scholarly journals Influence of Pd and Pt Promotion in Gold Based Bimetallic Catalysts on Selectivity Modulation in Furfural Base-Free Oxidation

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1226
Author(s):  
Hisham K. Al Rawas ◽  
Camila P. Ferraz ◽  
Joëlle Thuriot-Roukos ◽  
Svetlana Heyte ◽  
Sébastien Paul ◽  
...  
Keyword(s):  
Aerobic Oxidation ◽  
Maximum Yield ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Metal Ratio ◽  
Nanoparticulate Systems ◽  
Free Oxidation ◽  
Standard Techniques ◽  
Catalytic Performances

Furfural (FF) has a high potential to become a major renewable platform molecule to produce biofuels and bio-based chemicals. The catalytic performances of AuxPty and AuxPdy bimetallic nanoparticulate systems supported on TiO2 were studied in a base-free aerobic oxidation of furfural to furoic acid (FA) and maleic acid (MA) in water. The characterization of the catalysts was performed using standard techniques. The optimum reaction conditions were also investigated, including the reaction time, the reaction temperature, the metal ratio, and the metal loading. The present work shows a synergistic effect existing between Au, Pd, and Pt in the alloy, where the performances of the catalysts were strongly dependent on the metal ratio. The highest selectivity (100%) to FA was obtained using Au3-Pd1 catalysts, with 88% using 0.5% Au3Pt1 with about 30% of FF conversion at 80 °C. Using Au-Pd-based catalysts, the maximum yield of MA (14%) and 5% of 2(5H)-furanone (FAO) were obtained by using a 2%Au1-Pd1/TiO2 catalyst at 110 °C.

Synthesis and Characterization of Substituted μ-oxo-bis[tetra-phenylporphyrinatoiron] Compounds

2015 ◽  
Vol 748 ◽  
pp. 183-186
Author(s):  
Zhi Cheng Sun ◽  
Shu Ying Chen ◽  
Zhi Peng Guo ◽  
Mei Juan Cao ◽  
Lu Hai Li
Keyword(s):  
Infrared Spectra ◽  
Elemental Analysis ◽  
Aromatic Aldehydes ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Reaction Conditions ◽  
One Pot ◽  
Optimum Reaction ◽  
Novel Method

A novel one-pot method for the synthesis of substituted μ-oxo-bis [tetraphenyl porphyrinatoiron] compounds ([TRPPFe]2O) from pyrrole and aromatic aldehydes was proposed and investigated in this paper. Four kinds of [TRPPFe]2O were designed and synthesized by one-pot reaction and characterized by elemental analysis, infrared spectra and ultraviolet-visible spectroscopy. Moreover, the [TRPPFe]2O yields of 18.7~22.4% could be obtained with this novel method under the optimum reaction conditions.

scholarly journals Synthesis and characterization of silver doped magnetic-nanoclay montmorillonite/iron oxide/silver nanocomposite for environmental applications throught effective dye degradation

2021 ◽  
Author(s):  
Musa Kazim Acar ◽  
Türkan Altun ◽  
Ilkay Hilal Gubbuk
Keyword(s):  
Iron Oxide ◽  
Dye Degradation ◽  
Chemical Reduction ◽  
Precipitation Method ◽  
Reaction Conditions ◽  
First Order Kinetics ◽  
Optimum Reaction ◽  
Silver Nanocomposite ◽  
Co Precipitation

Abstract Magnetic-nanoclay montmorillonite/iron oxide (MMT/Fe 3 O 4 ) nanocomposite was prepared by co-precipitation method and montmorillonite/iron oxide/silver (MMT/Fe 3 O 4 /Ag) nanocomposite was synthesized, called as chemical reduction method, by reduction of silver nitrate (AgNO 3 ) salt with sodium borohydride (NaBH 4 ) as reducing agent. These nanocomposites were characterized by Branuer-Emmet-Teller Surface Area and Porosity Dimension (BET), X-Ray Diffractometer (XRD), Fourier Transform Infrared Spectrum (FTIR), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM). Subsequently, MMT/Fe 3 O 4 /Ag was used in degradation of Rhodamine B (RhB) in the presence of NaBH 4 to evaluate catalytic activity of its and consequences were monitored using UV-Visible Spektrofotometer (UV-Vis). Moreover, various parameters including pH, catalyst dosage, initial dye concentration and amount of NaBH 4 were investigated for optimum reaction conditions. The reduction reactions followed pseudo-first order kinetics and complete degradation of RhB were achieved in 8 minutes using MMT/Fe 3 O 4 /Ag as catalysts while degradation of %46 of RhB were achieved in 60 minutes using MMT/Fe 3 O 4 .

