Insights into the catalytic behavior of LaMnO3 perovskite for Hg0 oxidation by HCl

Wang, Zhen; Liu, Jing; Yang, Yingju; Yu, Yingni; Yan, Xuchen; Zhang, Zhen

doi:10.1016/j.jhazmat.2019.121156

Cited by 90 publications

(26 citation statements)

References 42 publications

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“…Under the NH 3 -SCR reaction condition, LaMnO 3 is in an orthorhombic unit cell with the Pnma space group . The LaMnO 3 perovskite oxide (110) surface was presented by a (1 × 1) unit cell slab model with nine layers, Mn-terminated, and a vacuum gap of 15 Å, as shown in Figure a (denoted as Mn-ter).…”

Section: Resultsmentioning

confidence: 99%

“…Under the NH 3 -SCR reaction condition, LaMnO 3 is in an orthorhombic unit cell with the Pnma space group. 60 The LaMnO 3 perovskite oxide (110) surface was presented by a (1 × 1) unit cell slab model with nine layers, Mn-terminated, and a vacuum gap of 15 Å, as shown in Figure 14a (denoted as Mn-ter). Two kinds of Kdoped surfaces were built by replacing one and two La atoms in the sublayers with K atoms in the Mn-ter models, respectively.…”

Section: Sem Image Resultsmentioning

confidence: 99%

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3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

Zheng

Liu

et al. 2021

J. Phys. Chem. C

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Diesel engines have been widely applied, while the pollutants emitted from diesel engines have caused serious environmental pollution and human health hazards, especially for soot and NO x . Nowadays, the design and preparation of catalysts with excellent catalytic activity for simultaneous removal of soot and NO x is a great challenge in the field of diesel exhaust abatement. In this work, a series of three-dimensional ordered macroporous (3DOM) La1–x K x MnO3 catalysts with high activity for the simultaneous elimination of soot and NO x were synthesized by the colloidal crystal template method. The physicochemical properties of the as-prepared catalysts were characterized via XRD, Raman, FT-IR, SEM, TEM, N2 adsorption–desorption, XPS, H2-TPR, O2-TPD, NH3-TPD, NO-TPD, NO-TPO, and so on. The results of catalytic performance illustrated that 3DOM La0.75K0.25MnO3 exhibited highest catalytic activity with a maximum concentration of CO2 at 357 °C (T 10 = 336 °C, T 50 = 365 °C, and T 90 = 406 °C) and 50–60% NO conversion in the temperature range of 140–260 °C. Meanwhile, the reaction mechanism of 3DOM La1–x K x MnO3 catalysts was also proposed based on the characterization results and DFT calculation. The reasons for high catalytic activity are related to the strong oxidizability of high-valence B-site ions, the abundance of active oxygen species and suitable acid sites, good reducibility, and the 3DOM structure.

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Section: Resultsmentioning

confidence: 99%

Section: Sem Image Resultsmentioning

confidence: 99%

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

Zheng

Liu

et al. 2021

J. Phys. Chem. C

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“…Therefore, our previous work synthesized copper-manganese spinel-type oxide and used to remove Hg 0 from simulated flue gas (4% O 2 + 12% CO 2 + N 2 ) [35][36][37]. HCl usually exists in flue gas, and has a great influence on the mercury transformation [38]. However, to date, no relevant research has been reported to investigate the effects of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent.…”

