Journal
APPLIED CLAY SCIENCE
Volume 214, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.clay.2021.106272
Keywords
Catalysis; Palladium; Nanoclays; Halloysite nanotubes (HNTs); Alumina; Silica; Nanocatalysis
Funding
- Ministerio de Ciencia e Innovacion of Spain [RTI2018-094322-B-I00]
- Direccion General de Investigaci 'on e Innovacion, Consejeria de Educacion e Investigacion de la Comunidad de Madrid [PEJD-2017-PRE/AMB-4047]
- Universidad Rey Juan Carlos (International School of Doctoral Studies)
- Banco de Santander [496679]
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A series of hybrid Sup-L-Pd catalysts with different nano-sized supports, ligands and quantities of Pd were prepared and studied for their catalytic activity in C-C coupling, selective oxidations, and dehalogenation-hydrogenation processes. Among them, the HNTs-PPETS-Pd0.25 catalyst showed the most promising catalytic behavior and potential reusability in various catalytic processes. It demonstrated high turnover frequency values in catalytic reactions and good recyclability with low Pd leaching after consecutive cycles.
A series of hybrid catalysts of the type, support-ligand-Pd (Sup-L-Pd), has been prepared and characterized and their activity in C-C coupling (Suzuki-Miyaura), selective oxidations and dehalogenation-hydrogenation processes studied. The hybrid Sup-L-Pd catalysts are made up of (i) different nano-sized supports, such as halloysite nanotubes (HNTs), SiO2, Al2O3 and mesoporous silica nanoparticles (MSNs), (ii) ligands (L) with N-, S- or Pdonor atoms and (iii) different quantities of Pd. Several combinations of support, ligand, and Pd quantity were used to determine the optimal composition of the nanostructured systems for the proposed catalytic reactions. The system based on HNTs functionalized with 2-(diphenylphosphino)ethyltriethoxysilane (PPETS) and 0.25% wt. Pd (HNTs-PPETS-Pd0.25) showed the most promising catalytic behaviour with multifunctional applicability in different catalytic processes and potential reusability. This catalyst gave turnover frequency (TOF) values of up to 155 h-1 in catalytic Suzuki-Miyaura C-C coupling reactions, up to 43 h-1 in selective catalytic oxidations and up to 65 h-1 in dehalogenation-hydrogenation processes of halogenated aromatic compounds. Furthermore, the system demonstrated in the different catalytic reactions, good recyclability after consecutive cycles with low Pd leaching.
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