Involvement of Surface‐Bound Radicals in the Oxidation of Toluene Using Supported Au‐Pd Nanoparticles

Abstract

Radikale spielen eine Rolle: Au‐Pd‐Nanopartikel mit einer mittleren Größe von 3–4 nm auf einem TiO2‐Träger (siehe Bild; Skalierung 2 nm) zeigen hohe Aktivität in der selektiven Oxidation von aromatischen Kohlenwasserstoffen mit tert‐Butylhydroperoxid als Oxidationsmittel. Die trägerfixierten Nanopartikel stabilisieren oberflächengebundene Radikale.

Excellent catalytic performance, thermal stability, and water resistance of 3DOM Mn2O3-supported Au–Pd alloy nanoparticles for the complete oxidation of toluene

“…For example, the T 90% (temperature required for achieving a 90 % conversion of toluene) was 234 o C over Pd/Co 3 AlO [8], much lower than that (340 o C) over Co 3 AlO. Recently, gold-based catalysts have been found to be effective in toluene oxidation [10][11][12][13][14][15]. For instance, the T 90% for toluene oxidation was 182 and 170 o C over Au/γ-MnO 2 [11] and Au/La 0.6 Sr 0.4 MnO 3 [12], respectively.…”

“…Catalytic oxidation is one of the most promising approaches for VOCs removal [1][2][3][4][5][6][7][8]. Although transition-metal oxides exhibit good catalytic performance for VOCs oxidation at high temperatures [2][3][4][5], supported noble metals perform well at low temperatures [6][7][8][9][10]. For example, the T 90% (temperature required for achieving a 90 % conversion of toluene) was 234 o C over Pd/Co 3 AlO [8], much lower than that (340 o C) over Co 3 AlO.…”

Morphology‐Tuned Exceptional Catalytic Activity of Porous‐Polymer‐Supported Mn3O4 in Aerobic sp3 CH Bond Oxidation of Aromatic Hydrocarbons and Alcohols

“…[b–d] Toluene (0.47 mol) at 190 °C and 1.0 MPa O 2 on catalyst (1.0 g) for 2 h. 8a [e] Ref. 8b. [f] Mn 3 O 4 @SiO 2 and Mn 3 O 4 @C catalysts were prepared at 160 °C solvothermal temperature.…”

“…Similarly, a high aldehyde selectivity of 85.7 % was attained for the oxidation of aromatic hydrocarbons by using heterogeneous Cu/Al 2 O 3 catalyst under very high temperature and pressure (190 °C and 1.0 MPa O 2 pressure) 8a. TiO 2 ‐supported Au–Pd nanoparticles exhibited catalytic activity for toluene oxidation at 80 °C with a conversion of 5.3 % and relatively low benzaldehyde selectivity of 32 % 8b. In this case, higher conversion was achieved under prolonged reaction time for 72 h.…”

Radical‐Pair Formation in Hydrocarbon (Aut)Oxidation

“…(Aut)oxidation is an important chemical process that has profound implications for industrial, atmospheric, combustion, and biological chemistry . Autoxidation processes of industrial relevance such as the free‐radical‐mediated oxidation of toluene to benzaldehyde and benzoic acid are initiated in a controlled manner through the homolytic activation of hydroperoxides by transition‐metal ions and metal catalysts or by free‐radical initiators such as benzoyl peroxide or dibenzyl hyponitrite .…”