Fast catalytic reduction of an azo dye by recoverable and reusable Fe3O4@PANI@Au magnetic composites

2014 ◽  
Vol 38 (9) ◽  
pp. 4566-4573 ◽  
Author(s):  
Ming Chen ◽  
Peipei Liu ◽  
Chengjiao Wang ◽  
Wenjie Ren ◽  
GuoWang Diao
Keyword(s):  
Catalytic Activity ◽  
Azo Dye ◽  
Catalytic Reduction ◽  
High Catalytic Activity ◽  
Magnetic Composites ◽  
Dye Reduction

Fe3O4@PANI@Au magnetic composites were fabricated and applied to catalyze azo dye reduction. This catalyst exhibited high catalytic activity, excellent recyclability and stability.

Remarkably high catalytic activity of the RuIII(edta)/H2O2 system towards degradation of the azo-dye Orange II

2011 ◽  
Vol 40 (40) ◽  
pp. 10473 ◽  
Author(s):  
Debabrata Chatterjee ◽  
Erika Ember ◽  
Ujjwal Pal ◽  
Sarita Ghosh ◽  
Rudi van Eldik
Keyword(s):  
Catalytic Activity ◽  
Azo Dye ◽  
High Catalytic Activity ◽  
Orange Ii ◽  
H2o2 System

Covalently functionalized carbon nanotube supported Pd nanoparticles for catalytic reduction of 4-nitrophenol

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6609-6616 ◽  
Author(s):  
Xianmo Gu ◽  
Wei Qi ◽  
Xianzhu Xu ◽  
Zhenhua Sun ◽  
Liyun Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Catalytic Reduction ◽  
Cycloaddition Reaction ◽  
Pd Nanoparticles ◽  
Dipolar Cycloaddition ◽  
High Catalytic Activity ◽  
Pd Nanoparticle ◽  
Supported Pd

Carbon nanotubes (CNTs) were covalently functionalized via 1,3-dipolar cycloaddition reaction under microwave conditions. Then Pd nanoparticle/CNT nanocomposites were fabricated through strong electronic adsorption and H2 reduction, which exhibited high catalytic activity.

Effect of Preparation Methods on Ti-PILCs Catalysts in Selective Catalytic Reduction of NO by Propylene

2014 ◽  
Vol 1033-1034 ◽  
pp. 90-94 ◽  
Author(s):  
Qi Ying Wang ◽  
Zi Li Liu ◽  
Jun Rong Wu
Keyword(s):  
Catalytic Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Active Species ◽  
Bet Surface Area ◽  
High Catalytic Activity ◽  
Incipient Wetness Impregnation ◽  
Distribution Analysis ◽  
Preparation Methods ◽  
Reduction Of No

Different Cu-loading pillared clays catalysts were studied in selective catalytic reduction of NO by propylene. The catalyst prepared by incipient wetness impregnation (Cu/Ti-PILCs) had better catalytic activity and stability than that prepared by ion-exchanged method (Cu-Ti-PILCs). Cu/Ti-PILCs has higher BET surface area than Cu-Ti-PILCs. Pore size distribution analysis and XRD showed that Cu species dispersed well in Cu/Ti-PILCs but formed conglomeration in Cu-Ti-PILCs. TPR showed that Cu2+ species were the main active species on the Cu/Ti-PILCs, which was responsible for the high catalytic activity of catalyst.

scholarly journals In Search of the Active Sites for the Selective Catalytic Reduction on Tungsten-Doped Vanadia Monolayer Catalysts supported by TiO2

2021 ◽  
Author(s):  
Mengru Li ◽  
Sung Sakong ◽  
Axel Gross
Keyword(s):  
Catalytic Activity ◽  
Selective Catalytic Reduction ◽  
Active Sites ◽  
Density Functional ◽  
Catalytic Reduction ◽  
Computational Study ◽  
Critical Role ◽  
Operating Conditions ◽  
High Catalytic Activity ◽  
Atomistic Structure

