丙烷脱氢反应中水滑石基催化剂选择性的建模,Industrial & Engineering Chemistry Research

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丙烷脱氢反应中水滑石基催化剂选择性的建模
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-10-09 , DOI: 10.1021/acs.iecr.3c01076
Giovanni Festa ₁ , Palma Contaldo ₁ , Marco Martino ₁ , Eugenio Meloni ₁ , Vincenzo Palma ₁

Affiliation

目前石化行业采用的丙烯生产工艺（石脑油和轻柴油的流化催化裂化和蒸汽裂化）无法满足工业应用对丙烯需求的增长。为此，人们对丙烯生产的替代工艺进行了研究，其中，丙烷脱氢（PDH）工艺，允许生产丙烯作为主要产品，已经在工业上实施（例如，Catofin和Oleflex工艺）。这种方法的主要缺点与达到可持续丙烷转化所需的高温密切相关，由于催化剂表面形成焦炭，从而影响催化剂稳定性。因此，需要定期再生催化床。在这项工作中，从丙烷转化率和丙烯选择性方面研究了由氧化铝和水滑石基载体制备的不同 Sn-Pt 催化剂在 PDH 反应中的性能，以确定比商用催化剂更稳定的催化剂。那些。实验测试证明，使用商业水滑石 PURALOX MG70 颗粒制备的催化剂获得了最佳性能。该催化剂显示，在 1 和 5 bar 的压力条件下（为了评估集成膜反应器的潜在未来应用），在所有研究的温度范围（500–600 °C）下，丙烷转化率值接近热力学平衡值。）且选择性始终高于95%。因此，我们还在 500 °C 和 5 bar 下进行了稳定性运行测试：结果表明，丙烷转化率仅损失 12%，而丙烯选择性没有变化。为了评估动力学参数，还进行了适当设计的实验测试，并对开发的数学模型进行了优化，以有效地描述系统行为和催化剂失活。

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Modeling the Selectivity of Hydrotalcite-Based Catalyst in the Propane Dehydrogenation Reaction

The propylene production processes currently used in the petrochemical industry (fluid catalytic cracking and steam cracking of naphtha and light diesel) are unable to meet the increase of propylene demand for industrial applications. For this reason, alternative processes for propylene production have been investigated, and among the others, the propane dehydrogenation (PDH) process, allowing the production of propylene as a main product, has been industrially implemented (e.g., Catofin and Oleflex processes). The main drawback of such processes is closely linked to the high temperature required to reach a sustainable propane conversion that affects catalyst stability due to coke formation on the catalyst surface. Accordingly, the periodic regeneration of the catalytic bed is required. In this work, the performance in the PDH reaction of different Sn–Pt catalysts, prepared starting by alumina- and hydrotalcite-based supports, is investigated in terms of propane conversion and selectivity to propylene in order to identify a more stable catalyst than the commercial ones. The experimental tests evidenced that the best performance was obtained using the catalyst prepared on commercial pellets of hydrotalcite PURALOX MG70. This catalyst has shown, under pressure conditions of 1 and 5 bar (in order to evaluate the potential future application in integrated membrane reactors), propane conversion values close to the thermodynamic equilibrium ones in all of the investigated temperature ranges (500–600 °C) and the selectivity was always higher than 95%. So, this catalyst was also tested in a stability run, performed at 500 °C and 5 bar: the results highlighted the loss of only 12% in the propane conversion with no changes in the selectivity to propylene. Properly designed experimental tests have also been performed in order to evaluate the kinetic parameters, and the developed mathematical model has been optimized to effectively describe the system behavior and the catalyst deactivation.

更新日期：2023-10-09

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