fulltext.study @t Gmail

The effect of Fe on Pt particle states in Pt/KL catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
39211 45813 2015 7 PDF Available
Title
The effect of Fe on Pt particle states in Pt/KL catalysts
Abstract

•Two types of Fe-promoted Pt/KL catalysts were studied.•Framework Fe and non-framework Fe were introduced by different methods.•With the non-framework Fe, an electron-rich platinum species formed.•With the framework Fe, an electron-deficient platinum species formed.•Fe species affected the catalyst aromatization performance.

Two types of Fe-containing Pt/KL catalysts were prepared, characterized and examined using an n-hexane aromatization reaction. Pt/FeKL contained framework Fe, which was incorporated through hydrothermal synthesis, while Pt-Fe/KL contained non-framework Fe, which was introduced through impregnation. The differences between the framework and non-framework Fe were examined using XRD, FT-IR and Mössbauer spectroscopy. Pt dispersion and reducibility as well as the electronic states of the Fe and Pt particles were detected using H2-chemisorption, H2-TPR and XPS, respectively. With the non-framework Fe, an electron-rich platinum species (Ptδ−) formed after reduction. With the framework Fe, an electron-deficient platinum species (Ptδ+) was detected. The n-hexane aromatization results from adding 0.3 wt% non-framework Fe include conversion after 3.5 h on stream at 450 °C, H2/n-hexane = 3.0 (mole ratio) and 3 h−1 WHSV over the Pt-Fe/KL, which was maintained at 77%; these values are greater than the 41% Pt/KL and 25% Pt/FeKL. The Pt-Fe/KL benzene selectivity was 89%, which is also greater than the 83% Pt/KL and 53% Pt/FeKL. We discuss the effect of Fe on the Pt particle states and the relationship between the Pt states and catalyst activity.

Graphical abstractWith 0.3 wt% non-framework Fe added in the Pt/KL catalyst, electron-rich platinum specie (Ptδ−) was detected after reduction. With framework Fe incorporated in Pt/KL catalyst, electron-deficient platinum specie (Ptδ+) appeared. The order of aromatic activity and benzene selectivity for n-hexane aromatization, Pt-Fe/KL > Pt/KL > Pt/FeKL, was consistent with the catalysts’ Pt particle electron density.Figure optionsDownload full-size imageDownload high-quality image (130 K)Download as PowerPoint slide

Keywords
Fe-containing; Pt/KL; Pt states
First Page Preview
The effect of Fe on Pt particle states in Pt/KL catalysts
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 492, 25 February 2015, Pages 31–37
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