Passivation of Co/Al2O3 Catalyst by Atomic Layer Deposition to Reduce Deactivation in the Fischer–Tropsch Synthesis

Catalysts

José Antonio Díaz-López¹  Jordi Guilera¹  Martí Biset-Peiró¹  Teresa Andreu¹  Dan Enache²  Gordon Kelly² 

[1] Catalonia Institute for Energy Research (IREC), Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besòs, Spain;Johnson Matthey, Belasis Avenue, Stockton-on-Tees, Billingham TS23 1LH, UK;

关键词: Fischer–Tropsch;    atomic layer deposition;    deactivation;    synthetic fuels;    cobalt catalyst;    passivation;   

DOI  :  10.3390/catal11060732

来源: DOAJ

【 摘 要 】

The present work explores the technical feasibility of passivating a Co/γ-Al₂O₃ catalyst by atomic layer deposition (ALD) to reduce deactivation rate during Fischer–Tropsch synthesis (FTS). Three samples of the reference catalyst were passivated using different numbers of ALD cycles (3, 6 and 10). Characterization results revealed that a shell of the passivating agent (Al₂O₃) grew around catalyst particles. This shell did not affect the properties of passivated samples below 10 cycles, in which catalyst reduction was hindered. Catalytic tests at 50% CO conversion evidenced that 3 and 6 ALD cycles increased catalyst stability without significantly affecting the catalytic performance, whereas 10 cycles caused blockage of the active phase that led to a strong decrease of catalytic activity. Catalyst deactivation modelling and tests at 60% CO conversion served to conclude that 3 to 6 ALD cycles reduced Co/γ-Al₂O₃ deactivation, so that the technical feasibility of this technique was proven in FTS.

【 授权许可】

Unknown