ISSN:
1572-879X
Keywords:
oxidative dehydrogenation
;
catalytic alkane oxidation
;
olefin production
;
Pt-Sn catalysts
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The addition of various metals to Pt-coated ceramic foam monoliths was examined for the autothermal oxidative dehydrogenation of ethane to ethylene at 900°C at contact times of 5 ms. The addition of Sn or Cu to Pt-monoliths enhanced both C2H6 conversions and C2H4 selectivities significantly, giving higher C2H4 yields. No deactivation or volatilization of the catalysts was observed. For Pt-Sn, an increase in the Sn/Pt ratio from 1/1 to 7/1 increased both the conversion and the selectivity. For Pt-Sn (Sn/Pt = 7/1) versus Pt alone the conversion increased by up to 6% and the selectivity up to 5% for an increase in optimal yield from 54.5% with Pt to 58.5% with Pt-Sn. XRD and XPS measurements showed that Pt existed in the form of PtSn and Pt3Sn alloys. The 1/1 Pt-Cu catalyst showed comparable performance, with conversion increasing by 5% and selectivity by 3%. The addition of several other metals to Pt-monoliths decreased both C2H6 conversion and C2H4 selectivity in the order, Sn〉Cu〉Pt alone〉Ag〉Mg〉Ce〉Ni〉La〉 Co. For oxidative dehydrogenation ofn-butane and isobutane, Pt-Sn and Pt-Cu also showed higher conversion than Pt.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00806566
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