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.

Hollow structured CoSn(OH)6-supported Pt for effective room-temperature oxidation of gaseous formaldehyde

2016 ◽  
Vol 09 (06) ◽  
pp. 1642009 ◽  
Author(s):  
Jing Zhou ◽  
Yong Zhao ◽  
Lifan Qin ◽  
Chen Zeng ◽  
Wei Xiao
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Synergetic Effect ◽  
Hollow Structure ◽  
Pt Nanoparticles ◽  
Hydroxyl Groups ◽  
High Catalytic Activity ◽  
Temperature Oxidation ◽  
X Ray

Uniform CoSn(OH)6 hollow nanoboxes and the derivative with Pt loading (Pt/CoSn(OH)6) were herein synthesized and characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). SEM and TEM analyses showed that CoSn(OH)6 possessed mesoporous hollow structure and Pt nanoparticles with size of 2–8[Formula: see text]nm were uniformly dispersed on the surface of CoSn(OH)6 nanoboxes. The performances of the catalysts for the formaldehyde (HCHO) removal at room temperature were evaluated. These Pt/CoSn(OH)6 catalysts exhibited a remarkable catalytic activity as well as stability for room-temperature oxidative decomposition of gaseous HCHO, while the corresponding CoSn(OH)6 only showed adsorption. The synergetic effect between the highly dispersed Pt nanoparticles and the CoSn(OH)6 nanoboxes with mesoporous hollow structure, a large surface area and abundant surface hydroxyl groups is considered to be the main reason for the observed high catalytic activity of Pt/CoSn(OH)6.

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.

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.

Hollow porous Cu–Au particles with high catalytic activity for the reduction of 4-nitrophenol

CrystEngComm ◽  
2020 ◽  
Vol 22 (26) ◽  
pp. 4386-4392
Author(s):  
Jianwei Jiang ◽  
Sungho Yoon ◽  
Longhai Piao
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
Electrocatalytic Activity ◽  
Hollow Structure ◽  
High Catalytic Activity

A Cu-based bimetallic hollow structure can be effectively used to enhance the selective oxidation and electrocatalytic activity of a catalyst and to reduce its cost.

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.

The Preparation and Characterization of Carbon Nanostructures Catalyst and its Catalytic Activity

2011 ◽  
Vol 418-420 ◽  
pp. 629-632
Author(s):  
Huan Ying Li ◽  
Shu Li Bai ◽  
Wen Ping Jia ◽  
Fang Li
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanostructures ◽  
Catalytic Properties ◽  
Catalytic Reduction ◽  
Catalyst Support ◽  
High Catalytic Activity ◽  
Single Structure ◽  
Catalytic Functions ◽  
Pure Surface

In this work, the constructing of different carbon nanostructures materials were studied, and the single-structure and pure surface of carbon nanostructures were employed to as catalyst support and the morphology and structure of different carbon nanostructures-based catalysts were investigated. NO catalytic reduction was used as a probe reaction to investigate the catalytic properties of different carbon nanostructures materials and how the controlling of carbon nanostructures would affect its catalytic functions. The results show that vanadium was molecularly anchored on the surface of carbon nanostructures and the mesh-carbon nanotubes as a support show a high catalytic activity.

Sign in / Sign up

Export Citation Format

Share Document