The poisoning effect of PbO on Mn-Ce/TiO2 catalyst for selective catalytic reduction of NO with NH3 at low temperature

Zhou, Lingling; Li, Caiting; Zhao, Lingkui; Zeng, Guangming; Gao, Lei; Wang, Yan; Yu, Ming’e

doi:10.1016/j.apsusc.2016.07.136

Cited by 70 publications

(21 citation statements)

References 54 publications

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“…From the characterization experiments, the redox ability of Zn-Mn/ TiO 2 and Pb-Mn/TiO 2 was found to be decreased because of the drop of Mn 4+ and chemisorbed oxygen. Zhou et al 170 investigated the deactivation effects of lead(II) oxide (PbO) on the Mn-Ce/TiO 2 catalyst. It was proposed that the surface area, the concentration of Mn 4+ , Ce 3+ and chemisorbed oxygen was decreased aer introducing PbO.…”

Section: Heavy Metal Ionsmentioning

confidence: 99%

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

et al. 2017

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Section: Heavy Metal Ionsmentioning

confidence: 99%

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

et al. 2017

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“…138.9 and 143.8 eV, which are ascribed to Pb 4f 7/2 and Pb 4f 5/2 of PbO, respectively. 46 , 47 In addition, the peaks ascribed to Pb 2 O 3 and/or PbO 2 cannot be identified from all Zn/Al/Pb catalysts even for Zn/Al/Pb10 containing the highest content of Pb, 46 implying that all Pb ions are in the form of PbO. For comparison, a couple of new strong peaks at 137.4 and 142.2 eV attributed to PbO 2 can be identified for pure PbO, 47 suggesting that the surface of pure PbO is almost completely oxidized to PbO 2 .…”

Section: Resultsmentioning

confidence: 99%

Zn/Al/Pb Mixed Oxides as Efficient Heterogeneous Catalysts for the Synthesis of Methyl N-Phenyl Carbamate

et al. 2020

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Dimethyl carbonate aminolysis is an effective and green pathway for the synthesis of methyl N -phenyl carbamate (MPC), which is an important intermediate for the synthesis of polyurethanes and many other chemicals. In this work, we demonstrate the fabrication of Zn/Al/Pb mixed oxides as efficient and stable heterogeneous catalysts for MPC synthesis. The catalysts are prepared via facile coprecipitation and subsequent thermal annealing. Their micromorphology and physical–chemical properties are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning TEM (STEM), X-ray photoelectron spectroscopy (XPS), and NH 3 -TPD. The results show that rather than being doped into ZnO and/or Al 2 O 3 , PbO is highly dispersed in the ZnO/Al 2 O 3 base forming ultrafine nanoparticles. Despite the weak interactions within the mixed oxides, the high density of active sites generates outstanding catalytic activity and cycling stability for MPC synthesis, with an aniline conversion of almost 100% and MPC yield of up to 90% during six repeated tests, providing great potential for their further application.

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“…In the E-R mechanism, MnO 2 was reduced to Mn 2 O 3 and provided the chemisorption oxygen (O α ) (Equation 2) and it was a crucial step for the SCR reaction process. Besides, MnO 2 promoted the conversion rate of NO to NO 2 (Equation (7)) in the "fast SCR" reaction [9,22].…”

Section: Discussionmentioning

confidence: 99%

“…More importantly, the peak of Mn 2 O 3 could be detected on CaO poisoning catalyst surface, indicating that part of MnO 2 in AC surface was converted to Mn 2 O 3 . MnO 2 participated in a main catalytic role and promoted the conversion rate of NO to NO 2 [21,22]. The decrease of MnO 2 would definitely cause the reduction of the SCR performance for the catalyst.…”

Section: Sem Analysismentioning

confidence: 99%

“…Mn 4+ had the higher NO removal efficiency and redox ability compared with Mn 3+ in the form of Mn 2 O 3 [25,26]. Manganese dioxide also promoted the conversion of NO to NO 2 and the generation of active intermediate [22,27], which is beneficial to SCR reaction. So, loading CaO changed the manganese phase on AC surface and decreased the Mn 4+ concentration.…”

Section: Xps Analysismentioning

confidence: 99%

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Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

Ren

Chen

et al. 2020

Catalysts

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In this study, the poisoning effect of CaO on activated carbon (AC)-based Mn-Ce catalysts was discussed. Loading CaO inhibited the catalytic activity of the catalyst and the NO conversion of the catalyst decreased from 69.5% to 38.2% at 75 °C. The amount of MnO2 in AC surface decreased in the process of loading CaO, which was detrimental to the Selective Catalytic Reduction (SCR) performance of the catalyst. The change of manganese oxide form inhibited generation rate for the chemisorption oxygen and NO2, which was the most critical reason for the decrease of catalytic activity. Besides, loaded CaO entered into the pores of the catalyst, which led to the blockage of the pores and further resulted in the decrease of the Brunauer-Emmett-Teller (BET) surface area and total pore volume. It also destroyed the oxygen-containing functional groups and acid site on the surface of AC. All of these caused the deactivation of Mn-Ce/AC catalyst after loading CaO.

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The poisoning effect of PbO on Mn-Ce/TiO2 catalyst for selective catalytic reduction of NO with NH3 at low temperature

Cited by 70 publications

References 54 publications

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

Zn/Al/Pb Mixed Oxides as Efficient Heterogeneous Catalysts for the Synthesis of Methyl N-Phenyl Carbamate

Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

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The poisoning effect of PbO on Mn-Ce/TiO2 catalyst for selective catalytic reduction of NO with NH3 at low temperature

Cited by 70 publications

References 54 publications

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NOx with NH3: reaction mechanism and catalyst deactivation

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NOx with NH3: reaction mechanism and catalyst deactivation

Zn/Al/Pb Mixed Oxides as Efficient Heterogeneous Catalysts for the Synthesis of Methyl N-Phenyl Carbamate

Deactivation Effect of CaO on Mn-Ce/AC Catalyst for SCR of NO with NH3 at Low Temperature

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A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation

A review of Mn-containing oxide catalysts for low temperature selective catalytic reduction of NO_x with NH₃: reaction mechanism and catalyst deactivation