Synthesis, characterization and catalytic epoxidation properties of a new tellurotungstate(iv)-supported rhenium carbonyl derivative

2019 ◽  
Vol 48 (2) ◽  
pp. 628-634 ◽  
Author(s):  
Jingkun Lu ◽  
Xinyi Ma ◽  
Ping Wang ◽  
Junwei Feng ◽  
Pengtao Ma ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Conditions ◽  
Carbonyl Derivative ◽  
Catalytic Epoxidation ◽  
Rhenium Carbonyl ◽  
Epoxidation Of Alkenes

We synthesized a new tellurotungstate(iv)-supported rhenium carbonyl derivative, Na2H2[(CH3)4N]6[Te2W20O70{Re(CO)3}2]·20H2O (1). Additionally, compound 1 showed excellent catalytic activity in the selective epoxidation of alkenes under comparatively mild reaction conditions.

An isotetramolybdate-supported rhenium carbonyl derivative: synthesis, characterization, and use as a catalyst for sulfoxidation

2018 ◽  
Vol 47 (15) ◽  
pp. 5279-5285 ◽  
Author(s):  
Jingkun Lu ◽  
Xinyi Ma ◽  
Vikram Singh ◽  
Yujiao Zhang ◽  
Pengtao Ma ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
Reaction Conditions ◽  
Carbonyl Derivative ◽  
Oxidation Of Sulfides ◽  
Rhenium Carbonyl

We successfully synthesized an isotetramolybdate-supported rhenium carbonyl derivative, [(CH3)4N]4[{Re(CO)3}4(Mo4O16)]·H2O, which showed excellent catalytic activity in the selective oxidation of sulfides under comparatively mild reaction conditions.

scholarly journals Ring-Opening Copolymerization of Cyclohexene Oxide and Cyclic Anhydrides Catalyzed by Bimetallic Scorpionate Zinc Catalysts

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1651
Author(s):  
Felipe de la Cruz-Martínez ◽  
Marc Martínez de Sarasa Buchaca ◽  
Almudena del Campo-Balguerías ◽  
Juan Fernández-Baeza ◽  
Luis F. Sánchez-Barba ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Mechanism ◽  
Catalytic System ◽  
Phthalic Anhydride ◽  
Ring Opening ◽  
High Selectivity ◽  
Zinc Complexes ◽  
Cyclohexene Oxide ◽  
Reaction Conditions ◽  
Cyclic Anhydrides

The catalytic activity and high selectivity reported by bimetallic heteroscorpionate acetate zinc complexes in ring-opening copolymerization (ROCOP) reactions involving CO2 as substrate encouraged us to expand their use as catalysts for ROCOP of cyclohexene oxide (CHO) and cyclic anhydrides. Among the catalysts tested for the ROCOP of CHO and phthalic anhydride at different reaction conditions, the most active catalytic system was the combination of complex 3 with bis(triphenylphosphine)iminium as cocatalyst in toluene at 80 °C. Once the optimal catalytic system was determined, the scope in terms of other cyclic anhydrides was broadened. The catalytic system was capable of copolymerizing selectively and efficiently CHO with phthalic, maleic, succinic and naphthalic anhydrides to afford the corresponding polyester materials. The polyesters obtained were characterized by spectroscopic, spectrometric, and calorimetric techniques. Finally, the reaction mechanism of the catalytic system was proposed based on stoichiometric reactions.

Characterization and Catalytic Activity of Poly(4-Vinylpyridine-Co-Divinylbenzene)-Co2+ Complex

2005 ◽  
Vol 494 ◽  
pp. 363-368 ◽  
Author(s):  
D. Lončarević ◽  
Ž. Čupić
Keyword(s):  
Catalytic Activity ◽  
Molecular Level ◽  
Supported Catalysts ◽  
Lone Pair ◽  
Polymer Support ◽  
Polymeric Complex ◽  
Reaction Conditions ◽  
Pyridine Nitrogen ◽  
Nitrogen Lone Pair ◽  
Thermal Stability Of

