Fabrication of magnetically separable ruthenium nanoparticles decorated on channelled silica microspheres: Efficient catalysts for chemoselective hydrogenation of nitroarenes

2021 ◽  
Author(s):  
Gauravjyoti D. Kalita ◽  
Manash R. Das ◽  
Pankaj Das
Keyword(s):  
Catalytic Performance ◽  
Ruthenium Nanoparticles ◽  
Silica Microspheres ◽  
Chemoselective Hydrogenation ◽  
Magnetically Separable

Magnetic mesoporous Ru nanoparticle decorated catalysts equipped with nanochannels for chemoselective hydrogenation of nitroarenes to amine: influence of nano-channeling on catalytic performance.

Size-dependent catalytic performance of ruthenium nanoparticles in the hydrogenolysis of a β-O-4 lignin model compound

2018 ◽  
Vol 8 (3) ◽  
pp. 735-745 ◽  
Author(s):  
Lin Dong ◽  
Li-Li Yin ◽  
Qineng Xia ◽  
Xiaohui Liu ◽  
Xue-Qing Gong ◽  
...  
Keyword(s):  
Model Compound ◽  
Catalytic Performance ◽  
Ruthenium Nanoparticles ◽  
One Pot ◽  
Lignin Model Compound ◽  
Size Dependent ◽  
Lignin Model

One-pot depolymerization of lignin to well-defined chemicals and their further deoxygenation to arenes are extremely attractive.

scholarly journals Synthesis of Hollow Flower-Like Fe3O4/MnO2/Mn3O4 Magnetically Separable Microspheres with Valence Heterostructure for Dye Degradation

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 589 ◽  
Author(s):  
Mingliang Ma ◽  
Yuying Yang ◽  
Yan Chen ◽  
Fei Wu ◽  
Wenting Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Organic Contaminants ◽  
Dye Degradation ◽  
Catalytic Performance ◽  
X Ray ◽  
Composite Microspheres ◽  
Magnetically Separable ◽  
Mno2 Nanosheet

In this manuscript, hollow flower-like ferric oxide/manganese dioxide/trimanganese tetraoxide (Fe3O4/MnO2/Mn3O4) magnetically separable microspheres were prepared by combining a simple hydrothermal method and reduction method. As the MnO2 nanoflower working as precursor was partially reduced, Mn3O4 nanoparticles were in situ grown from the MnO2 nanosheet. The composite microspheres were characterized in detail by employing scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), vibration sample magnetometer (VSM) and UV–visible spectrophotometer (UV–vis). Under visible light conditions, the test for degrading rhodamine B (RhB) was used to verify the photocatalytic activity of the photocatalyst. The results showed that the efficiency of the Fe3O4/MnO2/Mn3O4 photocatalyst in visible light for 130 min is 94.5%. The catalytic activity of photocatalyst far exceeded that of the Fe3O4/MnO2 component, and after four cycles, the catalytic performance of the catalyst remained at 78.4%. The superior properties of the photocatalyst came from improved surface area, enhanced light absorption, and efficient charge separation of the MnO2/Mn3O4 heterostructure. This study constructed a green and efficient valence heterostructure composite that created a promising photocatalyst for degrading organic contaminants in aqueous environments.

scholarly journals MOF-derived Ni-based nanocomposites as robust catalysts for chemoselective hydrogenation of functionalized nitro compounds

RSC Advances ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 1531-1539 ◽  
Author(s):  
Bo Tang ◽  
Wei-Chao Song ◽  
En-Cui Yang ◽  
Xiao-Jun Zhao
Keyword(s):  
Catalytic Performance ◽  
Nitro Compounds ◽  
Graphitic Carbon ◽  
Ni Nanoparticles ◽  
Chemoselective Hydrogenation ◽  
Highly Dispersed

Highly dispersed Ni nanoparticles within graphitic carbon layers were prepared by facile thermolysis of a Ni-MOF, which exhibited outstanding catalytic performance in the chemoselective hydrogenation of diverse functionalized nitro compounds.

