Seven Modern Trends in the DeNOx Catalyst Development

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

“…According to Mytareva et al (2021) one of the new trends in the development of catalysts to reduce NO x is to increase efficiency at low temperatures. As has been well demonstrated, the highest catalytic performance of TM/Z catalysts is achieved in the temperature range of 300-450°C, with NO x conversion higher than 60% and N 2 selectivity around 70%.…”

Hollow @CuMgAl double layered hydrotalcites and mixed oxides with tunable textural and structural properties, and thus enhanced NH3-NOx-SCR activity

“…NO x is primarily made up of nitric oxide (NO) and nitrogen dioxide (NO 2 ) and belongs to a signicant group of air pollutants which have a number of negative impacts on human health and the environment, including e.g., photochemical smog, ozone depletion and acid rain. 1 The anthropogenic emission of NO x originates mainly from the stationary combustion of fossil fuels, such as that found in steel plants, power plants, cement plants and waste incineration. NO x emissions also originate from mobile sources, with a major contribution from the use of diesel engines.…”

“…1 Therefore, mixed oxides (MOs) originating from layered double hydroxides (LDHs) with different combinations of metal ions have been successfully tested as SCR catalysts since the late 1990s. 1 Such great interest in this class of materials is related to their unique properties, such as having excellent and uniform metal oxide dispersions, high thermal stabilities and memory effects. Moreover, their properties and surface compositions can be easily tuned during the synthesis, their preparation methods are well known, and they are environmentally friendly materials that are relatively cheap to produce.…”

“…[13][14][15] However, synthesis of multicomponent oxide catalysts by traditional preparation methods, e.g., coprecipitation, hydrothermal synthesis and solgel methods, oen leads to a heterogeneous distribution of the active components, as well as agglomeration and sintering of particles, which may signicantly limit the potential of these catalysts for practical applications. 1 Therefore, mixed oxides (MOs) originating from layered double hydroxides (LDHs) with different combinations of metal ions have been successfully tested as SCR catalysts since the late 1990s. 1 Such great interest in this class of materials is related to their unique properties, such as having excellent and uniform metal oxide dispersions, high thermal stabilities and memory effects.…”

Theoretical Studies on the Mechanism of deNOx Process in Cu–Zn Bimetallic System—Comparison of FAU and MFI Zeolites

“…Recently, various zeolites have been studied for their effectiveness [ 16 , 22 , 23 ]. Experiments to combine transition metals with zeolites have led to the design of catalysts having higher efficiency, thermal resistance and also increased tolerance to sulfur poisoning [ 24 , 25 , 26 ].…”