Effect of nitric acid on the pore structure and fractal characteristics of coal based on the low-temperature nitrogen adsorption method

To study the pore structure and fractal characteristics of acid-treated coal, in this paper, the low-temperature nitrogen adsorption method, scanning electron microscopy and the fractal theory were used to analyze the coal samples. The results show that the acid treatment enlarged the wedge-shaped h...

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Published inPowder technology Vol. 367; pp. 506 - 516
Main Authors Ni, Guanhua, Li, Shang, Rahman, Sheik, Xun, Meng, Wang, Hui, Xu, Yuhang, Xie, Hongchao
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.05.2020
Elsevier BV
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Abstract To study the pore structure and fractal characteristics of acid-treated coal, in this paper, the low-temperature nitrogen adsorption method, scanning electron microscopy and the fractal theory were used to analyze the coal samples. The results show that the acid treatment enlarged the wedge-shaped hole into a cylindrical hole. Under the influence of HNO3, the ash, volatile and sulfur contents are negatively correlated with the fractal dimension of the pore surface (D1) and positively correlated with the fractal dimension of the pore structure (D2). And the specific surface area and total pore volume of the coal samples are positively correlated with D1 and negatively correlated with D2 after acid treatment. Influenced by the specific surface area and total pore volume, the relationship between the fractal dimension and adsorption is consistent with the relationship between the fractal dimension and specific surface area/total pore volume. [Display omitted] •The effect of acid treatment on coal quality was evaluated quantitatively.•The effect of acid treatment on adsorption property was investigated.•The relationship between fractal dimension and pore structure parameters is established.•The relationship between fractal dimension and coal characteristics is established.
AbstractList To study the pore structure and fractal characteristics of acid-treated coal, in this paper, the low-temperature nitrogen adsorption method, scanning electron microscopy and the fractal theory were used to analyze the coal samples. The results show that the acid treatment enlarged the wedge-shaped hole into a cylindrical hole. Under the influence of HNO3, the ash, volatile and sulfur contents are negatively correlated with the fractal dimension of the pore surface (D1) and positively correlated with the fractal dimension of the pore structure (D2). And the specific surface area and total pore volume of the coal samples are positively correlated with D1 and negatively correlated with D2 after acid treatment. Influenced by the specific surface area and total pore volume, the relationship between the fractal dimension and adsorption is consistent with the relationship between the fractal dimension and specific surface area/total pore volume. [Display omitted] •The effect of acid treatment on coal quality was evaluated quantitatively.•The effect of acid treatment on adsorption property was investigated.•The relationship between fractal dimension and pore structure parameters is established.•The relationship between fractal dimension and coal characteristics is established.
To study the pore structure and fractal characteristics of acid-treated coal, in this paper, the low-temperature nitrogen adsorption method, scanning electron microscopy and the fractal theory were used to analyze the coal samples. The results show that the acid treatment enlarged the wedge-shaped hole into a cylindrical hole. Under the influence of HNO₃, the ash, volatile and sulfur contents are negatively correlated with the fractal dimension of the pore surface (D₁) and positively correlated with the fractal dimension of the pore structure (D₂). And the specific surface area and total pore volume of the coal samples are positively correlated with D₁ and negatively correlated with D₂ after acid treatment. Influenced by the specific surface area and total pore volume, the relationship between the fractal dimension and adsorption is consistent with the relationship between the fractal dimension and specific surface area/total pore volume.
To study the pore structure and fractal characteristics of acid-treated coal, in this paper, the low-temperature nitrogen adsorption method, scanning electron microscopy and the fractal theory were used to analyze the coal samples. The results show that the acid treatment enlarged the wedge-shaped hole into a cylindrical hole. Under the influence of HNO3, the ash, volatile and sulfur contents are negatively correlated with the fractal dimension of the pore surface (D1) and positively correlated with the fractal dimension of the pore structure (D2). And the specific surface area and total pore volume of the coal samples are positively correlated with D1 and negatively correlated with D2 after acid treatment. Influenced by the specific surface area and total pore volume, the relationship between the fractal dimension and adsorption is consistent with the relationship between the fractal dimension and specific surface area/total pore volume.
Author Wang, Hui
Ni, Guanhua
Rahman, Sheik
Xie, Hongchao
Xu, Yuhang
Li, Shang
Xun, Meng
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Snippet To study the pore structure and fractal characteristics of acid-treated coal, in this paper, the low-temperature nitrogen adsorption method, scanning electron...
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SubjectTerms acid treatment
Acids
Adsorption
Coal
Coal characteristics
Correlation
Fractal analysis
Fractal dimension
fractal dimensions
Fractal geometry
Fractals
Low temperature
Low-temperature nitrogen adsorption
Nitric acid
Nitric acid treatment
Nitrogen
Pore structure
Porosity
Scanning electron microscopy
Specific surface
Sulfur
Surface area
Surface chemistry
Title Effect of nitric acid on the pore structure and fractal characteristics of coal based on the low-temperature nitrogen adsorption method
URI https://dx.doi.org/10.1016/j.powtec.2020.04.011
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