试题与答案

烟气的脱硫(除SO2)技术和脱硝(除NOx)技术都是环境科学研究的热点。 (1)

题型:填空题

题目:

烟气的脱硫(除SO2)技术和脱硝(除NOx)技术都是环境科学研究的热点。

(1)烟气脱硫、脱硝的环境意义是___________________;

(2)一种选择性催化脱硝(NO2)的原理为:6NO2+8NH37N2+12H2O

① 上述反应中被还原的元素是_________(填元素符号),反应中每转移3mol电子,生成标准状况下

N2的体积为___________,

② 超音速飞机排放的尾气是平流层中NOx的主要来源。它们破坏臭氧层的主要机理为:

Ⅰ、O3O+OⅡ、NO+O3→NO2+O2  Ⅲ、NO2+O→NO+O2

上述反应中NOx所起的作用是____________;

(3)下表列出了2种燃煤烟气脱硫方法的原理。

①方法Ⅰ中用氨水吸收燃煤烟气中的SO2转化为NH4HSO3,是利用了SO2的_______性质(选填字母编号)

A.漂白性 B.氧化性 C.还原性 D.酸性氧化物

②方法Ⅱ主要发生了下列反应:

2CO(g)+SO2(g)=== S(g)+2CO2(g) ΔH1=8.0kJ·mol-1

2H2(g) +SO2(g)=== S(g)+2H2O(g) ΔH2=90.4 kJ·mol-1

2CO(g)+O2(g) === 2CO2(g) ΔH3=-566.0 kJ·mol-1

试写出S(g)与O2反应生成SO2的热化学方程式__________________________

答案:

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参考答案:A

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