제올라이트 베타의 내재적 특성이 폴리올레핀의 저온 접촉유화에 미치는 영향

Probing the Intrinsic Properties of Zeolite Beta in the Catalytic Liquefaction of Polyolefin at Low Temperatures

Pyrolysis is a well-established technology in the field of advanced recycling for polyolefin waste management. This process is pivotal in generating a spectrum of hydrocarbons, ranging from light naphtha to wax, thereby contributing to sustainable waste utilization practices. The integration of catalysts, particularly zeolites, presents an avenue to address the substantial energy consumption associated with conventional pyrolysis methods and to tailor the selectivity of product distribution. Notably, zeolite beta, characterized by its 12-membered-ring pore apertures measuring &-7 A in diameter, is well-known for its capability to yield a high liquid selectivity within the C5-C40 range during the catalytic cracking of polyolefins. The catalytic performances of zeolites in the context of polyolefin catalytic cracking are intricately associated with their intrinsic properties: Si/Al ratio, crystal dimensions, and mesoporosity. This work systematically delves into an exploration of the catalytic capabilities of various zeolite beta samples, wherein the Si/Al ratios, mesoporosity, and crystal sizes were controlled, specifically in the low-temperature (330 ° C) catalytic cracking of polyethylene. In a concerted effort to mitigate over-reaction and enhance conversion efficiency, an open batch reactor was employed.