Abstract: There are disclosed an improved CO indicating composition consisting essentially of fumed silica having dispersed thereon dry residues of impregnation with a solution of palladium sulfate, sulfuric acid and ammonium molybdate, a CO indicator comprising a strip of a composite of expanded, amorphous-locked tetrafluoroethylene polymer and fumed silica having dried residues of impregnation with the aforesaid solution, an improved detector containing said indicating composition or said indicator, and improved process for detecting CO comprising exposing pre-dried air to the indicating composition or said indicator to effect a color change, extracting colored material with distilled water or an aqueous buffer solution, and measuring the depth of color in the resulting extract.

Abstract: Complexes of certain transition metals and phosphine or arsine ligands with carbon dioxide, e.g., (carbon dioxide)bis[1,2-ethanediyl-bis[dimethylphosphine]-P,P']iridium(1+), chloride, useful as catalysts in hydrogenation and isomerization, e.g., of 1-butene, are prepared by direct addition of pressurized CO.sub.2 to the appropriate metal complex precursor, e.g.,(Ir[(CH.sub.3).sub.2 PCH.sub.2 CH.sub.2 P(CH.sub.3).sub.2 ].sub.2).sup.+Cl.sup.-.