Investigation of Iron Vanadates for Simultaneous Carbon Soot Abatement and NH3-SCR

Abstract

FeVO 4 and Fe 0.5 Er 0.5 VO 4 were prepared and loaded over standard Selective Catalytic Reduction (SCR) supports based on TiO 2 -WO 3 -SiO 2 (TWS) and redox active supports like CeO 2 and CeZrO 2 with the aim of finding a suitable formulation for simultaneous soot abatement and NH 3 -SCR and to understand the level of interaction between the two reactions. A suitable bi-functional material was identified in the composition FeVO 4 /CeZrO 2 where an SCR active component is added over a redox active support, to increase carbon oxidation properties. The influence of the presence of ammonia in soot oxidation and the effect of the presence of soot on SCR reaction have been addressed. It is found that the addition of NO and NO/NH 3 mixtures decreases at different levels the oxidation temperature of carbon soot, while the presence of carbon adversely affects the NH 3 -SCR reaction by increasing the oxidation of NH 3 to NO, thus lowering the NO removal efficiency.

Destructive Influence of Cement Dust on the Structure and DeNOx Performance of V-Based SCR Catalyst

“…The reducibility of vanadia appears to be deteriorated with the peak temperature shifting to 560 °C, which is probably due to the chemical transformation of monomeric vanadia to less active vanadate species. 44 A new notable peak at 660 °C may be attributed to the reduction of formed tungstate solid solutions after the aging of SCR catalyst with cement dust, which was in accordance with the XPS analysis (shown in Figure 5B). According to the previous reports, the easy oxidation− reduction conversion of active sites such as V 5+ /V 4+ will promote the NH 3 -SCR reaction with high DeNO x efficiency.…”

Understanding of Soot Removal Mechanism over DeNOx-Catalysts as Passive Converters

“…It is remarkable that the systems for NO x and soot elimination analyzed individually are efficient in each technology, and the studies concerning the simultaneous removal are mainly focused on the reduction of the storage capacity due to the presence of soot that competes for the active centers. For SCR materials, few studies involving soot can be found, but the SDPF system is emerging and consists of an NH 3 –SCR catalyst coated onto a wall-flow DPF. − Therefore, the NO x removal catalysts are not real soot combustion materials but can be affected by the presence of soot on the surface since it is not completely reduced in the DOC or DPF device. Soot covers the catalysts and has to be oxidized using the materials as passive converters of soot.…”

Pseudocapacitive Behavioral Testing of Iron Vanadate Nanoparticles Synthesized by Simple Co- Precipitation Method

“…The Fig.1 depicts the powder X-ray diffraction (PXRD) pattern of prepared iron vanadate nanoparticles. The recorded PXRD patterns was matched with JCPDS card number 71-1592 and indexed with hkl planes [11,[9][10][11][12][13][14][15][16][17][18][19][20]. The structure obtained was found to be primitive with cell parameters a=6.719 b=8.060 c=9.254 and α=96.6, β=106.57, γ=101.60.…”

“…In connection with this, iron vanadate has various merits including its availability in nature, low toxicity, chemical stableness and user friendly in fabrication process. A wide variety of iron vanadate had been synthesized and investigated as they possess various application [7][8][9][10][11][12][13][14][15].…”