Direct conversion of syngas to DME over CuO-ZnO-Al2O3/HZSM-5 nanocatalyst synthesized via ultrasound-assisted co-precipitation method: New insights into the role of gas injection

2014 ◽  
Vol 38 (15) ◽  
pp. 2030-2043 ◽  
Author(s):  
Somaiyeh Allahyari ◽  
Mohammad Haghighi ◽  
Amanollah Ebadi ◽  
Habib Qavam Saeedi
Keyword(s):  
Gas Injection ◽  
Direct Conversion ◽  
Precipitation Method ◽  
Ultrasound Assisted ◽  
Co Precipitation

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

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.

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

Role of Sm3+ Addition on Humidity Sensing of Nanocrystallite Mg-Cd Ferrites

2013 ◽  
Vol 645 ◽  
pp. 160-163 ◽  
Author(s):  
Gadkari B. Ashok ◽  
Shinde J. Tukaram ◽  
Vasambekar N. Pramod
Keyword(s):  
Recovery Time ◽  
Secondary Phase ◽  
Precipitation Method ◽  
Response And Recovery ◽  
Low Humidity ◽  
Ft Ir ◽  
Co Precipitation ◽  
Humidity Range

Nanocrystallite powders of 5 wt% Sm3+ added Mg-Cd ferrite samples were prepared by oxalate co-precipitation method. XRD, SEM and FT-IR techniques were used for characterization of the samples. The XRD reveals cubic spinel nature with secondary phase (SmFeO3). The crystallite size lies in the range of 28.69 to 32.66 nm. All the Sm3+ ions added samples are humidity sensitive at low humidity range 40 to70 %RH. The electrical resistivity of Sm3+ ions added samples decreased by four orders of magnitude, when %RH increased from 40%RH to 90 %RH. The response and recovery time of all the samples are 160-290 sec. The shorter response time was observed for Sm3+ added Cd ferrite sensor.

scholarly journals The role of Cu 2+ concentration in luminescence quenching of Eu3+/Cu2+ co-doped ZrO2 nanoparticles

2019 ◽  
Vol 35 (1) ◽  
Author(s):  
Vuong Pham Hung
Keyword(s):  
Luminescence Quenching ◽  
Precipitation Method ◽  
Zro2 Nanoparticles ◽  
Tetragonal Zro2 ◽  
Spectral Overlap ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Co Doped

This paper the role of Cu2+ concentrations in luminescence quenching of Eu3+/Cu2+ doped ZrO2 nanoparticles synthesized by co-precipitation method. The synthesized Eu3+/Cu2+ doped ZrO2 nanoparticles was observed to have a sphere morphology with a diameter of ~ 25 nm. The XRD patterns of the nanoparticles revealed the peaks that were to be crystalline tetragonal ZrO2. The addition of Cu2+ to the Eu3+ doped ZrO2 nanoparticles resulted in a significant suppress luminescence in Eu3+/Cu2+ doped ZrO2 nanoparticles, which was attributed to the spectral overlap occurs between Cu2+ absorption and Eu3+ emission (5D0→ 7F2 transition).

Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO–ZnO–Al2O3/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions

2014 ◽  
Vol 4 (6) ◽  
pp. 1779-1792 ◽  
Author(s):  
Reza Khoshbin ◽  
Mohammad Haghighi
Keyword(s):  
Dimethyl Ether ◽  
Catalytic Properties ◽  
Active Phase ◽  
Direct Conversion ◽  
Phase Ratio ◽  
Process Conditions ◽  
Ultrasound Assisted ◽  
Co Precipitation ◽  
Green Fuel

Hybrid co-precipitation–ultrasound synthesis of CuO–ZnO–Al2O3/HZSM-5 used in direct conversion of syngas to dimethyl ether as a green fuel.

On the Role of NaCl Addition to Phase Transformation of TiO2 from TiCl3

2015 ◽  
Vol 1112 ◽  
pp. 313-316 ◽  
Author(s):  
Irana Eka Putri ◽  
Herny Ariesta Budiarti ◽  
Dyah Sawitri ◽  
Doty D. Risanti
Keyword(s):  
Phase Transformation ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Rutile Phase ◽  
The Other ◽  
Precipitation Method ◽  
Control Solution ◽  
Key Points ◽  
Co Precipitation

Phase transformation of TiO2 (titanium dioxide) nanoparticles has been analyzed by observing the effect of NaCl addition to the anatase-to-rutile phase transformation. NaCl is one of key points in the transformation of rutile. Co-precipitation method was employed in which TiCl3 as precursor was reacted with HCl 2M and subsequent NH4OH. Three methods were studied, namely solution without NaCl addition (TiCl3 + HCl + NH4OH) as control solution subjected to route A (TiCl3 + HCl – NaCl– NH4OH – heated at 600°C for 5 hours) and route B (TiCl3 + NaCl – heated 200°C for 5 hours – NH4OH – heated 200°C for 6 hours). Route B was subjected to heating at 200°C. The results show that without NaCl it enhanced the crystal growth of the rutile embryos allowing the ease of rutile formation at 600°C, while route A promoted the transformation of brookite and hindered anatase-to-rutile transformation as indicated by the presence of anatase at 1000°C. On the other hand route B is potential for being further explored.

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