Hydrotalcite-like compounds are a class of anionic lays or layed double hydroxiods (LDHs) which consists of alkalescence, anion-exchanges and memory effect. The synthetic methods of LDHs include coprecipitation, hydrothermal synthesis, mirowave radiation, ion exchange, sol-gel method, roasting reduction method, instant synthesis, etc.The molar ratio of raw materials, pH value,reaction temperature,reaction time and so on have a greater impact on the purity and crystallinity of the LDHs.
This paper reviews various catalysts for removal of NOx in SCR,including noble metals,zeolites,metal oxides and so on.These traditional catalysts do not have excellent properties in all aspects such as catalytic activity, thermal stability and resistance against poisoning,so they can hardly be commercialized.However,composite type catalysts and storage-reduction catalyst for removal NOx overcome the above disadvantages of traditional catalysts and have promising prospects.
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