PREVIOUSpapers of this series described the cracking of a number of paraffins, olefins, and naphthenes over a silica-zirconiaalumina catalyst under conditions similar to those employed in the commercial cracking of petroleum fractions (4, 6, ß). Results are given here from the cracking of various kinds of aromatics. As before, an effort is made to compare the catalytic with the thermal cracking of the same compounds. Thomas, Hoekstra, and Pinkston (13) studied the catalytic cracking of some alkylbenzenes, and reported results similar to ours.
LITERATURE CITED(1) Am. Soc. Testing Materials, Standard Methods of Tension Testing of Vulcanized Rubber, Designation D412-41.(2) Ibid., Standard Methods of Test for Abrasion Resistance of Rubber Compounds, Designation D394-40.(3) Ibid., Tentative Methods of Test for Comparison Fatigue of Vulcanized Rubber, Designation D623-41T. (4) Ibid., Tentative Methods of Test for Compression Set of Vulcanized Rubber, Designation D395-40T.(5) Ibid., Tentative Methods of Test for Tear Resistance of Vulcanized Rubber, Designation D624-41T.
Cracking over a silica-zirconia-alumina catalyst at 350-500°C. of seven aliphatic olefins, two diolefins, two cyclic olefins, and two aromatic olefins was studied. The principal conversions of aliphatic mono-olefins were isomerization, cracking, saturation, and formation of higherboiling materials and coke. Diolefins and aromatic
INDUSTRIALAND ENGINEERING CHEMISTRY Vol. 37, No. 10 tenes, and butanes. The large amount of isobutene is note-
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