scholarly journals A citric acid-assisted deposition strategy to synthesize mesoporous SiO2-confined highly dispersed LaMnO3 perovskite nanoparticles for n-butylamine catalytic oxidation

RSC Advances ◽  
2019 ◽  
Vol 9 (15) ◽  
pp. 8454-8462 ◽  
Author(s):  
Huawei Chen ◽  
Yanran Yang ◽  
Qing Liu ◽  
Mifen Cui ◽  
Xian Chen ◽  
...  
Keyword(s):  
Citric Acid ◽  
Catalytic Oxidation ◽  
Catalytic Performance ◽  
Highly Dispersed ◽  
Mesoporous Sio2 ◽  
Perovskite Nanoparticles

A citric acid-assisted deposition strategy was applied to synthesize mesoporous SiO2-confined highly dispersed LaMnO3 perovskite nanoparticles with optimum catalytic performance and N2 selectivity.

scholarly journals Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 243 ◽  
Author(s):  
Chao Sui ◽  
LeHong Xing ◽  
Xue Cai ◽  
Yang Wang ◽  
Qi Zhou ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Active Sites ◽  
Catalytic Performance ◽  
Strong Interactions ◽  
Synthesis Methods ◽  
Tem Analysis ◽  
Xps Spectra ◽  
Highly Dispersed ◽  
Co Catalytic Oxidation ◽  
Co Precipitation

Hydrothermal and co-precipitation methods were studied as two different methods for the synthesis of CeO2nanocatalysts. Co/CeO2 catalysts supported by 2, 4, 6, or 8wt% Co were further synthesized through impregnation and the performance of the catalytic oxidation of CO has been investigated. The highest specific surface area and the best catalytic performance was obtained by the catalyst 4wt% Co/CeO2 with the CeO2 support synthesized by the hydrothermal method (4% Co/CeO2-h), which yielded 100% CO conversion at 130 °C. The formation of CeO2 nanoparticles was confirmed by TEM analysis. XRD and SEM-EDX mapping analyses indicated that CoOx is highly dispersed on the 4% Co/CeO2-h catalyst surface. H2-TPR and O2-TPD results showed that 4% Co/CeO2-h possesses the best redox properties and the highest amount of chemically adsorbed oxygen on its surface among all tested catalysts. Raman and XPS spectra showed strong interactions between highly dispersed Co2+ active sites and exposed Ce3+ on the surface of the CeO2 support, resulting in the formation of the strong redox cycle Ce4+ + Co2+↔ Ce3+ + Co3+.This may explain that 4% Co/CeO2-h exhibited the best catalytic activity among all tested catalysts.

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

scholarly journals Highly dispersed Pt atoms and clusters on hydroxylated indium tin oxide: A view from first-principles calculations

2021 ◽  
Author(s):  
Simran Kumari ◽  
Philippe Sautet
Keyword(s):  
Heterogeneous Catalysis ◽  
Metal Atom ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
First Principles ◽  
Catalytic Performance ◽  
Small Cluster ◽  
Single Atom ◽  
First Principles Calculations ◽  
Highly Dispersed

Supported single-atom and small cluster catalysts have become highly popular in heterogeneous catalysis. These catalysts can maximize the metal atom utilization while still showcasing superior catalytic performance. One of the...

scholarly journals Ultra-small and highly-dispersed MoP particles for remarkable enhanced catalytic performance in higher alcohols synthesis

2020 ◽  
Vol 137 ◽  
pp. 105945 ◽  
Author(s):  
Bin Kang ◽  
Shuxia Qi ◽  
Xiaoman Wang ◽  
Fenghua Bai ◽  
Na Wang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Higher Alcohols ◽  
Higher Alcohols Synthesis ◽  
Highly Dispersed

Template-Mediated Ni(II) Dispersion in Mesoporous SiO2 for Preparation of Highly Dispersed Ni Catalysts: Influence of Template Type

