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High silica REHY zeolite with low rare earth loading as high-performance catalyst for heavy oil conversion

Paper ID Volume ID Publish Year Pages File Format Full-Text
41116 45877 2012 7 PDF Available
Title
High silica REHY zeolite with low rare earth loading as high-performance catalyst for heavy oil conversion
Abstract

Study on the rare earth exchange performance was carried out with high silica, normal silica and low silica NaY zeolites with framework SiO2/Al2O3 ratios of 5.8, 4.8 and 4.6, respectively. It is found that the silicon content of the starting NaY zeolite is one of the significant factors in determining the ion exchange efficiency. The higher the framework SiO2/Al2O3 ratio is, the less selective to the rare earth ions the zeolite will be. However, the efficiency of the use of rare earth ions are comparable to each other when the concentration of rare earth in the ion exchange solution is less than 6 wt.%, no matter the level of the framework SiO2/Al2O3 ratio of the starting zeolites. Comparison of the hydrothermal stability of the rare earth and ammonium exchanged zeolites (REHY) indicates that the REHY sample prepared from the high silica NaY and with the lowest rare earth loading (2.9 wt.%) exhibits the best hydrothermal stability. The reaction studies indicate that the catalyst containing this REHY zeolite shows much better activity and product selectivity in the catalytic conversion of heavy oil than another REHY zeolite prepared from the normal silica NaY zeolite and having a rare earth loading as high as 6.6 wt.%, which is highly probably due to the superior hydrothermal stability of the former zeolite. It is suggested that the REHY zeolite with a low level of rare earth loading prepared from the high silica NaY can be considered as an alternative catalyst for the catalytic conversion of gas oil.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (143 K)Download as PowerPoint slideHighlights► The Si/Al ratio of zeolite determines the utilization efficiency of rare earth (RE). ► The higher the Si/Al ratio, the less selective the zeolite to RE. ► The higher the Si/Al ratio, the more difficult to remove residual sodium. ► High silica NaY derived REHY zeolite with low RE loading is stable and able.

Keywords
Y zeolite; Rare earth ions; Ion exchange; Stability; Catalytic cracking
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High silica REHY zeolite with low rare earth loading as high-performance catalyst for heavy oil conversion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 254–260
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