Tin-Assisted Fully Exposed Platinum Clusters Stabilized on Defect-Rich Graphene for Dehydrogenation Reaction

Abstract

Atomically dispersed Pt clusters and single-site Sn are fabricated together on the coreshell nanodiamond@graphene (ND@G) hybrid support (a-PtSn/ND@G). This unique atomically dispersed Pt clusters can dramatically inhibit the side reactions and present excellent catalytic performance in direct dehydrogenation of n-butane at 450 °C, with >98% selectivity toward olefin products, in comparison with that of Al2O3 supported Pt3Sn alloy nanoparticles (Pt3Sn/Al2O3), due to the efficient utilization of Pt atoms and facile desorption of olefin. The combined results of density functional theory (DFT) calculation, HAADF-STEM and X-ray absorption fine structure (XAFS) results provide substantial insights that Pt clusters can be atomically dispersed and stabilized on the ND@G support by the assistance of single-site Sn species as a diluent agent and by the formation of Pt-C bond between Pt clusters and defective graphene nanoshell.

Adsorption Properties of Pd3-Modified Double-Vacancy Defect Graphene toward SF6 Decomposition Products

“…Ma et al reported hydrogen adsorption on Co-4-doped defective graphene and discovered that point defects in graphene can effectively improve the hydrogen storage capacity of Co-4 [ 21 ]. Despite much research on defective graphene [ 22 , 23 , 24 , 25 ], few relevant research on SF 6 decomposition product detection have been reported.…”

Atomic‐Level and Modulated Interfaces of Photocatalyst Heterostructure Constructed by External Defect‐Induced Strategy: A Critical Review

“…[ 16,17 ] These defective areas act as the atomic‐scale interfaces with high surface free energies and affinities toward molecules/ions serving as the anchoring sites for other semiconductor molecules, nanoparticles, or clusters. [ 18,19 ] The formation of heterostructures in the defect‐containing regions may help us solve the metastability problem of defective structures and create unique architectures with spatially modulated properties. Generally, i) defective structures can be repaired with heterogeneous atoms to achieve stable photocatalytic performance; ii) the smaller interfacial distance/thickness may enhance the speed of electron transport because of the stronger contact force and higher compactness of the interface; and iii) the interfacial area can be determined from the area occupied by defects to improve the flux of electron through interface.…”

CrO supported on high-silica HZSM-5 for propane dehydrogenation

“…For instance, Cr species supported on ZrO 2 were observed to deactivate faster than Cr/Al 2 O 3 in PDH due to the presence of weak metalsupport interactions between Cr species and ZrO 2 [13] . Also, it was reported that metal species supported on nanocarbons exhibited high catalytic activity and stability for dehydrogenation and hydrogenation reactions, due to the presence of strong interactions between metal and nanocarbon supports [21][22][23] . Therefore, the selection of supports for preparation of Cr-based catalysts for PDH is of great significance.…”