Conversion of coal wastes into waste-cleaning materials. Quarterly progress report, October 1--December 31, 1995

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The authors have been investigating the conversion of fly ash into mesoporous materials in the last several months. Although lamellar phase has been observed, the hexagonal phase has not. According to the literature, only the hexagonal phase survives after calcination. Therefore, the goal is to synthesize hexagonal mesoporous materials with fly ash. It was pointed out by Chen et al. that the Si/Al molar ratio in the precursor solution must be larger than 74 in order for the hexagonal mesoporous phase (MCM-41) to be formed. On the other hand, the Si/Al molar ratio in the fly ash is lower than ... continued below

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5 p.

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Shih, W.H. December 31, 1995.

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Description

The authors have been investigating the conversion of fly ash into mesoporous materials in the last several months. Although lamellar phase has been observed, the hexagonal phase has not. According to the literature, only the hexagonal phase survives after calcination. Therefore, the goal is to synthesize hexagonal mesoporous materials with fly ash. It was pointed out by Chen et al. that the Si/Al molar ratio in the precursor solution must be larger than 74 in order for the hexagonal mesoporous phase (MCM-41) to be formed. On the other hand, the Si/Al molar ratio in the fly ash is lower than 74. In the last three months, the authors did a systematic study on the effect of Si/Al molar ratio on the formation of MCM-41 phase. The Si/Al molar ratio was varied from 148 to 1, the smallest ratio allowed by the Loewenstein rule. It was found that the amount of Al in the precursor solution can be as high as Si/Al=1 without disrupting the formation of aluminosilicate mesoporous materials (MCM-41). As the Si/Al ratio in the precursor solution was varied, the structure and the physical properties of the MCM-41 materials were changed. Lower Si/Al ratios tend to have a smaller shrinkage in the d{sub 100}-spacing after calcination and have higher X-ray diffraction intensity. Results indicate that as the Al content increases, the MCM-41 materials tend to have a thicker cell wall.

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5 p.

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OSTI as DE96012092

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  • Other Information: PBD: [1995]

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  • Other: DE96012092
  • Report No.: DOE/PC/94215--T6
  • Grant Number: FG22-94PC94215
  • DOI: 10.2172/251301 | External Link
  • Office of Scientific & Technical Information Report Number: 251301
  • Archival Resource Key: ark:/67531/metadc668800

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  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Nov. 30, 2015, 6:46 p.m.

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Shih, W.H. Conversion of coal wastes into waste-cleaning materials. Quarterly progress report, October 1--December 31, 1995, report, December 31, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc668800/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.