Unravelling the intrinsic synergy between Pt and MnO_x supported on porous calcium silicate during toluene oxidation

Abstract

Developing efficient catalysts that enhance electronic interactions between active metal sites is a promising strategy for removing volatile organic compounds (VOCs). Herein, we report the preparation of a series of...

Enhancement Effect Induced by the Second Metal to Promote Ozone Catalytic Oxidation of VOCs

“…With the aim of studying the effect of Ce on Pt electron transfer, X-ray photoelectron spectroscopy (XPS) analysis (Figure a) is carried out. And the Pt in both catalysts exhibits the same combined valence of Pt 0 and Pt 2+ . ,− Notably, the binding energies of Pt 2+ in Pt–Ce/Mn present a remarkable positive core-level shift of 0.3 as compared with that in Pt/Mn, inferring that the coordination environment of Pt has been reconstructed during the introduction of Ce, and that the strong interaction between the two favors the electron transfer at the interface of Pt and CeO 2 process (Pt 0 + Ce 4+ → Pt 2+ + Ce 3+ ). − The relative deviation ΔB.E Pt of the standard binding energy of Pt 4f is then presented to further illustrate the oxidation state of Pt. Easily apprehending that a positive value indicates the oxidation state of Pt, and the higher the value, more electrons transfer from Pt to Ce/Mn.…”

Hydrophobically modified mesoporous silica supported Pt as a dual-function adsorbent buffer-catalyst for toluene removal under low-temperature

“…Tang et al designed ZnNiAl hydrotalcite-like compounds 13 and Mn-Si-MEL materials 14 as bifunctional catalysts with toluene decomposition at 280 1C, and Hao et al designed a Mn x Al layered double hydroxide 15 to catalyze the oxidation for acetone at low temperatures and achieved 90% acetone conversion at 164 1C. Several molecular simulations 16 and mechanistic studies 17,18 also exist in adsorption/catalysis. These investigations have made some progress in the catalytic performance for toluene, requiring temperatures above 200 1C.…”