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TiO2-supported catalysts for the steam reforming of ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
39706 45832 2014 12 PDF Available
Title
TiO2-supported catalysts for the steam reforming of ethanol
Abstract

•TiO2 in different crystal structure, differently disperses the active phase and affects Ni/support interaction.•Tunable metal–support interaction through different calcination temperature affects catalyst performance.•Ni is more active than Co and Cu for the low temperature steam reforming of ethanol.

TiO2 was used as support for Ni, Co and Cu to prepare catalysts for the steam reforming of ethanol, due to its known tendency to form strong metal–support interaction (SMSI) with some metals. The samples were prepared following different procedures, tuning the reducibility of the active phase and its interaction with the support. The latter parameter showed pivotal to impart suitable catalytic activity and most of all stability towards coking. Indeed, the insurgence of SMSI may allow to keep the active phase dispersed, improving activity and inhibiting the formation of carbon filaments over the active phase.The comparison between different active phases (Ni, Co, Cu, 10 wt%) confirmed Ni as very active, although it has a higher tendency to form carbon filaments. This drawback may be at least partially controlled by favouring high Ni dispersion through the formation of a mixed oxide with the support. The calcination temperature, and in general the preparation procedure for the catalyst, showed of pivotal importance to establish SMSI. In particular, calcination at relatively low temperature (i.e. 500 °C) induced initially a higher dispersion of the active phase (mean Ni crystal size 7 nm), however not accompanied by sufficient stabilisation during activity testing (mean Ni crystal size increased to 44 nm). By contrast, calcination at higher temperature (i.e. 800 °C) favoured the instauration of a SMSI and the formation of a mixed oxide (NiTiO3), which, after activation, allowed the coexistence of smaller particles, more active and resistant to deactivation and sintering, together with the more sintered ones (mean Ni crystal size 27 nm before and after activity testing). Different characterisation data (XRD, FT-IR, TPR, TEM) allowed to conclude the need of calcination at high temperature to achieve sufficient activity and resistance of the catalyst for this application.Co and Cu proved more promising as for C balance, although their activity at low temperature was unsatisfactory, mainly due to poor activity for CC bond cleavage.The characterisation of the spent catalysts by XRD, TEM and Raman allowed to evidence the different types of C deposed and to check for active phase stability against sintering.

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Keywords
Ethanol steam reforming; Nickel catalyst; Cobalt catalyst; Copper catalyst; Titania; Metal–support interaction
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TiO2-supported catalysts for the steam reforming of ethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 477, 5 May 2014, Pages 42–53
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