A highly-efficient La–MnOx catalyst for propane combustion: the promotional role of La and the effect of the preparation method

2016 ◽  
Vol 6 (23) ◽  
pp. 8222-8233 ◽  
Author(s):  
Yujie Xie ◽  
Yun Guo ◽  
Yanglong Guo ◽  
Li Wang ◽  
Wangcheng Zhan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Preparation Method ◽  
Deep Oxidation ◽  
Precipitation Method ◽  
Propane Combustion ◽  
Highly Efficient ◽  
Excellent Activity ◽  
Co Precipitation

The La0.4–MnOx catalyst prepared by using the co-precipitation method exhibited excellent activity and thermal stability for propane deep oxidation.

scholarly journals Room-Temperature Nitrophenol Reduction over Ag–CeO2 Catalysts: The Role of Catalyst Preparation Method

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 580 ◽  
Author(s):  
Mariia Chernykh ◽  
Natalia Mikheeva ◽  
Vladimir Zaikovskii ◽  
Mikhail Salaev ◽  
Leonarda F. Liotta ◽  
...  
Keyword(s):  
Room Temperature ◽  
Preparation Method ◽  
Order Rate Constant ◽  
Catalyst Preparation ◽  
First Order ◽  
Impregnation Technique ◽  
Nitrophenol Reduction ◽  
Co Precipitation ◽  
N2 Sorption

Ag–CeO2 catalysts (20 mol % Ag) were synthesized using different techniques (co-precipitation, impregnation, and impregnation of pre-reduced ceria), characterized by XRD, N2 sorption, TEM, H2-TPR methods, and probed in room-temperature p-nitrophenol reduction into p-aminophenol in aqueous solution at atmospheric pressure. The catalyst preparation method was found to determine the textural characteristics, the oxidation state and distribution of silver and, hence, the catalytic activity in the p-nitrophenol reduction. The impregnation technique was the most favorable for the formation over the ceria surface of highly dispersed silver species that are active in the p-nitrophenol reduction (the first-order rate constant k = 0.656 min−1).

Role of Ni2+ Ions in Magnetite Nano-particles Synthesized by Co-precipitation Method

2016 ◽  
Vol 30 (5) ◽  
pp. 1177-1186 ◽  
Author(s):  
Safia Anjum ◽  
Hafsa Saleem ◽  
Khalid Rasheed ◽  
Rehana Zia ◽  
Saira Riaz ◽  
...  
Keyword(s):  
Nano Particles ◽  
Precipitation Method ◽  
Co Precipitation

Investigation of the thermal stability of Mn ferrite particles synthesized by a modified co-precipitation method

2012 ◽  
Vol 56 (3) ◽  
pp. 568-572 ◽  
Author(s):  
ChunHui Dong ◽  
GaoXue Wang ◽  
Lei Shi ◽  
DangWei Guo ◽  
ChangJun Jiang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Precipitation Method ◽  
Co Precipitation ◽  
Thermal Stability Of

Preparation of Tetracalcium Phosphate and the Effect on the Properties of Calcium Phosphate Cement

2009 ◽  
Vol 610-613 ◽  
pp. 1356-1359 ◽  
Author(s):  
Dan Kai ◽  
Hong Song Fan ◽  
Dong Xiao Li ◽  
Xiang Dong Zhu ◽  
Xing Dong Zhang
Keyword(s):  
Particle Size ◽  
Calcium Phosphate ◽  
Calcium Phosphate Cement ◽  
Preparation Method ◽  
Precipitation Method ◽  
Improve Performance ◽  
Solid Reaction ◽  
Tetracalcium Phosphate ◽  
Fast Cooling ◽  
Co Precipitation

In the present study, three types of tetracalcium phosphate (TTCP) were prepared by solid-solid reaction or co-precipitation method and by different cooling modes. The effect of TTCP on the performance of calcium phosphate cement (CPC) was investigated. The result showed that the characteristic of TTCP varied with preparation method and played an important role in CPC performance. A solid-solid reacted TTCP yielded smaller particle size and resulted in bad workability and mechanical strength of CPC. The fast cooling of sintering TTCP by liquid nitrogen could avoid the decomposition of TTCP and make pure TTCP. TTCP prepared by wet-precipitation could improve performance of CPC and was promising to optimization of CPC.

scholarly journals The Influence of the Preparation Method on the Physico-Chemical Properties and Catalytic Activities of Ce-Modified LDH Structures Used as Catalysts in Condensation Reactions

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6191
Author(s):  
Alexandra-Elisabeta Stamate ◽  
Rodica Zăvoianu ◽  
Octavian Dumitru Pavel ◽  
Ruxandra Birjega ◽  
Andreea Matei ◽  
...  
Keyword(s):  
Preparation Method ◽  
Mixed Oxides ◽  
Condensation Reaction ◽  
Chemical Properties ◽  
Precipitation Method ◽  
Synthesis Methods ◽  
Molar Ratios ◽  
Base Catalysts ◽  
Physico Chemical ◽  
Co Precipitation

