《Table 2 Chemical compositions of the calcined samples》

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《Preparation of CeO_2-Modified Mg(Al)O-Supported Pt–Cu Alloy Catalysts Derived from Hydrotalcite-Like Precursors and Their Catalytic Behavior for Direct Dehydrogenation of Propane》

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a The numbers in parentheses are the nominal compositions in the synthesis mixture and those without parentheses are determined by ICP-OESanalysis

The calculated lattice parameters of the precursors are listed in Table 1.The a values of CuMgAl-P，Ce 3.0 MgAl-P，and PtCuCe x MgAl-P samples increase compared to that of MgAl-P.Additionally，the presence of small amounts of Ce 3+ions gives rise to an increasing value of lattice parameter a across PtCuCe 0.1 MgAl-P，PtCuCe 0.3 MgAl-P，and PtCuCe 0.6 MgAl-P，followed by a decrease with further increase in the Ce content.For CuMgAl-P，the octahedron becomes larger because of the decrease of positive charge density in the layers incorporated with Cu 2+ions.As for the Ce-containing samples，it is mainly because Ce 3+ions have a bigger radius than Al 3+ions，which can broaden the distance between metal cations in the layers and increase the a value[31].The corresponding lattice parameter c exhibits a similar trend.Although the reasons are diff erent，it can be confi rmed that Cu 2+and Ce 3+ions can be introduced in the HT structure layers as the amounts of Cu 2+and Ce 3+ions are small.