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Deactivation of supported nickel catalysts during CO methanation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39440 45823 2014 7 PDF Available
Title
Deactivation of supported nickel catalysts during CO methanation
Abstract

Deactivation of Ni-based catalysts was investigated during CO methanation over different supported catalysts. X-ray diffraction and temperature-programmed hydrogenation analyses were used to investigate nickel particle sintering and carbon formation during the first 24 h on stream. Titania-supported catalysts presented high resistance towards carbon deposition and nickel particle growth in comparison with the other tested catalysts. Particle size effects on these two deactivation causes were also evaluated. It was shown that carbon formation rates are higher on bigger crystal particles. However, it was found that titania-supported nickel catalysts reduced at high temperatures show the opposite effect. This difference is most probably due to a stronger interaction between nickel and TiOx (x < 2) species on smaller crystals which changes the CO dissociation properties and, in consequence, carbon formation rates.

Keywords
Methanation; Deactivation; Support; Titania; Carbon formation
First Page Preview
Deactivation of supported nickel catalysts during CO methanation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 486, 22 September 2014, Pages 143–149
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis