The proposed research project aims to use mixed metal oxides (MMO) derived from layered double hydroxides (LDHs) like-hydrotalcite containing Cu2+ as solid catalysts in ethanol reforming at high CO2 pressure to produce two classes of compounds, namely: 1. Guerbet compounds and 2. acyclic organic carbonates. The general formula of the Cu-Hydrotalcite used as a reference, is (Cu0.1Mg0.9)6Al2(CO3)(OH)16*4(H2O) and can be easily synthesized by coprecipitation of saline solutions with hydrotalcite constituent metals in alkaline medium containing CO32-. The Cu-MMO obtained by calcination at 450 °C has active surface for reforming of alcohols. This study will investigate the catalytic activity and selectivity of Cu-MMO modified by the inclusion of 1% (m/m) de Ag+, Ni2+, Fe3+, La3+ or Nb5+ separately, for ethanol reforming process (hydrous and anhydrous) under high CO2 pressure (5 MPa) between 160 to 320 ºC. As a consequence of ethanol dehydrogenation, a variety of value-added compounds is formed by a process known as Guerbet Reaction, whose products can be alcohols, ester, ethers or ketones. Under high CO2 pressures Guerbet compounds can react each other to form acyclic organic carbonates saturated and unsaturated with wide application in cosmetics, polymers, pesticides or medicines, and also contribute to CO2 fixation. The carboxylation can be carried out in one-pot with the Guerbet reaction or higher alcohols can be isolated and reacted in a second time.
News published in Agência FAPESP Newsletter about the scholarship: