| abstract |
Catalysts with bimodal distribution of pore radii, consisting essentially of a) 10 to 99.9% by weight of zirconium dioxide, which occurs in monoclinic modification at 50 to 100% by weight, and b) 0 to a 60% by weight of aluminum oxide, silicon dioxide and / or titanium dioxide, and c) 0.1 to 10% by weight of at least one element selected from the first or second major group, from the third or eighth secondary group of the periodic system of the elements, and tin, with the condition that the sum of weight percentages of by result 100. |