In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2

Pietrogiacomi, Daniela; Magliano, Alessandro; Sannino, Diana; Campa, Maria Cristina; Ciambelli, Paolo; Indovina, Valerio

doi:10.1016/j.apcatb.2005.02.025

Cited by 35 publications

(24 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering As electronic withdrawing and high content of SO 4 2-and As on the poisoned #1, partial transformation from S=O to S-O-As seems a reasonable explanation. Actually, previous research has been reported that peaks at 1060 cm -1 [49] and 1078 cm -1 [37] are ascribed to bands of S-O complexes. Thus, the weak broad band at 1068 cm -1 tentatively assigned to a S-O-As structure could be reasonable.…”

Section: -mentioning

confidence: 99%

Deactivation mechanism of arsenic and resistance effect of SO42− on commercial catalysts for selective catalytic reduction of NO with NH3

Gao

Deng

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

Arsenic (As) is found to be poisonous to the commercial V 2 O 5 -WO 3 /TiO 2 catalysts for selective catalytic reduction of NOx with NH 3 . The NOx conversion of catalysts declines and N 2 O formation dominates at high temperature (above 300 °C) after As poisoning. A series of activity and characterization experiments are applied to reveal the deactivation mechanism caused by As. Results indicate that doping of As on the catalysts, which exists as H 2 AsO 4 and HAsO 4 2-, doesn't seriously change surface area of catalysts or TiO 2 phase, but greatly decreases both the Lewis and Brønsted acid sites. It is found that V-OH is destroyed and less reactive As-OH is newly formed. V-OH site is crucial to the NH 3 adsorption and its destruction by As contributes to catalyst deactivation. Besides, stronger oxidizability of catalysts that resulted from more surface-active oxygen aroused by As leads to substantial non-selective catalytic reduction reaction and NH 3 oxidation at high temperature.Both of these two aspects result in lower NOx conversion and higher N 2 O formation.However, SO 4 2can provide remarkable surface acidities and the sites that destroyed by As can thus be supplied. Benefited from these new reactive acid sites, catalysts with prominent SO 4 2loading show superior arsenic resistance even with a high As content, which indicate to be a promising anti-poisoning formula. Finally, mechanism of arsenic poisoning and resistance effect of SO 4 2is proposed based on the above analysis.

show abstract

Section: -mentioning

confidence: 99%

Deactivation mechanism of arsenic and resistance effect of SO42− on commercial catalysts for selective catalytic reduction of NO with NH3

Gao

Deng

et al. 2016

Chemical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…Fig. 12 shows the in situ DRIFTS spectra of influence of SO 2 on NO x adsorption on the Fe 0.75 Mn 0.25 TiO x catalyst at 150 • C. After the introduction of SO 2 into the NO + O 2 feeding gas, the surface nitrate species at 1614, 1581, 1554 and 1228 cm −1 quickly disappeared with the increasing of time, replaced by the deposited sulfate species (1363 and 1282 cm −1 for asS O and sS O , 1200, 1144 and 1038 cm −1 for 3 band splits) [38][39][40] and adsorbed H 2 O (ı HOH vibration mode) formed in the sulfation process. After the removal of SO 2 from the feeding gas, the nitrate species did not recover at all, suggesting that the inhibition effect of SO 2 on NO x adsorption on the Fe 0.75 Mn 0.25 TiO x catalyst was intense and irreversible.…”

Section: Influence Of So 2 On Nh 3 /No X Adsorptionmentioning

confidence: 99%

Selective catalytic reduction of NO with NH3 over manganese substituted iron titanate catalyst: Reaction mechanism and H2O/SO2 inhibition mechanism study

Liu

2010

Catalysis Today

198

View full text Add to dashboard Cite

“…Therefore, various studies have been conducted to develop SCR catalysts using ceria . In addition, Cu is also reported to play a vital role in boosting the low temperature activity for the NH 3 ‐SCR . The comprehensive study of CuO‐CeO 2 suggested that finely dispersed CuO species, a smaller particle size of CeO 2 , and strong synergetic interaction between CuO and CeO 2 were found to be favourable for the high activity performance in selective catalytic ammonia oxidation (NH 3 ‐SCO) .…”

Section: Introductionmentioning

confidence: 99%

The effective promotion of trace amount of Cu on Ce/WO₃‐ZrO₂‐TiO₂ monolithic catalyst for the low‐temperature NH₃‐SCR of NO_x

Feng

et al. 2017

Can J Chem Eng

View full text Add to dashboard Cite

The selective catalytic reduction of NOx with NH3 (NH3‐SCR) activity of 0.10 g/g CeO2/WO3‐ZrO2‐TiO2 (Ce/WZT) in low temperature range was greatly enhanced by the addition of 0.00010 g/g Cu (Cu/Ce mass ratio = 1:1000). The temperature of complete NOx conversion (T90) decreased as much as 36 °C (from 263 °C to 227 °C) under a gas hourly space velocity (GHSV) of 30 000 h−1. XPS, NH3/O2‐TPD, H2‐TPR, XRD, and FTIR characterizations revealed that the interaction between Cu and Ce, more active oxygen species, stronger NH3 and NO oxidation ability, better redox ability, together with the abundant Brønsted acid sites contributed to better catalytic activity of 0.00010 g/g Cu‐0.10 g/g Ce/WO3‐ZrO2‐TiO2 (CC/WZT) catalyst at low temperatures.

show abstract

In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2

Cited by 35 publications

References 25 publications

Deactivation mechanism of arsenic and resistance effect of SO42− on commercial catalysts for selective catalytic reduction of NO with NH3

Deactivation mechanism of arsenic and resistance effect of SO42− on commercial catalysts for selective catalytic reduction of NO with NH3

Selective catalytic reduction of NO with NH3 over manganese substituted iron titanate catalyst: Reaction mechanism and H2O/SO2 inhibition mechanism study

The effective promotion of trace amount of Cu on Ce/WO₃‐ZrO₂‐TiO₂ monolithic catalyst for the low‐temperature NH₃‐SCR of NO_x

Contact Info

Product

Resources

About

In situ sulphated CuOx/ZrO2 and CuOx/sulphated-ZrO2 as catalysts for the reduction of NOx with NH3 in the presence of excess O2

Cited by 35 publications

References 25 publications

Deactivation mechanism of arsenic and resistance effect of SO42− on commercial catalysts for selective catalytic reduction of NO with NH3

Deactivation mechanism of arsenic and resistance effect of SO42− on commercial catalysts for selective catalytic reduction of NO with NH3

Selective catalytic reduction of NO with NH3 over manganese substituted iron titanate catalyst: Reaction mechanism and H2O/SO2 inhibition mechanism study

The effective promotion of trace amount of Cu on Ce/WO3‐ZrO2‐TiO2 monolithic catalyst for the low‐temperature NH3‐SCR of NOx

Contact Info

Product

Resources

About

The effective promotion of trace amount of Cu on Ce/WO₃‐ZrO₂‐TiO₂ monolithic catalyst for the low‐temperature NH₃‐SCR of NO_x