LOW-TEMPERATURE CONVERSION OF OLEFIN-CONTAINING INDUSTRIAL GASES ON Me(Zn,W)/KH-4/Al2O3 HETEROGENEOUS SYSTEMS

Abstract: Heterogeneous composite catalytic systems of the type Me(Zn,W)/KH-4/Al₂O₃ were investigated in the conversion of the butane–butylene fraction obtained from the catalytic cracking unit of the Heydar Aliyev Refinery Plant. The initial carrier was an industrial catalytic cracking catalyst KH-4, modified with Zn and W salts. The catalysts were tested on a laboratory setup at 220ºC, t=1-6 hours, WSHV=500 h^-1. The analysis of feedstocks and reaction products was carried out on a Perkin Elmer AutoSystem XL chromatograph. The thermal stability of the samples was studied using JUPITER synchronous thermal analyzer TG/DTA STA-449 (Germany) V-10°/min, T=25-700°C, V_N2=20 ml/min, m=10 mg. The content of the compaction products was determined by burning coke, followed by gravimetric determination of the weight gain of ascarite tubes, and also by the DTA and TG methods, V=20 K×min^-1 in the air flow. The formation of high-octane components Σ(C₅-C₈) was established with a conversion of 66.9% on Zn/KH-4/Al₂O₃ with a selectivity for fr.ΣC₅-C₆ of 53.5%, and on the catalyst W/KH-4/Al₂O₃ of 76.3% with a selectivity of fr.ΣC₅-C₆ of 54.8%. Both fresh and spent catalysts are thermally stable up to 750ºC and exhibit stable catalytic activity for 6 hours, and the coke content up to 3.5% for Zn/KH-4/Al₂O₃ and 6.5% for W/KH-4/Al₂O₃ does not change the conversion of feedstocks.