Behavior of aluminum complexes in the altered coal and low temperature coal ashes

Title:

Behavior of aluminum complexes in the altered coal and low temperature coal ashes

Creator:

Pavel Straka

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:286b3378-af0e-49ca-8ef4-28a11422e99e
uuid:286b3378-af0e-49ca-8ef4-28a11422e99e
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, uhlí, coal, aluminum complexes, altered coal, low temperature ashes, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

An occurrence of tetra-coordinated aluminum in altered coal and low temperature coal ashes was investigated. As altered coal a sample from the Lazy mine (Upper Silesian Coal Basin) was tested, further, low-temperature ashes from different coals were prepared and measured. During preparation the selected coal samples were intensively air-oxidized; 27Al MAS NMR spectra of obtained ashes were then acquired and compared against those for initial coals. A reference wood ash and Al standards were used for identification of Al-forms. It was found that chemical shift at 4 ppm with coals corresponds to that for triaquo-hydroxo-diphenoxido-aluminum(III) complex (THDA), further, the shift at 72 ppm with altered coal and resulting ashes agrees with that for Al tetra-coordinated with oxygen. So, in the presence of coal organics the tetra-coordinated Al is formed under low temperature conditions, because during low temperature ashing the THDA complex is transformed to Al tetra-coordinated with oxygen only at 350 °C. A similar process occurred in the case of oxidation of coal substance under low temperature conditions in the nature at temperatures below 150 °C., Pavel Straka., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2010 Volume:7 | Number:4 (160)

Harvested from:

CDK

Metadata only:

false