Metal Migration from Zeolites onto Iron Oxide: An Alternative to Hydrogen Spillover

Influence of ferric oxide modification on the properties of copper oxide supported on γ-alumina

“…for sample F03, the peak at 207°C shifts to 192°C, which has a shoulder peak at about 200°C. Since TPR peaks of dispersing species will shift toward lower temperature [29], the peaks at about 207 or 192°C are assigned to surface-dispersed copper species, and the peak at 236°C is attributed to crystalline CuO species [30]. These entire phenomena indicate that the crystalline CuO in while the peak at 410°C disappeared accordingly.…”

Study on Sn-Fe-Cr Composite Oxides: Novel, Active and Thermally Stable Catalysts for CH4 Total Oxidation

“…It is noted here that a similar reduction behavior was observed for SnFeCr1 and SnFeCr3. Earlier work demonstrated that no reduction occurred to unsupported bulk Cr 2 O 3 below 800 • C [31,32]; while for Fe 2 O 3 , a small peak positioned at ∼ 450 • C corresponding to the reduction of Fe 2 O 3 to Fe 3 O 4 , and a large and wide one located from 550 to 800 • C corresponding to the further reduction of Fe 3 O 4 were typically observed [31,33]. Therefore, the 625 • C peak of SnFeCr2 could be assigned to the overlapped reduction of Sn 4+ and Fe 3+ cations in the samples.…”

Synergism of cobalt and palladium in MFI zeolite of relevance to NO reduction with methane

“…No H spillover appears to occur along zeolite walls. [38][39][40] Whether the resulting bimetal cluster will form a layered particle or a solid solution of both metals, depends on the temperature and the nature of the two metals.…”