Silver Nanoparticles Supported on CeO₂‐SBA‐15 by Microwave Irradiation Possess Metal–Support Interactions and Enhanced Catalytic Activity

Abstract

Metal-support interactions (MSIs) and particle size play important roles in catalytic reactions. For the first time, silver nanoparticles supported on CeO2-SBA-15 supports are reported that possess tunable particle size and MSIs, as prepared by microwave (MW) irradiation, owing to strong charge polarization of CeO2 clusters (i.e., MW absorption). Characterizations, including TEM, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure, were carried out to disclose the influence of CeO2 contents on the Ag particle size, MSI effect between Ag nanoparticles and CeO2-SBA-15 supports, and the strong MW absorption of CeO2 clusters that contribute to the MSIs during Ag deposition. The Ag particle sizes were controllably tuned from 1.9 to 3.9 nm by changing the loading amounts of CeO2 from 0.5 to 2.0 wt%. The Ag nanoparticle size was predominantly responsible for the high turnover frequency (TOF) of 0.41 min(-1) in ammonia borane dehydrogenation, whereas both particle size and MSIs contributed to the high TOF of 555 min(-1) in 4-nitrophenol reduction for Ag/0.5CeO2-SBA-15, which were twice as large as those of Ag/SBA-15 without CeO2 and Ag/CeO2-SBA-15 prepared by conventional oil-bath heating.

Synthesis of Ce ions doped metal–organic framework for promoting catalytic H2 production from ammonia borane under visible light irradiation

“…Possible explanation can be attributed to the hypochromic effect, 28 in which the interaction with metal ions destabilize the donor part of the chromophore, thus inhibiting donor ability of chromophore. 29 However, the aqueous solution Ce(NO3)3 exhibits the single peak at 5723 eV which can be ascribed to the transition of an electron in Ce 3+ from the Ce core 2p3/2 state up to an empty 5d state mixed with the Ce 4f 1 final state. In addition, both of Pd/MIL-101 and Pd/CeMIL-101 shows the similar absorption behavior to those of the samples without Pd nanoparticles loading.…”

RuPd Alloy Nanoparticles Supported on Plasmonic HxMoO3–y for Efficient Photocatalytic Reduction of p‐Nitrophenol

“…Hot energetic electrons generated from plasmonic H x MoO 3– y under visible light can transfer to the contiguous RuPd NPs. [8b], H x MoO 3– y support is thus positively charged and the surface of RuPd NPs are negatively charged, which may facilitate the dissociation of hydrogen molecules and the subsequent PNP reduction on RuPd NPs. [2b], [8c], Additionally, it was also found that the RuAu/H x MoO 3– y and RuPt/H x MoO 3– y hybrids are more active than Au/H x MoO 3– y and Pt/H x MoO 3– y under visible light irradiation (Figure S9a), respectively.…”

Color‐Controlled Ag Nanoparticles and Nanorods within Confined Mesopores: Microwave‐Assisted Rapid Synthesis and Application in Plasmonic Catalysis under Visible‐Light Irradiation

“…Here, chemical reduction of 4‐nitorophenol (4‐NP) into 4‐aminophenol was performed by a tandem reaction in which Ag serves a dual role to catalyze the dehydrogenation of AB and hydrogenation of 4‐NP. Here, AB was employed as a convenient H 2 source instead of conventional NaBH 4 because of the high stability and nontoxic property of AB 16c. 28…”