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Surface impregnation combustion method to prepare nanostructured metallic catalysts without further reduction: As-burnt Cu–ZnO/SiO2 catalyst for low-temperature methanol synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
55501 47056 2012 7 PDF Available
Title
Surface impregnation combustion method to prepare nanostructured metallic catalysts without further reduction: As-burnt Cu–ZnO/SiO2 catalyst for low-temperature methanol synthesis
Abstract

Nanostructured metallic catalysts (Cu/ZnO and Cu–ZnO/SiO2) were prepared by sol–gel auto-combustion method and a novel surface impregnation combustion method in the argon atmosphere, using metal nitrates and citric acid. The X-ray diffraction patterns revealed that all the xerogels were converted into Cu/ZnO or Cu–ZnO/SiO2 catalysts directly without further reduction. Cu crystallite size in the as-burnt catalyst which was prepared by surface impregnation combustion method was limited to only 7 nm, because the support SiO2 could disperse Cu–ZnO, adsorb heat and promote heat diffusion, leading to the combustion process significantly mild and smooth. The activity of the as-burnt catalysts was investigated for low-temperature methanol synthesis from syngas containing CO2 using 2-butanol as a promoter at 443 K and 5.0 MPa for 4 h. The activity of the as-burnt Cu/ZnO and Cu–ZnO/SiO2 catalyst was closely related to Cu0 surface areas and the Cu crystallite sizes. The effects of different preparation methods on the properties of catalysts were studied by XRD, TG–DTA, FT-IR, Raman spectrum, SEM, BET and N2O chemisorption techniques.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (224 K)Download as PowerPoint slideHighlights► A novel surface impregnation combustion method (in the argon atmosphere) was improved to prepare supported metallic catalysts directly without further reduction. ► Cu crystallite size was limited to only 7 nm, because the support SiO2 could disperse Cu–ZnO, adsorb heat and promote heat diffusion, leading to the combustion process significantly gentle and smooth. ► The activity of the as-burnt Cu/ZnO and Cu–ZnO/SiO2 catalyst was closely related to Cu0 surface areas and the Cu crystallite sizes.

Keywords
Metallic catalysts; Nanoparticles; Cu/ZnO; Surface impregnation combustion; Low-temperature methanol synthesis
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Surface impregnation combustion method to prepare nanostructured metallic catalysts without further reduction: As-burnt Cu–ZnO/SiO2 catalyst for low-temperature methanol synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 54–60
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