English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present a combined experimental/theoretical study of Pt$_n$/SiO$_2$ andPt$_n$Sn$_x$/SiO$_2$ (n = 4, 7) model catalysts for the endothermicdehydrogenation of hydrocarbons, using the ethylene intermediate as a modelreactant. Supported pure Ptn clusters are found to be highly active towarddehydrogenation of C2D4, quickly deactivating due to a combination of carbondeposition and sintering, resulting in loss of accessible Pt sites. Addition ofSn to Ptn clusters results in the complete suppression of C2D4 dehydrogenationand carbon deposition, and also stabilizes the clusters against thermalsintering. Theory shows that both systems have thermal access to a multitude ofcluster structures and adsorbate configurations that form a statisticalensemble. While Pt4/SiO2 clusters bind ethylene in both di-sigma and pi-bondedconfigurations, Pt$_4$Sn$_3$/SiO$_2$ binds C2H4 only in the pi-mode, withdi-sigma bonding suppressed by a combination of electronic and geometricfeatures of the PtSn clusters. Dehydrogenation reaction profiles on theaccessible cluster isomers were calculated using the climbing image nudgedelastic band (CI-NEB) method.

Coking-Resistant Sub-Nano Dehydrogenation Catalysts: Pt$_n$Sn$_x$/SiO$_2$ (n = 4, 7)