Section: Introductionmentioning

confidence: 99%

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

Zhang¹,

Yang²,

Jing³

et al. 2022

Energy Engineering

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CuMn 2 O 4 spinel has been regarded as a highly efficient sorbent for Hg 0 capture from flue gas. The regenerability and recyclability of CuMn 2 O 4 sorbent are mainly associated with the mercury speciation adsorbed on its surface. However, the effect mechanism of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent is still elusive. Experiments were conducted to understand the effect of HCl on Hg 0 transformation over CuMn 2 O 4 sorbent. The results indicate that CuMn 2 O 4 sorbent is a mesoporous material and possesses a good thermal stability. CuMn 2 O 4 shows >95% Hg 0 removal efficiency in a wide temperature window of 50-350 • C. The favorable electron-transfer environment caused by the mixed valence states of Cu and Mn cations is responsible for the excellent Hg 0 removal performance of CuMn 2 O 4 sorbent. CuMn 2 O 4 shows a higher Hg 0 adsorption capacity of 4774.57 μg/g. Hg 0 adsorption process over CuMn 2 O 4 sorbent can be well described by the developed kinetic model. Hg 0 removal efficiency of CuMn 2 O 4 sorbent does not depend on the presence of HCl. Mercury species adsorbed on the CuMn 2 O 4 sorbent in the presence of HCl mainly exist in the forms of HgO and HgCl 2 O 8 • H 2 O. HCl shows a significant effect on mercury speciation over CuMn 2 O 4 sorbent. Most of HgO species will be transformed into HgCl 2 O 8 • H 2 O in the presence of HCl.

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“…In the literature, different metal combinations have been developed for the preparation of perovskite structures for specific applications [18][19][20][21][22][23][24][25][26][27]. Additionally, perovskites have been successfully employed in various technological applications, such as catalysts [18][19][20], photocatalysts [28,29], water splitting [30][31][32], supercapacitor [33][34][35], chemical reductions/removal [36][37][38], solar cells [39][40][41], gas sensing [42][43][44], and chemical sensing device development [45][46][47][48][49][50]. Karuppiah et al fabricated graphene nanosheet-wrapped mesoporous LaCeFeMnO 3 perovskite for lithium battery applications [51].…”

Section: Introductionmentioning

confidence: 99%

Perovskite Nanoparticles as an Electrochemical Sensing Platform for Detection of Warfarin

Ansari

Alam

2022

Biosensors

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Chemically prepared PrAlO3 perovskite nanoparticles (NPs) were applied for the electrochemical detection of warfarin, which is commonly utilized for preventing blood clots, such as in deep vein thrombosis. PrAlO3 perovskite NPs were synthesized by the co-precipitation process at environmental conditions. Crystallographic structure, phase purity, morphological structure, thermal stability, optical properties, and electrochemical characteristics were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, UV-visible analysis, and cyclic voltammetry techniques. TEM micrographs showed the highly crystalline structure, smooth surface, irregular shape, and size of nanocrystalline particles with an average size of 20–30 nm. Particularly crystalline perovskite NPs were pasted on glassy carbon electrodes (GCE) to electrochemically detect the warfarin contents in liquid samples. The fabricated electrode was electrochemically characterized by different parameters such as different potential, scan rates, same potential with seven consecutive cycles, time response, real-time sample analysis, and as a function of warfarin concentration in phosphate buffer solution (0.1 M PBS, pH 7.2). The electrochemical electrode was further verified with various potentials of 5, 10, 20, 50, 100, and 150 mV/s, which exhibited sequential enhancements in the potential range. For detecting warfarin over a wide concentration range (19.5 µM–5000 µM), the detection devices offered good sensitivity and a low limit of detection (19.5 µM). The time-dependent influence was examined using chronoamperometry (perovskite NPs/GCE) in the absence and presence of warfarin at four distinct voltages of +0.05 to +1.2 V from 0 to 1000 s. The repeatability and reliability of the constructed electrochemical sensing electrode were also evaluated in terms of cyclic response for 30 days, demonstrating that it is substantially more reliable for a longer period. The fabricated perovskite NPs/GCE electrodes could be employed for the rapid identification of other drugs.

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Insights into the catalytic behavior of LaMnO3 perovskite for Hg0 oxidation by HCl

Cited by 90 publications

References 42 publications

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

Perovskite Nanoparticles as an Electrochemical Sensing Platform for Detection of Warfarin

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Insights into the catalytic behavior of LaMnO3 perovskite for Hg0 oxidation by HCl

Cited by 90 publications

References 42 publications

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NOx from Diesel Engines

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NOx from Diesel Engines

HCl-Induced Hg0 Transformation over CuMn2O4 Sorbent

Perovskite Nanoparticles as an Electrochemical Sensing Platform for Detection of Warfarin

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3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines

3DOM Mn-Based Perovskite Catalysts Modified by Potassium: Facile Synthesis and Excellent Catalytic Performance for Simultaneous Catalytic Elimination of Soot and NO_x from Diesel Engines