Structure of Bridged Silsesquioxane Material Bearing a Pendant Dodecylamine

2014 ◽  
Vol 989-994 ◽  
pp. 739-742
Author(s):  
De Rong Lin ◽  
Li Jiang Hu
Keyword(s):  
Structure Characterization ◽  
Reaction Conditions ◽  
Water Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Bridged Silsesquioxane ◽  
Optimum Reaction ◽  
Acid Catalyzed ◽  
Synthesized Materials

In this study, the optimum reaction conditions of preparing bridged monomer by dodecylamine (DDA) and of γ-(2,3-epoxypropyl) trimethoxysilane (GPMS) were obtained at 60°C water bath for 36h. The synthesized materials were characterized by infrared spectroscopy (IR), atomic force microscopy (AFM), Scanning Electron Microscopy (SEM) and water contact angle (CA). The result of FTIR indicates the formation of the DDA and GPMS bonded reactions during the synthesis of monomer, and preparation of the skeleton structure. Characterization of AFM on the structure of the surface morphology of the acid-catalyzed materials indicates the formation of layered structure. The acid-catalyzed materials were characterized by SEM indicates the rough structure of micron-level, which was conducive to the hydrophobic properties of the material.

Preparation and Characterization of Aluminum Nitride Nano-Wire

2013 ◽  
Vol 274 ◽  
pp. 398-401
Author(s):  
Yan Long Sun ◽  
Yin Chan Liang ◽  
Ming Le Zhi ◽  
Zhao Fen Zeng ◽  
Li Min Dong
Keyword(s):  
Aluminum Nitride ◽  
Reaction Temperature ◽  
Average Diameter ◽  
Holding Time ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Double Decomposition ◽  
Microscopy Characterization

Aluminum nitride (AlN) nano-wire was synthesized by double decomposition with AlCl3 and NaN3 in stainless steel cauldron without solvent and using Mg as promoter. The effect of reaction temperature, holding time and promoter to the structure, surface morphology and particle size are analyzed. The synthesized AlN was characterized using X-ray diffraction (XRD) and scanning electronic microscopy (SEM). A series of electron microscopy characterization results show that the optimum reaction conditions are as follows: reaction temperature is 450°C and holding time is 8h. The average diameter of AlN nano-wire is 100nm.

Synthesis and Characterization of Glucose Dehydroabietate

2011 ◽  
Vol 396-398 ◽  
pp. 1260-1264 ◽  
Author(s):  
Zhan Wan Shi ◽  
Ying Wang ◽  
Yuan Mei Nie ◽  
Xing Dong Yao
Keyword(s):  
Surface Activity ◽  
Raw Materials ◽  
Acid Group ◽  
Dehydroabietic Acid ◽  
Reaction Conditions ◽  
Good Surface ◽  
Surfactant Production ◽  
Optimum Reaction ◽  
Main Components

Glucose dehydroabietate was synthesized from glucose and dehydroabietic acid in the presence of propanediol and base catalyst. The product exhibits good surface activity. Rosin is one kind of widely applied raw materials. The main components of rosin, resinolic acids, have hydrophobic phenanthrene structure. The acid group of resinolic acids can react with hydrophilic compounds to form a series of surfactants. Therefore, rosin can be used for surfactant production. Glucose is the most widely distributed and important monosaccharide. All plants can produce glucose via. photosynthesis. While glucose reacts with rosin, the product, glucose rosinate, exhibits excellent surface activity. Besides, just like sugar esters [1], the surfactant has the characteristic of non-toxic, easily degradable and harmless for environment. It can be applied widely in food and other industry. In the present paper, glucose dehydroabietate has been synthesized from dehydroabietic acid and glucose with propanediol as solvent. The optimum reaction conditions have been investigated.

