Influence of basic properties of Mg,Al-mixed oxides on their catalytic activity in knoevenagel condensation between benzaldehyde and phenylsulfonylacetonitrile

Química Nova

Monteiro, José Luiz Fontes¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹  López Nieto, Jose Manoel¹  Henriques, Cristiane Assumpção¹  Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil¹  Universidade Estadual de Goiás, Anápolis, Brasil¹  Universidad Politécnica de Valencia, Valencia, Espanha¹  Pérez, Caridad Noda¹ 

关键词: Knoevenagel condensation;    Mg;    Al-mixed oxides;    α-phenylsulfonylcinnamonitrile.;   

DOI  :  10.1590/S0100-40422009000900020

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The catalytic performance of Mg,Al-mixed oxides (MO20, MO25 and MO33) derived from hydrotalcites was evaluated in the Knoevenagel reaction between benzaldehyde and phenylsulfonylacetonitrile at 373 and 383 K. The best results were obtained for the sample MO20 that presented the highest basic sites density and external area and the smallest crystallite sizes. The relative amount of basic sites with weak to intermediate strength also played an important role on catalytic performance. By increasing the catalyst content from 1 to 5 wt.% at 383 K, a complete conversion of the reactants is attained, producing α-phenylsulfonylcinnamonitrile with a selectivity of 100%.

【 授权许可】

Unknown