fulltext.study @t Gmail

Novel extruded fixed-bed MTO catalysts with high olefin selectivity and high resistance against coke deactivation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41644 45895 2011 7 PDF Available
Title
Novel extruded fixed-bed MTO catalysts with high olefin selectivity and high resistance against coke deactivation
Abstract

This report describes the catalytic performances of AlPO4/ZSM-5 extrudates in comparison to conventional alumina- and silica-bound extrudates in the fixed-bed MTO (methanol to olefins) conversion. The novel AlPO4/ZSM-5 extrudates are produced with an aluminium phosphate binder which undergoes a phase transition into an AlPO4-tridymite phase upon calcination of the greenbodies. The finished AlPO4/ZSM-5 extrudates are macroporous and mechanically very stable. In contrast to alumina, this novel matrix does not exhibit catalytic self-activity, and it does not release aluminium which is incorporated in the zeolite lattice. At temperatures above 400 °C, AlPO4/ZSM-5 extrudates show superior activity, propylene selectivity and stability. The coke deactivation of AlPO4/ZSM-5 extrudates can further be reduced dramatically, if a pre-reactor is installed upstream, where an equilibrium mixture of dimethyl ether (DME), methanol and water (XMeOH = 87.7% at 275 °C) is produced. In contrast, the insertion of the DME pre-reactor has no significant effect on the coke resistance when extrudates with alumina- or silica-matrices are used.

Graphical abstractThis report describes the catalytic performances of AlPO4/ZSM-5 extrudates in comparison to alumina- and silica-bound extrudates in the fixed-bed methanol to olefins conversion. The AlPO4-matrix is macroporous, non-reactive and does not release aluminium into the zeolite lattice. Above 400 °C, AlPO4/ZSM-5 extrudates show superior activity, selectivity and stability. Coke deactivation of AlPO4/ZSM-5 can further be reduced with a pre-reactor upstream, where dimethyl ether is produced.Figure optionsDownload full-size imageDownload high-quality image (85 K)Download as PowerPoint slide

Keywords
MTO (methanol to olefins); ZSM-5; Coke deactivation; Extrusion; Aluminium phosphate
First Page Preview
Novel extruded fixed-bed MTO catalysts with high olefin selectivity and high resistance against coke deactivation
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 391, Issues 1–2, 4 January 2011, Pages 254–260
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