (DHA). In this one‐pot process, which proceeds in the absence of organic solvents, the HPA solution is reduced. A slightly soluble mixture of THA, DHA, and AQ is precipitated and filtered off. The non‐Keggin‐type H12P3Mo18V7O85 solution is the most effective in this process. This solution can be rapidly regenerated by dioxygen or air at temperatures of up to 170 °C and then reused. The prepared THA+DHA+AQ mixture can be used as a catalyst for alkaline delignification of wood. Our homogeneous bifunctional HPA catalyst is very stable and promising for use in similar one‐pot processes.