THE EFFECT OF THE NATURE OF A MODIFYING ADDITIVE (PT, ZN, GA) ON THE ACTIVITY OF OXIDE AND ZEOLITE CATALYSTS IN ETHANE DEHYDROGENATION AND AROMATIZATION

The catalytic properties of Pt, Zn, and Ga deposited on supports of va rious natures (Al2O3, SiO2, NaZSM, and HZSM) in the dehydrogenation an d aromatization of ethane were investigated. Pt-containing catalysts a re the most active in the conversion of ethane: the selectivity with r espect to ethylene is 25-87 % depending on the nature of the support. In the presence of Zn- and Ga-containing catalysts the yield of ethyle ne is 2-3 times lower than with Pt-catalysts. With HZSM modified by Pt , Zn, or Ga aromatic hydrocarbons (ArH) and methane are the main produ cts of ethane transformation. Ga/HZSM is the most efficient catalyst o f the aromatization of ethane under the conditions studied (550 degree s C, 120 h(-1)).