Synthesis of Hydrotalcites Using Microwave Irradiation

1996 ◽  
Vol 454 ◽  
Author(s):  
G. Fetter ◽  
P. Bosch ◽  
F. A. Hernandez
Keyword(s):  
Microwave Irradiation ◽  
Exchange Capacity ◽  
Microwave Oven ◽  
Anion Exchangers ◽  
Domestic Microwave Oven

ABSTRACTHydrotalcites are mineral anion exchangers whose exchange capacity is determined by the amount of structural magnesium atoms (octahedrally coordinated) substituted by aluminium atoms. In this work we study the synthesis of hydrotalcites using a domestic microwave oven at room pressure. The effect of the oven power on the composition and on the resulting structure of two hydrotalcites differing on their nominal Al/Al+Mg ratio is presented.

scholarly journals A Green Synthesis of a Novel Calix[4]Resorcinarene from 7-Hydroxycitronellal Using Microwave Irradiation

2018 ◽  
Vol 18 (1) ◽  
pp. 53
Author(s):  
Ratnaningsih Eko Sardjono ◽  
Iqbal Musthapa ◽  
Iis Rosliana ◽  
Fitri Khoerunnisa ◽  
Galuh Yuliani
Keyword(s):  
Energy Consumption ◽  
Reaction Time ◽  
Microwave Irradiation ◽  
Irradiation Time ◽  
Microwave Oven ◽  
Conventional Heating ◽  
Heating Method ◽  
Microwave Assisted ◽  
Domestic Microwave Oven ◽  
Waste Production

A new versatile macromolecule cyclic C-3,7-dimethyl-7-hydroxycalix[4]resorcinarene (CDHHK4R) has been synthesized from a fragrance agent, 7-hydroxycitronellal, via microwave irradiation. The reaction utilized a domestic microwave oven at various irradiation time and power to yield an optimum condition. As a comparison, the conventional heating method was also employed for the synthesis of the same calix[4]resorcinarene. Compared to the conventional method, microwave-assisted reaction effectively reduced the reaction time, the amount of energy consumption and the waste production. It is found that the synthesis of CDHHK4R by microwave irradiation yielded 77.55% of product, higher than by conventional heating which was only 62.17%.

scholarly journals Release of Fumigant Residues from Grain by Microwave Irradiation

1998 ◽  
Vol 81 (3) ◽  
pp. 673-678
Author(s):  
Yong-Lin Ren ◽  
James M Desmarchelier
Keyword(s):  
Solvent Extraction ◽  
Microwave Irradiation ◽  
Microwave Oven ◽  
Microwave Method ◽  
Multiresidue Analysis ◽  
Domestic Microwave Oven ◽  
Irradiation Power ◽  
Power Setting ◽  
Initial Procedure ◽  
Gas Tight

abstract Multiresidue analysis of fumigants is important because of their widespread use on staple foodstuffs, such as grain. Fumigants are usually extracted from grain either by solvent extraction or by purgeand- trap techniques. In this paper, fumigant residues in wheat were "extracted" by a microwave procedure. Wheat, in gas-tight Erlenmeyer flasks, was placed in a domestic microwave oven, and fumigants were released into the headspace by microwave irradiation. Power settings for maximum release of fumigants were determined for CH3Br PH3, CS2, and COS. Recoveries of fortified samples were >90%. Completeness of extraction was assessed from the amount of fumigant retained by the microwave-irradiated wheat. This amount, determined from both solvent extraction and from further microwave irradiation, was always small(<5℅ of the amount obtained from the initial procedure). Limits of quantitation were <1 ng/g for ChhBr, PH3, and CS2. These low limits were essentially due to the absence of interference from solvents. The microwave method is rapid and solvent-free. However, care is required in selecting the appropriate power setting. The safety implications of heating sealed flasks in microwave ovens should be noted.

scholarly journals ONE-STEP CONVERSION OF EUGENOL TO METHYL ISOEUGENOL USING MICROWAVE IRRADIATION IN SOLVENT-FREE CONDITIONS

2010 ◽  
Vol 6 (3) ◽  
pp. 292-296 ◽  
Author(s):  
Marcellino Rudyanto ◽  
Lanny Hartanti
Keyword(s):  
Microwave Irradiation ◽  
Potassium Hydroxide ◽  
Phase Transfer ◽  
Tetrabutylammonium Bromide ◽  
Dimethyl Sulfate ◽  
Microwave Oven ◽  
Methyl Eugenol ◽  
Domestic Microwave Oven ◽  
Solvent Free Conditions ◽  
One Step

