scholarly journals A Comparative Study of Aromatization Catalysts: The Advantage of Hybrid Oxy/Carbides and Platinum-Catalysts Based on Carbon Gels

2021 ◽  
Vol 7 (1) ◽  
pp. 21
Author(s):  
Luisa M. Pastrana-Martínez ◽  
Sergio Morales-Torres ◽  
Francisco J. Maldonado-Hódar
Keyword(s):  
Surface Chemistry ◽  
Metal Oxides ◽  
High Performance ◽  
Noble Metals ◽  
Sol Gel ◽  
Catalytic Performance ◽  
One Pot ◽  
Carbon Gels ◽  
Sol Gel Synthesis ◽  
The Relationship

This manuscript is focused on the relationship between sol-gel synthesis processes and the development of new active phases with fitted morphology, porosity and surface chemistry. The influence of the above parameters on the catalytic performance of the prepared materials for the aromatization of n-hexane to benzene is also evaluated. Different series of catalysts were prepared, either using noble metals (i.e., Pt) or metal oxides (i.e., Mo, W), as active phases. In both cases, the catalytic performance and stability of classical aromatization catalysts was significantly improved. Interesting one-pot carboreduction process of the metal oxide during carbonization is suggested as a real alternative for the preparation of high-performance aromatization catalysts, leading to the formation of less acidic and non-stoichiometric oxides and carbides.

One-pot sol-gel synthesis of Si/C yolk-shell anodes for high performance lithium-ion batteries

2020 ◽  
Vol 835 ◽  
pp. 155135 ◽  
Author(s):  
Wei Zhang ◽  
Jianjiang Li ◽  
Peng Guan ◽  
Chunxiao Lv ◽  
Chao Yang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Sol Gel ◽  
Lithium Ion ◽  
One Pot ◽  
Sol Gel Synthesis

scholarly journals Organosulfur adsorbents by self-assembly of titania based ternary metal oxide nanofibers

2017 ◽  
Vol 5 (20) ◽  
pp. 9561-9571 ◽  
Author(s):  
Ruohong Sui ◽  
Sarah K. Carefoot ◽  
Christopher B. Lavery ◽  
Connor E. Deering ◽  
Kevin L. Lesage ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Self Assembly ◽  
Selective Adsorption ◽  
Sol Gel ◽  
One Pot ◽  
Ternary Metal ◽  
Sol Gel Synthesis

One-pot sol–gel synthesis of ternary metal oxides for selective adsorption of thiols from H2S/CO2-containing gas.

scholarly journals One pot transparent sol-gel synthesis of TiO2 nanospheres with pristine anatase phase and their physicochemical characteristics

2016 ◽  
Vol 2 (1) ◽  
pp. 23-30 ◽  
Author(s):  
O.S.N. Ghosh ◽  
◽  
S. Gayathri ◽  
D. Alagarasan ◽  
K.V.P. Kumar ◽  
...  
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Physicochemical Characteristics ◽  
One Pot ◽  
Sol Gel Synthesis

scholarly journals Catalytic myrtenol amination over gold, supported on alumina doped with ceria and zirconia

2018 ◽  
Vol 5 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Yu.S. Demidova ◽  
I.L. Simakova ◽  
E.V. Suslov ◽  
K.P. Volcho ◽  
N.F. Salakhutdinov ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Sol Gel ◽  
Gold Catalyst ◽  
Catalyst Support ◽  
Acid Sites ◽  
One Pot ◽  
Gel Method ◽  
Sol Gel Method ◽  
Alcohol Activation ◽  
The One

Abstract In the current work gold catalysts supported on both commercial oxides and oxides synthesized by the sol-gel method were used for the one-pot alcohol amination of myrtenol. In general, utilization of metal oxides synthesized by the sol-gel method as the gold catalyst support enhanced the knowledge regarding key parameters determining catalytic behavior. Synthesized alumina was characterized by stronger acid sites favoring primary amine accumulation on the catalyst surface, as compared to the commercial oxide. Utilization of mixed metal oxides synthesized by the sol-gel method resulted in the non-additive behavior of different oxides enhancing the catalytic activity. Introduction of ceria into alumina modified the support basicity resulting in more efficient alcohol activation.

scholarly journals A mesostructured hybrid CTA–silica carrier for curcumin delivery

2020 ◽  
Vol 96 (1) ◽  
pp. 236-246
Author(s):  
Marta Gallo ◽  
Fabio Giudice ◽  
Mauro Banchero ◽  
Silvia Ronchetti ◽  
Luigi Manna ◽  
...  
Keyword(s):  
Water Solubility ◽  
Uv Spectroscopy ◽  
Sol Gel ◽  
Topical Administration ◽  
Release Mechanism ◽  
Active Principle ◽  
One Pot ◽  
Drug Release Mechanism ◽  
Sol Gel Synthesis ◽  
First Time

