1104.    FROLICH, P. K., FENSKE, M. R., AND QUIGGLE, D.  Studies of Copper Catalysts Prepared From Precipitated Hydroxides.  I.  Activity as a Function of the Temperature of Precipitation.  Jour. Am. Chem. Soc., vol. 51, 1929, pp. 61-65; Chem. Abs., vol. 23, 1929, p. 1342.

       Activity for the decomposition of CH₃OH of Cu catalysts prepared from the NH₃ precipitated hydrates varied markedly with the temperature of precipitation.  A maximum in activity was observed with catalysts precipitated at about 22°.  X-ray examination of the dried gels before reduction indicated that the activity was associated with small particle size.  The maximum of the activity curve may have been the result of 2 opposing factors:  (1) the tendency for the initial particle size to decrease with decreasing temperature of precipitation; and (2) the tendency for the initially formed particles to grow while drying at 110°.