Synthesis and characterization of new hydrodesulphurization Co–Mo catalysts supported on calcined and pyrolyzed bone

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40647-40656
Author(s):  
M. Emami Yazdani ◽  
B. H. Monjezi ◽  
M. Mokfi ◽  
H. Bozorgzadeh ◽  
A. Gil ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Impregnation Method ◽  
Molybdenum Catalysts ◽  
Calcined Bone

A series of cobalt–molybdenum catalysts supported on calcined bone (hydroxyapatite, HAP) and pyrolyzed bone (hydroxyapatite–carbon, HAP–C) have been prepared by an impregnation method.

Synthesis and Characterization of Graphene/Zinc Oxide Nanocomposites

2017 ◽  
Author(s):  
Nurettin Sezer ◽  
Adnan Ali ◽  
Muataz A. Atieh ◽  
Muammer Koc
Keyword(s):  
Zinc Oxide ◽  
Average Particle Size ◽  
Zinc Nitrate ◽  
Synthesis And Characterization ◽  
Average Particle ◽  
Nitrate Hexahydrate ◽  
Gravimetric Analysis ◽  
Impregnation Method ◽  
Materials Used

This study investigates the synthesis and characterization of graphene/zinc oxide nanocomposites. Wet impregnation method was employed for the synthesis. Firstly, graphene nanoplatelets and zinc nitrate hexahydrate were concurrently dispersed in ethanol and subjected to sonication for 1 h. Then, the dispersion was put in a furnace at 70 °C overnight. The paste was then collected and heated further up to 400 °C in air for a duration of 4 h. The process was proceeded to yield insoluble nanocomposites. The synthesis was followed by characterization of the nanocomposite samples by Field Emission Scanning Electron Microscopy (FESEM), X-Ray Diffraction (XRD) and Thermal Gravimetric Analysis (TGA). The XRD pattern revealed the presence of ZnO crystals and graphene. The FESEM images showed that ZnO crystals with average particle size of 30 nm are uniformly distributed on graphene surfaces. According to the TGA result, the content of nanocomposites is in good agreement with the materials used during synthesis.

Synthesis and characterization of BN/Bi2WO6 composite photocatalysts with enhanced visible-light photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 88832-88840 ◽  
Author(s):  
Weibin Li ◽  
Qi Wang ◽  
Liying Huang ◽  
Yeping Li ◽  
Yuanguo Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Synthesis And Characterization ◽  
Impregnation Method ◽  
Visible Light Photocatalytic Activity ◽  
Composite Photocatalysts ◽  
Visible Light Photocatalytic

Bi2WO6 modified with few-layer BN was synthesized by an impregnation method. The as-prepared BN/Bi2WO6 photocatalysts exhibited a higher photocatalytic activity for the degradation of Rhodamine B (RhB) than the pure Bi2WO6.

scholarly journals Synthesis And Characterization Of Nickel-Molybdenum Catalysts Supported On Copper Orthophosphates

2020 ◽  
Vol 948 ◽  
pp. 012023
Author(s):  
Ouchabi Mbarka ◽  
Baalala Mohammed ◽  
Elaissi Abdelkrim ◽  
Bensitel Mohammed
Keyword(s):  
Synthesis And Characterization ◽  
Molybdenum Catalysts

scholarly journals Bimetallic CoMo Nanoparticles Supported over Carbon-Zeolite Composites as Dibenzothiophene Hydrodesulfurization Catalyst

2021 ◽  
Vol 16 (4) ◽  
pp. 831-838
Author(s):  
Zahra Mohammadian ◽  
Mohammad Hasan Peyrovi ◽  
Nastaran Parsafard
Keyword(s):  
Activated Carbon ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Temperature Range ◽  
Molybdenum Catalysts ◽  
Adsorption Desorption ◽  
Open Access Article

Cobalt molybdenum catalysts supported on novel activated carbon-HZSM-5 composites with different mass ratios were prepared by wet-impregnation method and pre-sulfided by CS2. Characterization of these catalysts was done using X-ray powder diffraction, Fourier transform infrared spectroscopy, N2 adsorption-desorption, and scanning electron microscope analytics. Their activity for the hydrodesulfurization reaction of dibenzothiophene was investigated at atmospheric pressure in the temperature range of 250–400 °C using the fixed-bed reactor with 0.5 g of each powder and pre-sulfided with CS2. The highest conversion of dibenzothiophene at the temperature range of 300–400 °C was obtained for the CoMo/activated carbon-HZSM-5(1:1) catalyst. The best selectivity for cyclohexylbenzene, which is the dominant product according to gas chromatography results, was obtained at all temperatures using CoMo/activated carbon-HZSM-5(3:1) catalyst. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Synthesis and Characterization of Bimetallic Fe/Co Nanocatalyst on CNTs for Fischer-Tropsch Reaction

2012 ◽  
Vol 16 ◽  
pp. 9-14 ◽  
Author(s):  
Sardar Ali ◽  
Noor Asmawati Mohd Zabidi ◽  
Duvvuri Subbarao
Keyword(s):  
Particle Size ◽  
Physicochemical Properties ◽  
Average Particle Size ◽  
Xrd Analysis ◽  
Synthesis And Characterization ◽  
Average Particle ◽  
Impregnation Method ◽  
Fischer Tropsch ◽  
Temperature Programmed

