Mixed organometallic compositions comprising elements from the lanthanide group and manganese or elements from the iron group, process for the preparation of said compositions, and their use as fuel additives

摘要

A mixed organometallic composition suitable for use as fuel additives contains an organic acid salt of at least one metal from the lanthanide group and of at least one metal selected from the group formed by manganese and the metals of the iron group wherein the ratio of total number of metal atoms to number of organic acid equivalents is greater then the stoichiometric proportion, and preferably greater than 2.