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

Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 20
Author(s):  
Seyed Sepehr Moeini ◽  
Umberto Pasqual Laverdura ◽  
Eleonora Marconi ◽  
Nicola Lisi ◽  
Emanuele Serra ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Aerobic Oxidation ◽  
Critical Role ◽  
Chemical Properties ◽  
Catalytic Performance ◽  
Pure Oxygen ◽  
Noble Metal Catalysts ◽  
Functionalized Mesoporous Silica ◽  
Oxidation Of Benzyl Alcohol

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.

Insights into the nature of alumina-supported MnOOH and its catalytic performance in the aerobic oxidation of benzyl alcohol

2009 ◽  
Vol 10 (7) ◽  
pp. 1122-1126 ◽  
Author(s):  
Qinghu Tang ◽  
Xiaonan Gong ◽  
Chengming Wu ◽  
Yuanting Chen ◽  
Armando Borgna ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Oxidation Of Benzyl Alcohol

scholarly journals Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde on Au8 and Au6Pd2 Clusters: A DFT Study on the Reaction Mechanism

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 720
Author(s):  
Jitlada Kodchasee ◽  
Chanon Chanloi ◽  
Pongtanawat Khemthong ◽  
Boontida Uapipatanakul ◽  
Masahiro Ehara ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Benzyl Alcohol ◽  
Density Functional ◽  
Aerobic Oxidation ◽  
Density Functional Theory Calculations ◽  
Adsorption Complex ◽  
Consecutive Reaction ◽  
Oxidation Of Benzyl Alcohol ◽  
Pd Clusters

Density functional theory calculations were performed to investigate the reaction mechanism of the aerobic oxidation of benzyl alcohol to benzaldehyde catalyzed by Au and Au–Pd clusters. Two consecutive reaction mechanisms were examined with Au8 and Au6Pd2 clusters: (1) the oxidation of benzyl alcohol with dissociated O atoms on metal clusters generating benzaldehyde and H2O; and (2) oxidation with adsorbed oxygen molecules generating benzaldehyde and H2O2. The calculations show that the aerobic oxidation of benzyl alcohol energetically prefers to proceed in the former mechanism, which agrees with the experimental observation. We demonstrate that the role of Au centers around the activation of molecular oxygen to peroxide-like species, which are capable of the H–abstraction of benzyl alcohol. The roles of Pd in the Au6Pd2 cluster are: (1) increasing the electron distribution to neighboring Au atoms, which facilitates the activation of O2; and (2) stabilizing the adsorption complex and transition states by the interaction between positively charged Pd atoms and the π-bond of benzyl alcohol, both of which are the origin of the lower energy barriers than those of Au8.

Solvent-Free Aerobic Oxidation of Benzyl Alcohol by Resin Supported Noble Metal Catalysts

2012 ◽  
Vol 466-467 ◽  
pp. 234-237
Author(s):  
Shao Xin Deng ◽  
Hu Wang ◽  
Tie Hong Chen
Keyword(s):  
Benzyl Alcohol ◽  
Noble Metal ◽  
Quaternary Ammonium ◽  
Aerobic Oxidation ◽  
Specific Interaction ◽  
Metal Catalysts ◽  
Metal Nanoparticle ◽  
Organic Polymer ◽  
Noble Metal Catalysts ◽  
Oxidation Of Benzyl Alcohol

Noble metal nanoparticle catalysts supported by resin were prepared by a simple adsorption method. Resin D261 is an organic polymer containing quaternary ammonium group. The specific interaction between quaternary ammonium groups and different kinds of noble metal precursors can be generally applied for the preparation of supported noble metal catalysts. Due to the specific interaction, an easy control of the loading of noble metal can be achieved. Furthermore, without using volatile organic solvents and calcinations in the preparation procedure, the method reported here is environmentally benign and economically feasible. The catalysts were tested in aerobic oxidation of benzyl alcohol to benzaldehyde under solvent- and base-free conditions and exhibited high activity and excellent selectivity.

scholarly journals Synthesis of Palladium and Copper Nanoparticles Supported on TiO2 for Oxidation Solvent-Free Aerobic Oxidation of Benzyl Alcohol

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1590
Author(s):  
Hamed M. Alshammari
Keyword(s):  
Benzyl Alcohol ◽  
Photoelectron Spectroscopy ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
X Ray ◽  
Oxidation Of Benzyl Alcohol ◽  
Transmission Electron ◽  
Bimetallic Nanostructures ◽  
Catalyst Reusability ◽  
Low Activity

The use of metal oxides as supports for palladium and copper (Pd–Cu) nanoalloys constitutes a new horizon for improving new active catalysts in very important reactions. From the literatures, Pd-based bimetallic nanostructures have great properties and active catalytic performance. In this work, nanostructures of titanium dioxide (TiO2) were used as supports for Pd–Cu nanoparticles catalysts. Palladium and copper were deposited on these supports using the sol-immobilisation method. The composite nanoalloys were characterized using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The catalyst was evaluated for the oxidation of benzyl alcohol. The effect of the Cu–Pd ratio using sol-immobilization methods supported on TiO2 was investigated. The results show that monometallic Cu/TiO2 was observed to have a low activity. However, as soon as the catalyst contained any palladium, the activity increased with a significant increase in the selectivity towards isomerization products. The influence of support and temperature were investigated. Furthermore, the catalyst reusability was also tested for oxidation of benzyl alcohol reactions, by repeatedly performing the same reaction using the recovered catalyst. The Pd–Cu/TiO2 catalyst displayed better reusability even after several reactions

High Performance Cu2 O–CoO/SiC Nanocomposites for Gas-Phase Oxidation of Benzyl Alcohol to Benzaldehyde

2019 ◽  
Vol 11 (5) ◽  
pp. 664-669
Author(s):  
Xiaodong Dai ◽  
Chunjian Hu ◽  
Huanrong Liu
Keyword(s):  
Benzyl Alcohol ◽  
Gas Phase ◽  
High Performance ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Oxidation Of Benzyl Alcohol ◽  
Phase Oxidation ◽  
Reaction Performance ◽  
Gas Phase Oxidation ◽  
Alcohol Conversion

High-performance CoO–Cu2 O/SiC is prepared for the gas-phase aerobic oxidation of benzyl alcohol of benzaldehyde, which delivers much higher catalytic performance (92% benzyl alcohol conversion and 99% selectivity at 260 °C) than the solo CoO/SiC and Cu2 O/SiC. TEM image indicates that the small size CoO and Cu2 O nanoparticles are homogeneously distributed on the support. Control experiments indicate that Cu2 O–CoO interfaces are responsible for their better reaction performance.

Catalytic Performance of MnOx Nanorods in Aerobic Oxidation of Benzyl Alcohol

2013 ◽  
Vol 26 (4) ◽  
pp. 424-430
Author(s):  
Jing Yang ◽  
Qing Hua ◽  
Su‐jie Chang ◽  
Xian‐qin Yu ◽  
Yun‐sheng Ma ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Oxidation Of Benzyl Alcohol
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