Open AccessAluminum-Alginate (Al-Alg) as Green Catalyst in Solketal Synthesis from Acetone and Glycerol
Author(s) -
Mahreni
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/742/1/012011
Subject(s) - catalysis , acetone , chemistry , glycerol , fourier transform infrared spectroscopy , precipitation , nuclear chemistry , solvent , organic chemistry , chemical engineering , physics , meteorology , engineering
A catalyst is a chemical that can accelerate a reaction. So far, the catalyst uses precious metals (Pt, Au, Ag) which are heavy and expensive metals. In this research, a biodegradable Aluminum-Alginate (Al-Alg) green catalyst was synthesized using the precipitation method at room temperature. Aluminum is derived from Al (NO 3 ) 3 solution, and the Alginate used is brown algae extract in the form of Sodium-Alginate (Na-Alg). Previous research has reported that Aluminum-Alginate (Al-Alg) has been shown to accelerate the esterification reaction. In this research, Al-Alg was tried as a catalyst in the reaction of Solketal formation from Acetone and Glycerol. The purpose of this research is to prove the Al-Alg catalyst that has been synthesized using the precipitation method which can be used as a catalyst in the reaction of Solketal formation from Acetone and Glycerol. The research was carried out in two stages, namely the extraction of Alginate from brown algae using 2% by weight natrium-alginate solvent, then the second stage was the deposition of Na-Alginate using Al (NO 3 ) 3 solution. The precipitation was carried out at room temperature. The precipitate was dried, then its physical characteristicwas tested using FTIR and TGA/DTA; the chemical characteristic of the catalyst was tested through catalyzed reaction. The FTIR test results showed that the alginate molecule had been bound to Al molecule which was marked by a peak at the wave number of 1383.4 cm −1 which indicated the carboxylic group of COOH owned by Alginate, namely the symmetric stretching vibration of the carboxylate group. In addition, the peak at the wave number of 827 cm −1 showed that the C1 – H deformation vibration of b- mannuronic acid residues from Alginate. The peak at the wave number of 550 cm −1 proved that Aluminum (Al) had been bound to Alginate, and forming Al-Alg. The catalyst activity test was carried out by applying the Al-Alg catalyst in the catalyzing reaction of the formation of Solketal from Acetone and Glycerol. The reaction results were analyzed using GC-MS and it showed that the solketal was formed, and the selectivity was quite high at 96 %, proving that Al-Alg had the potential as a catalyst in catalyzing reaction.