Modification of Silica with Sucrose and Ammonium Fluoride Agents: A Facile Route to Prepare Supports of Iridium Catalysts for Hydrogenation Reaction
Ewa Janiszewska, Mariusz Pietrowski, Michał Zieliński
TL;DR
Researchers developed a new method to create porous silica supports using sucrose and ammonium fluoride, which improves the performance of iridium catalysts in hydrogenation reactions.
Contribution
A novel, eco-friendly approach using sucrose and ammonium fluoride to synthesize structured silica supports for iridium catalysts is introduced.
Findings
Sucrose and its transformation products significantly influence the structure of mesoporous silica.
Modification with ammonium fluoride generates acidity, enhancing catalyst performance in hydrogenation.
Catalysts with improved porous structure and acidity showed higher activity in hydrogenation reactions.
Abstract
Mesoporous silica materials were synthesized using inexpensive and environmentally friendly sucrose as a porogeneous agent. It was found that the presence of sucrose and the products of its chemical transformation during synthesis (e.g., furfural polymer) significantly affected the structure of the obtained porous silica. The influence of synthesis conditions (pH, temperature, time) on the textural properties of the final materials was determined. Samples obtained in an acidic medium, at pH = 1, and treated at room temperature, yielded products with a large surface area and a narrow pore size distribution in the range of 2–5 nm, while the synthesis at pH = 8 allowed for the formation of mesoporous systems with pores in the range of 14–20 nm. To generate acidity, the silicas were modified with an ammonium fluoride solution and then used as supports for iridium catalysts in a…
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Taxonomy
TopicsAmmonia Synthesis and Nitrogen Reduction · Mesoporous Materials and Catalysis · Chemical Synthesis and Characterization