fulltext.study @t Gmail

Promoted RhPt bimetallic catalyst supported on δ-Al2O3 and CeO2–ZrO2 during full-scale autothermal reforming for automotive applications: Post-mortem characterization

Paper ID Volume ID Publish Year Pages File Format Full-Text
39321 45818 2015 9 PDF Available
Title
Promoted RhPt bimetallic catalyst supported on δ-Al2O3 and CeO2–ZrO2 during full-scale autothermal reforming for automotive applications: Post-mortem characterization
Abstract

•Mesoporosity:CAT1 > CAT 2. Enhances conversion of heavy hydrocarbons and selectivity.•Heavy HC were mostly converted at the front of CAT 1. Large coke deposition at CAT 1M•Encapsulation of active sites in CAT 1 is more significant than in CAT 2•S-poisoning is significant in CAT 2, S-capacity is reduced by loss of surface area.•The highest θs after 40 h was 0.15, which is below the RhPt sulfur capacity, ∼ 0.19.

The influence of sulfur and coke formation on the steam reforming of diesel was evaluated for two promoted RhPt bimetallic catalysts, composed of 1:1 Rh:Pt/10:10 La2O3: CeO2/ δ-Al2O3 (CAT 1) and 1:1 Rh:Pt/4:5 MgO: Y2O3/CeO2 − ZrO2 (CAT 2). The intrinsic activity is related to the total Rh and Pt area observed after the exposure to sulfur. Therefore, the degree of deactivation is related to the amount of sulfur deposited on the active metal sites. Sulfur analysis on the aged catalyst washcoat showed a decreasing sulfur concentration in the axial direction of the reformer. The estimated sulfur coverage related to metal surface area after 40 h on stream reached values of 0.145 in CAT 2, below the equilibrated sulfur coverage of 0.19 after tests with DIN 590. Thus, showing a partial deactivation due to sulfur poisoning. Further catalyst characterization on carbon deposits and thermal aging was performed by TPO, TGA, BET, CO chemisorption, and TEM analysis.

Graphical abstractSpent catalyst after 40 h on stream. Aged washcoat samples taken at the poited locations. F: front, M: middle, B: back.Figure optionsDownload full-size imageDownload high-quality image (157 K)Download as PowerPoint slide

Keywords
ATR; Infrastructure fuel; Sulfur; Deactivation; RhPt bimetallic catalysts
First Page Preview
Promoted RhPt bimetallic catalyst supported on δ-Al2O3 and CeO2–ZrO2 during full-scale autothermal reforming for automotive applications: Post-mortem characterization
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 491, 5 February 2015, Pages 8–16
Authors
, , , ,
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