Localized Surface Plasmon Resonance Assisted Photothermal Catalysis of CO and Toluene Oxidation over Pd–CeO₂ Catalyst under Visible Light Irradiation

Abstract

The extinction peak of Pd particles generally locates at the ultraviolet light region, suggesting that only 4% of solar light can be absorbed. Furthermore, the efficiency of LSPR hot electrons converted to chemical energy of reaction is very low due to the fast relaxation of carriers. It is extremely valuable to design Pd-based catalysts which have strong response to the visible light irradiation and high efficiency in photon to chemical energy. The Pd–CeO2 catalyst was synthesized via the hexadecyl­trimethyl­ammonium bromide (CTAB) assisted liquid-phase reduction method to generate more active interfaces. The significant extinction of Pd–CeO2 in the visible to near-infrared region indicates the strong electron interaction between Pd and CeO2. LSPR hot electrons, transferring from the Pd metal particles to the conduction band of ceria, promote the dissociation of adsorbed oxygen. Therefore, the reaction temperature of CO and toluene oxidation can be significantly lowered by visible light irradiation. The maximum light efficiencies of Pd–CeO2 catalyst for toluene oxidation and CO oxidation are obtained as 0.42% and 1%, which benefit from the effective Pd–O–Ce interfaces.

Ultra-Small Pd Nanoparticles on Ceria as an Advanced Catalyst for CO Oxidation

“…At the same time, analysis of the literature data showed that some previously described similar compounds had a markedly lower catalytic activity ( Table 1). The materials described in [1][2][3][4] allowed complete oxidization of carbon monoxide only at temperatures over 100 • C. However, materials with low-temperature catalytic activity are also mentioned (e.g., the data mentioned in [5,6,8] for ceria supported Pd NPs are close to those obtained in this study). Such a difference in the temperatures of complete conversions can be associated with the location of metal NPs on various surfaces of CeO 2 -(100) or (111).…”

“…Supported noble-metal nanoclusters are well-known catalysts for diverse hydrogenation and oxidation reactions, particularly in CO oxidation. A number of attempts [1][2][3][4][5][6][7][8] were made to synthesize a catalyst on the basis of supported NPs with a high activity at low temperatures. The catalytic activity of NPs depends on the size and shape of the NPs [9], the material of the support [10] and the functionalization [11] and composition [12].…”

Controllable construction of Ce‐Mn‐Ox with tunable oxygen vacancies and active species for toluene catalytic combustion

“…According to the Ce 3d spectra (Figure 5a), the spectra for all catalysts were fitted into eight contributions and the features assigned to the spin‐orbit components of Ce 3d 3/2 and Ce 3d 5/2. [ 50–53 ] As can be seen from Figure 5a, the characteristic peaks of the Ce 4+ 3d 5/2 species are labelled V, V″ and V‴, and the Ce 4+ 3d 3/2 species are labelled U, U″ and U‴. [ 54,55 ] The couple peaks V′ and U′ are assigned to Ce 3+ 3d 5/2 and Ce 3+ 3d 3/2 , respectively.…”

Photocatalysis: Basic Principles, Diverse Forms of Implementations and Emerging Scientific Opportunities

“…[136] Interested readers are suggested to read several recent reviews on this topic. [137] We list this category here because many of these plasmonic materials are also known co-catalysts, such as metals including Au, [138] Ag, [139] Pd, [140] Cu, [141] Al, [142] and non-metals including Cu 2−x Se, [143] Cu 2−x S, [144] WO 3−x [145] and each of them features unique resonant photon wavelengths. Importantly, the resonant photon wavelength of the plasmonic nanoparticles can be tuned by varying their sizes, shapes, and material compositions.…”