Effect of coal pre-oxidation on the optical texture and porosity of pyrolysis chars

被引：0

作者：

Ruiz, B. ^{[1
]}

Parra, J.B. ^{[1
]}

Pajares, J.A. ^{[1
]}

Pis, J.J. ^{[1
]}

机构：

[1] Instituto Nacional del Carbón, C.S.I.C., Apartado 73, 33080 Oviedo, Spain

来源：

Journal of Analytical and Applied Pyrolysis | 2006年 / 75卷 / 01期

关键词：

The preparation of activated carbons from bituminous coals usually involves three steps: oxidation; pyrolysis and activation. The porous texture of the final products is conditioned by the previous treatments. In this work; we study the effect of the variables used in the oxidation and pyrolysis steps on the optical texture and the porous structure of the materials obtained. Coals with thermoplastic properties must be oxidised in order to reduce or eliminate plastic behaviour and so ensure a char with a suitable porous network development during the carbonisation step. A high-rank coal was ground and sieved to 1-3 and 0.125-0.425 mm particle size; and then oxidised in an oven with a forced circulation of air; at; 270; °C; for periods between 1 and 7 days. The pyrolysis of fresh and oxidised coal samples was performed under nitrogen up to 850 °C at a heating rate of 60 °C min-1. Optical and scanning electron microscopy techniques show the progression of oxidation in the char particles following the shrinking-core model. As the pre-oxidation time increases; the chars lose any vestige of plasticity and the materials show adequate properties as precursors of activated carbons. © 2005 Elsevier B.V. All rights reserved;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Journal article (JA)

引用

页码：27 / 32

共 50 条

[1] Effect of coal pre-oxidation on the optical texture and porosity of pyrolysis chars
Ruiz, B
Parra, JB
Pajares, JA
Pis, JJ
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, 2006, 75 (01) : 27 - 32
[2] EFFECT OF PRE-OXIDATION ON REACTIVITY OF CHARS IN STEAM
GOMI, K
HISHINUMA, Y
FUEL, 1982, 61 (01) : 77 - 80
[3] EFFECT OF PRE-OXIDATION ON REACTIVITY OF CHARS IN STEAM
GOMI, K
HISHINUMA, Y
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1981, 181 (MAR): : 41 - FUEL
[4] Effect of pre-oxidation at low temperature on the carbonization behavior of coal
Worasuwannarak, N
Nakagawa, H
Miura, K
FUEL, 2002, 81 (11-12) : 1477 - 1484
[5] Effect of pre-oxidation on the development of porosity in activated carbons from petroleum coke
Lu, Chunlan
Xu, Shaoping
Wang, Mei
Wei, Ligang
Liu, Shuqin
Liu, Changhou
CARBON, 2007, 45 (01) : 206 - 209
[6] Effects of acidic oxidation on the porosity of coal waste-derived chars
Haghseresht, F
Lu, GQ
CARBON, 1999, 37 (04) : 639 - 646
[7] Effect of low-temperature pre-oxidation on the self-heating of coal
Liu, Hao
Li, Zenghua
Yang, Yongliang
Miao, Guodong
Li, Purui
Wang, Guoqin
FUEL, 2024, 356
[8] Effect of pre-oxidation on NDMA precursors
Selbes, Meric
Kim, Daekyun
Karanfil, Tanju
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2014, 248
[9] Effect of Pre-oxidation on the Properties of Crushed Bituminous Coal and Activated Carbon Prepared Therefrom
School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing, 100083, China
不详
不详
J. China Univ. Min. Technol., 2007, 4 (494-497):
[10] Effect of pre-oxidation and cooling process on characteristics and mechanism of the coal re-ignition
Xu, Xiaoxue
Yuan, Shujie
Li, Jinhu
Guo, Shengli
ENERGY, 2024, 309

← 1 2 3 4 5 →