1911. KÖLBEL, H., AND RUSCHENBURG, E. (Steinkohlen-Bergwerk "Rheinpreussen"). [Synthesis Catalysts.] German Patent 765,512, no date. Kainer, pp. 78 and 161.

Sintered dolomite is suitable both as support for Fe catalysts and for precipitating the catalyst from solution. Dolomite is cheaper than kieselguhr and gives catalysts of greater efficiency, since the Ca and Mg therein have activating properties.