Liquid-Phase Selective Oxidation by Multimetallic Active Sites of Polyoxometalate-Based Molecular Catalysts

2011 ◽  
pp. 127-160 ◽  
Author(s):  
Noritaka Mizuno ◽  
Keigo Kamata ◽  
Kazuya Yamaguchi
Keyword(s):  
Liquid Phase ◽  
Selective Oxidation ◽  
Active Sites ◽  
Molecular Catalysts

scholarly journals Metal-Organic Frameworks in Oxidation Catalysis with Hydrogen Peroxide

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 283
Author(s):  
Oxana Kholdeeva ◽  
Nataliya Maksimchuk
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Selective Oxidation ◽  
Metal Organic Frameworks ◽  
Short Review ◽  
Catalytic Performance ◽  
Oxidation Catalysis ◽  
Catalyst Stability ◽  
Aqueous Hydrogen Peroxide ◽  
Metal Organic

In recent years, metal–organic frameworks (MOFs) have received increasing attention as selective oxidation catalysts and supports for their construction. In this short review paper, we survey recent findings concerning use of MOFs in heterogeneous liquid-phase selective oxidation catalysis with the green oxidant–aqueous hydrogen peroxide. MOFs having outstanding thermal and chemical stability, such as Cr(III)-based MIL-101, Ti(IV)-based MIL-125, Zr(IV)-based UiO-66(67), Zn(II)-based ZIF-8, and some others, will be in the main focus of this work. The effects of the metal nature and MOF structure on catalytic activity and oxidation selectivity are analyzed and the mechanisms of hydrogen peroxide activation are discussed. In some cases, we also make an attempt to analyze relationships between liquid-phase adsorption properties of MOFs and peculiarities of their catalytic performance. Attempts of using MOFs as supports for construction of single-site catalysts through their modification with heterometals will be also addressed in relation to the use of such catalysts for activation of H2O2. Special attention is given to the critical issues of catalyst stability and reusability. The scope and limitations of MOF catalysts in H2O2-based selective oxidation are discussed.

Catalyzed Oxidation of Cyclohexane over Co-Bi2(MoO4)3 Catalysts

2012 ◽  
Vol 550-553 ◽  
pp. 354-357
Author(s):  
Su Ling Gao ◽  
Tai Xuan Jia ◽  
Zi Li Liu
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Selective Oxidation ◽  
Atomic Ratio ◽  
Precipitation Method ◽  
Micro Structure ◽  
Cooperative Effects ◽  
Catalyzed Oxidation

The effect of catalyst on the performance of liquid-phase selective oxidation of cyclohexane as probe reaction over Co-Bi2(MoO4)3 prepared by precipitation method was investigated. The catalyst evaluation results show that the optimum catalyst atomic ratio is n(Mo):n(Bi):n(Co)=1.5:1:0.2 with high selecivity under certain conversion. Meanwhile selective oxidation of Bi2(MoO4)3 was slowed down, selecivity of cyclohexanone and cyclohexanol reached 74.1%, 22.2% respectively.The main composition of the catalyst is Bi2(MoO4)3. Co-Bi2(MoO4)3 had new catalyst sites with Bi3+, Mo6+ and Co2+ having a cooperative effects during oxidation of cyclohexane. Under this condition, selecivity of cyclohexanone improved greatly. Micro-structure and essence disciplinarian of Co-Bi2(MoO4)3 were disclosed by XRD and FTIR. This study could provide experimental data for the technical reform of industry equipment.

Mono-Atomic Fe Centers in Nitrogen/Carbon Monolayers for Liquid-Phase Selective Oxidation Reaction

ChemCatChem ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 3539-3545 ◽  
Author(s):  
Li-Bing Lv ◽  
Shi-Ze Yang ◽  
Wen-Yu Ke ◽  
Hong-Hui Wang ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Selective Oxidation ◽  
Oxidation Reaction

Methane selective oxidation to methanol by metal-exchanged zeolites: a review of active sites and their reactivity

2019 ◽  
Vol 9 (8) ◽  
pp. 1744-1768 ◽  
Author(s):  
Muhammad Haris Mahyuddin ◽  
Yoshihito Shiota ◽  
Kazunari Yoshizawa
Keyword(s):  
Selective Oxidation ◽  
Active Sites ◽  
Recent Progress ◽  
Future Research ◽  
Research Challenges ◽  
Challenges And Opportunities

A review of the recent progress in revealing the structures, formation, and reactivity of the active sites in Fe-, Co-, Ni- and Cu-exchanged zeolites as well as outlooks on future research challenges and opportunities is presented.

scholarly journals Solid-to-liquid phase transitions of sub-nanometer clusters enhance chemical transformation

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Juan-Juan Sun ◽  
Jun Cheng
Keyword(s):  
Phase Transitions ◽  
Liquid Phase ◽  
Active Sites ◽  
Catalyst Activity ◽  
Ab Initio Molecular Dynamics ◽  
Free Energies ◽  
Elementary Reactions ◽  
Au Clusters ◽  
Calculate Temperature Dependence ◽  
Entropic Effects

AbstractUnderstanding the nature of active sites is crucial in heterogeneous catalysis, and dynamic changes of catalyst structures during reaction turnover have brought into focus the dynamic nature of active sites. However, much less is known on how the structural dynamics couples with elementary reactions. Here we report an anomalous decrease in reaction free energies and barriers on dynamical sub-nanometer Au clusters. We calculate temperature dependence of free energies using ab initio molecular dynamics, and find significant entropic effects due to solid-to-liquid phase transitions of the Au clusters induced by adsorption of different states along the reaction coordinate. This finding demonstrates that catalyst dynamics can play an important role in catalyst activity.

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