2017 ◽  
Vol 9 (22) ◽  
pp. 19335-19344 ◽  
Author(s):  
Xin Ning ◽  
Yiyuan Lu ◽  
Heyun Fu ◽  
Haiqin Wan ◽  
Zhaoyi Xu ◽  
...  
Keyword(s):  
Ni Catalysts ◽  
Highly Dispersed ◽  
Mesoporous Sio2

Synthesis, Characterization, and Catalytic Performance of Highly Dispersed Co-SBA-15

2009 ◽  
Vol 113 (33) ◽  
pp. 14863-14871 ◽  
Author(s):  
Chuan Wang ◽  
Sangyun Lim ◽  
Guoan Du ◽  
Codruta Zoican Loebicki ◽  
Nan Li ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Highly Dispersed

scholarly journals Pt-Promoted Tungsten Carbide Nanostructures on Mesoporous Pinewood-Derived Activated Carbon for Catalytic Oxidation of Formaldehyde at Low Temperatures

2020 ◽  
Vol 1 (2) ◽  
pp. 86-105
Author(s):  
Qiangu Yan ◽  
Zhiyong Cai
Keyword(s):  
Electron Microscopy ◽  
Activated Carbon ◽  
Relative Humidity ◽  
Tungsten Carbide ◽  
Catalytic Oxidation ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Inert Atmosphere ◽  
Bet Surface Area ◽  
Formaldehyde Concentration

Tungsten carbide (WC) nanostructures were prepared by carbothermal reduction (CR) of tungsten-impregnated pinewood-derived activated carbon (AC) at 1000 °C under an inert atmosphere. Brunauer-Emmet-Teller (BET) surface area, pore structures of the AC, and catalyst samples were evaluated by N2 adsorption-desorption experiments. The structures of the catalysts were characterized using X-ray powder diffraction (XRD). The morphologies and particle structures of the synthesized WC nanoparticles were investigated by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). The WC/AC material was used as support of the platinum catalysts for catalytic oxidation of formaldehyde (HCHO) from interior sources. Pt-WC/AC catalysts with different platinum loadings were assessed for the catalytic oxidation of HCHO at low temperature. The catalytic performance was found to be significantly influenced by reaction temperature, initial formaldehyde concentration, relative humidity, and space velocity. The testing results demonstrated that HCHO can be totally oxidized by the 1 wt% Pt-WC/AC catalyst in the gas hourly space velocity (GHSV) = 50,000 h−1 at 30 °C with a relative humidity (RH) of 40%.

Low-temperature catalytic oxidation of aniline to azoxybenzene over an Ag/Fe2O3 nanoparticle catalyst using H2O2 as an oxidant

2019 ◽  
Vol 43 (23) ◽  
pp. 8911-8918 ◽  
Author(s):  
Bappi Paul ◽  
Sachin K. Sharma ◽  
Shubhadeep Adak ◽  
Rubina Khatun ◽  
Gurmeet Singh ◽  
...  
Keyword(s):  
Low Temperature ◽  
Catalytic Oxidation ◽  
One Pot ◽  
Efficient Catalyst ◽  
Highly Dispersed ◽  
Fe2o3 Nanoparticle ◽  
Nanoparticle Catalyst

Highly dispersed Ag-supported α-Fe2O3 is found to be a recyclable and efficient catalyst for one-pot conversion of aniline to azoxybenzene.

scholarly journals Highly dispersed Ni nanoparticles on 3D-mesoporous KIT-6 for CO methanation: Effect of promoter species on catalytic performance

2017 ◽  
Vol 38 (7) ◽  
pp. 1127-1137 ◽  
Author(s):  
Hong-Xia Cao ◽  
Jun Zhang ◽  
Cheng-Long Guo ◽  
Jingguang G. Chen ◽  
Xiang-Kun Ren
Keyword(s):  
Catalytic Performance ◽  
Ni Nanoparticles ◽  
Co Methanation ◽  
Highly Dispersed
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