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Effect of SiO2/Al2O3 ratio on the performance of nanocrystal ZSM-5 zeolite catalysts in methanol to gasoline conversion

Paper ID Volume ID Publish Year Pages File Format Full-Text
38778 45790 2016 9 PDF Available
Title
Effect of SiO2/Al2O3 ratio on the performance of nanocrystal ZSM-5 zeolite catalysts in methanol to gasoline conversion
Abstract

•Nanocrystal ZSM-5 of different SiO2/Al2O3 ratios but same sizes were obtained.•The effect of SiO2/Al2O3 ratio on methanol to gasoline was systematically studied.•Increasing SiO2/Al2O3 ratio reduced durene yield and improved catalyst durability.•Low SiO2/Al2O3 ratios promoted C1-C4 and durene selectivity.•Catalysts with low SiO2/Al2O3 ratios deactivated more rapidly due to coking.

In this study, the effect of SiO2/Al2O3 ratio on the catalytic performance of nanocrystal ZSM-5 zeolite catalyst in the methanol to gasoline conversion (MTG) was investigated. A series of zeolite samples with different SiO2/Al2O3 ratios of 23, 47, 107, 217 and 411 were synthesised. Through systematically controlling the material synthesis conditions, these nanocrystal ZSM-5 zeolite samples were produced to have very similar crystal sizes and structural properties, thus providing an ideal opportunity to study the intrinsic effect of SiO2/Al2O3 ratio on the performance of the ZSM-5 samples in MTG. The MTG experimentation was carried out in a fixed-bed reactor under a set of constant conditions of temperature 375 °C, pressure 1 MPa and WHSV 2 h−1. A steady methanol conversion was sustained with increasing the SiO2/Al2O3 ratio, and a progressive decrease in methanol conversion was found over catalysts with low SiO2/Al2O3 ratios (≤107) after 5 h on stream. Decreasing the SiO2/Al2O3 ratio promoted C1-C4 selectivity and thus decreased gasoline yield. It was also found that decreasing the SiO2/Al2O3 ratio promoted aromatisation reactions and hence higher durene selectivity and more coke formation, resulting in rapid catalyst deactivation. The sample with SiO2/Al2O3 ratio of 217 showed the highest methanol conversion, gasoline yield, and very low coke formation.

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Keywords
Catalyst deactivation; Coke formation; Methanol to gasoline; Nanocrystal ZSM-5; SiO2/Al2O3 ratio
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Effect of SiO2/Al2O3 ratio on the performance of nanocrystal ZSM-5 zeolite catalysts in methanol to gasoline conversion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 523, 5 August 2016, Pages 312–320
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