在原油热催化裂解为轻质烯烃过程中提高 β-zeolites 性能的硅/铝比例的启示

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-08-15 DOI:10.1016/j.joei.2024.101792
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引用次数: 0

摘要

对主要石化产品(尤其是乙烯和丙烯)的需求不断增长,凸显了原油转化过程中对优质催化剂的迫切需求。要获得较高的丙烯选择性,催化剂必须具有出色的吸附能力、热稳定性、适度的表面酸度和足够大的孔隙,以促进较大原油分子的扩散。本研究采用水热法成功合成了三种不同的 BEA 沸石(β-沸石)催化剂,并将其用于阿拉伯轻质原油的催化裂化,以生产丙烯、乙烯和石脑油等有价值的石化产品。使用 27Al 和 29Si NMR、NH3-TPD、BET、XRD、TGA、FTIR、XRF 和 FE-SEM 对催化剂进行了表征。在固定床微活性试验(MAT)装置中,对阿拉伯轻质原油在 550 至 600 °C 的温度范围内的热催化裂解进行了评估。与硅/铝比率为 35 和 65 的同类产品相比,硅/铝比率为 50 的β-沸石在催化阿拉伯轻质原油裂解过程中表现出更高的催化活性。使用硅/铝比为 50 的 β-zeolite 在 600 °C 条件下可获得最高的原料转化率(83.4%)和丙烯选择性(16.11%)。重要的是,我们的研究结果表明,这些催化剂潜力巨大,可与类似反应中常用的初级 MFI 催化剂(如 ZSM-5)相媲美。这表明它们有望成为催化裂化工艺领域的首选催化剂,为石油化工生产的进步铺平道路。
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Insights into Si/Al ratios for enhanced performance of β-zeolites in thermocatalytic cracking of crude oil to light olefins

The escalating demand for key petrochemicals, particularly ethylene and propylene, underscores the critical need for proficient catalysts in crude oil conversion processes. Attaining high propylene selectivity necessitates catalysts with superior adsorption capacity, thermal stability, moderate surface acidity, and pores large enough to facilitate the diffusion of larger crude oil molecules. In the present study, three different BEA Zeolites (β-zeolite) catalysts were successfully synthesized by hydrothermal method and used for catalytic cracking of Arabian Light crude oil to produce valuable petrochemical products, such as propylene, ethylene, and naphtha. The catalysts were characterized using 27Al and 29Si NMR, NH3-TPD, BET, XRD, TGA, FTIR, XRF, and FE-SEM. The thermocatalytic cracking of Arabian Light crude oil was evaluated in a fixed-bed microactivity test (MAT) unit between 550 and 600 °C. The as-prepared β-zeolite with a Si/Al ratio of 50 exhibited better catalytic activity in the catalytic cracking of Arabian Light crude oil compared to counterparts with Si/Al ratios of 35 and 65, This superiority can be attributed to its optimal combination of surface acid site distribution, textural properties, surface morphology, and high adsorption capacity. The highest feed conversion (83.4 %) and selectivity to propylene (16.11 %) were attained using β-zeolite with a Si/Al ratio of 50 at 600 °C. Importantly, our findings suggest that these catalysts hold significant potential, rivalling primary MFI catalysts like ZSM-5 commonly employed in similar reactions. This underscores their promise as catalysts of choice in the realm of catalytic cracking processes, paving the way for advancements in petrochemical production.

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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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