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Shape selective methanol to olefins over highly thermostable DDR catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41642 45895 2011 10 PDF Available
Title
Shape selective methanol to olefins over highly thermostable DDR catalysts
Abstract

ZSM-58, having a DDR topology, is shown to be a very attractive catalyst for the direct formation of propylene and ethylene via conversion of methanol. A performance similar to the state of the art SAPO-34 catalysts is achieved, while no olefins longer than C4 are formed. In addition, ZSM-58 has a much higher thermostability than SAPO catalysts.Mainly propylene, ethylene and linear butenes (trans-but-2-ene and butadiene) are formed when materials with the DDR topology are used as catalysts during the MTO process. The ratio propylene/ethylene can be tuned by changing the reaction conditions or the degree of catalyst coking. An optimum in performance, in terms of stability and selectivity, is found for catalysts containing one acid site (one Al) per accessible cavity. Deactivation of the catalysts takes place due to formation of coke and homogeneous blocking of the catalysts porosity. Activity is fully recovered after regeneration in air.

Graphical abstractZSM-58, having a DDR topology, is shown to be a very attractive catalyst for the direct formation of propylene and ethylene via conversion of methanol. Mainly propylene, ethylene and linear butenes (trans-but-2-ene and butadiene) are formed when materials with the DDR topology are used as catalysts during the MTO process. The ratio propylene/ethylene can be tuned by changing the reaction conditions.Figure optionsDownload full-size imageDownload high-quality image (72 K)Download as PowerPoint slideResearch highlights▶ Propylene and ethylene are the major products when ZSM-58 is used as catalysts for the MTO process. ▶ Propylene/ethylene ratio can be tuned. ▶ Activity is fully recovered after regeneration in air.

Keywords
DDR; ZSM-58; MTO; ZSM-5; NH3-TPD
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Shape selective methanol to olefins over highly thermostable DDR catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 234–243
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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