Synthesis of zeolite beta/A1-HMS composite for cracking of lubricant oil, grease and polypropylene

Abstract

The zeolite beta/Al-HMS composite has been successively synthesized by direct method from crystalline zeolite beta. The zeolite beta was prepared by hydrothermal crystallization at 135°C, then it was dissolved in base solution, followed by co-crystallization with Al-HMS. The final product was defined as composite material between zeolite beta and Al-HMS. The effects of parameters such as crystallization time and NaOH concentrations were investigated. The composite were characterized by X-ray power diffraction, scanning electron microscope, ICP-AES, 27Al-MAS-NMR and nitrogen adsorption-desorption technique. Catalytic cracking of zeolite beta/Al-HMS composite on grease, lubricant oil and PP were studied in various conditions. The optimal conditions in this study for cracking of grease, lubricant oil and PP were 400°C 90 min, 380°C 90 min and 380°C 60 min, respectively. The major component of gas products obtained by grease and lubricant oil cracking was 1,3-butadiene whereas, i-pentane was the main product for PP cracking. Carbon distribution number of distillate liquid product had boiling point range similar to that of the SUPELCO of standard gasoline. The composite catalyst for PP cracking could be regenerated for 3 cycles and was acceptable due to a high conversion of PP over 90%.