CAJ | 학술논문

以钾为代表的碱金属元素是引发SCR催化剂中毒的主要来源，通过浸渍法制备钾中毒催化剂，比较钾盐种类和钾盐浓度对催化剂脱硝活性的影响。结果表明，随着钾盐浓度的增加，催化剂比表面积下降，并出现板结现象；在KNO3、K2 SO4和KCl钾盐中，同浓度下KCl造成的催化剂失活最严重。钾中毒对催化剂孔径结构和V2 O5在载体TiO2上的分散度影响不显著；催化剂吸附表面因中毒会有粒子积聚成团，从而增大催化剂表面粗糙度；同时，钾中毒导致催化剂表面酸性位点的毒害，与新鲜催化剂相比，中毒后催化剂表面总酸量下降约62%。
이갑위대표적감금속원소시인발SCR최화제중독적주요래원，통과침지법제비갑중독최화제，비교갑염충류화갑염농도대최화제탈초활성적영향。결과표명，수착갑염농도적증가，최화제비표면적하강，병출현판결현상；재KNO3、K2 SO4화KCl갑염중，동농도하KCl조성적최화제실활최엄중。갑중독대최화제공경결구화V2 O5재재체TiO2상적분산도영향불현저；최화제흡부표면인중독회유입자적취성단，종이증대최화제표면조조도；동시，갑중독도치최화제표면산성위점적독해，여신선최화제상비，중독후최화제표면총산량하강약62%。
Potassium is one of the typical alkali metals which results in catalyst deactivation of SCR system. K-deactivation catalysts were prepared by the impregnation method in this paper. The influence of the kinds and concentrations of sylvite on the activity of SCR catalysts was investigated. The results showed that with the increase of K+ concentration,the specific surface area of the catalysts decreased. The compaction phenomenon of the catalyst appeared. The catalyst deactivation caused by KCl was the most serious under the same concentration of KNO3 ,K2 SO4 and KCl. K-deactivation had no significant impact on the pore structure of the catalyst and the dispersion of V2 O5 on TiO2 carrier. Some particles accumulated on the adsorption surface of the catalyst due to K-deactivation effect which increased the surface roughness of the catalyst. Meanwhile,K-deactivation resulted in the decrease of total amount of surface acid by about 62% on the deactivation catalyst compared with the fresh one.