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The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Topics in Catalysis
Publisher name: Springer
Place: Heidelberg
Page from-to: 843-853
Titles:
Language Name Abstract Keywords
cze Role distribuce Ni částic na vliv Ce jako promotoru v C2-ODH reakci Cílem práce bylo analyzovat a diskutovat vliv ceru na katalytické chování odlišných typů částic niklu v oxidativní dehydrogenaci etanu. Ni-Al a Ni-Ce-Al katalyzátory byly připraveny z nitrátu ceru a nitrátu niklu nebo acetátu niklu jako prekurzoru. Připravené materiály byly charakterizovány pomocí XRD, DR-UV-VIS a H2-TPR. Bylo zjištěno, že přídavek ceru ovlivňuje redukovatelnost Ni částic a jejich populaci. oxidativní dehydrogenace; etan; cer; promotor
eng The Role of Ni Species Distribution on the Effect of Ce as a Promoter in C2-ODH Reaction The aim of work was to analyse and discuss the effect of cerium on the catalytic behaviour of different types of nickel species in the oxidative dehydrogenation of ethane. Ni-Al and Ni-Ce-Al catalysts were prepared from cerium nitrate and nickel nitrate or nickel acetate as a precursor. As-prepared materials were characterized by using of XRD, DR UV-Vis spectroscopy and H-2-TPR. It was found that the addition of cerium affects both the reducibility of nickel species and the population of nickel species. Firstly, the addition of cerium led to the significant decrease of the reduction peak at 755-785 degrees C to about 40 degrees C due to the Ni-Ce interaction at both Ni-Ce-Al-NO3 and Ni-Ce-Al-ac catalysts. Secondly, the addition of cerium affected the relative population of nickel species in tetrahedral and octahedral coordination, which population originated from used nickel precursor. The presence of cerium in Ni-Ce-Al-NO3 catalysts led to the decrease in the relative population of Ni(T-d ) species, while the crystal size of NiO in Ni-Ce-Al-ac catalysts decreased with increasing Ce/Ni ratio. The highest ethylene productivity was achieved on catalysts with Ce/Ni molar ratio 0.13. Catalysts exhibited an ethylene productivity up to 1.0 gC(2)=center dot g(cat)(-1)center dot h(-1) with a selectivity of 82 % (Ni-Ce-Al-NO3) and 1.3 gC(2)=center dot g(cat)(-1)center dot h(-1) with a selectivity of 75 % (Ni-Ce-Al-ac). Oxidative dehydrogenation; Ethane; Cerium; Promoter

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