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New mixed lanthanum- and alkaline-earth cation-containing basic catalysts obtained by an alginate route

Paper ID Volume ID Publish Year Pages File Format Full-Text
55357 47049 2012 7 PDF Available
Title
New mixed lanthanum- and alkaline-earth cation-containing basic catalysts obtained by an alginate route
Abstract

A new route using mixed ionotropic gels of the natural block copolymer alginate as precursor has been used for the preparation of basic catalysts. Gelification of the alginate has been performed with lanthanum which has been then exchanged by a second alkaline-earth cation. The amount of both type of cations was controlled by the pre-determined relative affinity of the lanthanum containing hydrogels for the alkaline-earth cations which trend is as follows: Ba2+ > Sr2+ > Ca2+ > Mg2+. The surface areas of the materials obtained after thermal decomposition of the ex-alginate samples dried under supercritical CO2 conditions are greatly improved compared to samples with similar composition obtained by coprecipitation.The catalytic test reaction of 2-Methylbut-3-yn-2-ol decomposition reveals the basic properties of the ex-alginate samples. They range as follows in function of the alkaline-earth cation: Mg > Ba > Sr > Ca. This emphasizes the very attractive properties of the Mg-containing catalysts obtained through the alginate route due to their high basic strength and surface areas.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (367 K)Download as PowerPoint slideHighlights► Mixed ionotropic gels of alginate were used as precursors of basic catalysts. ► Preparation of La3+ and M2+ containing materials (M2+ = Mg2+, Ca2+, Sr2+, Ba2+). ► Surface areas of ex-alginates improved compared to coprecipitated materials. ► High basicity proved by the 2-methylbut-3-yn-2-ol catalytic test.

Keywords
Alginates; Base-type catalysts; 2-Methylbut-3-yn-2-ol; Alkaline-earth cations; Lanthanum; Aerogels
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New mixed lanthanum- and alkaline-earth cation-containing basic catalysts obtained by an alginate route
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 189, Issue 1, 30 July 2012, Pages 28–34
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us