The single-pellet reactor, in which in effect the reactant concentration at the center-plane of a porous catalyst pellet of slab geometry can be measured, can provide information on the concentration dependence of self-poisoning rates of heterogeneously catalyzed reactions. The method is illustrated
Poisoning studies in a single pellet reactor
β Scribed by J.R. Balder; E.E. Petersen
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 370 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0009-2509
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β¦ Synopsis
An expenmental techmque has been developed to differentlate between umform polsonmg and pore-mouth polsomng of porous catalysts for a first-order reactlon Data for the hydrogenolysls of cyclopropane on an alumma-supported platmum catalyst dunng polsomng mdlcated that the polsonmg mechamsm was between the two hmltmg cases
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π SIMILAR VOLUMES
We,,, modified Weber number Greek symbols NOTATION dimensionless circulation number as defined in Eq. (7) equivalent diameter as defined in Eq. (6) cm internal nozzle diameter, cm Halligan and Burkhart dimensionless Weber c De4 D, F number h drop height at time t, from nozzle exit to drop apex k m n
## Abshct -A theoretical analysis of an adiabatic non-isothermal single-pellet diffusion reactor shows that nonisothermal effects can alter the value of the centerplane concentration. Deviation from isothermal behavior is significant under exothermic conditions where multiplicity of solutions can
Non-catalwc gas-sobd reactions are unportant m many matenal pmcessmg and chemtcsl mdustrtes Such reachons call for specud attentton today regardmg the coal gasdication processes hvlng the past fifteen years, a number of papers on gas-sohd reachons has appeared m the hterature Recently Szekely et al
For rapid reactions the differences in local coefficients of heat and mass transfer around the surface of a catalyst particle lead to a distribution of surface temperatures and an asymmetric internal profile. The nature of these distributions and their changes with flow rate were predicted for the h