Air oxidation of aqueous sodium sulfide solutions with coal fly ash

被引：17

作者：

Mallik, D ^{[1
]}

Chaudhuri, SK ^{[1
]}

机构：

[1] Univ Calcutta, Dept Chem Engn, Calcutta 700009, W Bengal, India

来源：

WATER RESEARCH | 1999年 / 33卷 / 02期

关键词：

sodium sulfide; air oxidation; fly ash; heterogeneous catalyst;

D O I：

10.1016/S0043-1354(98)00205-X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The potential of coal fly ash was studied as a catalyst in the air oxidation of aqueous sodium sulfide (Na2S) solutions in the temperature range of 303-333 K. The rate of oxidation was found to be independent of the initial concentration of Na2S in the range of 5.80 x 10(-2)-28.45 x 10(-2) kmol/m(3). The effects of fly ash loading, source of fly ash, speed of agitation, air flow rate, fly ash particle size were also studied. Experimental results suggested a film-diffusion controlled reaction mechanism and 4% Ay ash loading intensified the reaction rate by a factor of 3.5 over that of without fly ash at 303 K. The deactivation of the catalytic effect of fly ash was found to be less than 31% even after fifth repeated uses. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：585 / 590

页数：6

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