fulltext.study @t Gmail

Toward bifunctional catalysts for the direct conversion of syngas to gasoline range hydrocarbons: H-ZSM-5 coated Co versus H-ZSM-5 supported Co

Paper ID Volume ID Publish Year Pages File Format Full-Text
40514 45857 2013 12 PDF Available
Title
Toward bifunctional catalysts for the direct conversion of syngas to gasoline range hydrocarbons: H-ZSM-5 coated Co versus H-ZSM-5 supported Co
Abstract

One step production of gasoline range hydrocarbons from syngas is demonstrated by combination of Fischer–Tropsch synthesis (FTS) and acid functionalities in one single bifunctional catalyst particle. Two different catalyst configurations were studied in which the acid functionality of H-ZSM-5 zeolite conjoins the cobalt FTS active phase: (i) H-ZSM-5 as catalytic coating on Co and (ii) H-ZSM-5 as catalytic support for Co. Spherical shaped Co/SiO2 was chosen as a conventional FTS catalyst for comparison and used as precursor to synthesize the H-ZSM-5 coated Co catalyst. Various Silicalite-1 and H-ZSM-5 coated reference samples were prepared by subjecting Co/SiO2 to a direct hydrothermal procedure. Thorough characterization and catalytic performance tests reveal that direct hydrothermal synthesis results in transformation of SiO2 from the Co/SiO2 particles into an MFI coating of Co agglomerates. The silica support does not only act as precursor but also as nano-mold during the preparation of the zeolite coated catalysts as the original Co/SiO2 particle shape is preserved. The close vicinity of the acid sites and Co function in the zeolite coated catalysts promotes the acid catalyzed conversion of the produced FTS hydrocarbons and reduces the production of C12+. Alternatively, mesostructured H-ZSM-5 was used to support Co. Mesoporous hierarchy in the latter case improves both the Co dispersion and the proximity of FTS and acid sites. Thus, Co supported on mesoporous H-ZSM-5 is a much more effective catalyst for the direct production of gasoline range hydrocarbons than the H-ZSM-5 coated Co catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (439 K)Download as PowerPoint slideHighlights► One-step production of gasoline range hydrocarbons from syngas using bi-functional catalysts. ► Combination of zeolites and Co nanoparticles breaks ASF distribution. ► Close vicinity of zeolitic acid sites and Co is crucial. ► Co supported on mesoporous H-ZSM-5 more effective than Co coated with ZSM-5 catalysts.

Keywords
Fischer–Tropsch; Bifunctional catalyst; H-ZSM-5; Cobalt; Mesoporous zeolite; Coating; Selectivity control
First Page Preview
Toward bifunctional catalysts for the direct conversion of syngas to gasoline range hydrocarbons: H-ZSM-5 coated Co versus H-ZSM-5 supported Co
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 456, 10 April 2013, Pages 11–22
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