Synthesis and characterization of platinum nanoparticle catalysts capped with isolated zinc species in SBA-15 channels: the wall effect

DOI: 10.1021/acsanm.8b01357

Authors: Elizabeth Raine (University of Oxford) , Adam Clark (University College London (UCL)) , Glen Smales (University College London (UCL)) , Andrew Smith (Diamond Light Source) , Diego Gianolio (Diamond Light Source) , Tong Li (Ruhr-Universität Bochum) , Jianwei Zheng (University of Oxford) , Benjamin Griffith (University of Warwick) , Timothy I. Hyde (Johnson Matthey) , Mark Feaviour (Johnson Matthey) , Paul Collier (Johnson Matthey) , John V. Hanna (University of Warwick) , Gopinathan Sankar (University College London) , Shik Chi Edman Tsang (University of Oxford)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Acs Applied Nano Materials

State: Published (Approved)
Published: November 2018
Diamond Proposal Number(s): 16316 , 16583

Abstract: The strong directing effects and difficulties in the removal of organic based surfactants makes the templated synthesis of nanoparticles in solid porous structures of defined molecular sizes such as SBA-15, without the use of surfactants, considerably attractive. However, the effects of their internal surface structures, adsorption affinities and lattice mis-match on the particle morphology grown therein have not been fully appreciated. Here, we report the internal surface of the silica preferentially hosts isolated tetrahedrally coordinated oxidic Zn species on the molecular walls of the SBA-15 channels from wet impregnated Zn2+ and Pt2+ species. This leads to less thermodynamic stable but kinetic controlled configuration of atomic zinc deposition on core platinum nanoparticles with unique confined lattice changes and surface properties to both host and guest structures at the interface upon reduction of the composite. This method for the formation templated nanoparticles may generate interests to form new tunable materials as dehydrogenation catalysts.

Journal Keywords: Nanoparticle; SBA-15; Single atom; Decoration; Support; Wall effect; Catalyst

Subject Areas: Chemistry


Instruments: B18-Core EXAFS , I22-Small angle scattering & Diffraction