Rate Parameters in Heterogeneous Catalysis by Pulse Techniques
Title:
Rate Parameters in Heterogeneous Catalysis by Pulse Techniques
Author:
Furusawa, Takehiko Suzuki, Motoyuki Smith, J. M.
Appeared in:
Catalysis reviews
Paging:
Volume 13 (1976) nr. 1 pages 43-76
Year:
1976
Contents:
Response to perturbations of concentration and temperature have been used since the early part of the century [l, 21 to describe mathematically the transient behavior of process equipment. Beginning two decades ago [3, 41, evaluation of rate parameters, such as mass transfer coefficients, diffusivities, and chemical kinetic constants from response measurements, has developed into a useful tool in applied science. Kubin [5, 61 and Kucera [7] made a major contribution in pointing out that experimentally measurable moments of the response curves (peaks) to pulse inputs could be expressed explicitly in terms of the rate and equilibrium parameters used to describe the chemical and physical processes occurring in the equipment, For example, in a fixed-bed, continuously operating adsorber the moments of the response peak, in the effluent stream, to a pulse of concentration introduced in the feed could be expressed in terms of an axial dispersion rate coefficient, fluid-to-particle mass transfer coefficient, intraparticle diffusivity, and adsorption rate and equilibrium constants at an interior site in the adsorbent particles.