Journal
ACS Catalysis
Volume 5, Issue 11, Pages 6823-6827Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b01597
Keywords
rhenia; alumina; sites; olefin metathesis; titration; Raman
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Funding
- U.S. DOE Basic Energy Sciences [FG02-93ER14350]
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The number of surface rhenia sites on alumina participating in olefin metathesis, usually counted by chemical titration of surface reaction intermediates with olefins, has been debated for several decades. The current olefin titration measurements, however, demonstrate that the number of reactive surface intermediates on supported rhenia/alumina catalysts is strongly dependent on the experimental variables. The new findings reveal that the accepted titration procedures significantly undercount the number of activated surface rhenia sites upon exposure to olefins by similar to 10(1)-10(2) because of invalid assumptions.
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