Impact of sulfur oxide on NH3-SCR over Cu-SAPO-34

A multi-site kinetic model for NH3-SCR over Cu/SSZ-13

“…A detailed description of the procedure for washcoating can be found in Wijayanti et al [46]. In order to improve the attachment of the zeolite layer, a thin alumina layer was first applied (67 mg), which was followed by zeolite coating (780 mg), including 5% boehmite as a binder.…”

“…The experimental setup has been described in earlier publications [41,46]. The catalyst powder (50 mg) was placed on a sintered quarts plate inside a quarts reactor.…”

“…A flow reactor was used to measure the activity and selectivity and this system is described in more detail in [46]. Briefly, the gases were mixed using multiple mass-flow controllers and the gas received was flown over the monolith catalyst, which was placed in a horizontal quarts tube.…”

Comparison of Cu/BEA, Cu/SSZ-13 and Cu/SAPO-34 for ammonia-SCR reactions

“…Earlier, Cu/BEA and Cu/ZSM-5 were intensively studied but recently, it has been shown that small-pore zeolites and silicoaluminophosphates (SAPO-n) exhibit superior durability during hydrothermal aging conditions [3][4][5]. Most of these recent studies have been focusing on Cu/SSZ-13 [6] and Cu/SAPO-34 [7,8], which are both of the chabazite structure, but have different elemental compositions. Cu/SAPO-34, in particular, is capable of withstanding higher aging temperatures than Cu/SSZ-13 [9,10].…”

Study on NOx emissions from a national V heavy-duty diesel engine

“…NO 2 emissions of 2200 r/min has an average decreased by 90.9% and biggest decreased by 92.3%. The main reason is that NH 3 -based SCR have different reaction under different conditions [15][16][17] : standard SCR reaction and rapid SCR reaction. Standard SCR reaction is mainly catalytic reduction reaction between NH 3 and NOx, it has higher rate of reaction at 300 ℃ ~ 400 ℃, reaction rate will lower when the temperature is lower, the reaction is as follows:…”