A research on conversion of eugenol to methyl isoeugenol via one-step reaction with microwave irradiation has been carried out. Mixtures containing eugenol, sodium or potassium carbonate as solid support, with or without sodium or potassium hydroxide as base, with or without tetrabutylammonium bromide as phase transfer catalyst, with dimethyl sulfate as the methylating agent were irradiated in a domestic microwave oven for 20 - 50 seconds. It was revealed that one-step methylation and isomerization required combinations of sodium or potassium hydroxide base and tetrabutylammonium bromide. Without combination of base and TBAB only one product, i.e. methyl eugenol, was formed.   Keywords: eugenol, methyl eugenol, methyl isoeugenol, microwave

scholarly journals Towards High Efficacy of Pd-Au/C Catalyst for Tetrachloromethane Hydrodechlorination

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 338-359
Author(s):  
Magdalena Bonarowska ◽  
Zbigniew Kaszkur ◽  
Krzysztof Matus ◽  
Alicja Drelinkiewicz ◽  
Tomasz Szumełda ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Gas Phase ◽  
Thermal Activation ◽  
Supported Catalysts ◽  
Carbon Support ◽  
Thermal Reduction ◽  
Microwave Oven ◽  
Optimal Conditions ◽  
Catalyst Activation ◽  
Critical Part

We present an efficient strategy for synthesising the PdAu catalysts with a homogeneous PdAu alloy phase for environmentally important hydrodechlorination of tetrachloromethane in the gas phase. The synthesis of carbon-supported catalysts involved two major steps: (i) incorporation of palladium and gold nanoparticles into carbon support and (ii) activation of the catalysts. The critical part of this work was to find the optimal conditions for both steps. Thus, the incorporation of the nanoparticles was carried out in two ways, by impregnation and direct redox reaction method using acetone solutions of metal precursor salts. The activation was performed either by a conventional thermal reduction in hydrogen or flash irradiation in a microwave oven. The homogeneity and structure of the PdAu alloy were found to depend on the catalyst activation method critically. In all cases, we observed better homogeneity for catalysts that were subject to microwave irradiation. Moreover, the flash microwave irradiation of prepared catalysts provided catalysts of better stability and selectivity towards the desired products (hydrocarbons) in the hydrodechlorination of tetrachloromethane as compared to the catalyst obtained by conventional thermal activation in hydrogen.

scholarly journals Thermal treatment of superconductor thin film of the BSCCO system using domestic microwave oven

2012 ◽  
Vol 478 ◽  
pp. 56-59 ◽  
Author(s):  
J.B. Silveira ◽  
C.L. Carvalho ◽  
G.B. Torsoni ◽  
H.A. Aquino ◽  
R. Zadorosny
Keyword(s):  
Thin Film ◽  
Thermal Treatment ◽  
Microwave Oven ◽  
Bscco System ◽  
Domestic Microwave Oven

Endo-β-N-acetylglucosaminidase H de-N-glycosylation in a domestic microwave oven: Application to biomarker discovery

2013 ◽  
Vol 433 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Elena Frisch ◽  
Christian Schwedler ◽  
Matthias Kaup ◽  
Elena Iona Braicu ◽  
Jörn Gröne ◽  
...  
Keyword(s):  
Biomarker Discovery ◽  
Microwave Oven ◽  
Domestic Microwave Oven

Wet digestion of vegetable tissue using a domestic microwave oven

1993 ◽  
Vol 279 (2) ◽  
pp. 273-279 ◽  
Author(s):  
Miguel-Angel Mateo ◽  
Santiago Sabaté
Keyword(s):  
Microwave Oven ◽  
Wet Digestion ◽  
Domestic Microwave Oven

In2O3 microcrystals obtained from rapid calcination in domestic microwave oven

2010 ◽  
Vol 45 (11) ◽  
pp. 1703-1706 ◽  
Author(s):  
F.V. Motta ◽  
R.C. Lima ◽  
A.P.A. Marques ◽  
E.R. Leite ◽  
J.A. Varela ◽  
...  
Keyword(s):  
Microwave Oven ◽  
Domestic Microwave Oven
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