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Activation of Mo-based catalyst for paraffins isomerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
44121 46004 2007 8 PDF Available
Title
Activation of Mo-based catalyst for paraffins isomerization
Abstract

Activation procedures of Mo-based catalysts were investigated in terms of their activity in reaction of n-hexane isomerization. Temperature programmed activation and oxidation (TPA/TPO) in different gaseous environments were used to correlate catalyst activity/selectivity properties with the nature of active phases and with activation procedures required for their formation. A beneficial activation procedure giving Mo-oxycarbide comprises very low ramping temperature of 1 °C/min, 550 °C as the final temperature and a flow of methane and hydrogen with a preferable ratio 1:4. In addition, some minimal time for keeping both initial and final temperature constant is required, indicating benefit of both periods of initialization and active phase slow aging. Neither different diluent (He) nor other gas as a C-source (CO, n-hexane) gives an active catalyst. The catalyst activity can be enhanced by exposing it to air at room temperature, and decayed in the same environment at 300 °C.

Graphical abstractActivation procedures of Mo-based catalysts were investigated in terms of their activity in reaction of n-hexane isomerization. Temperature programmed activation and oxidation (TPA/TPO) in different gaseous environments were used to correlate catalyst activity/selectivity properties with the nature of active phases and with activation procedures required for their formation. A beneficial activation procedure giving Mo-oxycarbide comprises very low ramping temperature of 1 °C/min, 550 °C as the final temperature and a flow of methane and hydrogen with a preferable ratio 1:4.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mo-based catalysts; Activation; n-Hexane isomerization; Activity–structure correlations
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Activation of Mo-based catalyst for paraffins isomerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 317, Issue 2, 7 February 2007, Pages 175–182
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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