Cobalt and iron are common catalysts used in the Fischer-Tropsch (FT) reaction. This paper presents the synthesis and characterization of monometallic and bimetallic cobalt and iron nanoparticles supported on carbon nanotubes (CNTs). The CNTs-supported nanocatalysts were synthesized by a wet impregnation method at various ratios of Fe:Co. The physicochemical properties of the samples were analyzed by H2-temperature programmed reduction (TPR), CO and H2-chemisorption analyses, transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. The effects of incorporation of Fe into Co on the physicochemical properties of Co/CNTs in terms of degree of reduction, CO and H2 chemisorptions and morphologies were investigated. TEM showed that metal nanoparticles were well dispersed on the external surface and inside the CNTs. For monometallic Co/CNTs and Fe/CNTs, the average metal particle size was 5±1 nm and 6±1 nm, respectively. For the bimetallic 70Co30Fe/CNTs nanocatalysts, the average particle size was found to be 4±1 nm. Metal particles attached to the outer walls were bigger than the ones inside the CNTs. H2-TPR analysis of Co/CNTs indicated two temperature regions at 330°C (low temperature) and 491°C (high temperature). The incorporation of iron into cobalt nanocatalysts of up to 30 % of the total metal loading enhanced the catalyst’s H2 and CO chemisorptions capacities and reducibility.

scholarly journals Synthesis and Characterization of Mesoporous Silica SBA-15 and ZnO/SBA-15 Photocatalytic Materials from the Ash of Brickyards

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
Quach Nguyen Khanh Nguyen ◽  
Nguyen Thi Yen ◽  
Nguyen Duc Hau ◽  
Hoai Lam Tran
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Pore Size ◽  
Surface Area ◽  
Capillary Tube ◽  
Hexagonal Structure ◽  
Synthesis And Characterization ◽  
Impregnation Method ◽  
Tube Size

SBA-15 has been successfully synthesized from ash of brickyard with the surface area of 700.100 m2/g, pore volume of 0.813 cm3·g−1, and pore size of 7.5 nm. SBA-15 material has been modified by a simple impregnation method, and the ZnO/SBA-15 obtained material retains the hexagonal structure of SBA-15, but the hexagonal capillary tube size is reduced, in which the surface area, volume of pores, and pore size is 212.851 m2·g−1, 0.244 cm3·g−1, and 3.7 nm, respectively. The ZnO/SBA-15 materials were investigated by the photodegradation of methylene blue under ultraviolet light and exhibited significant photocatalytic activity with the reached MB removal efficiency about 96.69%.

scholarly journals Synthesis And Characterization Of CoMo/Mordenite Catalyst For Hydrotreatment Of Lignin Compound Models

2019 ◽  
Vol 17 (1) ◽  
pp. 1061-1070
Author(s):  
Khoirina Dwi Nugrahaningtyas ◽  
Nining Rahmawati ◽  
Fitria Rahmawati ◽  
Yuniawan Hidayat
Keyword(s):  
Electron Microscopy ◽  
Metal Content ◽  
Synthesis And Characterization ◽  
Impregnation Method ◽  
Total Acidity ◽  
X Ray Diffraction ◽  
Methyl Group ◽  
X Ray ◽  
Scanning Electron

AbstractThe synthesis of CoMo/Mordenite (CoMo/MOR) catalysts was conducted using a co-impregnation method at a various Co/Mo ratios. The produced catalysts were then characterized by X-ray diffraction, total acidity analysis, and scanning electron microscopy. The activity of the catalyst in a hydrotreatment reaction was evaluated by applying the catalyst as a reduced-catalyst to the hydrocracking (HC) reaction of anisole molecules. Analysis of the diffraction data using the Le Bail refinement technique showed that the metal phase was successfully impregnated into the MOR. In addition, increasing the metal content resulted in an increase in the acidity of the catalysts and changed the morphology of the catalysts from homogeneous to heterogeneous with larger particle size. According to the data of GCMS, it is known that the catalysts successfully removed methyl group of anisole molecules. Hydrotreatment reaction with the prepared-catalyst produced 4.77% of phenols. It is 122 % higher than the reaction with MOR catalyst.

Synthesis and Characterization of Y2O3/SiO2 Composites

2004 ◽  
Vol 59 (4-5) ◽  
pp. 281-287
Author(s):  
C. Cannas ◽  
M. Casu ◽  
M. Mainas ◽  
A. Musinu ◽  
G. Piccaluga
Keyword(s):  
Molecular Level ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Impregnation Method ◽  
Deposition Method ◽  
Yttrium Hydroxide ◽  
Nanocrystalline Particles ◽  
Silica Addition ◽  
Average Size

Impregnation and deposition-precipitation syntheses have been used to obtain Y2O3/SiO2 samples. In the deposition method, the urea causes the precipitation of yttrium hydroxide, which leads to the formation of yttria nanocrystalline particles in the final composites. Delaying the silica addition up to the visible muddying of the solution, a relevant formation of yttria nanocrystalline particles with average size of about 12 nm is produced. The composites obtained through the impregnation method are amorphous and contain different amounts of yttrium depending on the kind of solvent, the highest concentration being reached using ethanol. In all the samples important interactions at the molecular level among yttrium and silica are revealed, but less important in composites obtained with the deposition precipitation method.

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