| Autor: |
Sam, Nur Fatin Izzati Che, Elzaneen, Kholoud M. H., Harun, Farah Wahida, Hussin, Hayati, Azman, Hazeeq Hazwan, Zahari, S. M. Shahrul Nizan Shikh |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2023, Vol. 2625 Issue 1, p1-8, 8p |
| Abstrakt: |
Montmorillonite is a type of clay. However, pristine montmorillonite generates low conversion of lactic acid due to limitation of acid sites in the clay structure. The acid-treated montmorillonite clay catalyst has been selected because studies utilising the clay as a catalyst in this particular reaction are still limited. In this preliminary work, montmorillonite (MMT) was treated with H2SO4 with the goal of increasing the acidity of the clay for enhancing the catalytic conversion of D-glucose to lactic acid (LA). Treating MMT with 0.3 M of H2SO4 replaced some quantities of inherent exchangeable cations (Ca2+, Mg2+ and K+) with the acidic H+ by ion exchange reaction. As a result, the Brønsted acid sites of the clay were increased. Unfortunately, the H2SO4−treatment also caused minor damage to the inherent layered structure of MMT, as reflected by the leaching of Al3+ or/and Si2+. Interestingly, this occurrence is indeed advantageous because the leaching process appeared to generate more acidic sites, in particular the Lewis acid. The contribution of H2SO4 in enhancing the acidity of MMT was further exemplified by the catalytic study. The reaction, conducted in a hydrothermal reactor at 170 °C, showed that the H2SO4−treated-MMT (S-MMT) produced much higher LA than pristine-MMT (P-MMT), irrespective of reaction period. This study offers potential for the usage of S-MMT catalyst in glucose conversion to organic acids as well as other organic reactions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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