Mechanical activation and mechanochemical reactions are the subjects of mechanochemistry, a special branch of chemistry studied intensively since the 19th century. Herein, we comparably describe two synthesis methods used to obtain the following layered double hydroxide doped with cerium, Mg3Al0.75Ce0.25(OH)8(CO3)0.5·2H2O: the mechanochemical route and the co-precipitation method, respectively. The influence of the preparation method on the physico-chemical properties as determined by multiple techniques such as XRD, SEM, EDS, XPS, DRIFT, RAMAN, DR-UV-VIS, basicity, acidity, real/bulk densities, and BET measurements was also analyzed. The obtained samples, abbreviated HTCe-PP (prepared by co-precipitation) and HTCe-MC (prepared by mechanochemical method), and their corresponding mixed oxides, Ce-PP (resulting from HTCe-PP) and Ce-MC (resulting from HTCe-MC), were used as base catalysts in the self-condensation reaction of cyclohexanone and two Claisen–Schmidt condensations, which involve the reaction between an aromatic aldehyde and a ketone, at different molar ratios to synthesize compounds with significant biologic activity from the flavonoid family, namely chalcone (1,3-diphenyl-2-propen-1-one) and flavone (2-phenyl-4H-1benzoxiran-4-one). The mechanochemical route was shown to have indisputable advantages over the co-precipitation method for both the catalytic activity of the solids and the costs.

Potential of Functionalized Magnetite (Fe3O4) in Decontamination of Pathogenic Bacteria from Milk

2019 ◽  
Vol 41 (6) ◽  
pp. 1014-1014
Author(s):  
Aneela Hameed Aneela Hameed ◽  
Hafiza Mehvish Mushtaq Hafiza Mehvish Mushtaq ◽  
Saeed Akhtar Saeed Akhtar ◽  
Tariq Ismail Tariq Ismail ◽  
Majid Hussain Majid Hussain ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Magnetic Nanoparticles ◽  
Pathogenic Bacteria ◽  
High Surface ◽  
Nutritional Composition ◽  
Ethylene Diamine ◽  
Precipitation Method ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

Magnetite (Fe3O4) is getting popular due to its super-paramagnetic properties, high biocompatibility and lack of toxicity to humans. Magnetite (Fe3O4) nanoparticles have high surface energy thus these nanoparticles aggregate quickly. This aggregation strongly affects the efficiency of these nanoparticles. So these magnetite nanoparticles are coated with organic or inorganic substance to prevent aggregation. These coatings not only stabilize magnetic nanoparticles but can also be used for further functionalization. The aim of this study was to evaluate the efficiency of functionalized magnetite to remove pathogenic bacteria (E.coli and B.cereus) from milk considering binding capability of magnetite with bacterial cell wall. Magnetite (Fe3O4) was prepared by co-precipitation method and subsequently functionalized with oleic acid (OA) and ethylene diamine (EDA). In present study role of magnetite (Fe3O4) and functionalized magnetite (EDA-Fe3O4, OA-Fe3O4) in removal of pathogenic bacteria (E.coli and B.cereus) from milk was investigated. The morphology of functionalized magnetite was determined by Scanning Electron microscopy (SEM). Their removal efficiency was studied based on time (10, 20 and 30 minutes). Concentration of uncoated magnetite (Fe3O4) and coated magnetite (EDA-Fe3O4, OA-Fe3O4) was fixed at 4mg/50mL. Magnetite was successfully synthesized in range of and#177;3nm. Highest capturing efficiency (74.45%) of oleic acid magnetite (OA-Fe3O4) was observed for Bacillus cereus at 30 minutes. However for Escherichia coli, both ethylene-diamine magnetite (EDA-Fe3O4) and oleic acid magnetite (OA-Fe3O4) showed maximum capturing efficiency (61.65% and 63.91% respectively). It was concluded from the study that magnetite coated with oleic acid and ethylenediamine removed pathogenic bacteria from milk efficiently. However, more research is required to study the effect of these magnetic nanoparticles on nutritional composition of milk.

The Role of Fe2+ Ions on the Photocatalytic Reaction of Ag3PO4 for Rhodamine B Degradation

2015 ◽  
Vol 1112 ◽  
pp. 158-162
Author(s):  
Anung Riapanitra ◽  
Intan Futihah ◽  
Uyi Sulaeman ◽  
Shu Yin ◽  
Tsugio Sato
Keyword(s):  
Rhodamine B ◽  
Photocatalytic Oxidation ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Photocatalytic Reaction ◽  
Photocatalytic Activities ◽  
Photocatalysis Reaction ◽  
Co Precipitation

The Ag3PO4 crystal with 200-600 nm in diameter was successfully synthesized using co-precipitation method with AgNO3 and Na2HPO4.12H2O as starting materials. The product was characterized using XRD, DRS, FTIR and SEM. The photocatalytic activities were evaluated under blue light irradiation assisted by Fe2+. The 1 mL of Fe2+ aqueous solutions consisted of 1.00, 0.10, 0.01, 0.001 and 0.0001 mM Fe2+ was added into a 100 mL solution of Rhodamine B, and the photocatalytic oxidation of Rhodamine B was carried out under visible light irradiation. The highest photocatalytic activity was observed when 1 ml of 0.001 mM of Fe2+ aqueous solution was added in the Rhodamine B solution. The result inferred the possibility of in-situ peroxide generation during the photocatalysis reaction.

Investigation of the Role of Ce3+ Substituted Ions on Dielectric Properties of Co-Cr Ferrites Prepared by Co-precipitation Method

2016 ◽  
Vol 45 (11) ◽  
pp. 5830-5838 ◽  
Author(s):  
Ghulam Mustafa ◽  
M. U. Islam ◽  
Wenli Zhang ◽  
M. I. Arshad ◽  
Yasir Jamil ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Precipitation Method ◽  
Co Precipitation
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