scholarly journals High-yield synthesis of Ce modified Fe–Mn composite oxides benefitting from catalytic destruction of chlorobenzene

RSC Advances ◽  
2020 ◽  
Vol 10 (17) ◽  
pp. 10030-10037 ◽  
Author(s):  
Anqi Li ◽  
Hongming Long ◽  
Hongliang Zhang ◽  
Haijin Li
Keyword(s):  
Oxalic Acid ◽  
Precipitation Method ◽  
High Yield ◽  
Composite Oxides ◽  
Catalytic Destruction ◽  
Co Precipitation

Ce–Fe–Mn catalysts were prepared by an oxalic acid assisted co-precipitation method.

Multidoped Ln3+ gadolinium dioxycarbonates as tunable white light emitting phosphors

2017 ◽  
Vol 46 (9) ◽  
pp. 2785-2792 ◽  
Author(s):  
I. Nelli ◽  
A. M. Kaczmarek ◽  
F. Locardi ◽  
V. Caratto ◽  
G. A. Costa ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
White Light ◽  
Precipitation Method ◽  
Light Emitting ◽  
Co Precipitation ◽  
Co Doped

Gadolinium dioxycarbonates co-doped with different visible emitting lanthanides were synthesized via a co-precipitation method using oxalic acid as a precipitating agent.

High Production of Carbon Nanotube Bundles with Fe2O3/Al2O3 Catalyst

2014 ◽  
Vol 695 ◽  
pp. 122-126 ◽  
Author(s):  
Shazia Shukrullah ◽  
Norani Muti Mohamed ◽  
Maizatul Shima Shaharun
Keyword(s):  
Electron Microscopy ◽  
Surface Defects ◽  
Chemical Vapor ◽  
Precipitation Method ◽  
High Yield ◽  
Outer Diameter ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Black Spots ◽  
Co Precipitation

In this study, Fe2O3/Al2O3catalyst was prepared by using co-precipitation method. This catalyst weight was varied from 0.1 to 0.5 g and multiwalled carbon nanotubes (MWCNTs) bundles were synthesized with ethylene as a carbon precursor at reaction temperature of 800°C by using floating catalytic chemical vapor deposition reactor. The grown MWCNTs bundles were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The obtained data revealed that as prepared CNTs actually existed in bundles and these should be attributed to the Fe2O3/Al2O3catalyst, as transition metal Mo was not used in the catalyst. It was noted that an increase in weight of the catalyst significantly affects the quality, quantity, crystallinity, diameter and the growth of nanotubes bundles. Nanotubes yield increased with an increase in Fe2O3/Al2O3weight. The carbon yield obtained with different weights of Fe2O3/Al2O3was ranging from 68-93%. However, the surface defects in the grown tubes were also increased with an increase in the catalyst weight. High purity and high yield with the low surface defects was found for 0.3 g catalyst. It was found that less value of ID/IGratio (0.78) was obtained in case of 0.3 g catalyst which indicated the structural perfection and low defect levels. The average outer diameter of the grown CNTs bundles were ranged from 240 to 550 nm. The formation of CNTs bundles were found defective with few black spots and impure above and below the use of 0.3 g catalyst.

Influence of Organic Additives on Shape and Adsorbing Properties of Nano-Fe3O4 Particles

2012 ◽  
Vol 454 ◽  
pp. 41-45 ◽  
Author(s):  
Yi Min Zhu ◽  
Bin Bin Luo ◽  
Shu Chao Wan ◽  
Zhi Jun Ma ◽  
Yan Jun Li
Keyword(s):  
Oxalic Acid ◽  
Microwave Absorption ◽  
Magnetite Nanoparticles ◽  
Great Influence ◽  
Microwave Absorption Property ◽  
Precipitation Method ◽  
Complex Permeability ◽  
Absorption Property ◽  
Organic Additives ◽  
Co Precipitation

Nano-Fe3O4 powders were prepared by chemical co-precipitation method. The granularity, morphology and absorbing properties of the magnetite nanoparticles were characterized by XRD, SEM, TEM and complex permeability. The effects of organic additives to the granularity, morphology and microwave absorption property of nanosized magnetic Fe3O4 were studied. The results show that the organic additives have great influence on the morphology of nano-Fe3O4 particles. Spherical nano-Fe3O4 is prepared by oxalic acid. And the absorption property of nano-Fe3O4 is better.

Effect of dispersed ZnO in Cu–Zn composite oxides on catalytic activity of anisole acetylation

2020 ◽  
Vol 44 (25) ◽  
pp. 10492-10499
Author(s):  
Yanqiu Chen ◽  
Yue Yang ◽  
Zhou Zhou ◽  
Wei Luo ◽  
Junhua Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxide Catalysts ◽  
Precipitation Method ◽  
Composite Oxide ◽  
Composite Oxides ◽  
Co Precipitation

Cu–Zn composite oxide catalysts were prepared by a co-precipitation method and used in the anisole acetylation reaction.

scholarly journals Preparation of Mesoporous Structure Electrode Materials ZnMn2O4 by Co-precipitation Method

2020 ◽  
Vol 145 ◽  
pp. 02057
Author(s):  
Jiaxing Song ◽  
Tao Guo ◽  
Qiong Wang ◽  
Miao Yao ◽  
Yiming Mao
Keyword(s):  
Oxalic Acid ◽  
Electrode Material ◽  
Electrode Materials ◽  
Zinc Acetate Dihydrate ◽  
Mesoporous Structure ◽  
Xrd Analysis ◽  
Precipitation Method ◽  
Manganese Sulfate ◽  
Calcination Temperatures ◽  
Co Precipitation

In order to study the fast and efficient method of preparing electrode material ZnMn2O4, in this paper, oxalic acid was selected as the precipitator, oxalic acid dihydrate (C2H2O4•2H2O) as the chemical precipitator, manganese sulfate monohydrate (MnSO4•H2O) as the manganese source and zinc acetate dihydrate (C4H6O4Zn•2H2O) as the zinc source. The precursor was prepared by co-precipitation method. Then, ZnMn2O4 powders with mesoporous structure were obtained at different calcination temperatures. The phase of ZnMn2O4 powders at different calcination temperatures was characterized by XRD analysis. After considering the crystallinity and high temperature agglomeration, samples calcinated at 600oC were selected as the cathode material of the battery, and were characterized by SEM and TEM. The experimental results show that the electrode material ZnMn2O4 prepared by this method has high crystallinity, high preparation efficiency, energy saving, environmental protection and good dispersion.

Magnetic and dielectric properties of BiFeO3 nanoparticles

2015 ◽  
Vol 7 (2) ◽  
pp. 1393-1403
Author(s):  
Dr R.P VIJAYALAKSHMI ◽  
N. Manjula ◽  
S. Ramu ◽  
Amaranatha Reddy
Keyword(s):  
Diffuse Reflectance Spectrum ◽  
Precipitation Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Bifeo3 Nanoparticles ◽  
Transmission Electron ◽  
Multiferroic Bifeo3 ◽  
Pure Phase ◽  
Simple Chemical ◽  
Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM).   Linear M−H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

Sign in / Sign up

Export Citation Format

Share Document