High-performance benzyl alcohol oxidation catalyst: Au-Pd alloy with ZrO2 as promoter

Wu, Pingping; Song, Lei; Wang, Yue; Liu, Xuehua; He, Zhengke; Bai, Peng; Zhang, Yan

doi:10.1016/j.apsusc.2020.148059

Cited by 27 publications

(15 citation statements)

References 62 publications

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“…The importance of the selective conversion of benzyl alcohol to benzaldehyde is great. The recent reported models for such type of oxidation use expensive metals 46 and their complexes, which are not easy to synthesize on an industrial scale such as the combination of two noble metals Au–Pd alloy along with ZrO 2 as the promoter, 47 few of which are accompanied by high temperature conditions. 3 Not many reports are available for this conversion catalyzed by Cu NPs and no report, particularly for CuS NPs, has been reported to the best of our knowledge.…”

Section: Resultsmentioning

confidence: 99%

Versatile precursor-dependent copper sulfide nanoparticles as a multifunctional catalyst for the photocatalytic removal of water pollutants and the synthesis of aromatic aldehydes and NH-triazoles

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Versatile precursor-dependent copper sulfide nanoparticles as a multifunctional catalyst for the photocatalytic removal of water pollutants and the synthesis of aromatic aldehydes and NH-triazoles

et al. 2021

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“…Selective oxidation of alcohols is an important organic synthesis reaction, which is widely applied for producing organic intermediates and fine chemical products. − Compared to the traditional stoichiometric oxidants (such as dichromate and permanganate), employing clean and cheap molecular oxygen is a green and sustainable process, which is the most important factor while choosing a proper catalyst. Among the reported noble metal catalysts such as Au, − Pd, − AuPd, − and so forth, Pd-supported nanocatalysts have attracted wide attention owing to their outstanding activity and selectivity, which are highly reliable on the Pd particle size and properties of the support.…”

Section: Introductionmentioning

confidence: 99%

Highly Dispersed Pd Nanoclusters on Layered Double Hydroxides with Proper Calcination Improving Solvent-Free Oxidation of Benzyl Alcohol

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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Highly dispersed Pd nanocluster (NC) catalysts x-PdNCs/LDH-T (where x is the Pd loading, T is the calcination temperature, and LDH refers to Ni 3 Al-layered double hydroxides) were synthesized by the electrostatic adsorption of atomically precise captopril (Capt)-protected Pd 17 Capt 8 clusters (∼1.4 nm) onto the LDH support followed by proper calcination. The 0.15-PdNCs/LDH-T (where T = 250, 270, and 280 °C) catalysts show similar Pd NCs with sizes of ∼1.6 nm highly distributed on the verge of small-sized LDH nanoplates (30−50 × ∼15 nm), while the 0.16-PdNCs/LDH-300 catalyst shows slightly increased Pd NCs size of ∼1.8 nm, attributable to the sintering between neighboring NCs. The as-obtained catalysts x-PdNCs/LDH-T all show excellent solvent-free aerobic oxidation activity of benzyl alcohol, and 0.15-PdNCs/LDH-280 exhibits the highest turnover frequency of 108,670 h −1 . This unprecedented activity can be attributed to the ultrafine Pd NCs with the complete exposure of interfacial sites Pd 0 /Pd 2+ −Ni 2+ −OH after removing the surface ligands contributing to the adsorption and activation of the reactants, the electronrich Pd 0 species stemmed from the electron transfer from Ni 2+ −OH groups to Pd clusters promoting the β-hydride elimination of metal-alkoxide intermediates and strong PdNCs−LDH synergistic interactions, while other catalysts with residual ligands or enlarged PdNCs along with less surface hydroxyls as well as a newly generated NiO phase exhibit reduced activity owing to the blocked or reduced active sites. Additionally, the present catalyst shows no significant activity loss after six runs, indicating its excellent recyclability.

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“…Oxidation of alcohols is amongst the most crucial and widely utilized reactions for synthesizing organic materials and developing key intermediate chemicals in petroleum and biorefinery sectors [1,2]. In particular, oxidation of benzyl alcohol (BnOH) to benzaldehyde (PhCHO) is of paramount importance, because the product is an indispensable intermediate for many organic syntheses [3], and is utilized in manufacturing pharmaceuticals and therapeutics, dyestuffs, fragrances, and flavours [4]. Traditionally, PhCHO is produced by hydrolysis of benzylidene chloride, which leaves undesirable chlorine contamination, or, by partial oxidation of toluene which suffers from low PhCHO selectivity [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Novel Pd-P Nano-Alloy Supported on Functionalized Silica for Catalytic Aerobic Oxidation of Benzyl Alcohol

et al. 2021

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Catalytic aerobic oxidation of benzyl alcohol (BnOH) to benzaldehyde (PhCHO) over supported noble metal catalysts has grabbed the attention of researchers due to the critical role of PhCHO in numerous industrial syntheses. In the present study, a novel catalyst, Pd-P alloy supported on aminopropyl-functionalized mesoporous silica (NH2-SiO2), was prepared through in situ reduction and characterized by BET-BJH analysis, SEM, TEM, XRD, FTIR, TG-DTA, and XPS. Chemical properties and catalytic performance of Pd-P/NH2-SiO2 were compared with those of Pd0 nanoparticles (NPs) deposited on the same support. Over Pd-P/NH2-SiO2, the BnOH conversion to PhCHO was much higher than over Pd0/NH2-SiO2, and significantly influenced by the nature of solvent, reaching 57% in toluene at 111 °C, with 63% selectivity. Using pure oxygen as an oxidant in the same conditions, the BnOH conversion increased up to 78%, with 66% selectivity. The role of phosphorous in improving the activity may consist of the strong interaction with Pd that favours metal dispersion and lowers Pd electron density.

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High-performance benzyl alcohol oxidation catalyst: Au-Pd alloy with ZrO2 as promoter

Cited by 27 publications

References 62 publications

Versatile precursor-dependent copper sulfide nanoparticles as a multifunctional catalyst for the photocatalytic removal of water pollutants and the synthesis of aromatic aldehydes and NH-triazoles

Versatile precursor-dependent copper sulfide nanoparticles as a multifunctional catalyst for the photocatalytic removal of water pollutants and the synthesis of aromatic aldehydes and NH-triazoles

Highly Dispersed Pd Nanoclusters on Layered Double Hydroxides with Proper Calcination Improving Solvent-Free Oxidation of Benzyl Alcohol

A Novel Pd-P Nano-Alloy Supported on Functionalized Silica for Catalytic Aerobic Oxidation of Benzyl Alcohol

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