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Effect of Modification of Amorphous Silica with Ammonium Agents on the Physicochemical Properties and Hydrogenation Activity of Ir/SiO2 Catalysts
Authors:
- Monika Kot,
- Robert Wojcieszak,
- Ewa Agnieszka Janiszewska,
- Mariusz Pietrowski,
- Michał Arkadiusz Zieliński
- Record ID
- UAMfe0089e7443644da9de49de12d82b3f5
- Author
- Journal series
- Materials, ISSN 1996-1944
- Issue year
- 2021
- Vol
- 14
- No
- 4
- Pages
- 1-17
- Article number
- 968
- Keywords in original language
- commercial silica; modified silica; iridium catalysts; hydrogenation reaction
- ASJC Classification
- Abstract in original language
- The modification of commercial silica with solutions of NH4F or NH4Cl salts, followed by thermal treatment, enabled generation of the acidic sites in SiO2 and changed its textural properties. The use of ammonium salts solution also caused the generation of additional porosity. Using NH4F solution caused significant decrease in the specific surface area and the increase in the average pore diameter. The number and strength of resulting acid sites depend on the nature of anion in the applied ammonium salt and the concentration of salt solution. It has been found that the sample treated with NH4F presented higher total acidity (TPD–NH3) and the amount as well as the strength of acid sites increased with the concentration of the used modifier. As modified amorphous SiO2 materials used as a support for iridium (1 wt %, Ir(acac)3) nanoparticles permitted to obtain highly active catalysts for toluene hydrogenation under atmospheric pressure. The highest activity (expressed as the apparent rate and TOF) was obtained for iridium catalysts supported on silica modified by NH4F with the highest acidity. The modification of silica with NH4F favors the generation of centers able to adsorb toluene, which results in higher activity of this catalyst.
- DOI
- DOI:10.3390/ma14040968 Opening in a new tab
- URL
- https://www.mdpi.com/1996-1944/14/4/968 Opening in a new tab
- Language
- (en) English
- License
- Score (nominal)
- 140
- Score source
- journalList
- Score
- = 140.0, 15-05-2022, ArticleFromJournal
- Publication indicators
- = 0; = 1; : 2017 = 1.285; : 2018 (2 years) = 2.972 - 2018 (5 years) =3.532
- Citation count
- 1
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- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/article/UAMfe0089e7443644da9de49de12d82b3f5/
- URN
urn:amu-prod:UAMfe0089e7443644da9de49de12d82b3f5
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.