Poly(4-vinylpyridine-co-divinylbenzene)-Co2+ was characterized using infrared spectroscopy (IR), thermogravimetric analysis (TG-DTA), N2-physisorption and polarography. Thermal analysis suggests sufficient thermal stability of the polymer support, under reaction conditions. From polarography measurements, the Co2+ content on polymer-supported catalysts is estimated and it was proved that no significant leaching occurred during the activity tests. At the molecular level, FTIR of P4VP-DVB-Co2+ reveals that the pyridine nitrogen lone pair coordinates to the metal center in the polymeric complex. The obtained P4VP-DVB-Co2+ catalysts performed interesting catalytic activity in reaction of the cyclohexane oxidation with air, indicating that increasing Co2+ content lowers the initiation temperature and raises the decomposition of cyclohexylhydroperoxide.

Synthesis and catalytic activity of rhenium carbonyl complexes containing alkyl-substituted tetramethylcyclopentadienyl ligands

2017 ◽  
Vol 42 (2) ◽  
pp. 137-144 ◽  
Author(s):  
Zhan-Wei Li ◽  
Zhi-Hong Ma ◽  
Su-Zhen Li ◽  
Zhan-Gang Han ◽  
Xue-Zhong Zheng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Complexes ◽  
Rhenium Carbonyl

scholarly journals Effect of Mg Contents on Catalytic Activity and Coke Formation of Mesoporous Ni/Mg-Aluminate Spinel Catalyst for Steam Methane Reforming

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 828 ◽  
Author(s):  
Hyunjoung Kim ◽  
Young-Hee Lee ◽  
Hongjin Lee ◽  
Jeong-Cheol Seo ◽  
Kyubock Lee
Keyword(s):  
Catalytic Activity ◽  
Coke Formation ◽  
Coke Deposition ◽  
Methane Reforming ◽  
Reaction Conditions ◽  
Ni Catalysts ◽  
Steam Methane Reforming ◽  
Steam Methane ◽  
Spinel Catalysts ◽  
Mg Content

Ni catalysts are most suitable for a steam methane reforming (SMR) reaction considering the activity and the cost, although coke formation remains the main problem. Here, Ni-based spinel catalysts with various Mg contents were developed through the synthesis of mesoporous Mg-aluminate supports by evaporation-induced self-assembly followed by Ni loading via incipient wetness impregnation. The mesoporous Ni/Mg-aluminate spinel catalysts showed high coke resistance under accelerated reaction conditions (0.0014 gcoke/gcat·h for Ni/Mg30, 0.0050 gcoke/gcat·h for a commercial catalyst). The coke resistance of the developed catalyst showed a clear trend: the higher the Mg content, the lower the coke deposition. The Ni catalysts with the lower Mg content showed a higher surface area and smaller Ni particle size, which originated from the difference of the sintering resistance and the exsolution of Ni particles. Despite these advantageous attributes of Ni catalysts, the coke resistance was higher for the catalysts with the higher Mg content while the catalytic activity was dependent on the reaction conditions. This reveals that the enhanced basicity of the catalyst could be the major parameter for the reduction of coke deposition in the SMR reaction.

Catalytic Synthesis of Benzyl Acetate by Diatomite Supported Waugh-Type (NH4)6[MnMo9O32] •8H2O

2013 ◽  
Vol 483 ◽  
pp. 38-41
Author(s):  
Shu Heng Liu
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Reaction Time ◽  
Catalytic Synthesis ◽  
Orthogonal Test ◽  
Solid Catalyst ◽  
High Catalytic Activity ◽  
Benzyl Acetate ◽  
Reaction Conditions ◽  
Catalyst Dosage

Take Waugh-Type (NH4)6[MnMo9O32] •8H2O absorbed on diatomite and prepared supported solid catalyst. The properties of the catalyst were studied through the synthesis of benzyl acetate. The appropriate reaction conditions were obtained by orthogonal test: mole ratio of acetic acid to benzyl alcohol was 2.5:1.0, the catalyst dosage was 1.6g, the water carrying agent toluene dosage was 2.5ml, reaction time was 150min, esterification yield was 87.4%. The catalyst are high catalytic activity and non- polluting, and could be reused.

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