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Modified HZSM-5 as FCC additive for enhancing light olefins yield from catalytic cracking of VGO

Paper ID Volume ID Publish Year Pages File Format Full-Text
39721 45832 2014 12 PDF Available
Title
Modified HZSM-5 as FCC additive for enhancing light olefins yield from catalytic cracking of VGO
Abstract

•Mn/HZSM-5 as an FCC additive for boosting light olefins yield.•Alkaline treated HZSM-5 of micro–meso pore architecture as an FCC additive.•Mn/HZSM-5 and mesoHZSM-5 exhibited comparable enhancement to light olefins.•Mn/HZSM-5 exhibited higher density of Lewis sites compared with parent HZSM-5.•Alkaline treated HZSM-5 showed high density of Lewis sites and improved diffusion.

HZSM-5 with varying Si/Al2 ratios were modified with Mn and alkaline treatment and tested as FCC catalyst additives to enhance the yield of light olefins (in particular, propylene) from catalytic cracking of hydrotreated Arab Light vacuum gas oil (VGO). The performance of the Mn/HZSM-5 and alkaline treated HZSM-5 additives were assessed using a commercial equilibrium USY FCC catalyst (E-Cat) in a fixed-bed micro-activity test unit at 550 °C and various catalyst/oil ratios. The yield of light olefins over E-Cat containing parent HZSM-5 increased to 18.1, 25.4 and 27.4 wt% for Si/Al2 of 30, 80 and 280, respectively, compared with 15.4 wt% over E-Cat (at 75 wt% conversion). Further increase in light olefins yield was achieved upon using Mn modified HZSM-5 as an additive. The highest light olefins yield of 29.2 wt% was achieved over E-Cat-Mn/HZSM-5 (Si/Al2 = 80, 2.0 wt% Mn). The enhanced production of light olefins over the Mn/HZSM-5 additive is mainly attributed to the decrease in the acid density and the amount of strong acid sites, and (possibly) the partial narrowing of ZSM-5 micropore. Alkaline treated HZSM-5 also exhibited high light olefins yield compared with parent HZSM-5, due to the formation of hierarchical micro-meso topology. The highest light olefins yield of ∼28.3 wt% was obtained over E-Cat-containing alkaline treated HZSM-5 (Si/Al2 = 80–280, using the appropriate desilication conditions).

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Keywords
Modified HZSM-5; FCC additives; Manganese; Alkaline treatment; Light olefins
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Modified HZSM-5 as FCC additive for enhancing light olefins yield from catalytic cracking of VGO
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 477, 5 May 2014, Pages 172–183
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