✦ LIBER ✦

Tests for absence of intraparticle diffusion effects in branched-pore systems

✍ Scribed by Lee F. Brown

Publisher: Elsevier Science
Year: 1972
Tongue: English
Weight: 606 KB
Volume: 27
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(72)85058-9

No coin nor oath required. For personal study only.

✦ Synopsis

Tests which have been recommended for detecting the presence or absence of mass transport in continuous-pore systems are considered for their applicability in branched-pore systems. When diffusion effects are absent in the primary pore system, three of the tests-the Weisz-Prater-Bischoff criterion, Hudgins' approach, and the Stewart-Villadsen criteria-can be used to show the presence or absence of these effects in the secondary system. In addition, two upper bounds are derived for the quotient of the secondary system Thiele modulus divided by the primary system modulus. These bounds can also be used for showing the absence of mass transport effects in the secondary pore system whenever the primary pore system is unaffected. Application of this latter development to porous materials suggests that if the primary pore system is unaffected by mass transport, then the secondary system is also unaffected, except under abnormal circumstances.

📜 SIMILAR VOLUMES

A simple test for evaluating the truncat

A simple test for evaluating the truncation effects in simulations of systems involving charged groups

✍ Pascal Auffinger; David L. Beveridge 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 232 KB

We report the results from a molecular dynamics (MD) simulation on a 1.0 M aqueous NaCI solution using the classical SPC water model and a treatment of long-range electrostatic forces involving a 9-16 A twin-range cut-off. This study was undertaken to explore the importance of truncation effects in

An integral equation method for evaluati

An integral equation method for evaluating the effects of film and pore diffusion of heat and mass on reaction rates in porous catalyst particles

✍ Arthur S. Kesten 📂 Article 📅 1969 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 403 KB 👁 2 views

The isotope effect for diffusion in the

The isotope effect for diffusion in the Cr-Ni system: Criticism of a paper by Heumann and Reerink

✍ A.D. Le Claire 📂 Article 📅 1967 🏛 Elsevier Science ⚖ 239 KB

Heumann and Reerinko) have recently reported 4-measurements of the isotope effect E for Cr diffusion in Ni.

Effective Charge Separation in Intermole

Effective Charge Separation in Intermolecular Complexes of an Electron Donor and a Doubly Branched Triad Assembly: A Model System for Environmental Effects Controlling Electron Transfer

✍ Eran Zahavy; Martin Seiler; Sharon Marx-Tibbon; Ernesto Joselevich; Prof. Itamar 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 444 KB 👁 2 views

On imperfect contacting in batch heterog

On imperfect contacting in batch heterogeneous chemical reaction systems—II. The effective scalar diffusion coefficient for a class of multicomponent chemical networks

✍ A.E. de Gance; L.E. Johns 📂 Article 📅 1974 🏛 Elsevier Science 🌐 English ⚖ 592 KB

For a certain simple class of chemical reaction networks, viz. rank E = 1, the introduction of an effective scalar diffusion coefficient allows the vector integro-differential equation describing the performance of a multicomponent batch heterogeneous chemical reaction system to be reduced to the sc

Effectiveness of testing for anti-dna an

Effectiveness of testing for anti-dna and the complement components ic3b, bb, and c4 in the assessment of activity of systemic lupus erythematosus

✍ John D. Clough; Rose K. Chang 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 597 KB

Seventy-one patients with systemic lupus erythematosus (SLE), seen in an outpatient setting for follow-up evaluation during a 3-mo period, were tested (in addition to routine lupus monitoring studies) with enzyme immunoassays (EIAs) for anti-DNA, iC3b, and factor Bb to determine the relationship of