Mechanism of heterogeneous oxidation of acrolein to acrylic acid

Homogeneous Oxidation Reactions of Propanediols at Low Temperatures

“…The acrolein/O 2 /H 2 O mixtures formed via homogeneous oxidation of 1,3-propanediol resemble those used for acrylic acid synthesis on Mo-V oxide catalysts, [32,33] and is used here in a tandem reactor strategy to convert diols to acrylic acid without intervening treatment of the effluent between reactors. The homogeneous reactor was fed with a mixture of O 2 (8.8 kPa) and 1,3 propanediol (1 kPa, introduced as 10:1 H 2 O/diol molar ratio) at 503-543 K (14.1 s residence time; 5.6 cm 3 reactor volume).…”

A New DRIFTS Cell for the In-Situ Investigation of Heterogeneously Catalyzed Reactions

“…From the literature, only examinations using self-supporting catalyst wafers are known [9,10], since subtraction of the gas phase spectra were possible through the introduction of a reference cell on these occasions. From the literature, only examinations using self-supporting catalyst wafers are known [9,10], since subtraction of the gas phase spectra were possible through the introduction of a reference cell on these occasions.…”

10.1007/s10975-008-1016-3

“…As was demonstrated in earlier works [6,[16][17][18][19][20], partial oxidation reactions require catalysts containing acid and basic sites of certain strengths and the optimum combination of acid-base properties is the determining factor in the interaction between the reactant and the catalyst surface. As was demonstrated in earlier works [6,[16][17][18][19][20], partial oxidation reactions require catalysts containing acid and basic sites of certain strengths and the optimum combination of acid-base properties is the determining factor in the interaction between the reactant and the catalyst surface.…”

“…According to the literature, the high selectivity of catalysts with respect to incomplete oxidation products in partial oxidation reactions is due to the loosely bound forms of the initial reactant and reaction products and to the tightly bound oxygen species [6,[27][28][29][30][31]. Whether a tightly or a weakly bound form of the intermediate compound is formed on the surface depends on the strength of the acid sites, and the ratio of these forms determines the reaction route.…”

“…The highest activity and the highest selectivity with respect to the desired product, which is acrylonitrile, are shown by titanium-antimony catalysts that are either a solid solution of antimony ions in rutile titanium dioxide or the titanium antimonate TiSb 2 O 6 . In turn, these differences must give rise to a difference between the catalytic properties of the catalysts in partial oxidation reactions [2] because it is well known that the acid-base surface properties of oxide catalysts have an effect on their catalytic properties in partial oxidation reactions [2][3][4][5][6][7]. This lack of information has primarily been due to the low spatial resolution of electron microscopy, which has been unable to study the real structure of ultrafine catalysts.…”