Diesel vehicle exhaust is one of the main sources of nitrogen oxides(NOx)in the atmosphere,and selective cat-alytic reduction of NH3(NH3-SCR)is the most mature technical means to remove NOx from mobile sources.In the past dec-ade,metal-based molecular sieve catalysts have become the focus of NOx removal catalysts in diesel vehicle exhaust due to their advantages of wider activity temperature window and better thermal stability,among which,Cu-based small-pore molec-ular sieve catalysts have already been commercially applied.However,the increasingly stringent NOx emission standards have put forward higher requirements on the performance of denitrification catalysts in terms of low-temperature activity,hydrothermal stability,and resistance to toxicity.Therefore,many scholars have conducted more in-depth research on the catalytic mechanism and improvement strategy of molecular sieve catalysts,and good progress has been achieved.In this paper,the research progress of molecular sieve NH3-SCR catalysts is reviewed from the aspects of reaction mechanism,low-temperature activity,hydrothermal stability,poisoning and anti-poisoning strategy,and its application prospect is prospected,aiming to provide theoretical guidance for the development of high-performance molecular sieve denitrification catalysts.
关键词
选择性催化还原/分子筛/反应活性/水热稳定性/中毒及抗中毒
Key words
selective catalytic reduction/molecular sieves/reactivity/hydrothermal stability/poisoning and anti-poisoning
维普
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