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  4. Reaction Mechanism and Deactivation Modes of Heterogeneous Catalytic Systems

催化学报 , 2011, 32(3): 387-404. doi: 10.1016/S1872-2067(10)60181-7

Reaction Mechanism and Deactivation Modes of Heterogeneous Catalytic Systems

1, , 2, , 3, , 4,

1.Institute of Catalysis, Bulgarian Academy of Sciences, Sofia, Bulgaria

2.SABIC Chair of Catalysis, King Abdulaziz University, Jeddah, Saudi Arabia

3.SABIC Chair of Catalysis, King Abdulaziz University, Jeddah, Saudi Arabia

4.SABIC Chair of Catalysis, King Abdulaziz University, Jeddah, Saudi Arabia

Reaction Mechanism and Deactivation Modes of Heterogeneous Catalytic Systems

K.KUMBILIEVA 1, , L.PETROV 2, , Y.ALHAMED 3, , A.ALZAHRANI 4,

1.Institute of Catalysis, Bulgarian Academy of Sciences, Sofia, Bulgaria

2.SABIC Chair of Catalysis, King Abdulaziz University, Jeddah, Saudi Arabia

3.SABIC Chair of Catalysis, King Abdulaziz University, Jeddah, Saudi Arabia

4.SABIC Chair of Catalysis, King Abdulaziz University, Jeddah, Saudi Arabia

Keywords： catalyst activity

Solving the problem of catalyst deactivation is essential in process design. To do this, various aspects of the kinetics of processes with catalyst deactivation, and their different mechanisms, are discussed. Catalyst deactivation often cannot be avoided, but more knowledge on its mechanism can help to find kinetic means to reduce its harmful consequences. When deactivation is caused by coke, the generation of coke precursors is the determining step in the deactivation kinetics. Different types of deactivation were distinguished that lead to different evolution of the process. The phenomenon of non-uniform coking can be linked to catalyst surface non-uniformity. For the class of catalysts with more than one type of active sites, an explanation was suggested for the observed trends in the deactivation modes. For catalytic processes using catalyst panicles of industrial size, the influence of intraparticle diffusion resistance is important. The analysis showed that for a number of processes, the decrease of the reaction rate due to deactivation is less under diffusion control. For certain reaction mechanisms,there exist operation conditions where the rate of the process under diffusion control exceeds the rate in the kinetic control regime. A significant problem is the change of selectivity in the course of catalyst deactivation. The selectivity may either decrease or increase, and depends on the reaction mechanism during deactivation. The changes are larger when there is no diffusion resistance. The intentional poisoning of catalysts and its influence on catalyst activity and selectivity for the process of ethylene oxide production was discussed.

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