| 摘要 |
1315022 Catalytic recombiner for secondary battery OLDHAM INTERNATIONAL Ltd 12 Oct 1970 [15 Oct 1969] 48417/70 Heading B1F [Also in Division H1] . Catalytic recombination of hydrogen and oxygen released from a secondary battery during charging is effected by using a catalyst structure C, Fig. 3 comprising an inner catalyst N, Fig. 8 which has a high level of activity, surrounded by catalyst M which has a low level of activity which increases as it is heated and while - capable of recombining hydrogen and oxygen gas at a raised temperature at or below 250‹C. Thus initially the gas mixture passes through catalyst M and reacts exothermically on catalyst N. The heat thus generated accumulates and heats catalyst 17 so that reaction takes place on catalyst M. The effect is stated to be that as the gas pressure in the battery increases, the rate of rise of temperature of the catalyst decreases, and the temperature may even decrease. The catalytic material may be such that when exposed to a gas pressure of up to 4 atmospheres of H 2 and O 2 in stoichiometric ratios, its temperature will not rise above 600‹C. Catalyst N may comprise cylindrically shaped alumina pellets with an internal surface area of about 90 sq m/g impregnated or coated with 0.5% Pd by weight. Catalyst M may be cylindrically shaped pellets of alumina having an internal surface of less than 1mg m/g impregnated or coated web 0.01% Pd by weight. |
