The Effect of the Particle Size on the Kinetics of CO Electrooxidation on High Surface Area Pt Catalysts

2005 ◽  
Vol 127 (18) ◽  
pp. 6819-6829 ◽  
Author(s):  
Matthias Arenz ◽  
Karl J. J. Mayrhofer ◽  
Vojislav Stamenkovic ◽  
Berislav B. Blizanac ◽  
Tada Tomoyuki ◽  
...  
Keyword(s):  
Particle Size ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Pt Catalysts ◽  
Co Electrooxidation ◽  
Kinetics Of

Synthesis and characterization of mesalamine silica nanoparticles

2021 ◽  
Vol 16 ◽  
Author(s):  
Balaji Maddiboyina ◽  
Ramya Krishna Nakkala ◽  
Prasanna Kumar Desu ◽  
Vikas Jhawat
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Silica Nanoparticle ◽  
Water Soluble ◽  
Infrared Spectrometry ◽  
Burst Release ◽  
Wide Range

Background: Nanoparticles made of silica are new materials that can be used in a wide range of drug delivery methods because they are biocompatible and biodegradable. Mesalamine, a classic water-soluble medication, remains loaded into the synthesized silica nanoparticle and is considered for sustained release proficiency. Precipitation approach using high surface area and pore volume tetraethyl orthosilicate yielded mesalamine-loaded silica nanoparticles. Methods: The drug-loaded nanoparticle was created and produced using two different techniques. Fourier transform infrared spectrometry, differential scanning calorimetry, X-ray powder diffraction, Brauer Emmett teller, scanning electron microscopy, particle size measurements, and dissolution investigations have all been used to analyse the substance in some way or another. Results: Because of the high surface area, well-known results like the complete silica nanoparticle created using method-2 remained mesoporous. The onset peak of the method-2 formulation's DSC was 182.27°c, and the offset peak was 192.14°c, consistent with the DSC results. The particle size range varies from 205-225nm. The results demonstrate that the uptake of the mesalamine by burst release it for 30 minutes initial, followed by sustained maintenance of dose even after 240 minutes. The results indicate that the loading process has an effect on the extent of loading. When silica nanoparticles were impregnated with mesalamine, the amount of the drug contained was significantly higher than when they were wetted. Conclusion: In addition, the XRD results show that both the pure mesalamine and the formulation did not show any polymorphic deviation.

scholarly journals Ruthenium particle size and cesium promotion effects in Fischer–Tropsch synthesis over high-surface-area graphite supported catalysts

2017 ◽  
Vol 7 (5) ◽  
pp. 1235-1244 ◽  
Author(s):  
José L. Eslava ◽  
Xiaohui Sun ◽  
Jorge Gascon ◽  
Freek Kapteijn ◽  
Inmaculada Rodríguez-Ramos
Keyword(s):  
Particle Size ◽  
Surface Area ◽  
Supported Catalysts ◽  
High Surface ◽  
High Surface Area ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

The effect of ruthenium particle size on Fischer–Tropsch synthesis has been studied at 513 K, H2/CO = 2 and 15 bar.

scholarly journals Synthesis of Nanostructured TiO2 Microparticles with High Surface Area

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1512
Author(s):  
Lev Matoh ◽  
Boštjan Žener ◽  
Tina Skalar ◽  
Urška Lavrenčič Štangar
Keyword(s):  
Particle Size ◽  
Photocatalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Tio2 Particle ◽  
Nanostructured Tio2 ◽  
Degradation Rates

Hydrothermal reactions represent a simple and efficient method for the preparation of nanostructured TiO2 particles that could be of interest as photocatalysts or catalytic supports. Although the particle size is in the range of 2–5 µm, the nanostructures composing the particles ensure a large specific surface area with values above 100 m2/g. The effects of the different synthesis parameters on the morphology, photocatalytic activity, and stability of the prepared material were studied. The surface morphology of the prepared TiO2 powders was studied by scanning electron microscopy (SEM). To further characterize the samples, the specific surface area for different morphologies was measured and the photocatalytic activity of the prepared powders was tested by degrading model pollutants under UV irradiation. The results show that the initial morphology had little effect on the photocatalytic properties. On the other hand, the final calcination temperature significantly increased the degradation rates, making it comparable to that of P25 TiO2 (particle size 20–30 nm).

Kinetics of hydrogen chemisorption on high surface area Pd/Ce0.8Zr0.2O2

2005 ◽  
Vol 404-406 ◽  
pp. 317-322 ◽  
Author(s):  
F.C. Gennari ◽  
C. Neyertz ◽  
G. Meyer ◽  
P. Fornasiero ◽  
M. Graziani
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Chemisorption ◽  
Kinetics Of
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