New Insights into Excellent Catalytic Performance of the Ce-Modified Catalyst for NO Oxidation

Ding, Xinmei; Qiu, Jing; Liang, Yanli; Zhao, Ming; Wang, Jianli; Chen, Yaoqiang

doi:10.1021/acs.iecr.9b00415

Cited by 16 publications

(15 citation statements)

References 64 publications

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“…The ratios of I D /I F2g are calculated as summarized in Table 1, which can reflect the relative concentration of oxygen vacancies in the catalysts. 38 They increase in the order of octahedrons < cubes < rods, consistent with previous reports. 24,39 The ratios of I D /I F2g suggest that CeMnO x rods and cubes possess more oxygen vacancies in the CeO 2 lattice compared to CeMnO x octahedrons on account of the interaction between Ce and Mn ions.…”

Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 92%

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Zhao

Dong

Han

et al. 2019

Ind. Eng. Chem. Res.

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Catalytic reactions usually proceed on a catalyst surface, and surface properties could be fine-tuned by the catalyst shape and exposed crystal-plane. In the present work, morphology-dependent CeMnO x nanostructures (rods, octahedrons, and cubes) were synthesized via the hydrothermal method, and they exposed special crystal-planes of {111}/{100}/{110}, {111}, and {100} for CeMnO x rods, octahedrons, and cubes, respectively. The best catalytic activity for the catalytic combustion reaction of 1,2dichlorobenzene (o-DCB) whether in dry or wet conditions was observed over CeMnO x rods followed by CeMnO x octahedrons and cubes. The optimum catalytic performance of CeMnO x rods could be associated to its high reducibility and large amounts of oxygen vacancies. An interesting phenomenon was observed on kinetic results that the variation of active energy, reaction rate, and TOF were inconsistent with T 90 , and they could be explained by weak and medium strong acidity, indicating the shape effects of CeMnO x nanostructures.

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Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 92%

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Zhao

Dong

Han

et al. 2019

Ind. Eng. Chem. Res.

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“…260°C due to the co-presence of C 3 H 6 and NO at a high GHSV. The catalytic performance of Pd 1 @HEFO is comparable to Pt/ CeO 2 -SiAlO x regarded as a candidate of diesel oxidation catalyst (DOC) 50 and Pt/CeO 2 40 . Moreover, no obvious deactivation of CO, C 3 H 6 , and NO oxidation can be observed over Pd 1 @HEFO even after 10 h of reaction in Supplementary Fig.…”

Section: Synthesis and Characterizations As Illustrated Inmentioning

confidence: 98%

Entropy-stabilized single-atom Pd catalysts via high-entropy fluorite oxide supports

et al. 2020

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Single-atom catalysts (SACs) have attracted considerable attention in the catalysis community. However, fabricating intrinsically stable SACs on traditional supports (N-doped carbon, metal oxides, etc.) remains a formidable challenge, especially under hightemperature conditions. Here, we report a novel entropy-driven strategy to stabilize Pd single-atom on the high-entropy fluorite oxides (CeZrHfTiLa)O x (HEFO) as the support by a combination of mechanical milling with calcination at 900°C. Characterization results reveal that single Pd atoms are incorporated into HEFO (Pd 1 @HEFO) sublattice by forming stable Pd-O-M bonds (M = Ce/Zr/La). Compared to the traditional support stabilized catalysts such as Pd@CeO 2 , Pd 1 @HEFO affords the improved reducibility of lattice oxygen and the existence of stable Pd-O-M species, thus exhibiting not only higher low-temperature CO oxidation activity but also outstanding resistance to thermal and hydrothermal degradation. This work therefore exemplifies the superiority of high-entropy materials for the preparation of SACs.

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“…The oxidation of NO to NO 2 is also a key step both in the NOx reduction technologies and the nitric acid production. − For example, the NH 3 -SCR reaction rate can be greatly enhanced if a fraction of NO is converted to NO 2 , and the increase of the NO 2 content greatly improves the efficiency of the reduction catalysts and also decreases aging of the catalysts. , Supported catalysts (included noble metals and metal oxides) are widely used in the catalytic oxidation of NO. − However, these oxidation reactions are always conducted at high NO concentrations (up to hundreds ppm) and high temperature (about 423–723 K). − In contrast, it was found that when the NO concentration was low to the ppb level, the heterogeneous reaction of NO on atmospheric particles was slow and supposed to hardly happen. , Therefore, the heterogeneous conversion of NO to NO 2 in the atmospheric chemistry has always been neglected.…”

Section: Introductionmentioning

confidence: 99%

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

Liu

Wang

et al. 2020

Environ. Sci. Technol.

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The NO–NO2 cycle determines the formation of O3 and hence plays a critical role in the oxidizing capacity of troposphere. Traditional view concluded that the heterogeneous oxidation of NO to NO2 was negligible due to the weak reactivity of NO on aerosols, compared to the homogeneous oxidation process. However, the results here reported for the first time that SO2 can greatly promote the heterogeneous transformation of NO into NO2 and HONO on MgO particles under ambient conditions. The uptake coefficients of NO were increased by 2–3 orders of magnitudes on SO2-aged MgO, compared to the fresh sample. Based on spectroscopic characterization and density functional theory (DFT) calculations, the active sites for the adsorption and oxidation of NO were determined to be sulfates, where an intermediate [SO4–NO] complex was formed during the adsorption. The decomposition of this species led to the formation of NO2 and the change of sulfate configuration. The formed NO2 could further react with surface sulfite to form HONO and sulfate. The conversion of NO to NO2 and HONO on the SO2-aged MgO surface under ambient conditions contributes a new formation pathway of NO2 and HONO and could be quite helpful for understanding the source of atmospheric oxidizing capacity as well as the formation of air pollution complexes in polluted regions such as the northern China.

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New Insights into Excellent Catalytic Performance of the Ce-Modified Catalyst for NO Oxidation

Cited by 16 publications

References 64 publications

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Entropy-stabilized single-atom Pd catalysts via high-entropy fluorite oxide supports

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions

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New Insights into Excellent Catalytic Performance of the Ce-Modified Catalyst for NO Oxidation

Cited by 16 publications

References 64 publications

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnOx Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnOx Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Entropy-stabilized single-atom Pd catalysts via high-entropy fluorite oxide supports

Efficient Conversion of NO to NO2 on SO2-Aged MgO under Atmospheric Conditions

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Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Study of Morphology-Dependent and Crystal-Plane Effects of CeMnO_x Catalysts for 1,2-Dichlorobenzene Catalytic Elimination

Efficient Conversion of NO to NO₂ on SO₂-Aged MgO under Atmospheric Conditions