An unsaturated metal site-promoted approach to construct strongly coupled noble metal/HNb3O8 nanosheets for efficient thermo/photo-catalytic reduction

Nanoscale ◽  
2017 ◽  
Vol 9 (38) ◽  
pp. 14654-14663 ◽  
Author(s):  
Lijuan Shen ◽  
Yuzhou Xia ◽  
Sen Lin ◽  
Shijing Liang ◽  
Ling Wu
Keyword(s):  
Noble Metal ◽  
Catalytic Reduction ◽  
Reducing Agent ◽  
Capping Agent ◽  
Strongly Coupled ◽  
Metal Site

A Nb4+-promoted approach has been developed to construct Pd/HNb3O8 without a reducing agent or a capping agent. The resulting composites function as efficient thermo/photo-catalysts.

scholarly journals Poly(N-isopropylacrylamide-co-methacrylic acid) microgel stabilized copper nanoparticles for catalytic reduction of nitrobenzene

2015 ◽  
Vol 33 (3) ◽  
pp. 627-634 ◽  
Author(s):  
Zahoor H. Farooqi ◽  
Zonarah Butt ◽  
Robina Begum ◽  
Shanza Rhauf Khan ◽  
Ahsan Sharif ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Methacrylic Acid ◽  
Catalytic Reduction ◽  
Aqueous Media ◽  
Activation Parameters ◽  
Reducing Agent ◽  
Different Temperatures ◽  
Entropy Of Activation ◽  
Micro Reactors

Abstract Poly(N-isopropylacrylamide-co-methacrylic acid) microgels [p(NIPAM-co-MAAc)] were synthesized by precipitation polymerization of N-isopropylacrylamide and methacrylic acid in aqueous medium. These microgels were characterized by dynamic light scattering and Fourier transform infrared spectroscopy. These microgels were used as micro-reactors for in situ synthesis of copper nanoparticles using sodium borohydride (NaBH4) as reducing agent. The hybrid microgels were used as catalysts for the reduction of nitrobenzene in aqueous media. The reaction was performed with different concentrations of cat­alyst and reducing agent. A linear relationship was found between apparent rate constant (kapp) and amount of catalyst. When the amount of catalyst was increased from 0.13 to 0.76 mg/mL then kapp was increased from 0.03 to 0.14 min-1. Activation parameters were also determined by performing reaction at two different temperatures. The catalytic process has been discussed in terms of energy of activation, enthalpy of activation and entropy of activation. The synthesized particles were found to be stable even after 14 weeks and showed catalytic activity for the reduction of nitrobenzene.

scholarly journals Novel continuous flow synthesis of Pt NPs with narrow size distribution for Pt@carbon catalysts

RSC Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 362-366
Author(s):  
Ankit Singh ◽  
Keiko Miyabayashi
Keyword(s):  
Size Distribution ◽  
Continuous Flow ◽  
Synthesis Method ◽  
Reducing Agent ◽  
Capping Agent ◽  
Narrow Size Distribution ◽  
Flow Synthesis ◽  
Carbon Catalysts

A novel continuous flow synthesis method was performed to achieve ultra-small Pt NPs (2.3 to 2.5 nm) with narrow size distribution. This method expedites the synthesis of Pt NPs without any harsh reducing agent or capping agent.

scholarly journals Critical review on the chemical reduction of nitroaniline

RSC Advances ◽  
2020 ◽  
Vol 10 (32) ◽  
pp. 19041-19058 ◽  
Author(s):  
Muhammad Imran Din ◽  
Rida Khalid ◽  
Zaib Hussain ◽  
Jawayria Najeeb ◽  
Ahsan Sahrif ◽  
...  
Keyword(s):  
Critical Review ◽  
Catalytic Reduction ◽  
Chemical Reduction ◽  
Reducing Agent

Schematic illustration of catalytic reduction of 4-NA in the presence of nanocatalysts and a reducing agent.

Gas-Phase Fragmentation Reactions of Keggin-Type {PW11O39M} (M = Rh, Ir, and Ru) Polyoxometalates as Fingerprints of the Ligands Attached at the Noble Metal Site

2014 ◽  
Vol 2014 (32) ◽  
pp. 5618-5624 ◽  
Author(s):  
Cristian Vicent ◽  
Sergey A. Adonin ◽  
Alexander V. Anyushin ◽  
Dmitry A. Mainichev ◽  
Maxim N. Sokolov
Keyword(s):  
Gas Phase ◽  
Noble Metal ◽  
Metal Site ◽  
Keggin Type ◽  
Fragmentation Reactions ◽  
Gas Phase Fragmentation

scholarly journals Optimization of sol-immobilized bimetallic Au–Pd/TiO 2 catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation

2020 ◽  
Vol 378 (2176) ◽  
pp. 20200057
Author(s):  
Khaled Alshammari ◽  
Yubiao Niu ◽  
Richard E. Palmer ◽  
Nikolaos Dimitratos
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalytic Reduction ◽  
Catalytic Performance ◽  
Reducing Agent ◽  
Wastewater Remediation ◽  
X Ray ◽  
Molar Ratios ◽  
Highly Active ◽  
Transmission Electron ◽  
Complementary Techniques

A sol-immobilization method is used to synthesize a series of highly active and stable Au x Pd 1− x /TiO 2 catalysts (where x  = 0, 0.13, 0.25, 0.5, 0.75, 0.87 and 1) for wastewater remediation. The catalytic performance of the materials was evaluated for the catalytic reduction of 4-nitrophenol, a model wastewater contaminant, using NaBH 4 as the reducing agent under mild reaction conditions. Reaction parameters such as substrate/metal and substrate/reducing agent molar ratios, reaction temperature and stirring rate were investigated. Structure-activity correlations were studied using a number of complementary techniques including X-ray powder diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. The sol-immobilization route provides very small Au–Pd alloyed nanoparticles, with the highest catalytic performance shown by the Au 0.5 Pd 0.5 /TiO 2 catalyst. This article is part of a discussion meeting issue ‘Science to enable the circular economy’.

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