Materialovedy from University of Washington (THE USA) developed technology of receipt of bimetallic catalyst for fuel elements, which excels existent standards on efficiency in 2 – 5 times. «For the increase of efficiency of catalyst it is possible to diminish the size of incoming in him particles, trying to promote the area of working surface, and it is possible to change the structure of location of superficial atoms, — leading author of work Yunan’ tells This (Younan Xia). are We
united these approaches. Choosing a layout of atoms chart, we were stopped for the hexagonal type of grate, as the researches conducted before rotined his superiority above a square grate in the reactions of renewal of oxygen».predlozhennyy by scientists
a catalyst has a tree structure: palladic «kernel» measuring about 9 nm supports fastened on him «branches» from platinum by length of 7 nm. For the synthesis of such educations a dredge is used preliminary geared-up nanokristallov palladium, to which
add water solution of polivinilpirrolidona (stabilizator of E1201) and ascorbic acid. The got mixture is heated to 90 oWith, whereupon to it flow solution of tetrakhloroplatinata potassium K2PtCl4. On the finishing stage of process mixture is maintained during 3 hours
at 90 oWith, and then cool.Experimental verification of properties of created «nanodendritov» rotined that at a room temperature their efficiency (in a count on unit of mass of platinum) excels efficiency of modern standards of platinum catalysts
in 2,5 time (when compared to other widespread catalysts advantage increases yet). A bimetallic structure also declared oneself stable enough and successfully resisted to poisoning the by-products of reaction; it must in practice
to allow to decrease the expense of catalyst and cost of producible energy. «The major element of our technology is the hard fixing of platinum branches, — Yunan’ talks This. — From here and stability. And the set location of atoms allows on every branch
to increase activity of catalyst».v present tense scientists examine possibility of introduction to the structure of atoms other
fuel elements; catalyst with gold, consequently, will be yet more advantageous from point of counteraction to inhibition admixtures.The complete version of report of researchers is published in a magazine Science, reports "Komp’yulenta". Image of nanostruktur
from a palladium and platinum, got by a translucent electronic microscope.
