Promotional effect of Mn modification on DeNOx performance of Fe/nickel foam catalyst at low temperature

Heavy metal poisoning resistance of a Co-modified 3Mn10Fe/Ni low-temperature SCR deNOx catalyst

“…The preparation of catalyst The 3Mn10Fe/Ni catalyst was prepared using the method described by our previous research (Zi et al 2019), which was marked as fresh. The Pb-or Zn-poisoned catalysts and Comodified poisoned catalysts were also prepared by the similar method.…”

“…For example, the stability of NH 3 -SCR for iron-based catalysts is good when water vapor is present (Sun et al 2001). Therefore, the combination of Mn-Fe oxides, such as the 3Mn10Fe/Ni catalyst, has a higher SCR deNO x activity at low temperature (Zi et al 2019). However, how heavy metals affect the deNO x performance of the 3Mn10Fe/Ni catalyst is still unknown.…”

Remarkable Enhancement In The N2- Selectivity of NH3-SCR Over The CeNb3Fe0.3/TiO2 Catalyst In The Presence of Chlorobenzene

“…Nevertheless, after the addition of Fe, the total amount desorbed ammonia (A total ) decreased slightly, and the ammonia desorption peak corresponding to the strong acid site at high temperature (T 3 ) shifted to a low temperature range. This phenomenon indicated that the addition of Fe leads to the partial destruction or occupation of a part of the acid sites on the CeNb 3 /TiO 2 catalyst, as well as to the transformation of some strong acid sites to intermediate acid sites (Zi et al 2019). This may result from that the introduction of Fe can improve the redox ability of the catalyst slightly, and lowmedium acid can effectively promote the adsorption process (Liu et al 2016, Shu et al 2020.…”

A Review of Urea Pyrolysis to Produce NH3 Used for NOx Removal

“…With the sustained combustion of fossil fuels in boilers and diesel vehicles, massive harmful emissions of nitrogen oxides (NO x ), mainly including NO and NO 2 , have been discharged into the atmosphere [1][2][3][4][5]. In recent decades, widespread serious environmental problems, such as urban smog, acid rain, and ozone depletion, have been caused from it [5][6][7]. To reduce the severe NO x emission, a number of techniques have been developed and utilized up to now, and the selective catalytic reduction (SCR) and the selective noncatalytic reduction (SNCR) stand out on account of the high denitration efficiency [8][9][10].…”

“…ese side reactions include the generation of macromolecular byproducts such as biuret and cyanuric acid, which leads to reduction of NH 3 production. e product of urea decomposition HNCO reacts with intact urea to produce biuret (5), and a small amount of HNCO can react with biuret to produce cyanuric acid (6) [23]: NH 2 CONH 2 + HNCO ⟶ NH 2 CONHCONH 2 (biuret) (5) NH 2 CONHCONH 2 + HNCO ⟶ CYA(cyanuric acid) + NH 3 (6) erefore, the systematic study on urea pyrolysis mechanism and the methods to improve the reaction rate of (4) have been deeply focused on, in order to promote the NH 3 production efficiency for NO x removal [17,[24][25][26]. In this paper, a review of urea pyrolysis is presented to summarize related studies.…”