【摘要】 为探索纳米氧化铈在催化裂解工艺中增产低碳烯烃的应用潜力，在固定流化床小型试验装置、连续进料中型试验装置及350 kt/a催化裂解工业装置上开展了试验。小型试验结果表明，纳米氧化铈负载于催化剂上可提高低碳烯烃产率，其增效作用在较低反应温度下更为明显，且存在适宜负载范围，超过该范围后增产效果逐渐减弱。中型试验结果表明，当催化剂上纳米氧化铈理论负载量为3 760μg/g时，低碳烯烃产率提高3.60百分点，转化率提高1.87百分点。工业装置验证进一步证明了该方法的可行性与有效性。吡啶吸附红外光谱（Py-IR）和氨气程序升温脱附（NH₃-TPD）表征结果显示，纳米氧化铈的引入提高了催化剂的Br??nsted酸酸量和中强酸酸量，促进了碳正离子的生成及后续裂化反应，从而提高原料转化率和低碳烯烃产率。更多还原

【Abstract】 To explore the application potential of nanoscale cerium oxide（nano-CeO₂） in catalytic cracking processes for enhancing light olefin yield, this study conducted experiments on a fixed fluidized-bed reactor, a continuous-feed pilot-scale unit, and a commercial 350 kt/a catalytic cracking unit. Results from the small-scale tests showed that loading nano-CeO₂ onto the catalyst increased light olefin yield, with a more pronounced enhancement observed at lower reaction temperatures. An optimal loading range was identified; beyond this range, the promotional effect gradually diminished. Pilot-scale trials demonstrated that, at a theoretical nano-CeO₂ loading of 3 760 μg/g on the catalyst, light olefin yield increased by 3.60 percentage points and conversion rose by 1.87 percentage points. Validation on the industrial unit further confirmed the feasibility and effectiveness of this approach. Characterization by pyridine adsorption Fourier-transform infrared spectroscopy（Py-IR） and ammonia temperature-programmed desorption（NH₃-TPD） revealed that the incorporation of nano-CeO₂ increased both Br??nsted acid site density and the amount of medium-strong acid sites on the catalyst. This promoted carbocation formation and subsequent cracking reactions, thereby enhancing feedstock conversion and light olefin yield.更多还原