Site-specific catalytic activities to facilitate solvent-free aerobic oxidation of cyclohexylamine to cyclohexanone oxime over highly efficient Nb-modified SBA-15 catalysts

2020 ◽  
Vol 10 (10) ◽  
pp. 3409-3422
Author(s):  
Wei Ding ◽  
Haoyu Peng ◽  
Wenzhou Zhong ◽  
Liqiu Mao ◽  
Dulin Yin
Keyword(s):  
Heterogeneous Catalysts ◽  
Aerobic Oxidation ◽  
Solvent Free ◽  
Cyclohexanone Oxime ◽  
Site Specific ◽  
Catalytic Activities ◽  
Highly Efficient ◽  
Highly Active ◽  
Nitrogen Center ◽  
Highly Sensitive

The development of highly active and selective heterogeneous catalysts for efficient oxidation of cyclohexylamine to cyclohexanone oxime is a challenge associated with the highly sensitive nitrogen center of cyclohexylamine.

Practical organic solvent-free Cu(OAc)2/DMAP/TEMPO-catalyzed aldehyde and imine formation from alcohols under air atmosphere

RSC Advances ◽  
2014 ◽  
Vol 4 (90) ◽  
pp. 48777-48782 ◽  
Author(s):  
Mingyu Guan ◽  
Chao Wang ◽  
Jingyu Zhang ◽  
Yingsheng Zhao
Keyword(s):  
Organic Solvent ◽  
Aerobic Oxidation ◽  
Ambient Air ◽  
Catalyst System ◽  
Solvent Free ◽  
Allylic Alcohols ◽  
Highly Efficient ◽  
Air Atmosphere ◽  
Selective Aerobic Oxidation

A highly efficient and practical organic solvent-free Cu(OAc)2/DMAP/TEMPO catalyst system for the selective aerobic oxidation of benzylic and allylic alcohols to aldehydes and phenones under an ambient air atmosphere was reported.

Hollow-structured Si/SiC@C nanospheres as highly active catalysts for cycloaddition of epoxides with CO2 under mild conditions

2016 ◽  
Vol 45 (6) ◽  
pp. 2369-2373 ◽  
Author(s):  
Mei-Pin Liu ◽  
Yan-Ping Luo ◽  
Lei Xu ◽  
Lin Sun ◽  
Hong-Bin Du
Keyword(s):  
Solvent Free ◽  
Chemical Fixation ◽  
Magnesiothermic Reduction ◽  
Catalytic Activities ◽  
Mild Conditions ◽  
Highly Active ◽  
Solvent Free Conditions

Hollow-structured Si/SiC@C nanospheres, prepared through magnesiothermic reduction, exhibit excellent catalytic activities for chemical fixation of CO2 under mild, solvent-free conditions.

Silylated MgAl LDHs intercalated with MnO2 nanowires: Highly efficient catalysts for the solvent-free aerobic oxidation of ethylbenzene

2015 ◽  
Vol 263 ◽  
pp. 309-316 ◽  
Author(s):  
Wenmiao Lv ◽  
Lei Yang ◽  
Binbin Fan ◽  
Yuan Zhao ◽  
Yanfeng Chen ◽  
...  
Keyword(s):  
Aerobic Oxidation ◽  
Solvent Free ◽  
Highly Efficient ◽  
Oxidation Of Ethylbenzene ◽  
Mno2 Nanowires

scholarly journals Fe3+-Exchanged Titanate Nanotubes: A New Kind of Highly Active Heterogeneous Catalyst for Friedel-Crafts Type Benzylation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Yunchen Du ◽  
Di Guo ◽  
Meiling Xiong ◽  
Yanwu Qi ◽  
Chenkui Cui ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Heterogeneous Catalysts ◽  
Catalyst Support ◽  
Environmental Benefits ◽  
Titanate Nanotubes ◽  
Catalytic Activities ◽  
Highly Active ◽  
Active Metal ◽  
Benzylation Of Benzene