Tungsten-doped vanadia-based catalysts supported on anatase TiO<sub>2</sub> are used to reduce hazardous NO emissions through the selective catalytic reduction of ammonia, but their exact atomistic structure is still largely unknown. In this computational study, the atomistic structure of mixed tungsta-vanadia monolayers on TiO<sub>2</sub> support under typical operating conditions has been addressed by periodic density functional theory calculations. The chemical environment has been taken into account in a grand-canonical approach. We evaluate the stable catalyst structures as a function of the oxygen chemical potential and vanadium and tungsten concentrations. Thus we determine structural motifs of tungsta-vanadia/TiO<sub>2</sub> catalysts that are stable under operating conditions. Furthermore, we identify active sites that promise high catalytic activity for the selective catalytic reduction by ammonia. Our calculations reveal the critical role of the stoichiometry of the tungsta-vanadia layers with respect to their catalytic activity in the selective catalytic reduction.

SYNTHESIS OF Ni–Bi–P HOLLOW MICROSPHERES WITH OUTSTANDINGLY HIGH ACTIVITY TOWARD THE CATALYTIC REDUCTION OF p-NITROPHENOL

2019 ◽  
Vol 26 (05) ◽  
pp. 1850192
Author(s):  
XIANGRUI MENG ◽  
MEIFENG HAO ◽  
YIWEI JIANG ◽  
XIANGZHENYUE SUN ◽  
YAN WANG ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Reduction ◽  
Hollow Structure ◽  
Hollow Microspheres ◽  
High Catalytic Activity ◽  
P Elements ◽  
Composite Microspheres ◽  
Explosion Method ◽  
Space Limitation ◽  
Wet Explosion

A simple wet-explosion method was employed to synthesize the Ni–Bi–P composite microspheres. The hollow structure was obtained possibly due to the violent evolution of gas bubbles when the reaction reagents were mixed. The hollow microspheres of Ni–Bi–P exhibited outstanding high catalytic activity for the reduction of [Formula: see text]-nitrophenol ([Formula: see text]-NP) to form [Formula: see text]-aminophenol in the presence of NaBH4 within only 1[Formula: see text]s. Due to the space limitation, the hollow structure of Ni–Bi–P microspheres helps to accommodate and confine the molecules of NaBH4 and [Formula: see text]-NP within the small space where NaBH4 and [Formula: see text]-NP contact closely at Ni–Bi–P catalysts. The synergetic action of Ni, Bi and P elements also contributes the enhanced catalytic activity.

Ultra-small and recyclable zero-valent iron nanoclusters for rapid and highly efficient catalytic reduction of p-nitrophenol in water

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 1000-1010 ◽  
Author(s):  
Dongyang Shi ◽  
Guifen Zhu ◽  
Xiaodi Zhang ◽  
Xia Zhang ◽  
Xiang Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Reduction ◽  
Zero Valent Iron ◽  
High Catalytic Activity ◽  
Highly Efficient

Zero-valent iron nanoclusters with an ultrafine size have been prepared by a micelle-assisted process, and exhibit high catalytic activity and stability.

Au decorated Fe3O4@TiO2 magnetic composites with visible light-assisted enhanced catalytic reduction of 4-nitrophenol

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50454-50461 ◽  
Author(s):  
Ying Zhou ◽  
Yihua Zhu ◽  
Xiaoling Yang ◽  
Jianfei Huang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Noble Metal ◽  
Catalytic Reduction ◽  
Core Shell ◽  
Light Illumination ◽  
Magnetic Composites ◽  
Metal Catalysis ◽  
Visible Light Illumination

Multifunctional Fe3O4@TiO2@Au core–shell composites exhibited excellent catalytic activity for the reduction of 4-NP in the presence of NaBH4 under visible light illumination due to the synergy of noble metal-catalysis and photocatalysis.

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