A CaMnAl-hydrotalcite solid basic catalyst toward the aldol condensation reaction with a comparable level to liquid alkali catalysts

2018 ◽  
Vol 20 (13) ◽  
pp. 3071-3080 ◽  
Author(s):  
Weihan Bing ◽  
Huimin Wang ◽  
Lei Zheng ◽  
Deming Rao ◽  
Yusen Yang ◽  
...  
Keyword(s):  
Memory Effect ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Catalytic Performance ◽  
Basic Catalyst ◽  
Heterogeneous Catalytic ◽  
Comparable Level ◽  
Alkali Catalysts ◽  
Solid Basic Catalyst

A CaMnAl-hydrotalcite solid basic catalyst was prepared based on the memory effect of LDHs, which exhibited extremely high heterogeneous catalytic performance toward the aldol condensation reaction.

scholarly journals Preparation of two different crystal structures of cerous phosphate as solid acid catalysts: their different catalytic performance in the aldol condensation reaction between furfural and acetone

RSC Advances ◽  
2019 ◽  
Vol 9 (30) ◽  
pp. 16919-16928 ◽  
Author(s):  
Wenzhi Li ◽  
Mingxue Su ◽  
Tao Yang ◽  
Tingwei Zhang ◽  
Qiaozhi Ma ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Liquid Fuel ◽  
Solid Acid ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Catalytic Performance ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Aldehydes And Ketones ◽  
Aldol Condensation Reactions

Liquid fuel intermediates can be produced via aldol condensation reactions through furan aldehydes and ketones driven from biomass.

scholarly journals Catalytic Synthesis of Methacrolein via the Condensation of Formaldehyde and Propionaldehyde with L-Proline Intercalated Layered Double Hydroxides

Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 42
Author(s):  
Longxin Ju ◽  
Gang Li ◽  
Hongxian Luo
Keyword(s):  
Layered Double Hydroxides ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Catalytic Performance ◽  
Operating Conditions ◽  
Coupling Reactions ◽  
Reaction Conditions ◽  
Step Procedure ◽  
Aldol Condensation Reactions ◽  
Double Hydroxides

Aldol condensation reactions are very important C–C coupling reactions in organic chemistry. In this study, the catalytic performance of layered double hydroxides (LDHs) in the aldol condensation reaction of formaldehyde (FA) and propionaldehyde (PA) was investigated. The MxAl-LDHs (denoted as re-MxAl–LDHs; M = Ca and Mg; X = 2–4), as heterogeneous basic catalysts toward the aldol condensation reaction, were prepared via a two-step procedure. The catalyst exhibited a high PA conversion (82.59%), but the methacrolein (MAL) selectivity was only 36.01% due to the limitation of the alkali-catalyzed mechanism. On this basis, the direct intercalation of L-proline into LDHs also has been investigated. The influences of several operating conditions, including the temperature, reaction time, and substrate content, on the reaction results were systematically studied, and the optimized reaction conditions were obtained. The optimized Mg3Al–Pro-LDHs catalyst exhibited a much higher MAL selectivity than those of re-MgxAl–LDHs.

Preparation of sulphur-modified Mg-Al hydrotalcite and catalytic performance to the Aldol condensation reaction

2015 ◽  
Vol 45 (2) ◽  
pp. 194-201
Author(s):  
Xi Hu ◽  
Jinhua Liang ◽  
Feng Zhang ◽  
Junge Wang ◽  
Xiaoqian Ren
Keyword(s):  
Aldol Condensation ◽  
Condensation Reaction ◽  
Catalytic Performance

scholarly journals Nonanal Sensor Fabrication Using Aldol Condensation Reaction Inside Alkali-Resistant Porous Glass

2021 ◽  
pp. 1-1
Author(s):  
Masato Tsujiguchi ◽  
Takashi Aitoku ◽  
Hironori Takase ◽  
Yasuko Yamada Maru
Keyword(s):  
Porous Glass ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Sensor Fabrication

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

Liquid-phase aldol condensation of cyclohexanone on aluminium and iron oxides

1982 ◽  
Vol 47 (8) ◽  
pp. 2235-2245 ◽  
Author(s):  
Zdeněk Vít ◽  
Lubomír Nondek ◽  
Jaroslav Málek
Keyword(s):  
Iron Oxides ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Complex Function ◽  
Acid Sites ◽  
Basic Site ◽  
Catalyst Poisoning ◽  
Iron Hydroxides ◽  
Transient Complex ◽  
Kinetics Of

The kinetics of the aldol condensation of cyclohexanone in decalin were investigated at 210 °C on catalysts prepared by drying and calcining the aluminium and iron hydroxides at 110-850 °C. The effect of catalyst poisoning by benzoic acid and pyridine on the course of the condensation reaction and aldol retroaldolisation was also examined. The kinetics of the cyclohexanone condensation can be described by means of Langmuir-Hinshelwood equations which are in agreement with a mechanism involving adsorption of cyclohexanone on a basic site to form a transient complex, reaction of this complex with a cyclohexanone molecule affording the aldol, the rate determining interaction of the aldol with free basic and acid sites yielding 2-(1-cyclohexen-1-yl)cyclohexanone and water and desorption of these products from the catalyst surface. The proposed kinetic model is supported by the results of catalyst poisoning. The activity of aluminium and iron oxides in the condensation of cyclohexanone is a complex function of their basicity and acidity depending strongly on the calcination temperature.

Chemical conversion based on crystal facet effect of transition metal oxide and construction methods for sharp-faced nanocrystals

2022 ◽  
Author(s):  
huixiang wang ◽  
Xiaobo Ren ◽  
Zhong Liu ◽  
Baoliang Lv
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Gas Sensing ◽  
Transition Metal Oxide ◽  
Chemical Conversion ◽  
Catalytic Performance ◽  
Crystal Facet ◽  
Heterogeneous Catalytic ◽  
Construction Methods

The in-depth researches have found that the nanocrystal facet of transition metal oxide (TMO) greatly affects its heterogeneous catalytic performance, as well as the property of photocatalysis, gas sensing, electrochemical...

Sign in / Sign up

Export Citation Format

Share Document