Yao Songlu, Gong Jianhong, Zhang Xiaoqiao, Wei Xiaoli, Wang Di, Chen Tengwei
Research Institute of Petroleum Processing Co., Ltd, SINOPEC 18 Xueyuan Road Beijing 100083 PR China
RSC Adv. 2025 Jun 5;15(24):19034-19042. doi: 10.1039/d5ra02427g. eCollection 2025 Jun 4.
Considerable energy consumption and high CO emissions of steam cracking have driven the exploration of alternative methods for light olefins production from naphtha. In this context, we propose a novel dehydrogenation cracking approach as an alternative route for naphtha conversion. By employing a perovskite-based redox catalyst, CaMnO@NaWO, in combination with zeolite-based catalyst, model compound -octane undergoes dehydrogenation to form octene, significantly reducing the activation energy required for C-C bond cleavage. This approach enhances the yield and selectivity of light olefins. When mixing ratio of dehydrogenation catalyst in tandem catalysis is 5%, the conversion reaches 90.07%, and the total light olefins yield is 47.90%. The influence of factors such as reaction temperature, coupling mode and mixing ratio were also demonstrated. Comparing to standalone zeolites, 15% higher olefin yields were obtained with tandem mixed catalysts, demonstrating the excellent dehydrogenation cracking ability. The optimized dehydrogenation temperature at 450 °C, could provide an optimal reaction environment for this elementary dehydrogenation reaction and decrease the energy consumption. Synergetic effect of zeolite-based catalyst with different mixing ratio of CaMnO@NaWO also leads to tunable P/E ratio. Theoretical calculations of reaction routes provided valuable insights for the further development and optimization of naphtha conversion processes.
蒸汽裂解过程中巨大的能源消耗和高二氧化碳排放推动了对石脑油制轻质烯烃替代方法的探索。在此背景下，我们提出了一种新型的脱氢裂解方法作为石脑油转化的替代路线。通过使用基于钙钛矿的氧化还原催化剂CaMnO@NaWO，并结合基于沸石的催化剂，模型化合物辛烷发生脱氢反应生成辛烯，显著降低了碳-碳键断裂所需的活化能。这种方法提高了轻质烯烃的产率和选择性。当串联催化中脱氢催化剂的混合比例为5%时，转化率达到90.07%，轻质烯烃总产率为47.90%。还展示了反应温度、耦合模式和混合比例等因素的影响。与单独的沸石相比，串联混合催化剂的烯烃产率提高了15%，证明了其优异的脱氢裂解能力。优化的脱氢温度为450℃，可为这一基本脱氢反应提供最佳反应环境并降低能耗。不同混合比例的CaMnO@NaWO与基于沸石的催化剂的协同效应也导致了可调的P/E比。反应路线的理论计算为石脑油转化过程的进一步发展和优化提供了有价值的见解。
