Abstracts

Noble metal nanoparticles supported on amino-functionalized mesoporous silica as catalyst for tandem reaction

by Qian Sun




Institution: Theseus
Department:
Year: 2017
Posted: 02/01/2018
Record ID: 2171988
Full text PDF: http://www.theseus.fi/handle/10024/133649


Abstract

Mesoporous materials are a type of porous materials with ordered pores on the range of 2-50 nanometers, which have attracted great attention because of wide applications in adsorption, separation, catalysis, electrode materials, chemical sensors and optoelectronic devices, and so on, due to their high surface area, ordered mesopores and tunable pore distribution. The pore size of mesoporous silica is large enough to accommodate a variety of large molecules, and the high density of silanol groups on the pore wall is beneficial to the introduction of functional groups with a high coverage. Recently, many researches have focused on the catalytic action of amino-functionalized mesoporous silica. Here, the aim is to synthesize a bifunctional mesoporous silica [emailprotected], the process of synthesis is as follows. Using an anionic surfactant as the template and organosilane as co-structure directing agent, amino-functionalized mesoporous silica nano spheres (NH2-MSNSs) were synthesized by self-assembly. After extraction of the anionic surfactant templates by solvent, silica nano-spheres with ordered and radially oriented amino-functionalized mesochannels were obtained. Then, we utilized the amine groups immobilized on the mesoporous surface as stabilizing and capturing agents to prepare Pd nanoparticle supported NH2-MSNSs catalysts. The Pd-supported catalysts exhibited high and stable activity in aerobic oxidation of benzyl alcohol, which is benefit for the tandem reaction of alcohol oxidation to dehyde and Knoevenagel condensation reaction. The di-functional mesoporous silica [emailprotected] exhibited better catalytic action than mono-functionalization mesoporous silica NH2-MSNSs and [emailprotected]