scholarly journals Stable Non-Covalent Co(Salphen)-Based Polymeric Catalyst for Highly Efficient and Selective Oxidation of 2,3,6-Trimethylphenol

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1076
Author(s):  
Weijie Zhang ◽  
Lingling Hu ◽  
He Zhang ◽  
Chunyue Pan ◽  
Juntao Tang
Keyword(s):  
Cost Effective ◽  
Catalytic Performance ◽  
Oxidation Reactions ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Catalyst Systems ◽  
Polymeric Catalyst ◽  
Substantial Decline ◽  
Excellent Stability

Developing highly efficient catalyst systems for phenol–quinone transformation is of great significance in the chemical/biological industries. Herein, we reported a novel heterogenous catalytic system based on Co(Salphen) supramolecular polymers (CSP), which delivered an excellent catalytic performance in the oxidation of 2,3,6-trimethylphenol (TMP) under mild conditions. The CSP were constructed through a simple self-assembled process between BiCo(Salphen) complex and 4,4-dipyridine. By applying BiCo-BiPy1:1 CSP as the catalyst, 2,3,5-trimethyl-1,4-benzoquinone (TMBQ) could be obtained with an excellent conversion (>99%) and selectivity over 99% under mild reaction conditions (30 °C, 0.1 MPa). In addition, it can be recycled at least five times without substantial decline in catalytic activities (conversion and selectivity), suggesting its excellent stability and recyclability. This work may provide guidance on designing and building valuable catalysts for environmentally friendly and cost-effective oxidation reactions.

Highly Efficient Catalyst Systems Using Iron Complexes with a Tetradentate PNNP Ligand for the Asymmetric Hydrogenation of Polar Bonds

2008 ◽  
Vol 120 (5) ◽  
pp. 954-957 ◽  
Author(s):  
Christine Sui-Seng ◽  
Friederike Freutel ◽  
Alan J. Lough ◽  
Robert H. Morris
Keyword(s):  
Asymmetric Hydrogenation ◽  
Iron Complexes ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Catalyst Systems

CO2 fixation at atmospheric pressure: porous ZnSnO3 nanocrystals as a highly efficient catalyst for the synthesis of cyclic carbonates

RSC Advances ◽  
2016 ◽  
Vol 6 (37) ◽  
pp. 31153-31160 ◽  
Author(s):  
Susmita Roy ◽  
Biplab Banerjee ◽  
Asim Bhaumik ◽  
Sk. Manirul Islam
Keyword(s):  
Atmospheric Pressure ◽  
Co2 Fixation ◽  
Cyclic Carbonates ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Zinc Stannate ◽  
Highly Efficient ◽  
Self Assembled

Self-assembled, ultra small, porous zinc stannate nanocrystals have been synthesized, which catalyzes the formation of cyclic carbonates from various epoxide and CO2 under very mild reaction conditions.

Novel approach for a cerium-based highly-efficient catalyst with excellent NH3-SCR performance

2014 ◽  
Vol 4 (10) ◽  
pp. 3611-3614 ◽  
Author(s):  
Haili Huang ◽  
Wenpo Shan ◽  
Shijian Yang ◽  
Jinhua Zhang
Keyword(s):  
Low Temperature ◽  
Catalytic Performance ◽  
Efficient Catalyst ◽  
Scr Catalyst ◽  
Highly Efficient ◽  
Nh3 Scr ◽  
Novel Approach ◽  
Operational Temperature ◽  
Temperature Window ◽  
Excellent Catalytic Performance

A highly-efficient NH3-SCR catalyst, CeO2/WO3–TiO2, was prepared by a novel stepwise precipitation approach. This catalyst showed excellent catalytic performance with superior low-temperature activity, high N2 selectivity and a broad operational temperature window.

scholarly journals Novel Ni/MgO Catalysts from Mesoporous MgCO3 for Highly Efficient CO Methanation: Effects of Al and Si Stabilization

2020 ◽  
Author(s):  
Wenming Hao ◽  
Maria Vall ◽  
Yufei Shi ◽  
Qianqian Wang ◽  
Maria Strømme ◽  
...  
Keyword(s):  
Natural Gas ◽  
High Selectivity ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Magnesium Carbonate ◽  
Co Methanation ◽  
Synthetic Natural Gas ◽  
Effective Catalyst ◽  
Highly Efficient ◽  
Co Conversion

