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Using bio-chars as potential catalys...

Jin, Wenjia.

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Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors./
Author:	Jin, Wenjia.
Description:	76 p.
Notes:	Source: Masters Abstracts International, Volume: 52-04.
Contained By:	Masters Abstracts International52-04(E).
Subject:	Wood sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1549754
ISBN:	9781303626012

Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors.
Jin, Wenjia.

Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors. - 76 p.

Source: Masters Abstracts International, Volume: 52-04.

Thesis (M.S.)--West Virginia University, 2013.

This item must not be sold to any third party vendors.

Pyrolysis is a promising thermochemical conversion method to process lignocellulosic biomass to produce bio-oil that can be further refined into chemicals and fuels compatible with current petrochemical fuels. However, bio-oils are highly reactive and unstable and therefore must be refined immediately, thereby reducing process sustainability. Catalytic modifications of pyrolysis vapors have been researched to improve bio-oil stability. However, using traditional highly active petroleum refining cracking catalysts for catalytic pyrolysis has shown some negative results, for example, increasing bio-oil moisture content and reducing its calorific value. Therefore, this project aims at understanding decomposition behavior of wood components, its chemical constituent polymers and using moderate catalysts, like bio-chars.

ISBN: 9781303626012Subjects--Topical Terms:

3168288
Wood sciences.

Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors.
LDR:04176nmm a2200325 4500 001 2060670
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020 $a 9781303626012
035 $a (MiAaPQ)AAI1549754
035 $a AAI1549754
040 $a MiAaPQ $c MiAaPQ
100 1 $a Jin, Wenjia. $3 3174845
245 1 0 $a Using bio-chars as potential catalysts for upgrading wood pyrolysis vapors.
300 $a 76 p.
500 $a Source: Masters Abstracts International, Volume: 52-04.
500 $a Adviser: Kaushlendra Singh.
502 $a Thesis (M.S.)--West Virginia University, 2013.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Pyrolysis is a promising thermochemical conversion method to process lignocellulosic biomass to produce bio-oil that can be further refined into chemicals and fuels compatible with current petrochemical fuels. However, bio-oils are highly reactive and unstable and therefore must be refined immediately, thereby reducing process sustainability. Catalytic modifications of pyrolysis vapors have been researched to improve bio-oil stability. However, using traditional highly active petroleum refining cracking catalysts for catalytic pyrolysis has shown some negative results, for example, increasing bio-oil moisture content and reducing its calorific value. Therefore, this project aims at understanding decomposition behavior of wood components, its chemical constituent polymers and using moderate catalysts, like bio-chars.
520 $a Thermo-chemical decomposition behavior for wood components (bark, sapwood and heartwood) and individual wood-polymers (cellulose, hemicellulose and lignin) of typical hardwood is presented. Two hardwood species, namely red oak and yellow-poplar, were separated into their bark, sapwood and heartwood components. The samples were tested for calorific value, specific gravity, proximate analysis, mineral composition, chemical composition, ultimate analysis, and thermo-chemical decomposition behavior. In addition, the thermo-chemical decomposition behaviors of cellulose, xylan, and lignin polymers were tested. The activation energy was calculated for various fractional conversion values using the isoconversion method. The results showed that char yields from lignin, cellulose and xylan polymers were 41.43%, 4.45% and 1.89%, respectively, at the end of pyrolysis. Furthermore, cellulose, xylan and lignin polymers decomposed dramatically in the temperature ranges of 320 °C to 360 °C, 150 °C to 230 °C and 100 °C to 410 °C, respectively, with decomposition peaks at 340 °C, 200 °C and 340°C, respectively. In addition, the maximum activation energy for cellulose was 381 kJ/mol at 360 °C and for xylan it was 348 kJ/mol at 210°C.
520 $a Catalytic performance of catalysts switchgrass bio-char and red oak bark bio-char during vapor upgrading pyrolysis are documented. The clean woodchip was pyrolyzed with and without vapor upgrading under atmosphere pressure at the target temperature of 500 °C. The catalysts showed significant positive effects on the bio-oil yields, moisture content and pH value of bio-oils. However, the vapor upgrading process significantly decreased the carbon yield of bio-oil when using switchgrass bio-char as catalyst. The bio-oil yield decreased from 49.31% (no catalyst) to 44.81% (switchgrass bio-char catalyst) and to 48.68% (red oak bark bio-char catalyst). The lost mass of bio-oil ended-up in the gaseous phase as reflected in hydrogen, carbon dioxide, and carbon monoxide content. As result, at 400°C, hydrogen content increased from 0.82% to 3.74%, carbon dioxide content increased from 21.16% to 32.33%, and carbon monoxide content increased from 16.49% to 23.19% for switchgrass bio-char catalyst compared to no catalyst pyrolysis.
590 $a School code: 0256.
650 4 $a Wood sciences. $3 3168288
650 4 $a Forestry. $3 895157
690 $a 0746
690 $a 0478
710 2 $a West Virginia University. $b Davis College of Argriculture, Natural Resources, and Design. $3 2103037
773 0 $t Masters Abstracts International $g 52-04(E).
790 $a 0256
791 $a M.S.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1549754