Unimolecular Reactions of 1,1,1-Trichloroethane, 1,1,1-Trichloropropane, and 3,3,3-Trifluoro-1,1,1-trichloropropane: Determination of Threshold Energies by Chemical Activation

2014 ◽  
Vol 118 (40) ◽  
pp. 9347-9356 ◽  
Author(s):  
Martha A. Turpin ◽  
Kylie C. Smith ◽  
George L. Heard ◽  
D. W. Setser ◽  
Bert E. Holmes
Keyword(s):  
Chemical Activation ◽  
Unimolecular Reactions ◽  
Threshold Energies

scholarly journals Conversion of lignocellulosic agricultural wastes into adsorbents for pharmaceutical drugs

2019 ◽  
pp. 24-31
Author(s):  
Anca Cruceanu ◽  
Monica Alexandra Vaideanu ◽  
Rodica Zavoianu ◽  
Elena Bacalum ◽  
Octavian Dumitru Pavel
Keyword(s):  
Thermal Treatment ◽  
Carbon Content ◽  
Chemical Activation ◽  
Agricultural Wastes ◽  
Pharmaceutical Drugs ◽  
Adsorption Efficiency ◽  
Boehm Titration ◽  
The One ◽  
Amoxicillin Removal

Lignocellulosic agricultural wastes e.g. corn cobs, straws and corn stalks were converted into carbonaceous adsorbents using a sequence of thermal and chemical activation processes. The derived solids obtained after each type of activation were characterized by determination of fix carbon content, iodine number, Boehm titration and DRIFT spectrometry. The results obtained at the adsorption tests were well correlated to those of the characterization, showing that the most promising adsorbents for amoxicillin removal were those submitted to a thermal treatment followed by a chemical alkaline activation, followed by washing and a secondary thermal treatment. The most promising bio-based adsorbent was the one derived from corn stalks (90.6% adsorption efficiency).

Determination of the energy distribution in unimolecular reactions under soft collision conditions

1985 ◽  
Vol 17 (6) ◽  
pp. 583-590 ◽  
Author(s):  
Juan M. Figuera ◽  
Vicente Menéndez ◽  
Juan C. Rodríguez
Keyword(s):  
Energy Distribution ◽  
Unimolecular Reactions

Determination of Arrhenius parameters for unimolecular reactions of chloroalkanes by IR laser pyrolysis

1982 ◽  
Vol 77 (9) ◽  
pp. 4494-4506 ◽  
Author(s):  
Hai‐Lung Dai ◽  
Eliot Specht ◽  
Michael R. Berman ◽  
C. Bradley Moore
Keyword(s):  
Unimolecular Reactions ◽  
Arrhenius Parameters ◽  
Laser Pyrolysis ◽  
Ir Laser

scholarly journals Determination of Energy Characteristic and Microporous Volume by Immersion Calorimetry in Carbon Monoliths

2012 ◽  
Vol 9 (2) ◽  
pp. 650-658 ◽  
Author(s):  
Juan Carlos Moreno-Piraján ◽  
Liliana Giraldo ◽  
Diana P. Vargas
Keyword(s):  
Zinc Chloride ◽  
Chemical Activation ◽  
Micropore Volume ◽  
Bet Surface Area ◽  
Immersion Enthalpy ◽  
Immersion Calorimetry ◽  
Experimental Enthalpy ◽  
Activated Carbon Monoliths ◽  
Calculated Enthalpy

Activated carbon monoliths disc and honeycomb type were prepared by chemical activation of coconut shell with zinc chloride at different concentrations, without using a binder. The structures were characterized by N2adsorption at 77 K and immersion calorimetry into benzene. The experimental results showed that the activation with zinc chloride produces a wide microporous development, with micropore volume between 0,38 and 0,79 cm3g-1, apparent BET surface area between 725 and 1523 m2g-1and immersion enthalpy between 73,5 and 164,2 Jg-1. We compared the experimental enthalpy with calculated enthalpy by equation Stoeckli-Kraehenbuehl finding a data dispersion from which can infer that the structures are not purely microporous; this fact is ratified with similar behavior that the evidence t the product EoWo.

Determination of the adsorption capacity of activated carbon made from coffee grounds by chemical activation with ZnCl and HPO

2005 ◽  
Vol 119 (1-3) ◽  
pp. 189-194 ◽  
Author(s):  
A NAMANE ◽  
A MEKARZIA ◽  
K BENRACHEDI ◽  
N BELHANECHEBENSEMRA ◽  
A HELLAL
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Chemical Activation ◽  
Coffee Grounds

scholarly journals The Use of Chalcedonite as a Biosorption Bed in the Treatment of Groundwater

2019 ◽  
Vol 9 (4) ◽  
pp. 751 ◽  
Author(s):  
Dorota Papciak ◽  
Andżelika Domoń ◽  
Alicja Puszkarewicz ◽  
Jadwiga Kaleta
Keyword(s):  
Biofilm Formation ◽  
Chemical Activation ◽  
Ammonium Nitrogen ◽  
Test Results ◽  
Two Stage ◽  
Gravitational Flow ◽  
Nitrification Process ◽  
Normative Value ◽  
Iron And Manganese

The conducted laboratory tests allowed determination of the efficiency of removing ammonium nitrogen, iron, and manganese in the biofiltration process on chalcedonite beds. The process of water purification was carried out by a single- and two-stage biofiltration method with gravitational and anti-gravitational flow. The study examined the extent to which chemical activation of the bed with potassium manganese (VII) affects the course of the nitrification process and the rate of biofilm formation. The obtained test results indicate that two-stage biofiltration, with initial chemical activation at the first stage of biofiltration, is an effective method for purifying waters with an abnormal content of ammonium nitrogen with simultaneous removal of iron and manganese. Activation of the bed had an effect on, among other things: biofilm formation time, efficiency of removing manganese (II) ions, and oxygen consumption in the biofiltration process. Due to the longer maturation time of the activated bed, the normative value of ammonium nitrogen (< 0.39 N-NH4+) was obtained on the 23rd day of the operation of the filters, and in the non-activated bed on the 14th day. The method of bed preparation did not affect the efficiency of removal of iron compounds.

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