218
S. Sato et al. / Applied Catalysis A: General 453 (2013) 213–218
at 300 ◦C, whereas the initial activity was high. Tetragonal ZrO2
also showed the same catalytic activity as alumina at 350 ◦C. The
catalytic activity of alumina modified with either Cu or Rh was
stabilized in the conversion of THFA into DHP under H2 flow con-
ditions. The optimum activity was obtained in the catalysts at
CuO contents of 5–10 wt.%: the selectivity to DHP exceeded 85%
and the best mass balance was achieved. CuO was reduced to
metallic Cu that was maintained during the reaction at 300 ◦C,
Cu metal probably works as a remover for deposited carbon and
prevents coke formation by the aid of hydrogen. In the conver-
sion of THFA to DHP, we propose that THFA is initially rearranged
into 2-hydroxytetrahydropyran as an intermediate that is rapidly
dehydrated to DHP. The first-step rearrangement could be the rate-
determining step in the reaction.
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