Catalytic amination of diethylene glycol with tertiarybutylamine over Ni–Al2O3 catalysts with different Ni/Al ratios

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102373-102380 ◽  
Author(s):  
Dongdong Cheng ◽  
Zhenlu Wang ◽  
Yanyang Xia ◽  
Yumeng Wang ◽  
Wenxiang Zhang ◽  
...  
Keyword(s):  
Diethylene Glycol ◽  
Heterogeneous Catalysts ◽  
Precipitation Method ◽  
Catalytic Amination ◽  
Co Precipitation

The catalytic amination of diethylene glycol (DEG) with tertiarybutylamine (TBA) to tertiarybutylaminoethoxyethanol (TBEE) was investigated on Ni–Al2O3 heterogeneous catalysts that were prepared using the co-precipitation method.

scholarly journals Novel iron doped calcium oxalates as promising heterogeneous catalysts for one-pot multi-component synthesis of pyranopyrazoles

RSC Advances ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 423-432 ◽  
Author(s):  
Kranthi Kumar Gangu ◽  
Suresh Maddila ◽  
Surya Narayana Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Glutamic Acid ◽  
Heterogeneous Catalysts ◽  
Precipitation Method ◽  
One Pot ◽  
Surface Modifier ◽  
Calcium Oxalates ◽  
Iron Doped ◽  
Co Precipitation

The co-precipitation method using a surface modifier, glutamic acid was employed in the design of iron doped calcium oxalates (Fe-CaOx).

scholarly journals Efficient decolorization of Methylene Blue catalyzed by MgFe-layered double hydroxides in the presence of hydrogen peroxide

2020 ◽  
Vol 81 (4) ◽  
pp. 781-789
Author(s):  
Qian Wang ◽  
Xiaofei Wang ◽  
Siqian Liu ◽  
Rong Li
Keyword(s):  
Methylene Blue ◽  
Hydroxyl Radicals ◽  
Layered Double Hydroxides ◽  
Room Temperature ◽  
Heterogeneous Catalysts ◽  
Precipitation Method ◽  
Fenton Process ◽  
Initial Ph ◽  
Co Precipitation ◽  
Double Hydroxides

Abstract MgFe-layered double hydroxides (LDHs) were prepared by co-precipitation method with the ratios of [Mg2+]/[Fe3+] varied in the range of 2:1–6:1, and occupied as heterogeneous catalysts for the degradation of Methylene Blue (MB) in the Fenton process. MgFe-LDH prepared with the ratio of [Mg2+]/[Fe3+] at 3:1 was verified to be of high purity. The Fenton-like process catalyzed by MgFe-LDH performed excellently, and more than 97% degradation of MB was obtained with 0.5 mmol/L H2O2 and 0.50 g/L MgFe-LDH at initial pH 2 at room temperature. The occurrence of hydroxyl radicals (·OH) was detected and the mechanism was proposed. MgFe-LDH is of excellent catalytic activity and good reusability.

LOW TEMPERATURE CRYSTALLIZATION OF BARIUM FERRITE NANO-PARTICLES VIA CO-PRECIPITATION METHOD USING DIETHYLENE GLYCOL

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3144-3152 ◽  
Author(s):  
M. MONTAZERI-POUR ◽  
A. ATAIE
Keyword(s):  
Diethylene Glycol ◽  
Barium Ferrite ◽  
Water Solution ◽  
Volume Ratio ◽  
Nano Particles ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Water Mixture ◽  
Nano Crystalline ◽  
Co Precipitation

Nano-crystalline particles of barium ferrite have been prepared by co-precipitation route using aqueous and non-aqueous solutions of iron and barium chlorides with a Fe/Ba molar ratio of 11. Water and a mixture of diethylene glycol and water with volume ratio of 3:2 were used as solvents in the process. Co-precipitated powders were annealed at various temperatures for 1 h. Phase composition of the samples was evaluated by XRD while their morphology was studied by TEM and SEM techniques. The XRD results showed that the single phase barium ferrite obtained at 750°C when diethylene glycol/water mixture was used as a solvent. This temperature increased to 900°C when the starting materials dissolved in water. Nano-size particles of barium ferrite with mean particle size of almost 50 and 80 nm were observed in the SEM micrographs of the samples synthesized in diethylene glycol/water solution after annealing at 750°C and 800°C for 1 h, respectively. The corresponding mean crystallite size measured by TEM for sample annealed at 800°C was 40 nm.

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.

Exploring the characterization of Ni doped MgO nanoparticles using co-precipitation method

2020 ◽  
Vol 3 (1) ◽  
pp. 30-33
Author(s):  
Muthulakshmi M ◽  
Madhumitha G
Keyword(s):  
Magnesium Oxide ◽  
Analytical Techniques ◽  
Nickel Chloride ◽  
Precipitation Method ◽  
Crystalline Powder ◽  
High Melting Point ◽  
Design Synthesis ◽  
Mgo Nanoparticles ◽  
Co Precipitation

Nanotechnology is a field of applied science focused on design, synthesis and characterization of nanomaterials. The nickel and magnesium have improved their applications in transparent electrodes and nano electronics. In addition, magnesium oxide has moisture resistance and high melting point properties. In the present work has been carried out in the development of green crystalline powder of nickel doped magnesium oxide nanoparticles by Co-precipitation method, from the mixture of nickel chloride and magnesium chloride with KOH as solvent. From the XRD results, crystalline size of the particle can be observed. Spherical structure of Ni doped MgO nanoparticles were indicated by SEM results and powdered composition of samples were obtained from FTIR. EDAX represents the peak composition of the nanoparticle. The above analytical techniques have confirmed that the Ni doped MgO nanoparticles obtained from the mixture of NiCl2 and MgCl2.

Diseases Prevention by Water Defluoridation Using Hydrotalcites as Decontaminant Materials

2017 ◽  
Vol 68 (1) ◽  
pp. 168-171 ◽  
Author(s):  
Letitia Doina Duceac ◽  
Cristina Elena Dobre ◽  
Ioana Pavaleanu ◽  
Gabriela Calin ◽  
Simona Nichitus ◽  
...  
Keyword(s):  
Dental Fluorosis ◽  
Precipitation Method ◽  
Original Structure ◽  
Fluoride Removal ◽  
Major Goal ◽  
Bone Stiffness ◽  
Morphological Aspects ◽  
Adsorption Capacities ◽  
Interlayer Structure ◽  
Co Precipitation

Preventing diseases is deemed to be the major goal of our century especially when an excessive fluoride in drinking water can cause dental fluorosis, bone stiffness, rheumatism and skeletal fluorosis. Fluoride uptake from groundwater implies a worldwide multidisciplinary effort in order to develop renewable, cheap, human friendly materials. Among other materials, hydrotalcites could be good candidates for an efficient fluoride removal from water due to their adsorption, anion exchange and reconstruction properties. These nanostructured materials were synthesized using co-precipitation method in controlled conditions. Presence of anions in the interlayer structure and morphological aspects were performed by FTIR and SEM techniques. Thermal treatment of hydrotalcites showed good adsorption capacities for water defluoridation mostly due to their tendency to restore the original structure.

Synthesis of highly sinterable YAG nanopowders by a modified co-precipitation method

2007 ◽  
Vol 433 (1-2) ◽  
pp. 328-331 ◽  
Author(s):  
Zhi-Hui Chen ◽  
Yun Yang ◽  
Zhang-Gui Hu ◽  
Jiang-Tao Li ◽  
Shu-Li He
Keyword(s):  
Precipitation Method ◽  
Co Precipitation
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