fulltext.study @t Gmail

The effect of hydrothermal treatment of FCC catalysts and ZSM-5 additives in catalytic conversion of biomass

Paper ID Volume ID Publish Year Pages File Format Full-Text
40732 45863 2012 9 PDF Available
Title
The effect of hydrothermal treatment of FCC catalysts and ZSM-5 additives in catalytic conversion of biomass
Abstract

Fresh fluid catalytic cracking (FCC) catalysts and ZSM-5 additives were hydrothermally treated with 100% steam at 732 °C (1350 °F) and 788 °C (1450 °F) for 4 h in a fluidized bed reactor. The catalytic pyrolysis of hybrid poplar wood with fresh and steam treated catalysts was conducted in a 50 mm bench scale bubbling fluidized bed reactor at 475 °C and a weight hourly space velocity (WHSV) of 2 h−1. BET surface area measurements showed a reduction of 24% and 34% in the surface area of the FCC catalyst after steam treatment at 732 °C and 788 °C respectively. The non-phosphorus based ZSM-5 additive lost about 15% of its surface area after mild steaming at 732 °C. However, the phosphorus impregnated ZSM-5 additive was not affected at both steaming conditions. The hydrothermal treatment of the catalysts influenced the catalytic product distribution and the quality of the bio-oil. The steamed FCC catalyst produced higher organic liquid and gas yields and lower formation of coke and water. The viscosity and the density of the bio-oils produced from the steamed FCC catalyst were lower than those produced with the fresh FCC catalyst. In the case of the ZSM-5 additives, the steam treatment affected only the organic liquid and gas yields. The organic liquid yield increased and the gas yield decreased. Steaming of the ZSM-5 additive did not show any effect on the char/coke yield as was seen with the FCC catalyst due to the lower tendency of ZSM-5 to form coke. The GC analysis of the product gases suggested that steam treatment influenced the catalyst selectivity in the formation of CO, CO2, H2, CH4 and C2C5 hydrocarbons. The 13C NMR analysis of the bio-oil showed generally that steaming of the FCC catalyst increased the selectivity for the production of aromatic hydrocarbons.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideHighlights► Hydrothermal treatment of the FCC catalyst reduced the selectivity for coke. ► Mild steam treatment at 732 °C for 4 h FCC catalyst produced bio-oils of higher quality. ► Phosphorus stabilization of ZSM-5 prevented detrimental effects of steam treatment on the process. ► The effect of steam treatment of Y-zeolite FCC catalyst was different from the ZSM-5 based additives.

Keywords
Catalytic pyrolysis of biomass; Catalyst steaming; FCC catalyst; ZSM-5 additives; Bio-oils
First Page Preview
The effect of hydrothermal treatment of FCC catalysts and ZSM-5 additives in catalytic conversion of biomass
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 445–446, 28 November 2012, Pages 312–320
Authors
, , , ,
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