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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Interpretation of the mechanism diffusion in the gas-solid process of the dessulfurization reaction

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Author(s):
Mortari, Daniela Andresa [1] ; Crnkovic, Paula Manoel ; Ávila, Ivonete [3] ; Milioli, Fernando Eduardo
Total Authors: 4
Affiliation:
[1] Universidade de São Paulo (USP). Escola de Engenharia de São Carlos - Brasil
[3] Universidade de São Paulo (USP). Escola de Engenharia de São Carlos - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Química Nova; v. 33, n. 9, p. 1887-1891, 2010.
Field of knowledge: Engineering - Chemical Engineering
Abstract

The present paper aims to interpret the SO2 diffusion mechanism process for two different limestones: a calcite and a dolomite. In previous study, the apparent activation energies for sulfation reaction were between 3.03 and 4.45 kJ mol-1 for the calcite, and 11.24 kJ mol-1 for the dolomite. Using nitrogen porosimetry it was possible to observe that the dolomite presents mesopores of 0.03 um, while the calcite presents mesopores of 0.01 um. The evaluation of limestones porous structure together with their kinetic parameters, allowed concluding that the diffusion mechanism follows Fick law and Knudsen law for dolomite and calcite, respectively. (AU)

FAPESP's process: 08/07215-4 - The physical structure of limestones and the reactivity as sorbents of atmospheric pollutant
Grantee:Daniela Andresa Mortari
Support type: Scholarships in Brazil - Master