diplomsko delo
Katja Drobež (Author), Marjan Marinšek (Mentor)

Abstract

Zaradi sodobnega načina življenja se zelo hitro povečuje koncentracija ogljikovega dioksida v ozračju. Strokovnjaki iščejo rešitve za zmanjšanje njegove koncentracije. Ena izmed rešitev je njegova pretvorba v metanol. Pri tem se v industriji uporabljajo katalizatorji, ki pospešijo določene kemijske reakcije za pretvorbo reaktanta v željeni produkt. Pri razvoju katalizatorjev se izvajajo različna testiranja, da najdemo najbolj aktivnega, specifičnega in stabilnega za določeno reakcijo. Nekateri izmed katalizatorjev, kateri se uporabljajo pri sintezi metanola so Cu/ZnO/Al2O3, Cu/SrTiO3 in Pd/In2O3, ki so jih testirali na Kemijskem inštitutu v Ljubljani. Podatke testiranj sem analizirala in iz njih pridobila, kako na selektivnost, aktivnost in aktivacijsko energijo vpliva različen nanos nanodelcev bakra na katalizatorju SrTiO3. Te katalizatorje sem primerjala tudi s Pd/In2O3 in Cu/ZnO/Al2O3. Ugotovitve so pokazale, da se aktivnosti katalizatorjev z različnim nanosom bakra na SrTiO3 v odvisnosti od časa v večini primerov ne spreminjajo, selektivnosti pa naraščajo. Navidezni aktivacijski energiji tvorbe metanola pri katalizatorjema z 0,5 in 5 % nanosom bakra na SrTiO3 sta med seboj precej podobni, skoraj enaki. Pri primerjanju različnih tipov katalizatorjev rezultati kažejo, da ima najvišjo navidezno aktivacijsko energijo nastanka metanola Pd/In2O3, najnižjo pa Cu/ZnO/Al2O3.

Keywords

ogljikov dioksid;hidrogenacija ogljikovega dioksida;metanol;katalizatorji;kataliza;testiranje katalizatorjev;diplomska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [K. Drobež]
UDC: 66.094.25.097.3(043.2)
COBISS: 28563715 Link will open in a new window
Views: 502
Downloads: 87
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Other data

Secondary language: English
Secondary title: Testing of modern catalysts for the synthesis of methanol
Secondary abstract: Due to the modern way of life, the concentration of carbon dioxide in the atmosphere is increasing very quickly. Experts are looking for solutions to reduce its concentration. One of the solutions is its conversion to methanol. In doing so, catalysts are used in industry to accelerate certain chemical reactions to convert the reactant to the desired product. In the development of catalysts, various tests are performed to find the most active, specific and stable one for a particular reaction. Some of the catalysts used in the synthesis of methanol are Cu/ZnO/Al2O3, Cu/SrTiO3 and Pd/In2O3 and they were tested at the Institute of Chemistry in Ljubljana. I analyzed the test data and found out how the selectivity, activity and activation energy are affected by different deposition of copper nanoparticles on the SrTiO3 catalyst. I also compared these catalysts with Pd/In2O3 and Cu/ZnO/Al2O3. The findings showed that the activities of catalysts with different copper deposition on SrTiO3 do not change in most cases depending on time, and the selectivities increase. The apparent activation energies of methanol formation in catalysts with 0.5 and 5 % copper deposition on SrTiO3 are quite similar, almost identical. When comparing different types of catalysts, the results show that Pd/In2O3 has the highest apparent activation energy of methanol formation and Cu/ZnO/Al2O3 the lowest one.
Secondary keywords: methanol;carbon dioxide hydrogenation;catalysts;catalysis;catalyst testing;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000372
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages: 33 str.
ID: 12031193