Adsorption of small molecules on alkali-earth modified titanosilicates

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Simone Cavenati (Author) FEUP; Carlos A. Grande (Author) FEUP; Filipe V.S. Lopes (Author) FEUP; Alírio E. Rodrigues (Author) FEUP

Journal

Title: Microporous and Mesoporous Materials

Pages: 114-120

ISSN: 1387-1811

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

ISI Web of Science

Scopus - 18 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-003-KHY

DOI: 10.1016/j.micromeso.2009.01.012

Abstract (EN): Removal of nitrogen from methane-rich streams is one of the most energy-intensive gas separations. Nitrogen rejection units are very expensive units and in streams with small and intermediate flowrates, adsorption technologies proved to be an economic alternative, if N-2 is selectively adsorbed in the adsorbent. In this work we have synthesized sodium titanosilicate (Na-ETS-4) and study the effect of exchanging Na with different alkali-earth cations in the structure, namely Sr and Ca. Adsorption equilibrium of CH4 and N-2 and CO2 were measured at 323 K in all the samples. The effect of different activation temperatures was studied in the modified samples. It was observed that activating the adsorbent at high temperatures prior to adsorption tests, the capacity of methane can be reduced. In the Ca-ETS-4 a shift in selectivity was observed: activating the adsorbent at higher temperatures result in an adsorbent with higher selectivity towards nitrogen. In all the samples tested, the loading of carbon dioxide is much higher than the loading of other gases indicating that this gas should be removed from the stream before nitrogen rejection.

Language: English

Type (Professor's evaluation): Scientific