Anglo American Research Laboratories

Over AU/AI2O3 the reaction between carbon monoxide and nitric oxide is severely inhibited by oxygen, and this unfortunately militates against the promise of its use for three-way conversion at low temperature. Nevertheless the effectiveness of a gold-containing catalyst developed at the Anglo-American Research Laboratories in South Africa has been demonstrated (Figure 11.3).42 It consisted of 1% Au/CoOx in admixture with... 

Figure 11.3 Temperature-dependence of conversion of pollutants effected by the Anglo-American Research Laboratories catalyst under reducing gasoline conditions (see text for details).42...

A gold-based material has been formulated for use as a three-way catalyst in gasoline and diesel applications.28 This catalyst, developed at Anglo American Research Laboratories in South Africa, consisted of 1% Au supported on zirconia-stabilized-Ce02, ZrC>2 and TiC>2, and contained 1% CoOx, 0.1% Rh, 2% ZnO, and 2% BaO as promoters. The catalytically active gold-cobalt oxide clusters were 40-140 nm in size. This catalyst was tested under conditions that simulated the exhaust gases of gasoline and diesel automobiles and survived 773 K for 157 h, with some deactivation (see Section 11.2.7). 

The catalyst, developed at Anglo American Research Laboratories (AARL), consists of lwt% An supported on zirconia-stabilised Ce02, Zr02 and Ti02, and contains as promoters 1 wt% CoO , 0.1 wt% Rh, 2wt% ZnO and 2wt% BaO. The catalytically active gold on cobalt oxide clusters are in the range of 40-140 nm (see Fig. 6.23). 

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