DEVELOPMENT OF ACTIVATED CARBONS FROM COAL COMBUSTION BY-PRODUCTS

PDF Version Also Available for Download.

Description

The increasing role of coal as a source of energy in the 21st century will demand environmental and cost-effective strategies for the use of coal combustion by-products (CCBPs), mainly fly ash containing unburned carbon. However, the carbonaceous residue in fly ash, unburned carbon (UC), is a potential precursor for the production of adsorbent carbons, since it has gone through a devolatilization process while in the combustor, and therefore, only requires to be activated. Accordingly, this research program focuses on the development of activated carbons from the unburned carbon present in fly ash. During the present reporting period (June 30, 1999--June ... continued below

Physical Description

19 pages

Creation Information

Schobert, Prof. Harold H.; Maroto-Valer, Dr. M. Mercedes & Lu, Ms. Zhe July 31, 2000.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

The increasing role of coal as a source of energy in the 21st century will demand environmental and cost-effective strategies for the use of coal combustion by-products (CCBPs), mainly fly ash containing unburned carbon. However, the carbonaceous residue in fly ash, unburned carbon (UC), is a potential precursor for the production of adsorbent carbons, since it has gone through a devolatilization process while in the combustor, and therefore, only requires to be activated. Accordingly, this research program focuses on the development of activated carbons from the unburned carbon present in fly ash. During the present reporting period (June 30, 1999--June 29, 2000), Task 1 ''Procurement and characterization of CCBPs'' was initiated and samples from various combustion systems were collected. The suite assembled thus far includes samples from pulverized utility boilers with low-NOx burners and Selective Non Catalytic Reduction system, and also from an utility cyclone unit. The characterization studies showed that the sample from the cyclone unit contained the highest carbon content (LOI of {approx} 80%), since this unit has been retrofitted with a technology to separate the unburned carbon from the fly ash. In contrast, the sample from the unit retrofitted with a Selective Non Catalytic Reduction system showed the lowest carbon content with LOI values around 2-4%. The samples from the utility boilers with low-NOx burners were collected from the hot-side hoppers and present carbon contents {approx} 50%. The BET (N{sub 2} 77K) surface areas of the samples investigated were between 30-40 m{sup 2}/g and the pore volume is mainly due to mesopores. In addition, during this reporting period, also Task 2 ''Development of activated carbons'' and Task 3 ''Characterization of activated carbons'' were initiated. The investigations showed that after steam activation at 850 C, the unburned carbon samples generated activated carbons with microporous structure and surface areas up to 443 m{sup 2}/g. The samples activated with steam present generally higher surface areas than those using CO{sub 2} or KOH pretreatment, probably due to the faster reaction rate of steam. The activation process could tailor the inherent mesoporosity of these materials into the desired porosity for a specific application, since the mesophore volume accounted for {approx} 66% of the total pore volume for the parent samples, while after steam activation the micropore volume accounted for over 60% of the total.

Physical Description

19 pages

Notes

OSTI as DE00818152

Source

  • Other Information: PBD: 31 Jul 2000

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: NONE
  • Grant Number: FG26-99FT40593
  • DOI: 10.2172/818152 | External Link
  • Office of Scientific & Technical Information Report Number: 818152
  • Archival Resource Key: ark:/67531/metadc733725

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • July 31, 2000

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

Description Last Updated

  • Jan. 4, 2017, 1:37 p.m.

Usage Statistics

When was this report last used?

Yesterday: 0
Past 30 days: 1
Total Uses: 7

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Schobert, Prof. Harold H.; Maroto-Valer, Dr. M. Mercedes & Lu, Ms. Zhe. DEVELOPMENT OF ACTIVATED CARBONS FROM COAL COMBUSTION BY-PRODUCTS, report, July 31, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc733725/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.