Core-shell Ag-Pd nanoparticles catalysts for efficient NO reduction by formic acid

Liu, Shihao; Guo, Xuehua; