Izvestiya of Saratov University.
Chemistry. Biology. Ecology
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)

удельная поверхность

Thermal transformation of drilling sludge: Structural and surface changes

The study investigates the structural and surface changes occurring in carbonate drilling sludge (CDS) of oil-based origin under high-temperature pyrolysis. The main focus is placed on the transformation of the organo-mineral system using IR spectroscopy, as well as on the changes in textural characteristics analyzed by adsorption–pore methods (BET and BJH). It has been established that pyrolysis ensures the complete removal of the organic fraction of the sludge, which is confi rmed by the disappearance of characteristic aliphatic hydrocarbon bands in the IR-spectra.

ТЕРМИЧЕСКАЯ ТРАНСФОРМАЦИЯ БУРОВОГО ШЛАМА: СТРУКТУРНЫЕ И ПОВЕРХНОСТНЫЕ ИЗМЕНЕНИЯ

В работе исследованы структурные и поверхностные изменения, происходящие в карбонатном буровом шламе (КБШ) на нефтяной основе при высокотемпературном пиролизе. Основное внимание уделено изучению трансформации органо-минеральной системы методом ИК-спектроскопии, а также изменению текстурных характеристик с применением адсорбционно-порового анализа (BET и BJH). Установлено, что пиролиз обеспечивает полное удаление органической составляющей шлама, что подтверждается исчезновением характерных полос алифатических углеводородов в ИК-спектрах.

The study of the physic-chemical properties of bentonite-based composite sorbents modified with carbon under the conditions of catalytic carbonization

The structural and sorption properties of composite sorbents based on natural bentonite modified with carbon compounds have been investigated. Modification of the initial bentonite by low-temperature (650°C) pyrolysis of sucrose in the presence of metal salts of the iron subgroup leads to a significant increase in the specific surface area of composite sorbents (up to 275 m2/g), this is due to low-temperature catalytic graphitization of the carbon fraction formed during pyrolysis.

Sorbents Based on Natural Bentonites Modified with Iron (III) and Aluminum Polyhydroxocations by the Sol-Gel Method

Natural bentonite was modified with iron (III) and aluminum polyhy- droxocations by the sol–gel technique. This modification of natural bentonite has been found to cause changes in its chemical composi- tion, structural and sorption properties. The modified sorbents are fine-porous (nanostructured) objects with the predominance of 1.5–6.0 nm pore size. The specific surface area of our sorbents depends on the method of modification and the amount of the modifying component introduced (iron (III) or aluminum).

The study of the physic-chemical properties of bentonite-based composite sorbents modified with carbon under the conditions of catalytic carbonization

The structural and sorption properties of composite sorbents based on natural bentonite modified with carbon compounds have been investigated. Modification of the initial bentonite by low-temperature (650°C) pyrolysis of sucrose in the presence of metal salts of the iron subgroup leads to a significant increase in the specific surface area of composite sorbents (up to 275 m2/g), this is due to low-temperature catalytic graphitization of the carbon fraction formed during pyrolysis.