CO2 Sorption on hydrotalcite and alkali modified (K and Cs) hydrotalcites at high temperatures

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Eduardo L. G. Oliveira (Author) FEUP; Carlos A. Grande (Author) FEUP; Alírio E. Rodrigues (Author) FEUP

Journal

Title: Separation and Purification Technology

Vol. 62 No. 1

Pages: 137-147

ISSN: 1383-5866

Publisher: Elsevier

Indexing

ISI Proceedings

ISI Web of Knowledge - 113 Citations

ISI Web of Science

Scopus - 102 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-003-XM4

DOI: 10.1016/j.seppur.2008.01.011

Abstract (EN): The concept of in situ removal and capture of CO2 at high temperature using a sorbent for sorption-enhanced reaction processes (SERP) is an area where improvements of sorptive materials are required. The aim of this work is the development of a suitable adsorbent to be employed at temperatures above 573 K in SERP processes for hydrogen production from methane steam reforming. sorption of carbon dioxide was studied in three commercial hydrotalcites with different Mg/Al ratio. To study the effect of impregnation with two alkali metals, the three hydrotalcites were impregnated with cesium and potassium and a sorbent screening was performed. The novelty of this work was the determination of carbon dioxide sorption equilibrium isotherms at 579, 676 and 783 K on two samples, one modified with potassium carbonate and other with cesium carbonate. The alkali-modified samples showed a maximum loading at 676 K being MG30-K the one with highest capacity (0.76 mol/kg wet basis at 0.40 bar of CO2 partial pressure). A study of the cyclic stability of this material was performed, showing that there was only small loss of capacity after 75 sorption/desorption cycles. (c) 2008 Elsevier B.V. All rights reserved.

Language: English

Type (Professor's evaluation): Scientific