Reakcije katalitske pretvorbe ogljikovega dioksida/vodika v alkohole

Žagar, Leon (author), Grošelj, Uroš (mentor), Likozar, Blaž (co-mentor)

Ogljikov dioksid je neizkoriščen vir ogljika in je pogosto stranski produkt pri uporabi fosilnih goriv in drugih industrijskih procesih. Ogljikov dioksid je termodinamsko stabilna in inertna molekula, ki se pogostokrat izpusti v ozračje, hkrati je toplogredni plin in pušča negativne posledice na okolju. Uporaba katalizatorjev bi pripomogla k pretvorbi ogljikovega dioksida v produkte z dodano vrednostjo, s katerimi bi lahko zmanjšali potrebo po fosilnih gorivih. Z uporabo vzporednih pretočnih reaktorjev, ustreznega katalizatorja ter mešanice plina ogljikovega dioksida in vodika sem uspešno pretvoril ogljikov dioksid v alkohole in druge produkte z višjo dodano vrednostjo. Sintetiziral sem razne katalizatorje, ki so temeljili na bakrovem oksidu, cinkovem oksidu in železovem oksidu. Glavni cilj je bila sinteza katalizatorja, ki bi imel čim večjo konverzijo ogljikovega dioksida v etanol. Produkte reakcije sem analiziral s plinsko kromatografijo. Preizkusil sem katalizatorje, osnovane na zeolitni podpori, in katalizatorje kovinskih oksidov, ki so bili dopirani z različnimi masnimi deleži cezija in rubidija. S tem sem izboljšal selektivnost pretvorbe ogljikovega dioksida v etanol. Katalizatorje, ki so bili uspešni v pretvorbi ogljikovega dioksida, sem med seboj primerjal ter jih karakteriziral z metodami SEM, EDS, XRD, BET in ICP-OES.

• Language: Slovenian
• Keywords: kataliza, ogljikov dioksid, sinteza alkoholov, pretočni reaktor
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2023
• PID: 20.500.12556/RUL-152150
• COBISS.SI-ID: 176606979
• Publication date in RUL: 07.11.2023

Secondary language

• Language: English
• Title: Catalytic conversion reactions of carbon dioxide/hydrogen into alcohols

Abstract

Carbon dioxide is an unused carbon source, often a side product of fossil fuel use and other industrial processes. Carbon dioxide is thermodynamically stable and inert molecule, often released into the atmosphere and a greenhouse gas which negatively impacts on the environment. The use of catalysts would help the conversion of carbon dioxide into high value chemicals to help reduce the need of fossil fuel use. With the help of parallel reactors, catalyst and a mixture of carbon dioxide and hydrogen I successfully obtained alcohols and other high value chemicals. I synthesized the catalysts based on copper oxide, zinc oxide and iron oxides. The main goal was to synthesize a catalyst with the highest conversion of carbon dioxide into ethanol. The products were analyzed with gas chromatography. I tested the catalysts based on zeolite support and metal oxides, doped with various weight percentages of caesium or rubidium to increase the selectivity of carbon dioxide conversion into ethanol. I also characterized successful catalysts using SEM, EDS, XRD, BET and ICP–OES methods.

• Keywords: catalysis, carbon dioxide, alcohol synthesis, flow reactor