scholarly journals Ionic Liquids/SiO2 Supporting Pd Nanoparticles: Efficient Catalysts in Hydrogenation Reaction

2021 ◽  
pp. 8-12
Author(s):  
Hartz Taís ◽  
Fischer Daiane ◽  
Karina de Fraga ◽  
Scheeren Carla
Keyword(s):  
Ionic Liquids ◽  
Palladium Nanoparticles ◽  
Sol Gel ◽  
Pd Nanoparticles ◽  
Hydrogenation Reaction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sol Gel Process ◽  
Acidic Conditions ◽  
Palladium Content

Palladium nanoparticles (ca. 4.8 nm) were synthesized in presence of 1-n-butyl-3-methylimidazolium tetraflouroborate (BMI.BF4) and 1-n-butyl-3-methylimidazolium hexafluorophosphate (BMI.PF6) and PMI.Si.(OMe)3.Cl functionalized ionic liquids using the sol-gel method. The characteristics of the sol-gel method, ionic liquid on the palladium content was studied, as well as the silica morphology and texture of the support and the hydrogenation activity. The palladium content in the resulting xerogels (ca. 0.22 wt% Pd/SiO2) was shown to be independent of the sol-gel process. The xerogels synthesized in acidic conditions formed materials with larger pore diameters, which in turn might be responsible for the higher catalytic activity in hydrogenation of the alkenes and arenes obtained with the heterogeneous catalyst (Pd/ILs/SiO2).

DIFFERENT MORPHOLOGIES OFTiO2NANOSTRUCTURES IN ACIDIC AND BASIC SOL–GEL METHOD

NANO ◽  
2010 ◽  
Vol 05 (05) ◽  
pp. 279-285 ◽  
Author(s):  
M. H. IMANIEH ◽  
Y. VAHIDSHAD ◽  
P. NOURPOUR ◽  
S. SHAKESI ◽  
K. SHABANI
Keyword(s):  
Ph Value ◽  
Sol Gel ◽  
Simple Method ◽  
Gel Method ◽  
Sol Gel Method ◽  
New Process ◽  
Nanocrystalline Titanium ◽  
Acidic Conditions ◽  
Nanocrystalline Titanium Dioxide ◽  
First Time

In this research, nanocrystalline titanium dioxide (TiO2) particles were prepared by a modified alkoxide technique under basic and acidic conditions at room temperatures. A simple method for preparing different morphology of TiO2has been developed. The reaction condition was used to control the crystalline size, phase and morphology of the TiO2nanostructures. In this process by adjusting the Rw(water to precursor ratio) and pH value the hydrolysis and condensation reactions were controlled. This led to the development of a new process to produce TiO2nanorod (for the first time by sol–gel method) at high pH value (basic) while the water content was sufficient whereas at low pH value (acidic) nanosphere TiO2were obtained. The powders were characterized by DTA, XRD, FE-SEM and UV–vis techniques and their physical properties were compared.

PRODUCTION AND CHARACTERIZATION OF ALUMINA NANOPARTICLES FROM GIRO CLAY VIA ACID LEACHING WITH SOL GEL METHOD

2021 ◽  
Vol 15 (1) ◽  
pp. 1-10
Author(s):  
S. O. Balogun ◽  
S. A. Yaro ◽  
M. Abdulwahab ◽  
A. Kasim
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Acid Leaching ◽  
Alumina Nanoparticles ◽  
High Alumina ◽  
Spectroscopic Techniques ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sol Gel Process ◽  
Ph Range

Alumina nanoparticles were synthesized from locally available high alumina clay, obtained from Giro in Kabbi State, through acid leaching with sol-gel method. The clay was leached with hydrofluoric acid and the aluminous solution produced was used as precursor to synthesis nanoparticles through sol gel process. The composition and structure of the clay and the particles produced were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction and fluorescence Spectroscopic techniques, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). From the analyses, the clay sample was observed to be high in alumina and predominantly Kaolinitic in nature. During the sol-gel process, effective flocculation was obtained at slightly alkaline pH range (7.6 to 8.0) and a relative moderate temperature of 80oC. The result also shows that the aging time of the gel affected the size of the particles produced during the process, and the particles are mainly nano-alumina.

Synthesis of Robust MOF-Derived Cu/SiO2 Catalyst with Low Copper Loading via Sol–Gel Method for the Dimethyl Oxalate Hydrogenation Reaction

ACS Catalysis ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 3382-3394 ◽  
Author(s):  
Run-Ping Ye ◽  
Ling Lin ◽  
Chong-Chong Chen ◽  
Jin-Xia Yang ◽  
Fei Li ◽  
...  
Keyword(s):  
Sol Gel ◽  
Hydrogenation Reaction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Dimethyl Oxalate

A highly active Pd/H-ZSM-5 catalyst in lean methane combustion prepared via a sol–gel method and treated by reduction–oxidation

2020 ◽  
Vol 44 (10) ◽  
pp. 3940-3949 ◽  
Author(s):  
Chao Fan ◽  
Li Yang ◽  
Li Luo ◽  
Zhiwei Wu ◽  
Zhangfeng Qin ◽  
...  
Keyword(s):  
Sol Gel ◽  
Methane Combustion ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Oxidation Treatment ◽  
Gel Method ◽  
Sol Gel Method ◽  
Highly Active ◽  
Metal Support ◽  
Metal Support Interactions

The reduction–oxidation treatment can reconstruct Pd nanoparticles, strengthen metal–support interactions and enhance catalytic performance of Pd/H-ZSM-5 in methane combustion.

