By Massimo Morbidelli
Considering heterogeneous catalysis is usual in chemical, refinery, and pollution-control approaches, reaching optimum catalytic functionality is an important factor for chemical engineers and chemists. This publication addresses the query of ways catalytic fabric could be allotted within a porous help to procure optimum functionality. It treats unmarried and a number of response structures, isothermal and nonisothermal stipulations, pellets, monoliths, fixed-bed reactors, and membrane reactors. the consequences of physicochemical and working parameters are analyzed to realize perception into the underlying phenomena governing the functionality of optimally designed catalysts. all through, the authors provide a balanced remedy of thought and scan and pressure difficulties of business value.
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Extra resources for Catalyst Design: Optimal Distribution of Catalyst in Pellets, Reactors, and Membranes (Cambridge Series in Chemical Engineering)
1991) further investigated this model using a different numerical technique and revealed more complex dynamic behavior. The effect of deactivation on the dynamics of Dirac pellets was also investigated. It was found that the decrease of catalyst activity during deactivation has similar consequences to the decrease of Thiele modulus for nondeactivating catalysts (Brunovska, 1987). 11) where only one stable steady state exists, due to deactivation the region of periodic oscillations is reached. As deactivation continues, oscillations die out and a region of unique stable steady states is attained again, to the right of point C.
Effectiveness factor η of a pellet with a given Dirac-delta activity distribution as a function of the Thiele modulus φ. 03, γ = 20, ε = 0, σ = 20. ) in the operating φ can cause a catastrophic decrease in the effectiveness factor. 56, giving a somewhat lower effectiveness factor on the upper branch, but for which any small deviations from the operating φ on either side do not cause a large deviation in the obtained effectiveness factor. This result is similar to that discussed previously in the context of an isothermal reaction (cf.
It was shown that the selectivity to ethylene oxide is maximized when the catalyst is located at the external surface of the pellet. This is expected for parallel exothermic reactions with similar kinetics when the undesired reaction has a higher activation energy than the desired one. The maximum selectivity is attained at the surface of the pellet, even if combustion of ethylene oxide is included (Pavlou and Vayenas, 1990a). However, if the net production rate of ethylene oxide is to be maximized, then subsurface locations are optimal, a fact which arises from the nonisothermality of the pellet.
Catalyst Design: Optimal Distribution of Catalyst in Pellets, Reactors, and Membranes (Cambridge Series in Chemical Engineering) by Massimo Morbidelli
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