T 3915 (OTTO) Tetraammineplatinum(II) nitrate, 99.995% trace metals basis Cas 20634-12-2 - used as a platinum (Pt) precursor to synthesize platinum-based catalysts such as Pt/cerium oxide catalysts and Pt/mesoporous carbon catalysts. T 3915 (OTTO) Tetraammineplatinum(II) nitrate, 99.995% trace metals basis Cas 20634-12-2 - used in synthesizing lean NOx trap (LNT) catalysts.