Abstract Curcumin is a natural active principle with antioxidant, antibacterial and anti-inflammatory properties. Its use is limited by a low water solubility and fast degradation rate, which hinder its bioavailability. To overcome this problem, curcumin can be delivered through a carrier, which protects the drug molecule and enhances its pharmacological effects. The present work proposes a simple one-pot sol–gel synthesis to obtain a hybrid carrier for curcumin delivery. The hybrid consists of a mesostructured matrix of amorphous silica, which stabilizes the carrier, and hexadecyltrimethylammonium (CTA), a surfactant where curcumin is dissolved to increase its water solubility. The carrier was characterized in terms of morphology (FESEM), physicochemical properties (XRD, FTIR, UV spectroscopy) and release capability in pseudo-physiological solutions. Results show that curcumin molecules were entrapped, for the first time, in a silica-surfactant mesostructured hybrid carrier. The hybrid carrier successfully released curcumin in artificial sweat and in a phosphate buffer saline solution, so confirming its efficacy in increasing curcumin water solubility. The proposed drug release mechanism relies on the degradation of the carrier, which involves the concurrent release of silicon. This suggests strong potentialities for topical administration applications, since curcumin is effective against many dermal diseases while silicon is beneficial to the skin.

Silica-supported NiO nanocomposites prepared via a sol–gel technique and their excellent catalytic performance for one-pot multicomponent synthesis of benzodiazepine derivatives under microwave irradiation

2017 ◽  
Vol 41 (13) ◽  
pp. 5893-5903 ◽  
Author(s):  
Zeba Nasir ◽  
Abad Ali ◽  
Mohammad Shakir ◽  
Rizwan Wahab ◽  
Shamsuzzaman Shamsuzzaman ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Benzodiazepine Derivatives ◽  
Gel Technique ◽  
The One ◽  
Excellent Catalytic Performance

Heterogeneous and versatile NiO–SiO2 NCs were synthesized by a sol–gel technique and used as a catalyst for the one-pot multicomponent synthesis of benzodiazepines.

Comparison of Several CU(I) and CU(II) Precursors for the Sol-Gel Preparation of High TC Superconducting Metal Oxides

1988 ◽  
Vol 121 ◽  
Author(s):  
Mariquita A. Accibal ◽  
Jonathan W. Draxton ◽  
Allen H. Gabor ◽  
Wayne L. Gladfelter ◽  
Beth Anne Hassler ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxides ◽  
Coordination Compounds ◽  
Sol Gel ◽  
High Tc ◽  
Superconducting Metal ◽  
Zero Resistance ◽  
Gel Preparation ◽  
Sol Gel Synthesis

ABSTRACTA comparison of the use of three different coordination compounds of copper as precursors for the sol-gel synthesis of YBa2Cu3O7-δ has been made. For yttrium, the tris(isopropoxide) was used exclusively, while the use of both Ba(O-i-Pr)2 and Ba(OCH2CH2OEt)2 (prepared in situ from Ba metal) as sources for Ba were studied. After dissolving Y(O-i-pr)3, a Ba source, and the copper(I) alkoxide, [Cu(O-i-Bu)]4, hydrolysis led immediately to an orange gelatinous solid which yielded YBa2Cu3O7-δ upon firing in oxygen. Copper(II) acetate was found to give heterogeneous mixtures under our conditions and was not further studied. Copper(II) acac (acac = acetylacetonate) yielded the best results. Partially hydrolyzed solutions of Cu(acac)2, Ba(OCH2CH2OEt)2, and Y(O-i-pr)3 were spin coated on SrTi03 (100) and fired under oxygen to give oriented (b axis normal to the surface) thin films of YBa2Cu3O7-δ. The onset of superconductivity for the films was 92 K, but they did not reach zero resistance until much lower temperatures.

Eu3+-doped CdS nanocrystals in SiO2matrices: one-pot sol–gel synthesis and optical characterization

2006 ◽  
Vol 16 (47) ◽  
pp. 4612-4618 ◽  
Author(s):  
Beatriz Julián ◽  
José Planelles ◽  
Eloisa Cordoncillo ◽  
Purificación Escribano ◽  
Patrick Aschehoug ◽  
...  
Keyword(s):  
Sol Gel ◽  
Optical Characterization ◽  
One Pot ◽  
Cds Nanocrystals ◽  
Sol Gel Synthesis
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