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Experimental and exergy evaluation of ethanol catalytic steam reforming in a membrane reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
53337 46963 2016 11 PDF Available
Title
Experimental and exergy evaluation of ethanol catalytic steam reforming in a membrane reactor
Abstract

•Ethanol steam reforming experiments were performed in a membrane reactor.•Hydrogen yield of 0.55 and hydrogen recovery of 92% were reached.•0.9 lN pure hydrogen per ml of converted ethanol was produced.•Exergy efficiency up to 50% was reached in the case of an insulated reactor.•The system is optimized by reactor insulation and retentate gas exergy recovery.

The application of exergy analysis in the evaluation of the ethanol steam reforming (ESR) process in a catalytic membrane reactor (CMR) was presented. ESR experiments were performed at T = 873–923 K and P = 4–12 bar in a CMR containing Pd–Ag membranes sandwiched by Pd–Rh/CeO2 catalyst, aiming to produce fuel cell grade pure hydrogen. The effect of the operating conditions on the pure hydrogen production rate, hydrogen yield and recovery, exergy efficiency, and thermodynamic losses was investigated. Total hydrogen yield of 3.5 mol H2 permeated per mol ethanol in feed with maximum hydrogen recuperation of 90% was measured at 923 K and 12 bar. The highest amount of exergy was destructed via heat losses and the retentate gas stream. Exergy efficiency up to around 50% was reached in the case of the insulated reactor at 12 bar and 923 K. Exergy efficiency placed between 70–90% in the case of recovery of the retentate gas in an insulated reactor. It was concluded that operating at the highest pressure, the lowest S/C ratio, and 923 K gives the best exergy efficiency.

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Keywords
Exergy; Hydrogen; Catalytic membrane reactor; Ethanol steam reforming
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Experimental and exergy evaluation of ethanol catalytic steam reforming in a membrane reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 268, 15 June 2016, Pages 68–78
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