Supported sub-nano clusters hold {great|fantastic|excellent|wonderful|good|terrific} {promise|guarantee} as economical and {highly|extremely|very|hugely} active catalysts. {However|Nevertheless|Nonetheless|Even so|On the other hand|Having said that}, they {tend to|have a tendency to|often|are inclined to|are likely to|usually} deactivate {rapidly|quickly|swiftly} by poisoning and sintering, impeding their widespread use. We {find|discover|locate|uncover|come across|obtain} that self-limiting poisoning can stabilize and {promote|market} cluster catalysis, i.e., poisoning {is not|isn’t|just isn’t|is just not|will not be} {always|usually|often|constantly|generally|normally} detrimental, but can {sometimes|occasionally|at times|often|from time to time|in some cases} be exploited. {Specifically|Particularly|Especially}, Pt-Ge alloy clusters supported on alumina undergo slow coking (carbon deposition) {under|below|beneath} {conditions|circumstances|situations} of thermal dehydrogenation, {yet|however|but} preserve {strong|powerful|robust|sturdy} binding {sites|websites|web sites|internet sites|web-sites|web pages}. For the case of Pt4Ge/alumina, theory shows {a number of|numerous|several|quite a few|a variety of|many} thermally populated isomers, {one|1|a single|one particular} of which catalyzes carbon deposition. {Because the|Since the} clusters are fluxional at {high|higher} temperatures, this isomer acts as a gateway, {slowly|gradually} converting {all the|all of the|each of the} clusters to Pt4GeC2. The surprising {result|outcome} {is that|is the fact that} Pt4GeC2 is {highly|extremely|very|hugely} catalytically active and selective against {further|additional} coking, i.e., coking produces functional, {stable|steady} catalytic clusters. Ge and C2 have synergistic electronic effects, {leading|top|major} to {efficient|effective} and {highly|extremely|very|hugely} selective catalytic dehydrogenation that stops at alkenes, and {improving|enhancing} stability. {Thus|Therefore|Hence|As a result}, {under|below|beneath} reaction {conditions|circumstances|situations}, the clusters {develop|create} into a robust catalyst, suggesting an {approach|method|strategy} to practicable cluster catalysis. 1089706-28-4 Purity Bromo-PEG1-CH2-Boc Formula PMID:24282960
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