Air stable ligandless heterogeneous catalyst systems based on Pd and Au supported in SiO2 and MCM-41 for Suzuki-Miyaura cross-coupling in aqueous medium

作者：Speziali Marcelo Gomes; Marques da Silva Anderson Gabriel; Vaz de Miranda Debora Michelini; Monteiro Adriano Li**oa; Robles Dutenhefner Patricia Alejandra^*

来源：Applied Catalysis A: General , 2013, 462: 39-45.

DOI：10.1016/j.apcata.2013.04.034

• Suzuki cross-coupling
• Palladium and Palladium-gold catalysts
• Mesoporous molecular sieves

Palladium and palladium-gold containing siliceous-MCM-41 and sol-gel palladium and palladium-gold silica composites have been prepared. The catalytic performance of incorporated Pd/MCM-41, Au-Pd/MCM-41 and Pd and Au-Pd/SiO2 sol-gel catalysts for the Suzuki-Miyaura cross-coupling reaction was determined and the influence of the matrix and the catalyst composition on the catalytic activity were also studied. The catalysts were characterized by N-2 physisorption (BET/BJH methods), X-ray diffraction, temperature programmed reduction analysis, H-2 chemisorption, atomic absorption spectrophotometry and Raman spectroscopy. The silica-containing palladium and palladium-gold catalysts prepared using the MCM-41 matrix showed greater catalytic activity than using the conventional sol-gel method; however, gold had a significant influence on this reaction. The catalyst did not undergo metal leaching and could be easily recovered and re-used (reused).

• 出版日期2013-7-10