Coupling the deoxygenation of benzoic acid with the oxidation of propylene on a Co molybdate catalyst

The influence of the hydrogen origin at the surface of Mo suboxide during the deoxygenation of carboxylic acid

“…These two species are thus quite different since the first one is richer in electron than the second one. This explanation is reinforced by others results presented elsewhere [8]: when the experiment P is reproduced on a Co molybdate catalyst, the conversion of propylene is higher and molecular hydrogen is not needed at all to allow the desorption of benzene. So, in presence of propylene, on Mo 8 O 23 , one can assume that one of the two hydrogen species is missing (or present in too small quantities) implying the non-formation of toluene and benzene.…”

XPS Characterization of CeO2 Catalyst for Hydrogenation of Benzoic Acid to Benzaldehyde

“…However, ZrO 2 -based catalysts in the hydrogenation of benzoic acid are not stable and produce significant amounts of by-products. Subsequently, other metal oxide catalysts, such as ZnO [5][6][7], Mo oxides [8][9][10], were also studied. Based on these reports, a typical Mars and van Krevelen mechanism is proposed in the hydrogenation of benzoic acid to benzaldehyde on metal oxides catalysts [11], as shown in Scheme 1.…”

The deoxygenation of benzoic acid as a probe reaction to determine the impact of superficial oxygen vacancies (isolated or twin) on the oxidation performances of Mo-based oxide catalysts

“…Previous publications indicate the obtained catalytic data [6,7]. In order to illustrate the type of results collected, we present here the data from three different tests (Fig.…”

“…No acrolein is detected as due to two technical limitations: (i) the high temperature (>405 K) maintained in all the catalytic system to avoid the solidification of the benzoic acid in the lines (MP benzoic acid = 394 K) is sufficient to induce the thermal degradation or the polymerisation of the acrolein, (ii) the maximum concentration of acrolein potentially produced in this system is below the threshold of the GC apparatus (2000 ppm). As a consequence, the carbon balance is not complete [7].…”

“…In a recent work [7], we have established that CO 2 formation is closely proportional to the benzene and benzaldehyde productions. Although a part of carbon dioxide directly comes from the transformation of the acidic function of www.elsevier.com/locate/cattod Catalysis Today 117 (2006) 46-52 benzoic acid leading to the formation of benzene, there is another origin for a small amount of CO 2 .…”