Abstract: A method for producing an alkenylbenzene by catalytically dehydrogenating an alkylbenzene non-oxidatively in the presence of steam in the reaction zone comprising a fixed-bed of potassium-containing dehydrogenation catalyst particles, wherein the potassium-containing dehydrogenation catalyst particles are prevented from powdering by (a) using a fixed-bed comprising particles of at least two kinds of potassium-containing dehydrogenation catalyst with respectively different potassium contents and (b) arranging the catalyst particles so that those with higher potassium content are not disposed on the inlet side of said catalyst bed with respect to the reaction.

Abstract: An ignition distributor for automotive vehicles comprises a shaft, a rotor arm mounted on the shaft for rotation therewith, a stationary center electrode mounted coaxially with the shaft, and a plurality of angularly spaced stationary outer electrodes. A contact member is secured to the rotor arm which extends between the center of the shaft and a point adjacent to the outer electrode and comprises a baseplate secured to the rotor arm and a resistive film secured to the baseplate, the latter being in electrical contact with the center electrode and in radially inwardly spaced from the outer electrode such that a sudden breakdown of air occurs when the outer end of the contact plate is positioned in proximity to the outer electrode generating an electric discharge. The baseplate is composed of a material having lower electrical conductivity than that of the resistive film so that a distributed constant RC transmission path is formed along the passage of the discharge current.