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Transient behavior of vanadyl pyrophosphate catalysts during the partial oxidation of n‑butane in industrial-sized, fixed bed reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
39009 45801 2016 10 PDF Available
Title
Transient behavior of vanadyl pyrophosphate catalysts during the partial oxidation of n‑butane in industrial-sized, fixed bed reactors
Abstract

•Macro-scale phosphorus dynamics studied in an industrial scale fixed bed reactor.•Significant changes in catalyst activity and reactor performance induced by only minor change in phosphorus and water dosing.•Strong interactions between phosphorus and water feed components as function of butane feed and space velocity.•This dynamic catalyst behavior is related to the VPO surface chemistry.

The industrially important application of vanadium phosphorus oxide catalysts is the partial oxidation of n -butane in multi-tubular fixed bed reactors. Despite many decades of investigation about the functionality of the catalyst, the reaction mechanism is still under debate. However, the loss of phosphorus from the catalyst as a technically important phenomenon was until now hardly considered in the scientific literature: this phosphorus loss during long term operation has a strong effect on the temperature distribution in the reactor, which in turn significantly affects the catalyst selectivity. Therefore, technical reactor operation usually requires the addition of ppm levels of an organic phosphorus compound together with water to the reactor feed. For a macro-scale investigation of the phosphorus dynamics, the present study reports elaborated experiments in an industrial scale fixed bed reactor. The experiments revealed significant changes in catalyst activity and reactor performance induced by only minor variations in the feed contents of phosphorus and water as function of butane feed and space velocity, as well as strong interactions between these two additional feed components. These observations are further related to the many literature reports about the active catalyst surface. Common aspects explaining the dynamic catalyst behavior were combined in a new scheme for the VPP/VPO surface chemistry.

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Keywords
n-Butane oxidation; Maleic anhydride; Vanadium phosphorus oxide; Industrial fixed bed reactor; Process dynamics
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Transient behavior of vanadyl pyrophosphate catalysts during the partial oxidation of n‑butane in industrial-sized, fixed bed reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 510, 25 January 2016, Pages 1–10
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