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Structure of Real Catalysts

Real heterogeneous catalysts are complex structures typically consisting of several phases. Usually, only one phase is catalytically active, but there are exceptions for example, one phase may catalyze one part of the total reaction, whereas different phase catalyzes another or the active site is at the boundary between two phases. The active phase usually consists of nanosized particles or is nanoslructured in some other way in order to have a large surface area (Fig. 9.1). [Pg.138]

In other cases, a structural promoter is added to keep the nanoparticles of the active phase from sintering together and forming larger particles with a low surface area, hi the Fe-based ammonia catalysts used in industry today, Al Oj is added to stabilize the Fe particles. [Pg.138]

Fundamental Concepts in Heterogeneous Catalysis, First Edition. Jens K. N0rskov, Felix Studt, Frank Abild-Pedersen and Thomas Bligaard. [Pg.138]


See other pages where Structure of Real Catalysts is mentioned: [Pg.135]    [Pg.138]   


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