摘要
采用拟薄水铝石制备-γA l2O3,经SO42-改性和添加助剂La,再负载上Cu2+,制备了用于富氧条件下丙烯选择还原NO的金属氧化物催化剂。实验结果表明,经SO42-改性后,催化剂活性有了大幅度的提高,能使NO的转化率提高约30%,达到79.9%;助剂La的引入进一步提高了催化剂的活性和热稳定性;在SO42-用量w(SO42-)为30%、采用分步浸渍法引入w(La)=2%、负载上w(Cu2+)=3%的条件下,制得的催化剂的活性最好,在300℃时能使NO的转化率高达83.7%,在500℃还能使NO的转化率为30.9%。
γ-Al2O3 was prepared from pseudo-boehmite and then modified by SO^- and loaded with La and Cu^2＋ to obtain a metal oxide catalyst that is used for the selective reduction of NO with propylene in the presence of excess oxygen. Experimental results showed that the conversion rate of NO was remarkably improved to 79.9% which is about 30% higher than that for the catalyst without modification of SO^2-4. Moreover,it was found that addition of La could further improve the activity and thermal stability of the catalyst. Optimum activity was achieved for the catalyst in which the accession of SO^2-4 was 30% ,and w （La） = 2% and w（ Cu^2＋） = 3% were introduced by stepwise impregnation method. A conversion rate as high as 83.7% has been achieved at 300 ℃, and even at 500 ℃ the conversion rate remained to be 30.9%.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2005年第9期678-680,共3页
Fine Chemicals
基金
广东省科技计划项目(2003C33004)
汕头大学研究与发展项目(130-512042)资助~~
