A Sol-Gel Ruthenium-Niobium-Silicon Mixed-Oxide Bifunctional Catalyst for the Hydrogenation of Levulinic Acid in the Aqueous Phase

ChemCatChem ◽  
2017 ◽  
Vol 9 (8) ◽  
pp. 1476-1486 ◽  
Author(s):  
Luciana Minieri ◽  
Serena Esposito ◽  
Vincenzo Russo ◽  
Barbara Bonelli ◽  
Martino Di Serio ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Mixed Oxide ◽  
Levulinic Acid ◽  
Sol Gel ◽  
Bifunctional Catalyst

scholarly journals Immobilization of an Iridium(I)-NHC-Phosphine Catalyst for Hydrogenation Reactions under Batch and Flow Conditions

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 656
Author(s):  
Henrietta Kovács ◽  
Krisztina Orosz ◽  
Gábor Papp ◽  
Ferenc Joó ◽  
Henrietta Horváth
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Aqueous Phase ◽  
Levulinic Acid ◽  
Flow Reactor ◽  
High Catalytic Activity ◽  
Flow Conditions ◽  
Hydrogenation Reactions ◽  
Excellent Selectivity

Na2[Ir(cod)(emim)(mtppts)] (1) with high catalytic activity in various organic- and aqueous-phase hydrogenation reactions was immobilized on several types of commercially available ion-exchange supports. The resulting heterogeneous catalyst was investigated in batch reactions and in an H-Cube flow reactor in the hydrogenation of phenylacetylene, diphenylacetylene, 1-hexyne, and benzylideneacetone. Under proper conditions, the catalyst was highly selective in the hydrogenation of alkynes to alkenes, and demonstrated excellent selectivity in C=C over C=O hydrogenation; furthermore, it displayed remarkable stability. Activity of 1 in hydrogenation of levulinic acid to γ-valerolactone was also assessed.

Aqueous-phase Hydrogenation of Levulinic Acid over Carbon Layer Protected Silica-supported Cobalt-Ruthenium Catalysts

2021 ◽  
Author(s):  
Lihua Qian ◽  
Guojun Lan ◽  
Xiaoyan Liu ◽  
Zhenqing Li ◽  
Ying Li
Keyword(s):  
Aqueous Phase ◽  
Levulinic Acid ◽  
Carbon Layer ◽  
Ruthenium Catalysts

Slurry photodegradation of 2,4-dichlorophenoxyacetic acid: A comparative study of impregnated and sol–gel In2O3–TiO2 mixed oxide catalysts

2008 ◽  
Vol 193 (2-3) ◽  
pp. 266-270 ◽  
Author(s):  
V. Rodríguez-González ◽  
A. Moreno-Rodríguez ◽  
M. May ◽  
F. Tzompantzi ◽  
R. Gómez
Keyword(s):  
Comparative Study ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Oxide Catalysts ◽  
Dichlorophenoxyacetic Acid ◽  
Mixed Oxide Catalysts ◽  
2,4 Dichlorophenoxyacetic Acid

Bisphenol A Imprinted SiO2‐ZrO2 Mixed Oxide Materials Prepared by Acetic Anhydride Sol‐Gel Method

2007 ◽  
Vol 37 (10) ◽  
pp. 771-777 ◽  
Author(s):  
Masahiro Fujiwara ◽  
Ikou Yamamura ◽  
Motoyasu Nishiyama ◽  
Kumi Shiokawa ◽  
Souichi Ohtsuki ◽  
...  
Keyword(s):  
Acetic Anhydride ◽  
Bisphenol A ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Oxide Materials ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals The Li+, Na+ and K+ ion exchange reaction process on the surface of mixed oxide SiO2/TiO2/Sb2O5 surface prepared by the sol-gel processing method

2005 ◽  
Vol 30 (1) ◽  
pp. 51-58 ◽  
Author(s):  
C. U. Ferreira ◽  
J. E. Gonçalves ◽  
Y. V. Kholin ◽  
Y. Gushikem
Keyword(s):  
Ion Exchange ◽  
Mixed Oxide ◽  
Exchange Process ◽  
Sol Gel ◽  
Exchange Capacity ◽  
Processing Method ◽  
Exchange Property ◽  
Ion Exchange Process ◽  
Ion Exchange Reaction ◽  
Gel Processing

The porous mixed oxide SiO2/TiO2/Sb2O5 obtained by the sol-gel processing method presented a good ion exchange property and a high exchange capacity towards the Li+, Na+ and K+ ions. In the H+/M+ ion exchange process, the H+ / Na+ could be described as presenting an ideal character. The ion exchange equilibria of Li+ and K+ were quantitatively described with the help of the model of fixed tetradentate centers. The results of simulation evidence that for the H+ / Li+ exchange the usual situation takes place: the affinity of the material to the Li+ ions is decreased with increasing the degree of ion exchange. On the contrary, for K+ the effects of positive cooperativity, that facilitate the H+ / K+ exchange, were revealed.

Aqueous-Phase Hydrogenation of Levulinic Acid Using Formic Acid as a Sustainable Reducing Agent Over Pt Catalysts Supported on Mesoporous Zirconia

2019 ◽  
Vol 8 (1) ◽  
pp. 393-402 ◽  
Author(s):  
M. Al-Naji ◽  
M. Popova ◽  
Z. Chen ◽  
N. Wilde ◽  
R. Gläser
Keyword(s):  
Formic Acid ◽  
Aqueous Phase ◽  
Levulinic Acid ◽  
Reducing Agent ◽  
Pt Catalysts ◽  
Mesoporous Zirconia

Development of Non-Silicate Microporous Membranes with High Chemical Resistance

2006 ◽  
Vol 45 ◽  
pp. 2043-2048
Author(s):  
Undine Aust ◽  
Gerhard Tomandl
Keyword(s):  
Mixed Oxide ◽  
Chemical Resistance ◽  
Sol Gel ◽  
Positive Influence ◽  
Oxide Systems ◽  
Polymeric Sol ◽  
High Chemical Resistance ◽  
Gel Technique ◽  
Final Composition ◽  
Oxide Membranes

TiO2-ZrO2 mixed-oxide membranes were prepared via polymeric sol-gel technique. The final composition is already predefined during the preparation of the sols by using the corresponding quantities of the starting alkoxides. The mixed-oxide membranes were characterized by Xray diffraction, nitrogen sorption, and field emission scanning electron microscopy as well as filtration and corrosion tests. The observed results prove the positive influence on the investigated properties by addition of a second oxide. Depending on the composition of the mixed-oxide membranes, a remarkable increase in the crystallization temperatures is demonstrated. Using mixed-oxide systems, the retardation of grain growth is confirmed.

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