Residue catalysts increased zeolite content

From the operation results of the RFCC industrial apparatus it is seen that in comparison with the commonly used residual oil cracking catalyst CHZ-2, the CHZ-3 catalyst with the Si-rich zeolite as the active component increases the content of low-pressure residual oil by 8.02%, whereas it decreases the oil pulp yield by 1.34% under circumstances where the coke yield remains constant. Meanwhile, the light-oil component yield increases by 1.10%, whereas the combined yeild of liquefied gas + light oil increases by 1.73% if CHZ-3 catalyst is used, indicating that this catalyst has excellent activity-stability as well. 

Zeolites, by being in a half way between amorphous silica-alumina and fluorinated alumina, were early recognized as potential components of bifunctional isomerization catalysts. The earliest report of zeolites being used in this application deal on Pt containing X and Y structures (3). They found that the activity increased from the Na to the Ca to the decationized forms. The residual sodium content, and therefore the final acidity of the Pt or Pd HY zeolite catalysts was critical for these type of catalysts (2,4-6). However, to make a successful commercial catalyst the following characteristic have to be accomplished by the zeolitic component ... 

Removal of sodium from the early Y-zeolites remained an urgent priority for catalyst manufacturers who were attempting to increase gasohne yield and obtain catalysts with higher thermal stabihty. Experimental woik with Y-zeohte had confirmed the benefits of a catalyst with low residual sodium content, but repeated exchange with ammonimn sdts was too expensive to be used commercially. Consequently the Y-zeolite produced commercially was not sufficiently stable. 

---