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Dehydration of isopropyl alcohol with activated carbon functionalized with Br- and S-containing reagents
- Source :
- Voprosy Khimii i Khimicheskoi Tekhnologii. :90-99
- Publication Year :
- 2021
- Publisher :
- SHEI Ukrainian State University of Chemical Technology, 2021.
-
Abstract
- Bromination of activated carbon GSGD was performed and active bromine-containing precursors were obtained, in which bromine is capable of being replaced by sulfur-containing functional groups. Bromination with liquid bromine and a solution of bromine in potassium bromide at room temperature leads to the introduction of 0.44ā0.45 mmol gā1 of bromine into the surface layer of activated carbon. The treatment of brominated samples with sulfur-containing reagents with subsequent oxidation allows obtaining carbon samples that are catalytically active in the dehydration reaction of isopropyl alcohol in a gas phase. The temperature of complete conversion of isopropyl alcohol to propylene is a measure of catalytic activity. The concentration of sulfogroups in the prepared samples is up to 0.3 mol gā1. Thermogravimetry and thermoprogrammed desorption with mass spectrometric registration of products were used to study the thermal stability of modified activated carbon samples. The influence of the nature of brominating reagents, hydrolysis conditions and oxidation conditions on the structure, surface concentration of grafted S-containing groups and catalytic properties of the obtained materials was studied. Pre-bromination leads to an increase in the catalytic activity of activated carbon modified with sulfur-containing groups and the temperature of complete conversion of isopropyl alcohol to propylene decreases up to 400C depending on the concentration of sulfogroups.
- Subjects :
- Chemistry
General Chemical Engineering
Isopropyl alcohol
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
medicine.disease
01 natural sciences
0104 chemical sciences
chemistry.chemical_compound
Reagent
Materials Chemistry
medicine
Environmental Chemistry
Organic chemistry
Dehydration
0210 nano-technology
Activated carbon
medicine.drug
Subjects
Details
- ISSN :
- 24137987 and 03214095
- Database :
- OpenAIRE
- Journal :
- Voprosy Khimii i Khimicheskoi Tekhnologii
- Accession number :
- edsair.doi...........71797f6860670779da64bbe4823264c8
- Full Text :
- https://doi.org/10.32434/0321-4095-2021-136-3-90-99