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Validation of BET specific surface area for heterogeneous Ziegler-Natta catalysts based on αS-plot

Paper ID Volume ID Publish Year Pages File Format Full-Text
40842 45868 2012 4 PDF Available
Title
Validation of BET specific surface area for heterogeneous Ziegler-Natta catalysts based on αS-plot
Abstract

Specific surface area based on the BET method in N2 adsorption has historically posed poor correlation with olefin polymerization activity of heterogeneous Ziegler-Natta (ZN) catalysts. We have investigated the validity of the BET surface area for ZN catalysts based on the αS-plot method, where non-porous core–shell MgO/MgCl2/TiCl4 catalysts were used as a reference material. The αS-plots for typical industrial ZN catalysts clarified the presence of two classes of micropores and resultant difficulty to isolate a multilayer adsorption region for the BET method. The results cast doubt on the application of the BET method to evaluate the surface area of heterogeneous ZN catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (243 K)Download as PowerPoint slideHighlights► Validation of the BET surface area of Ziegler-Natta catalysts based on the αS-plot method. ► Non-porous core–shell MgO/MgCl2/TiCl4 catalysts were used as reference. ► Micropore filling heavily overlaps with a multilayer adsorption region for the BET analysis. ► The BET surface area is questionable for typical Ziegler-Natta catalysts.

Keywords
Ziegler-Natta polymerization; Polyolefin; Nitrogen adsorption; BET method; αS-Plot
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Validation of BET specific surface area for heterogeneous Ziegler-Natta catalysts based on αS-plot
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 437–438, 26 September 2012, Pages 24–27
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