Copper nanoparticles socketed in situ into copper phyllosilicate nanotubes with enhanced performance for chemoselective hydrogenation of esters

2017 ◽  
Vol 53 (51) ◽  
pp. 6933-6936 ◽  
Author(s):  
Xiaoxiao Gong ◽  
Meiling Wang ◽  
Huihuang Fang ◽  
Xiaoqi Qian ◽  
Linmin Ye ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Selective Hydrogenation ◽  
Elevated Temperatures ◽  
Catalytic Performance ◽  
Reducing Atmosphere ◽  
Chemoselective Hydrogenation ◽  
Excellent Catalytic Performance

Copper nanoparticles exsoluted in situ under a reducing atmosphere at elevated temperatures are socketed into the parent copper phyllosilicate nanotubes and exhibit excellent catalytic performance and superior stability for the selective hydrogenation of various esters to alcohols.

scholarly journals Gold catalysts containing interstitial carbon atoms boost hydrogenation activity

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yafei Sun ◽  
Yueqiang Cao ◽  
Lili Wang ◽  
Xiaotong Mu ◽  
Qingfei Zhao ◽  
...  
Keyword(s):  
Gold Catalyst ◽  
Catalytic Performance ◽  
Activation Entropy ◽  
Hydrogenation Activity ◽  
Noble Metal Catalysts ◽  
Heterogeneous Catalytic ◽  
Chemoselective Hydrogenation ◽  
Heterolytic Dissociation ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

Abstract Supported gold nanoparticles are emerging catalysts for heterogeneous catalytic reactions, including selective hydrogenation. The traditionally used supports such as silica do not favor the heterolytic dissociation of hydrogen on the surface of gold, thus limiting its hydrogenation activity. Here we use gold catalyst particles partially embedded in the pore walls of mesoporous carbon with carbon atoms occupying interstitial sites in the gold lattice. This catalyst allows improved electron transfer from carbon to gold and, when used for the chemoselective hydrogenation of 3-nitrostyrene, gives a three times higher turn-over frequency (TOF) than that for the well-established Au/TiO2 system. The d electron gain of Au is linearly related to the activation entropy and TOF. The catalyst is stable, and can be recycled ten times with negligible loss of both reaction rate and overall conversion. This strategy paves the way for optimizing noble metal catalysts to give an enhanced hydrogenation catalytic performance.

Tuning the chemoselective hydrogenation of aromatic ketones, aromatic aldehydes and quinolines catalyzed by phosphine functionalized ionic liquid stabilized ruthenium nanoparticles

2015 ◽  
Vol 5 (7) ◽  
pp. 3728-3734 ◽  
Author(s):  
He-yan Jiang ◽  
Xu-xu Zheng
Keyword(s):  
Ionic Liquid ◽  
Aromatic Aldehydes ◽  
Ruthenium Nanoparticles ◽  
Aromatic Ketones ◽  
Functionalized Ionic Liquid ◽  
Mild Conditions ◽  
Chemoselective Hydrogenation

Aromatic ketones, aromatic aldehydes and quinolines can be hydrogenated with switchable excellent chemoselectivity under mild conditions catalyzed by ruthenium nanoparticles.

Porous hollow manganites with robust composite shells for oxidation of CO at low temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 113682-113688 ◽  
Author(s):  
Jung Bo Yoo ◽  
Sora Bang ◽  
Kyungtae Kim ◽  
Chengbin Li ◽  
Ji Man Kim ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Catalytic Performance ◽  
Thermal Hydrolysis ◽  
Composite Shells ◽  
Oxidation Of Co ◽  
Silica Microspheres ◽  
Hydrolysis Of ◽  
Hydrolysis Of Urea

Hollow-type manganite-coated silica microspheres were synthesized via the thermal hydrolysis of urea. The Mn2O3/SiO2_3T microspheres with robust shells exhibit best catalytic performance for CO oxidation even at temperatures below 200 °C.

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