Preparation of Nano Pd/C Catalyst for Purification of Terephthalic Acid by Sol-Gel Method

2013 ◽  
Vol 662 ◽  
pp. 153-157
Author(s):  
Fa Xin Xiao ◽  
Yan Song Li ◽  
Xin Yang Xu ◽  
Yong Peng Ren ◽  
Xiao Ni Shen
Keyword(s):  
Traditional Method ◽  
Terephthalic Acid ◽  
Reduction Method ◽  
Sol Gel ◽  
Preparation Technology ◽  
Gel Method ◽  
Sol Gel Method ◽  
Two Factors ◽  
Palladium Particles ◽  
Palladium Content

The traditional method of preparing 0.5 wt.% nano Pd/C catalysts used for pure terephthalic acid(PTA) refining is the precipitate-reduction method, and this paper proposed the sol-gel method, in which the palladium colloid was firstly prepared, and followed by the load process onto the activated carbon. The activity and microstructure of catalysts were investigated by means of SEM, TEM, EDS，XRD and HPLC. It was found that the activity of catalyst with the sol-gel method was much higher than that with precipitate-reduction method. The preparation technology has less effects on the micostructure of Pd/C catalysts, while the palladium particles of catalyst obtained with sol-gel method are much finer and the relatively palladium content is much higher.These two factors contribute to the higher activity of Pd/C catalyst.

Activating Pd nanoparticles on sol–gel prepared porous g-C3N4/SiO2via enlarging the Schottky barrier for efficient dehydrogenation of formic acid

2016 ◽  
Vol 3 (9) ◽  
pp. 1124-1129 ◽  
Author(s):  
Hong-Hui Wang ◽  
Bing Zhang ◽  
Xin-Hao Li ◽  
Markus Antonietti ◽  
Jie-Sheng Chen
Keyword(s):  
Formic Acid ◽  
Schottky Barrier ◽  
Hydrogen Generation ◽  
Sol Gel ◽  
Pd Nanoparticles ◽  
Gel Method ◽  
Sol Gel Method

The g-C3N4/SiO2 nanocomposite was prepared via a sol–gel method to activate Pd nanoparticles for hydrogen generation from formic acid.

scholarly journals PVP-Stabilized Palladium Nanoparticles in Silica as Effective Catalysts for Hydrogenation Reactions

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Caroline Pires Ruas ◽  
Daiane Kessler Fischer ◽  
Marcos Alexandre Gelesky
Keyword(s):  
Catalytic Activity ◽  
Palladium Nanoparticles ◽  
Sol Gel ◽  
Molar Ratio ◽  
Sol Gel Process ◽  
Hydrogenation Reactions ◽  
Acidic Conditions

Palladium nanoparticles stabilized by poly (N-vinyl-2-pyrrolidone) (PVP) can be synthesized by corresponding Pd(acac)2(acac = acetylacetonate) as precursor in methanol at 80°C for 2 h followed by reduction with NaBH4and immobilized onto SiO2prepared by sol-gel process under acidic conditions (HF or HCl). The PVP/Pd molar ratio is set to 6. The effect of the sol-gel catalyst on the silica morphology and texture and on Pd(0) content was investigated. The catalysts prepared (ca.2% Pd(0)/SiO2/HF andca.0,3% Pd(0)/SiO2/HCl) were characterized by TEM, FAAS, and SEM-EDS. Palladium nanoparticles supported in silica with a size 6.6 ± 1.4 nm were obtained. The catalytic activity was tested in hydrogenation of alkenes.

Preparation and Characterization of Epitaxial KNBO3 Thin Films by a Sol-Gel Method

1993 ◽  
Vol 310 ◽  
Author(s):  
Hidehiro Endo ◽  
M. J. Cima
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Grain Growth ◽  
Sol Gel ◽  
Soaking Time ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sol Gel Process ◽  
Surface Morphologies

AbstractEpitaxial formation of KNbO3 films on several substrates was examined. The films were prepared by a sol-gel process using potassium ethoxide and niobium pentaethoxide. Hetero-epitaxial KNbO3 films with (100) orientation were successfully obtained both on MgO (100) and SrTiO3 (100) substrates by heat treatments above 700°C, while polycrystalline KNbO3 were formed on Si (111) substrates. Higher temperatures and extended soaking time promoted the grain growth of KNbO3 and KNbO3 films with improved surface morphologies (smoother surfaces) could be obtained by controlling heat treatment parameters.

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