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Hydroprocessing of hydrocracker bottom on Pd containing bifunctional catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53529 46973 2016 9 PDF Available
Title
Hydroprocessing of hydrocracker bottom on Pd containing bifunctional catalysts
Abstract

•Pd/ASA-Al2O3 catalyst has the highest selectivity to middle distillates.•Pd/Beta-ASA-Al2O3 catalyst has high hydrocracking and hydroisomerization activities.•Pd/ZSM-23-ASA-Al2O3 catalyst has the highest hydroisomerization activity.

Bifunctional catalysts Pd/ASA-Al2O3, Pd/Y-ASA-Al2O3, Pd/Beta-ASA-Al2O3, Pd/ZSM-23-ASA-Al2O3 were prepared. Catalysts were characterized by FTIR of adsorbed CO, nitrogen adsorption and CO chemisorption. Average sizes of palladium particles in the catalysts were found to be 1.2–2.9 nm. Zeolite-based catalysts contained stronger Brønsted acidic sites than amorphous silica-alumina (ASA) based catalyst Pd/ASA-Al2O3. Catalysts were tested in hydroconversion of hydrocracker bottom (HCB). Hydrocracking activities of Pd/Y-ASA-Al2O3 and Pd/Beta-ASA-Al2O3 catalysts were found to be significantly higher than that of Pd/ASA-Al2O3 and Pd/ZSM-23-ASA-Al2O3 catalysts. Conversion of 80% of HCB was achieved for catalysts with zeolites beta and Y at 250 °C. It was found that selectivity to middle distillates increases in following order: Pd/ZSM-23-ASA-Al2O3 < Pd/Beta-ASA-Al2O3 < Pd/Y-ASA-Al2O3 < Pd/ASA-Al2O3. The highest yield of middle distillates was achieved for Pd/ASA-Al2O3 catalyst at 370 °C. Ratio of hydroisomerization to hydrocracking activity was found to increase in the following order of catalysts: Pd/Y-ASA-Al2O3 ≤ Pd/ASA-Al2O3 < Pd/Beta-ASA-Al2O3 < Pd/ZSM-23-ASA-Al2O3. Middle distillate with pour and cloud points of −61.5 and −62.5 °C, respectively, was obtained at 240 °C with 31.3 wt.% yield using Pd/Beta-ASA-Al2O3 catalyst.

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Keywords
Hydrocracker bottom; Middle distillate; Bifunctional catalyst; Hydrocracking; Hydroisomerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 271, 1 August 2016, Pages 154–162
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