Pt/SBA-15 as a Highly Efficient Catalyst for Catalytic Toluene Oxidation

Abstract

The catalytic oxidation of toluene has been investigated using a series of Pt/SBA-15 and Pt/SiO 2 catalysts, and the Pt/SBA-15 catalyst exhibits significantly higher catalytic activity for the oxidation of toluene than the Pt/SiO 2 catalysts. The SBA-15-supported Pt nanoparticles possess the ability to strongly dissociate toluene to benzene, hydrocarbon fragments (CH x ), and H 2 at low temperatures, but the Pt/SiO 2 catalysts are nonreactive toward the decomposition of toluene. The products resulting from the dissociation of toluene were easily oxidized by oxygen, thereby positively affecting the conversion rate of toluene oxidation on Pt/ SBA-15. Temperature-programmed desorption measurements clearly indicate that the dissociation reaction mainly consists of breakage of the C−C bonds between the phenyl and methyl groups. Combined density functional theory (DFT) calculations and DRIFT spectroscopy are carried out to investigate the stretching frequency of CO adsorbed on the defect sites of various Pt clusters, suggesting that the subnanosized Pt particles (icosahedron cluster) and/or Pt single atom may be formed in the structure of SBA-15. Pt sites associated with low coordination and subnanoscale Pt particles and/or single Pt atoms in the SBA-15 support can facilitate toluene adsorption and induce strong dissociation.

Novel mechanistic view of catalytic ozonation of gaseous toluene by dual-site kinetic modelling

“…Nevertheless, positive adsorption entropy (100 J mol −1 K −1 ) and enthalpy (8 kJ mol −1 ) values were obtained, thereby indicating the occurrence of endothermic adsorption, which is uncommon for catalytic reactions [24,25].…”

Toluene oxidation catalyzed by NiO/SiO2 and NiO/TiO2/SiO2: Towards development of humidity-resistant catalysts

“…Generally, noble metals such as Pt and Pd have been found to show very high activity and selectivity towards catalytic total oxidation of VOCs [11][12][13][14][15]; however, these are known to be expensive and therefore, more economic alternatives have been searched for the last several decades [16][17][18][19][20]. It has been found that less expensive materials such as Mn-oxide, Cu-oxide and Ni-oxide can also show substantially high activity towards oxidation of VOCs [16,[20][21][22][23][24][25].…”

Promoting Effect and Mechanism of Alkali Na on Pd/SBA‐15 for Room Temperature Formaldehyde Catalytic Oxidation

“…It can be attributed to the shrinkage of SBA-15 framework accompanied by a decrease in the cell parameter a 0 due to the formation of reduced Pd species. [42] Figure 4B shows the wide- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 angle XRD patterns of samples. A broad diffraction peak at 2θ � 22°was observed in all samples, which was assigned to amorphous silica of SBA-15.…”