scholarly journals Novel Polymer–Silica Composite-Based Bifunctional Catalysts for Hydrodeoxygenation of 4-(2-Furyl)-3-Buten-2-One as Model Substance for Furfural–Acetone Aldol Condensation Products

2019 ◽  
Vol 9 (12) ◽  
pp. 2438 ◽  
Author(s):  
Michael Goepel ◽  
Ruben Ramos ◽  
Roger Gläser ◽  
David Kubička
Keyword(s):  
Noble Metals ◽  
Aldol Condensation ◽  
Sol Gel ◽  
Reaction Networks ◽  
Bifunctional Catalysts ◽  
Acidic Properties ◽  
Condensation Products ◽  
Silica Composite ◽  
Model Substance ◽  
High Yields

Novel bifunctional metal-loaded polymer–silica composite (PSC) catalysts were investigated in the hydrodeoxygenation (HDO) of 4-(2-furyl)-3-buten-2-one (FAc) as a model substance for furfural–acetone aldol condensation products. PSC catalysts were synthesized via a sol–gel method with different polymer contents and subsequently doped with different noble metals. The product composition of the HDO of FAc could be tuned by using catalysts with different polymer (i.e., acidic properties) and metal content (i.e., redox properties), showing the great potential of metal-loaded PSC materials as tunable catalysts in biomass conversions with complex reaction networks. Furthermore, high yields (>90%) of the fully hydrodeoxygenated product (n-octane) could be obtained using noble metal-loaded PSC catalysts in only 8 h of reaction time.

ChemInform Abstract: ALDOL-CONDENSATION PRODUCTS FROM THE MULTIPLE ANIONS OF OXIMES, BENZANILIDES, A BENZAMIDE, AND O-TOLYLANILIDES

1978 ◽  
Vol 9 (32) ◽  
Author(s):  
C. F. BEAM ◽  
C. A. PARK ◽  
D. C. REAMES ◽  
S. A. MILLER ◽  
C. R. HAUSER
Keyword(s):  
Aldol Condensation ◽  
Condensation Products

Sol-Gel Synthesis and Characterisation of Nanoscopic FeF3-MgF2Heterogeneous Catalysts with Bi-Acidic Properties

ChemCatChem ◽  
2013 ◽  
Vol 5 (8) ◽  
pp. 2223-2232 ◽  
Author(s):  
Ying Guo ◽  
Piotr Gaczyński ◽  
Klaus-Dieter Becker ◽  
Erhard Kemnitz
Keyword(s):  
Sol Gel ◽  
Acidic Properties ◽  
Sol Gel Synthesis

scholarly journals Specific-Ion Effects Directed Noble Metal Aerogels: Versatile Manipulation for Electrocatalysis and Beyond

2019 ◽  
Author(s):  
RAN DU ◽  
YUE HU ◽  
René Hübner ◽  
Jan-Ole Joswig ◽  
Xuelin Fan ◽  
...  
Keyword(s):  
Porous Materials ◽  
Noble Metal ◽  
Noble Metals ◽  
Sol Gel ◽  
Synthetic Methods ◽  
Superior Performance ◽  
Gelation Mechanism ◽  
Practical Applications ◽  
Specific Ion Effects ◽  
Ion Effects

<div>Noble metal foams (NMFs) are a new class of functional porous materials featuring properties of both noble metals and monolithic porous materials, providing impressive prospects in catalysis, bio-sensing, plasmonic technologies, etc...Among reported synthetic methods to date, the sol-gel approach manifests overwhelming advantages for versatile synthesis of controlled nanostructured NMFs under mild condition. However, limited gelation methods and insufficient understanding of the underlying mechanism retards structure/composition manipulation of NMFs, hampering ondemand designing for practical applications. Herein highly tunable NMFs are fabricated at room temperature by activating specific-ion effects and regulating ion-nanoparticle interactions, affording various single/alloy NMFs with adjustable compositions (Au, Ag, Pd, Pt), ligament sizes (3.1~142.0 nm), and special morphologies. Their superior performance in programmable self-propulsion devices and electrocatalytic alcohol oxidation are demonstrated. This study provides not only a conceptually new route to fabricate and manipulate functional NMFs, but also an overall picture in understanding the gelation mechanism. It may pave the way for on-target designing versatile NMFs for various applications.</div>

