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Regenerable metal oxide composite pa...

Gupta, Puneet.

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Regenerable metal oxide composite particles and their use in novel chemical processes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Regenerable metal oxide composite particles and their use in novel chemical processes./
作者:	Gupta, Puneet.
面頁冊數:	319 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3284.
Contained By:	Dissertation Abstracts International67-06B.
標題:	Chemistry, Organic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3221301
ISBN:	9780542723636

Regenerable metal oxide composite particles and their use in novel chemical processes.
Gupta, Puneet.

Regenerable metal oxide composite particles and their use in novel chemical processes. - 319 p.

Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3284.

Thesis (Ph.D.)--The Ohio State University, 2006.

High Temperature gas-solid reactions have been commercially limited to applications where solids act as raw materials for the process. Examples include coal combustions, time production, iron smelting. Despite studies been conducted to use various metal oxide materials for high temperature removal of contaminants like SOX, CO2, etc. for a long time, virtually no actual commercial process exists where gas-solid reactions are at the heart/facilitator for the process to exist. In order to achieve such a goal, the particles need to be regenerable, i.e. they should be able to undergo multiple reaction/regeneration reactions without loss in activity. However, at high temperatures, the particles rapidly lose activity with reaction cycling and hence have to be replaced increasing the process costs making the processes unviable.

ISBN: 9780542723636Subjects--Topical Terms:

516206
Chemistry, Organic.

Regenerable metal oxide composite particles and their use in novel chemical processes.
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245 1 0 $a Regenerable metal oxide composite particles and their use in novel chemical processes.
300 $a 319 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-06, Section: B, page: 3284.
500 $a Adviser: Liang-Shih Fan.
502 $a Thesis (Ph.D.)--The Ohio State University, 2006.
520 $a High Temperature gas-solid reactions have been commercially limited to applications where solids act as raw materials for the process. Examples include coal combustions, time production, iron smelting. Despite studies been conducted to use various metal oxide materials for high temperature removal of contaminants like SOX, CO2, etc. for a long time, virtually no actual commercial process exists where gas-solid reactions are at the heart/facilitator for the process to exist. In order to achieve such a goal, the particles need to be regenerable, i.e. they should be able to undergo multiple reaction/regeneration reactions without loss in activity. However, at high temperatures, the particles rapidly lose activity with reaction cycling and hence have to be replaced increasing the process costs making the processes unviable.
520 $a The work described in this Thesis starts with understanding key issues that would allow the metal oxide particles to be regenerable over numerous reaction/regeneration cycles. Specifically it was found that for applications in the temperature range 400-700°C, the particle pore structure plays a crucial role in ensuring good recyclability. It was found that presence of mesoporosity (20-200A) is necessary to ensure a slow decline in reactivity over time. For processes working at higher temperatures above 800°C, it was found that sintering leads to complete destruction of pore structure and hence other properties like oxygen ion diffusivity into and out of the particle becomes very important to ensure complete recyclability.
520 $a Given the understanding obtained regarding causes for recyclability, further work is divided into two broad categories namely development of particle and process for low and high temperature operations. As pore structure is important for low temperature operations, initial work is devoted to developing control over it when a sol gel synthesis procedure for metal oxides is used. Specifically, the work is related to the synthesis of a high surface area SiC substrate with controlled pore structure that can be used as a sorbent/catalyst support or use in various hot gas cleaning operations as well as high temperature catalyst applications. SiC with very high surface area exceeding 500m 2/g was obtained and good control over the mesoporosity and microporosity was obtained by suitable modification to the sol gel procedures. Subsequent work was carried out in order to develop a SiC-Fe-Ti-O sorbent in order to remove H2S from coal derived syn gas. (Abstract shortened by UMI.)
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650 4 $a Engineering, Environmental. $3 783782
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