CuCr2O4 derived by the sol–gel method as a highly active and selective catalyst for the conversion of glycerol to 2,6-dimethylpyrazine: a benign and eco-friendly process

2017 ◽  
Vol 7 (15) ◽  
pp. 3399-3407 ◽  
Author(s):  
Krishna Vankudoth ◽  
Naresh Gutta ◽  
Vijay Kumar Velisoju ◽  
Suresh Mutyala ◽  
Hari Padmasri Aytam ◽  
...  
Keyword(s):  
Surface Area ◽  
Metal Surface ◽  
Sol Gel ◽  
Selective Catalyst ◽  
Gel Method ◽  
Sol Gel Method ◽  
Basic Sites ◽  
Metal Surface Area ◽  
Highly Active

A direct correlation between Cu metal surface area and surface basic sites of CuCr2O4 and the 2,6-dimethylpyrazine rate is established.

Synthesis and structural characteristics of high surface area TiO2 aerogels by ultrasonic-assisted sol–gel method

2018 ◽  
Vol 29 (7) ◽  
pp. 075702 ◽  
Author(s):  
Feng Qingge ◽  
Cai Huidong ◽  
Lin Haiying ◽  
Qin Siying ◽  
Liu Zheng ◽  
...  
Keyword(s):  
Surface Area ◽  
Structural Characteristics ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ultrasonic Assisted

scholarly journals Synthesis of Spherical Silica by Sol-Gel Method and Its Application as Catalyst Support

2011 ◽  
Vol 10 (2) ◽  
pp. 25
Author(s):  
Anirut Leksomboon ◽  
Bunjerd Jongsomjit
Keyword(s):  
Particle Size ◽  
Ethylene Glycol ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sol Gel ◽  
Weight Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Spherical Silica

In this present study, the spherical silica support was synthesized from tetraethyloxysilane (TEOS), water, sodium hydroxide, ethylene glycol and n-dodecyltrimethyl ammonium bromide (C12TMABr). The particle size was controlled by variation of the ethylene glycol co-solvent weight ratio of a sol-gel method preparation in the range of 0.10 to 0.50. In addition, the particle size apparently increases with high weight ratio of co-solvent, but the particle size distribution was broader. The standard deviation of particle diameter is large when the co-solvent weight ratio is more than 0.35 and less than 0.15. However, the specific surface area was similar for all weight ratios ranging from 1000 to 1300 m2/g. The synthesized silica was spherical and has high specific surface area. The cobalt was impregnated onto the obtained silica to produce the cobalt catalyst used for CO2 hydrogenation.</

scholarly journals Nanosized TiO2Photocatalyst Powder via Sol-Gel Method: Effect of Hydrolysis Degree on Powder Properties

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Nor Hafizah ◽  
Iis Sopyan
Keyword(s):  
Crystal Structure ◽  
Surface Area ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Gel Method ◽  
Sol Gel Method ◽  
Hydrolysis Degree ◽  
Method Effect ◽  
Powder Properties ◽  
Dta Curves

NanosizedTiO2powder was synthesized via sol-gel method using titanium tetraisopoxide (TPT) as the precursor. Mol ratios of water to TPT were varied from 1 (Powder A), 2 (Powder B), 3 (Powder C), and 4 (Powder D) to evaluate effect of hydrolysis degree. TG/DTA curves showed that amorphous phase turned to anatase crystal structure at ca. 415, 337, 310, and339∘C for Powders A, B, C, and D, respectively. XRD analysis showed that all the synthesizedTiO2powders were 100% in anatase form with Powders B and C showing considerably higher crystallinities. The powders obtained at lower water to TPT mol ratios were spherical in shape and they became bar-like shapes higher mol ratios. The lower hydrolysis degree led to higher surface area of the Powder A (24.8 m2/g) compared to Powder B (14.6 m2/g). From phenol photocatalytic measurement, Powder B was the most efficient attributed to its higher crystallinity.

scholarly journals Green sol–gel route for selective growth of 1D rutile N–TiO2: a highly active photocatalyst for H2 generation and environmental remediation under natural sunlight

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 33029-33042 ◽  
Author(s):  
Supriya K. Khore ◽  
Navya Vani Tellabati ◽  
Sanjay K. Apte ◽  
Sonali D. Naik ◽  
Prashant Ojha ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Environmental Remediation ◽  
Sol Gel ◽  
Selective Growth ◽  
Gel Method ◽  
Natural Sunlight ◽  
Sol Gel Method ◽  
H2 Generation ◽  
Highly Active

We report selective growth of N–TiO2 1D nanorods using a green aqueous sol–gel method followed by hydrothermal treatment.

High surface area nickel aluminate spinels prepared by a sol–gel method

2001 ◽  
Vol 180 (3) ◽  
pp. 253-258 ◽  
Author(s):  
C. Otero Areán ◽  
M. Peñarroya Mentruit ◽  
A.J. López López ◽  
J.B. Parra
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Nickel Aluminate ◽  
Gel Method ◽  
Sol Gel Method

Synthesis of Nanostructured Tin Oxide by Sol–Gel and Sonochemical Approaches in an Ionic Liquid

2018 ◽  
Vol 232 (2) ◽  
pp. 245-256 ◽  
Author(s):  
Hala K. Farag ◽  
Hussein Abbas
Keyword(s):  
Ionic Liquid ◽  
Surface Area ◽  
Tin Oxide ◽  
Pore Diameter ◽  
Sol Gel ◽  
Sonochemical Method ◽  
Average Pore ◽  
Gel Method ◽  
Sol Gel Method ◽  
Tin Oxide Nanoparticles

AbstractThe present paper shows a comparative study on the synthesis of nanostructured tin oxide in the ionic liquid 1-ethyl-3-methylimidazolium trifluoromethylsulfonate ([EMIm]TfO) by sol–gel and sonochemical methods. The XRD results of the synthesized materials revealed the formation of single tetragonal phase of SnO2by sol–gel method whereas a mixture of tetragonal SnO and orthorhombic SnO2phases was obtained by the sonochemical method. The sonochemical approach led to the formation of finer nanoparticales with a higher specific surface area than that of the sol–gel synthesized oxide. The average sizes of tin oxide nanoparticles were found to be about 30 nm and 15 nm for the particles obtained by sol–gel and sonochemical methods, respectively. The surface area of SnO2nanopowder obtained by the sol–gel method (calcined at 500 °C) was estimated to be 11.6 m2g−1, and the mean pore diameter was found to be 6.33 nm. Whereas the mixed SnO/SnO2sample (calcined at 500 °C) obtained by the sonochemical method exhibited a higher surface area of 43.11 m2g−1and an average pore diameter of 1.90 nm. The band gap of the synthesized tin oxides was estimated from the UV-vis. results to be 4.01 and 4.25 eV for the sol–gel and sonochemically synthesized samples, respectively.

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