Heterogeneous catalysis for Friedel-Crafts type benzylation has received much attention in recent years due to its characteristic of environmental benefits. In this paper, titanate nanotubes (TNTs) were employed as heterogeneous catalyst support, and a new kind of Fe3+-exchanged titanate nanotubes (Fe-TNTs) catalyst with highly dispersed ferric sites was constructed by an ion exchange technique. The obtained catalyst was systematically characterized by XRD, TEM, N2adsorption, XPS, and UV-vis spectra. As expected, Fe-TNTs showed excellent catalytic activities in the benzylation of benzene and benzene derivatives. The recycling tests for Fe-TNTs were also carried out, where the reason for the gradually decreased activity was carefully investigated. Superior to some reported catalysts, the catalytic ability of used Fe-TNTs could be easily recovered by ion exchange again, indicating that Fe-TNTs herein were a highly active and durable heterogeneous catalyst for Friedel-Crafts type benzylation. These results might be helpful for the design and preparation of novel heterogeneous catalysts by combining the structural advantages of titanate nanotubes and active metal ions.

scholarly journals Hydroboration of nitriles and imines by highly active zinc dihydride catalysts

RSC Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 1128-1133
Author(s):  
Xiaoming Wang ◽  
Xin Xu
Keyword(s):  
Room Temperature ◽  
Solvent Free ◽  
Highly Efficient ◽  
Highly Active ◽  
Solvent Free Conditions

Molecular zinc dihydrides were found to be highly efficient catalysts for the hydroboration of nitriles and imines at room temperature under solvent-free conditions.

scholarly journals The Low Temperature Solvent-Free Aerobic Oxidation of Cyclohexene to Cyclohexane Diol over Highly Active Au/Graphite and Au/Graphene Catalysts

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 311 ◽  
Author(s):  
Owen Rogers ◽  
Samuel Pattisson ◽  
Joseph Macginley ◽  
Rebecca Engel ◽  
Keith Whiston ◽  
...  
Keyword(s):  
Low Temperature ◽  
Aerobic Oxidation ◽  
Gold Catalysts ◽  
Solvent Free ◽  
Reaction Conditions ◽  
Co Catalyst ◽  
Radical Initiator ◽  
Highly Active ◽  
Number Of Factors

The selectivity and activity of gold-catalysts supported on graphite and graphene have been compared in the oxidation of cyclohexene. These catalysts were prepared via impregnation and sol immobilisation methods, and tested using solventless and radical initiator-free reaction conditions. The selectivity of these catalysts has been directed towards cyclohexene epoxide using WO3 as a co-catalyst and further to cyclohexane diol by the addition of water, achieving a maximum selectivity of 17% to the diol. The sol immobilisation catalysts were more reproducible and far more active, however, selectivity towards the diol was lower than for the impregnation catalyst. The results suggest that formation of cyclohexane diol through solventless oxidation of cyclohexene is limited by a number of factors, such as the formation of an allylic hydroperoxyl species as well as the amount of in situ generated water.

Polymer grafted layered double hydroxides (LDHs-g-POEGMA): a highly efficient reusable solid catalyst for the synthesis of chromene incorporated dihydroquinoline derivatives under solvent-free conditions

2016 ◽  
Vol 18 (15) ◽  
pp. 4228-4239 ◽  
Author(s):  
Mudumala Veeranarayana Reddy ◽  
Nguyen Thi Kim Lien ◽  
Gangireddy Chandra Sekhar Reddy ◽  
Kwon Taek Lim ◽  
Yeon Tae Jeong
Keyword(s):  
Layered Double Hydroxides ◽  
Solvent Free ◽  
Solid Catalyst ◽  
Highly Efficient ◽  
Highly Active ◽  
Solvent Free Conditions ◽  
Green Procedure ◽  
Double Hydroxides

Chromene incorporated dihydroquinolines are synthesized using highly active air stable and recyclable LDHs-g-POEGMA as catalyst in green procedure.

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