Mechanochemistry synthesis of hydrotalcites for the conversion of vanillin, a lignin derivative.

ANGIE NARANJO; JOSÉ MARTÍNEZ; ELIANA NOPE; HUGO ROJAS; MARÍA BRIJALDO; GUSTAVO ROMANELLI; RAFAEL LUQUE

Congreso; Pan American Ceramics Congress and Ferroelectrics Meeting of Americas (PACC-FMAs 2024); 2024

Lamellar double hydroxides (LDH), or hydrotalcites are versatile and economical materials, their structure is brucite-type where the Mg2+ cation coordinates with OH forming octahedrons. Hydrotalcite can be synthesized by various methods, the most used being the coprecipitation, but thismethodology requires prolonged synthesis times >18 h [1]. Therefore, synthesis with shorter times for the preparation of these materials has been explored.The laminar structure formation is confirmed by all materials, as evidenced by characteristic diffraction peaks indicative of the hydrotalcite structure. In the case of LDH-MgNi, reflections from (003) and (006) planes indicate the accurate isomorphic substitution of Mg2+ for Ni2+ in the brucite layer [3].Microwave radiation causes polar molecules within the material to rotate and generate heat through friction. The heating is more uniform and typically faster compared to conventional heating. The inclusion of nickel into the LDH structure results in a decrease in the reaction rate during the initial 0-60 minutes of the reaction. This decrease could potentially be attributed to the metal's ability to obstruct certain active sites within the material. Additionally, nickel altering its acid-base properties