期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 54, 期 14, 页码 9132-9141出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c03290
关键词
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资金
- National Natural Science Foundation of China [21722704, 21976117, 21906102, 21773152]
- National Key R&D Program of China [2017YFE0132400]
- Science and Technology Commission of Shanghai Municipality [19DZ2293100, 18DZ2281400]
- Shanghai Sailing Program [19YF1415300]
- China Postdoctoral Science Foundation [2018M630426]
At present, the deactivation of selective catalytic reduction (SCR) catalysts caused by the coexistence of alkali metal and phosphorus (P) remains an urgent problem and lacks corresponding strategies against catalyst poisoning. Herein, a novel zeolite-like Ce-Si5Al2Ox catalyst derived from an ultrasmall nanozeolite EMT precursor was synthesized without organic templates at ambient temperature. This catalyst was able to maintain above 95% NOx conversion in the 270-540 degrees C temperature range. Moreover, 1 wt % potassium (K) and 5 wt % P loading had no influence on the SCR performance of the Ce-Si5Al2Ox catalyst at 300-480 degrees C. It was demonstrated that cerium (Ce) was highly dispersed in the amorphous aluminum (Al) silicate derived from EMT zeolites and expressed high catalytic performance. Besides, a large number of acid sites were reserved to absorb ammonia allowing effective participation in the SCR reaction and capturing alkali metals, thus improving the SCR performance and K resistance. Additionally, the strong interaction between Ce and aluminosilicate decreased cerium phosphate production, preventing deactivation of the catalysts. Thus, this novel low-cost zeolite-like Ce-Si5Al2Ox catalyst with a highly active ion-exchanged metal phase and abundant surface acid sites paves a way for designing new efficient and poisoning-resistant SCR catalysts for practical applications.
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