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Catalytic Cracking of n-Decane over Monometallic and Bimetallic Pt–Ni/MoO₃/La–Al₂O₃ Catalysts: Correlations of Surface Properties and Catalytic Behaviors

Zhang, Jun, Chen, Ting, Yao, Peng, Jiao, Yi, Wang, Jianli, Chen, Yaoqiang, Zhu, Quan, Li, Xiangyuan
Industrial & engineering chemistry process design and development 2019 v.58 no.5 pp. 1823-1833
X-ray diffraction, X-ray photoelectron spectroscopy, acidity, ammonia, carbon monoxide, catalysts, catalytic activity, catalytic cracking, cracking, desorption, energy-dispersive X-ray analysis, hydrogen, nickel, process design, synergism, thermal stability, transmission electron microscopy
Catalytic cracking of n-decane was performed over monometallic and bimetallic Pt–Ni catalyst supported La–Al₂O₃ modified by MoO₃ (MLA), aiming to investigate the effects of acidity, active phase dispersion, and synergistic effect between Pt and Ni on catalytic performance of the catalysts. The catalysts were characterized by the techniques of Brunauer–Emmett–Teller (BET), hydrogen temperature-programmed reduction (H₂-TPR), X-ray diffraction (XRD), temperature-programmed desorption of ammonia (NH₃-TPD), X-ray photoelectron spectroscopy (XPS), CO chemisorption, and transmission electron microscopy/energy-dispersive spectroscopy (TEM/EDS) mapping. The results showed that catalytic cracking activities over catalysts were heightened compared with MLA, especially bimetallic catalyst. Meanwhile, bimetallic catalyst exhibited the best high-temperature stability. Otherwise, cracking activity over regenerative bimetallic catalyst nearly approached that of the fresh one. The most effective findings of properties of bimetallic catalyst presented as follows: the unique acidity, higher resistance against sintering of active phases, and finely dispersed actives due to enhanced metal–support interaction and synergistic effect between Pt and Ni can be responsible for its stable catalytic activity and thermal stability, and capable regeneration.