Abstract: This marking plate, which can be a license plate or a signage plate, comprises at least one base plate and symbols obtained by stamping the marking plate. The base plate is composed of a composite material containing a matrix and a fiber reinforcement comprising natural fibers.

Abstract: Catalysts for the preparation of unsaturated nitriles by the ammoxidation of olefins, the catalysts comprising a combination of the oxides of antimony, tin, zirconium, copper, and tungsten having the general formula:Sb.sub.a Sn.sub.b Zr.sub.c Cu.sub.d W.sub.e O.sub.fwhere a is from 1 to 10, b is from 1 to 10, c is 1, d is from 0.01 to 5, e is from 0.01 to 0.05, and f is the number of oxygen atoms in the oxidized combination with the metallic elements, together with processes for the preparation of nitriles by olefin ammoxidation, particularly acrylonitrile produced by ammoxidizing propylene, using such catalysts.

Abstract: Catalysts for the preparation of unsaturated nitriles by the ammoxidation of olefins, such catalysts being oxides of antimony and of tin together with one or more polyvalent metal oxides and one or more monovalent metal compositions of the general formulaSb.sub.a Sn.sub.b (Me.sub.c).sub.m (A.sub.d).sub.n O.sub.e (I)wherein Me represents a polyvalent metal and A a monovalent metal; a is from one to ten, b is from one to ten, c is from 0.01 to five, and d is from 0.01 to five; m and n are integers equal to or greater than one; and e is the number of oxygen atoms combined with the metallic elements, together with processes for preparing nitriles by ammoxidation of olefins, especially acrylonitrile from propylene, utilizing such ammoxidation catalysts.

Abstract: Catalysts for the preparation of unsaturated nitriles by the ammoxidation of olefins, the catalysts comprising oxides of antimony, tin, tungsten, and copper having the general formulaSb.sub.a Sn.sub.b W.sub.c Cu.sub.d O.sub.e (I)wherein a is from one to ten, b is from one to ten, c is from 0.01 to 5, d is from 0.01 to 5, and e is the number of oxygen atoms in combination with the metallic elements of formula (I), together with processes for preparing unsaturated nitriles by olefin ammoxidation, and particularly for preparing acrylonitrile from propylene, utilizing such catalysts.