Statistical Optimization of Synthesis of β-Methylhydrogen Itaconate

2013 ◽  
Vol 312 ◽  
pp. 341-344
Author(s):  
Jing Zhao
Keyword(s):  
Response Surface Methodology ◽  
Statistical Analysis ◽  
Benzoyl Chloride ◽  
Maximum Yield ◽  
Molar Ratio ◽  
Temperature Reaction ◽  
Reaction Conditions ◽  
Optimum Reaction ◽  
Substrate Molar Ratio ◽  
Central Composite

β-Methylhydrogen itaconate was synthesized with itaconic acid and methyl alcohol and using benzoyl chloride as catalyst. The important variables (reaction temperature, reaction time and substrate mole ratio) were optimized by Box-Behnken central composite design under response surface methodology. The statistical analysis showed that the optimum reaction conditions (temperature 58.98 °C, time 0.5 h and substrate molar ratio 3.71) led to a maximum yield (99.2%).

scholarly journals Further characterization of collagen galactosyltransferase from chick embryos

1978 ◽  
Vol 169 (1) ◽  
pp. 189-196 ◽  
Author(s):  
L Risteli
Keyword(s):  
Concanavalin A ◽  
Chick Embryos ◽  
Reaction Conditions ◽  
Enzyme Preparations ◽  
Basement Membrane Collagen ◽  
Optimum Reaction ◽  
High Concentrations ◽  
Optimum Extraction ◽  
Membrane Collagen

Optimum extraction of collagen galactosyltransferase activity from chick embryos required relatively high concentrations of detergent and salt. The activity was inhibited by concanavalin A, and the enzyme had a high affinity for columns of this lectin coupled to agarose; these results suggest the presence of carbohydrate units in the enzyme molecule. Collagen galactosyltransferase was highly labile, and only 1% of the originally bound enzyme activity could be eluted from the concanavalin A-agarose column with a buffer containing methyl glucoside and ethylene glycol. The purification of the activity over the original supernatant of chick embryo homogenate was 250-300-fold, with the optimum reaction conditions for the purified transferase differing somewhat from those for crude enzyme preparations. The reaction was inhibited by glucose-free basement-membrane collagen, UDP and galactosylhydroxylsine, and also by Co2+ and a number of compounds resembling UDP-galactose. Hydroxylysine was also a weak inhibitor. Immobilized hydroxylysine and UDP-glucuronic acid did not bind the collagen galactosyltransferase, but the enzyme was retarded in a column of UDP-galacturonic acid linked to agarose.

scholarly journals Synthesis and Structural Characterization of (E)-4-[(2-Hydroxy-3-methoxybenzylidene)amino]butanoic Acid and Its Novel Cu(II) Complex

Molbank ◽  
10.3390/m1179 ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. M1179
Author(s):  
Eleftherios Halevas ◽  
Antonios Hatzidimitriou ◽  
Barbara Mavroidi ◽  
Marina Sagnou ◽  
Maria Pelecanou ◽  
...  
Keyword(s):  
Schiff Base ◽  
Gamma Aminobutyric Acid ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Polymeric Compound ◽  
Bridging Ligands ◽  
1H And 13C Nmr ◽  
One Dimensional ◽  
Ft Ir

A novel Cu(II) complex based on the Schiff base obtained by the condensation of ortho-vanillin with gamma-aminobutyric acid was synthesized. The compounds are physico-chemically characterized by elemental analysis, HR-ESI-MS, FT-IR, and UV-Vis. The complex and the Schiff base ligand are further structurally identified by single crystal X-ray diffraction and 1H and 13C-NMR, respectively. The results suggest that the Schiff base are synthesized in excellent yield under mild reaction conditions in the presence of glacial acetic acid and the crystal structure of its Cu(II) complex reflects an one-dimensional polymeric compound. The molecular structure of the complex consists of a Cu(II) ion bound to two singly deprotonated Schiff base bridging ligands that form a CuN2O4 chelation environment, and a coordination sphere with a disordered octahedral geometry.

Visible-light-responsive lanthanide coordination polymers for highly efficient photocatalytic aerobic oxidation of amines and thiols

2021 ◽  
Author(s):  
Zhifen Guo ◽  
Xin Liu ◽  
Yan Che ◽  
Hongzhu Xing ◽  
Peng Chen
Keyword(s):  
Visible Light ◽  
Molecular Oxygen ◽  
Coordination Polymers ◽  
Aerobic Oxidation ◽  
Synthesis And Characterization ◽  
Lanthanide Coordination Polymers ◽  
Highly Efficient ◽  
Photocatalytic Reactions ◽  
Energy Issues

Development of visible-light-induced photocatalytic reactions using molecular oxygen as terminal oxidant is intriguing in view of the current environmental and energy issues. We report herein the synthesis and characterization of...

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