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## Study of acidic properties of alumina-molybdena catalysts impregnated with sulfuric acid

### Szymon Latuszek

#### Abstract

Nowadays, chemical industry is based on heterogeneous catalysis. Heterogeneous catalysis is a kind of catalysis in which substrate is in a different phase than a catalyst. A catalyst is a substance, which increase the rate of a reaction and permit to lead the reaction in lower temperatures and pressures. Active sites are species present on the surface of catalyst which are responsible for decreasing activation energy required for the reaction to proceed. One can categorize active sites into acid-base and oxidation-reducing categories. The Al2O3/MoO3 catalyst is an example of a heterogeneous catalyst which due to presence of oxidation-reducing centers has a broad scope of applications, for example in selective oxidation processes. The aim of this thesis was to investigate the influence of sulfuric acid on acidic properties of Al2O3/MoO3 catalyst. To confirm that impregnation of Al2O3/MoO3 catalyst with sulfuric acid cause creating the new catalytic properties, test reactions were conducted with the presence of: Al2O3/MoO3/2%H2SO4, Al2O3/MoO3/4%H2SO4, Al2O3/MoO3/6%H2SO4 catalysts. The method of the test reactions allows to determine the acidic strength of catalysts. The base of this method is to carry out a series of reactions with substrates which acid strength (Ho min) needed for initiation of the transformation is known. If the test reaction has been initiated, it means that the acid strength of the catalyst is less or equal to the known minimum acid strength (Ho min, expressed in the Hammett function) required to begin the reaction. The reactions of: α-methylstyrene, styrene, 2,4-diphenyl-4-methyl-1-pentene, 4-phenyl-1-butene and cis-stilbene were used to determine acid strength. The test reaction method is also used to characterize the nature of active sites. For this purpose, the reactions of diacetone alcohol were performed in the presence of alumina-molybdena catalysts in which the increasing concentration of sulfuric acid. Based on the results of the test reactions, it was found that all impregnated catalysts had a minimum acidic strength ≤ -9 (Ho min). In addition, the reactions of diacetone alcohol confirmed that the impregnation with sulfuric acid causes the formation of new acidic sites and their concentration increased with the concentration of sulfuric acid.
Diploma type
Engineer's / Bachelor of Science
Diploma type
Engineer's thesis
Author
Szymon Latuszek (FC) Szymon Latuszek,, Faculty of Chemistry (FC)
Title in Polish
Badanie właściwości kwasowych katalizatorów glinowo-molibdenowych poddanych działaniu kwasu siarkowego
Supervisor
Marek Marczewski (FC/CChT) Marek Marczewski,, Chair of Chemical Technology (FC/CChT)Faculty of Chemistry (FC)
Certifying unit
Faculty of Chemistry (FC)
Affiliation unit
Chair of Chemical Technology (FC/CChT)
Study subject / specialization
, Technologia Chemiczna
Language
(pl) Polish
Status
Finished
Defense Date
01-02-2019
Issue date (year)
2019
Reviewers
Marek Marczewski (FC/CChT) Marek Marczewski,, Chair of Chemical Technology (FC/CChT)Faculty of Chemistry (FC) Gabriel Rokicki (FC/CPCT) Gabriel Rokicki,, Chair Of Polymer Chemistry And Technology (FC/CPCT)Faculty of Chemistry (FC)
Keywords in Polish
kwasowość, funkcja kwasowości Hammetta, kataliza heterogeniczna, reakcje testowe, moc kwasowa, katalizator, kwas siarkowy, tlenek glinu, tlenek molibdenu
Keywords in English
acidity, Hammett acidity function, heterogeneous catalysis, test reactions, acid strength, sulfuric acid, aluminium oxide, molybdenum oxide
Abstract in Polish
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Local fields
Identyfikator pracy APD: 29980

Uniform Resource Identifier
https://repo.pw.edu.pl/info/bachelor/WUTcb7ca8b7c76144468660b7d092b96bf8/
URN
urn:pw-repo:WUTcb7ca8b7c76144468660b7d092b96bf8

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