Influence of potassium loading at different reaction temperatures on the NOx reduction process by potassium-containing coal pellets

被引:12
作者
Bueno-López, A
García-García, A
Caballero, JA
Linares-Solano, A
机构
[1] Univ Alicante, Dept Quim Inorgan, E-03080 Alicante, Spain
[2] Univ Alicante, Dept Ingn Quim, E-03080 Alicante, Spain
关键词
NOx reduction; coal pellets; potassium loading; reaction temperature; selectivity;
D O I
10.1016/S0016-2361(02)00275-2
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The activity of potassium-containing coal pellets and the corresponding free-metal char for NOx reduction in an oxygen-rich environment has been investigated by temperature-programmed reactions (TPRs) up to 750 degreesC, 2 h isothermal reactions in the range of 250-475 degreesC and lifetime tests, (until the samples were completely consumed), for selected samples and temperatures. An interesting 'reactivity window', where NOx reduction is observed, but carbon conversion is negligible, was found from TPRs experiment for a high potassium content sample, at moderate temperatures. This interval was not observed for the char. The catalytic effect of potassium is more dramatic at high temperatures, therefore, metal loading and reaction temperature are very much interrelated. Lifetime tests provide a very valuable information (average selectivity, profitable use of samples for NOx reduction, etc.), allowing us to check the whole efficiency of the samples. The progressive addition of potassium to the pellets makes samples more effective in terms of. (i) capacity to reduce higher NOx amounts; (ii) maximum NOx conversion values and (iii) higher values of average selectivity. In general, the samples studied, exhibit a maximum temperature, very much dependent on their potassium contents, that must not be exceeded with a view to practical applications. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:267 / 274
页数:8
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