The aldol condensation of lower aldehydes over MFI zeolites with different acidic properties

2001 ◽  
Vol 43 (3) ◽  
pp. 341-359 ◽  
Author(s):  
Emil Dumitriu ◽  
Vasile Hulea ◽  
Ioana Fechete ◽  
Aline Auroux ◽  
Jean-François Lacaze ◽  
...  
Keyword(s):  
Aldol Condensation ◽  
Acidic Properties ◽  
Mfi Zeolites

Crystalline and amorphous aluminosilicates with different pore structures for the synthesis of pyridines

2017 ◽  
Vol 41 (5) ◽  
pp. 253-261 ◽  
Author(s):  
Nellya G. Grigor'eva ◽  
Nadezhda A. Filippova ◽  
Marat R. Agliullin ◽  
Boris I. Kutepov ◽  
Nama Narender
Keyword(s):  
Sol Gel ◽  
Catalytic Synthesis ◽  
Maximum Amount ◽  
Macroporous Structure ◽  
Acidic Properties ◽  
Mesoporous Aluminosilicates ◽  
Zeolite Framework ◽  
Narrow Pore Size Distribution ◽  
Heterogeneous Catalytic ◽  
Sol Gel Synthesis

The heterogeneous catalytic synthesis of pyridine and methylpyridines (picolines) was carried out by the reaction of ethanol with formaldehyde and ammonia over aluminosilicates with different acidic properties and textural characteristics: zeolite framework-type FAU in H-form with microporous (H-Y) and micro-meso-macroporous structure (H-Y-mmm) and mesoporous aluminosilicates, obtained by sol-gel synthesis in an alkaline medium (ASM-1) and under variable pH (ASM-2). It is shown that the highest catalytic activity is characteristic of ASM-2 (Si/Al = 40) with a narrow pore size distribution within the range 2 to 5 nm and containing strongly acidic bridging Si–OH–Al groups on the surface. The products of the reaction of ethanol with formaldehyde and ammonia on the catalysts studied are dominated by picolines; the maximum amount of picolines (60%) is formed on the H-Y-mmm and aluminosilicate ASM-2 samples.

scholarly journals Specific ion effects directed noble metal aerogels: Versatile manipulation for electrocatalysis and beyond

2019 ◽  
Vol 5 (5) ◽  
pp. eaaw4590 ◽  
Author(s):  
Ran Du ◽  
Yue Hu ◽  
René Hübner ◽  
Jan-Ole Joswig ◽  
Xuelin Fan ◽  
...  
Keyword(s):  
Noble Metal ◽  
Noble Metals ◽  
Sol Gel ◽  
Functional Materials ◽  
Synthetic Methods ◽  
Superior Performance ◽  
Formation Mechanisms ◽  
Gelation Mechanism ◽  
Specific Ion Effects ◽  
Ion Effects

Noble metal foams (NMFs) are a new class of functional materials featuring properties of both noble metals and monolithic porous materials, providing impressive prospects in diverse fields. Among reported synthetic methods, the sol-gel approach manifests overwhelming advantages for versatile synthesis of nanostructured NMFs (i.e., noble metal aerogels) under mild conditions. However, limited gelation methods and elusive formation mechanisms retard structure/composition manipulation, hampering on-demand design for practical applications. Here, highly tunable NMFs are fabricated by activating specific ion effects, enabling various single/alloy aerogels with adjustable composition (Au, Ag, Pd, and Pt), ligament sizes (3.1 to 142.0 nm), and special morphologies. Their superior performance in programmable self-propulsion devices and electrocatalytic alcohol oxidation is also demonstrated. This study provides a conceptually new approach to fabricate and manipulate NMFs and an overall framework for understanding the gelation mechanism, paving the way for on-target design of NMFs and investigating structure-performance relationships for versatile applications.

The effect of the position of the methyl group on the helical twisting powers of aldol condensation products of methyl cyclohexanones

2002 ◽  
Vol 29 (7) ◽  
pp. 995-1000 ◽  
Author(s):  
J. Lub ◽  
W. Ten Hoeve ◽  
W. P. M. Nijssen ◽  
L. Diaz ◽  
R. T. Wegh
Keyword(s):  
Aldol Condensation ◽  
Methyl Group ◽  
Condensation Products
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