Methanation of syngas is a possible way to produce synthetic natural gas. Ni has been proven to be a good and cost-effective catalyst for this reaction. Here we have synthesized Ni/MgO catalyst using mesoporous magnesium carbonate (MMC) as a precursor. Addition of Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> to MMC were made and the different MMC based materials were then impregnated with Ni(NO<sub>3</sub>)<sub>2</sub> and calcined to generate the catalysts. Addition of Al<sub>2</sub>O<sub>3</sub> showed an improvement in the catalytic performance compared to the NiO/MgO catalyst. The catalyst containing Al<sub>2</sub>O<sub>3</sub> had a CO conversion close to 100 % at 350 °C and a high selectivity and yield for CH<sub>4</sub>. The better performance of the aluminum containing catalyst was believed to be an effect of a better dispersion of Ni at the surface of the catalyst<br>

Al(OTf)3 — A highly efficient catalyst for the tetrahydropyranylation of alcohols under solvent-free conditions

2008 ◽  
Vol 86 (12) ◽  
pp. 1099-1104 ◽  
Author(s):  
Ahmed Kamal ◽  
M Naseer A Khan ◽  
Y VV Srikanth ◽  
K Srinivasa Reddy
Keyword(s):  
Comparative Study ◽  
Efficient Method ◽  
Catalytic Amount ◽  
Solvent Free ◽  
Molar Ratio ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Solvent Free Conditions ◽  
The Comparative Study

A simple and highly efficient method has been developed for the tetrahydropyranylation of alcohols by their reaction with 3,4-dihydro-2H-pyran (DHP) using a catalytic amount (0.01–1 mol%) of aluminium triflate under solvent-free conditions. The effect of various factors like temperature, amount of the catalyst, and molar ratio of substrates on the reaction conditions has also been studied. The comparative study of tetrahydropyranylation of benzyl alcohol using various catalysts including some reported ones shows the efficiency of this catalyst.Key words: tetrahydropyranylation, aluminium triflate, alcohols, catalysis.

Pd/ZrO2: An Efficient Catalyst for Liquid Phase Oxidation of Toluene in Solvent Free Conditions

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
Mohsin Siddique ◽  
Muhammad Saeed ◽  
Mohammad Ilyas ◽  
Hussain Gulab
Keyword(s):  
Batch Reactor ◽  
Catalytic Efficiency ◽  
Catalytic Performance ◽  
Solvent Free ◽  
Catalyst Loading ◽  
Similar Reaction ◽  
Reaction Conditions ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Free Oxidation

Abstract 0.1 % Pd/ZrO2 was synthesized and characterized by various physicochemical techniques and was successfully used as catalyst for solvent free oxidation of toluene in the presence of molecular oxygen using batch reactor. The catalytic performance of Pd/ZrO2 was explored in terms of effect of catalyst loading, reaction time, temperature and partial pressure of oxygen on oxidation of toluene in solvent free conditions. Pd/ZrO2 was found as a stable catalyst under the reaction conditions. Used catalyst exhibited the same catalytic efficiency as fresh catalyst under similar reaction conditions. Reaction was taking place according to Langmuir-Hinshelwood type of mechanism.

Water mediated economical synthesis of chromeno[b]pyridin-3-yl cyanides using cadmium oxide nanoparticles as a highly efficient catalyst

2020 ◽  
Vol 98 (8) ◽  
pp. 415-420 ◽  
Author(s):  
Saman Dahi-Azar ◽  
Shahrzad Abdolmohammadi ◽  
Javad Mokhtari
Keyword(s):  
Aqueous Medium ◽  
Cadmium Oxide ◽  
Aromatic Aldehydes ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Significant Difference ◽  
Cyclocondensation Reaction ◽  
Efficient Heterogeneous Catalyst

A simple, practical, and economical protocol for the synthesis of a series of twelve 2-amino-5-oxo-4-aryl-5H-chromeno[4,3-b]pyridin-3-yl cyanides have been developed by the cyclocondensation reaction of 4-aminocoumarin, aromatic aldehydes, and malononirile in the presence of cadmium oxide nanoparticles (CdO NPs) as an cost-effective, reusable, and highly efficient heterogeneous catalyst in aqueous medium at 60 °C. The procedure is very simple, clean, mild, and practical for aromatic, as well as heteroaromatic, aldehydes without significant difference.

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