Mechanism of arsenic poisoning on SCR catalyst of CeW/Ti and its novel efficient regeneration method with hydrogen

Li, Xiang; Li, Junhua; Peng, Yue; Chang, Huazhen; Zhang, Tao; Zhao, Shen; Si, Wenzhe; Hao, Jiming

doi:10.1016/j.apcatb.2015.11.042

Cited by 161 publications

(80 citation statements)

References 50 publications

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“…Two desorption peaks spanning the temperature range from 100 to 500 °C can be observed on both samples. One (< 300 °C) represented weak acid, the other (> 300 °C) could be attributed to strong acid . It was noticeable that the addition of Cu not only led to a shift of the weak acid position towards a lower temperature by about 21 °C, but also obviously increased the peak area of weak acid.…”

Section: Resultsmentioning

confidence: 97%

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

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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.

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Section: Resultsmentioning

confidence: 97%

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

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“…The induced crystallization results from the bonding mechanisms. As the bond length of As—Se being 2.73 Å is larger than the bond length of Au—Se, which exhibits the value of 2.43 Å with the ionic radius of gold (82 pm) being larger than that of As (58 pm), the induced crystallization processes are actualized through bonding of excess Se atoms with Au to form Au 2 Se 3 at the ultrathin interface. As 2 Se 3 thin films coated onto ITO substrates were observed to exhibit induced crystallization by the As vacancy filling.…”

Section: Resultsmentioning

confidence: 97%

Characterization of Au/As₂Se₃ Multifunctional Tunneling Devices

Qasrawi

2020

Physica Status Solidi (a)

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Herein, the physical design and characterization of the Au/As2Se3 Schottky barrier that is prepared under a vacuum pressure of 10−5 mbar are reported. The Schottky diodes are characterized by means of X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, current–voltage characteristics, and conductivity, capacitance, and impedance spectroscopy. It is observed that the Schottky barriers exhibit a biasing‐dependent large rectification ratio with current conduction mechanisms dominated by the electric field‐assisted quantum mechanical tunneling through a barrier height of 0.29 eV and depletion width of 13.3 nm. While the spectral analysis of the alternating current (AC) conductivity reveals mixed conduction with the contribution of both of the tunneling and correlated barriers hopping mechanisms, the capacitance spectra display resonance–antiresonance phenomena at 0.201 GHz. A wide range (0.21–1.80 GHz) of negative capacitance (NC) effects is observed in devices. In addition, the impedance spectroscopy analyses show that the Au/As2Se3 devices exhibit band‐stop features with a notch frequency of 1.14 GHz and return loss value of 16 dB. The NC effect, resonance–antiresonance, filtering features, as well as the high rectification ratio at a relatively low biasing voltage (≈0.30 V) nominate the Au/As2Se3 devices for applications which require noise reduction, parasitic effect cancellations, and microwave filtering.

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“…It was understood that Ce species existed mainly in the oxidation state of Ce 4+ on the surface and the Mo deposition resulted in the formation of more Ce 3+ , enhancing the redox cycle between Ce 4+ and Ce 3+ . It was reported that the higher ratio of Ce 3+ on the surface generated a charge imbalance, oxygen vacancies and unsaturated chemical bonds to promote NO x oxidation and to facilitate faster SCR . Moreover, an oxygen bridge (Metal‐O‐Metal) formed between two redox metals facilitated the redox cycle.…”

Section: Resultsmentioning

confidence: 99%

“…The NO x conversion rate (X NO , %) and the N 2 selectivity rate (S N2 , %) were attained by the following Eq. (1) and (2)

X_{NO} = \frac{{NO}_{in} - {NO}_{out}}{{NO}_{in}} \times 100 %

S_{{normalN}_{2}} = 1 - \frac{2 {[{normalN}_{2} O]}_{out}}{{[NO]}_{in} + {[{NH}_{3}]}_{in} - {[{NO}_{2}]}_{out} - {[NO]}_{out} - {[{NH}_{3}]}_{out}} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

“…It was reported that the higher ratio of Ce 3+ on the surface generated a charge imbalance, oxygen vacancies and unsaturated chemical bonds to promote NO x oxidation and to facilitate faster SCR. 18 Moreover, an oxygen bridge (Metal-O-Metal) formed between two redox metals facilitated the redox cycle. In the MnO x and CeO x mixture, the oxidation of Mn 3+ to Mn 4+ was enhanced by Ce 4+ meanwhile the Ce 4+ was reduced to Ce 3+ , reaching a redox equilibrium of Mn 3+ + Ce 4+ ↔ Mn 4+ + Ce 3+ .…”

Section: Characterizations and Reaction Mechanism Of The Mo Modified mentioning

confidence: 99%

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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Background Selective catalytic reduction of nitrogen oxides with ammonia (NH3‐SCR) is an effective method for the nitrogen oxides (NOx) removal. This study aimed to develop a highly efficient NH3‐SCR catalyst using the naturally available Montmonrillonite (Mt) clay as the catalyst support. Results Mt was processed into PILC by Al/Zr intercalations, impregnated with MnCe mixed active components and loaded with transition metals to achieve X‐AlZr‐PILC‐MnCe (X = V, W, Co or Mo) catalysts. The optimized Mo‐AlZr‐PILC‐MnCe showed the best NH3‐SCR performance with a NO conversion rate of nearly 100% in the temperature range of 240–300 °C, and N2 selectivity of above 85% in the range of 140–300 °C. Conclusions The catalysts were characterized by SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD to define the relationships between structure, chemical properties and catalytic activity. The enhanced catalytic performance of Mo‐AlZr‐PILC‐MnCe was mainly owing to the increased acidity and better redox ability. In situ DRIFT studies indicated the deposition of Mo changed the reaction from the E‐R to the L‐H mechanism. © 2020 Society of Chemical Industry

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Mechanism of arsenic poisoning on SCR catalyst of CeW/Ti and its novel efficient regeneration method with hydrogen

Cited by 161 publications

References 50 publications

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

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

Characterization of Au/As₂Se₃ Multifunctional Tunneling Devices

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

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Mechanism of arsenic poisoning on SCR catalyst of CeW/Ti and its novel efficient regeneration method with hydrogen

Cited by 161 publications

References 50 publications

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

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

Characterization of Au/As2Se3 Multifunctional Tunneling Devices

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

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

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

Characterization of Au/As₂Se₃ Multifunctional Tunneling Devices

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR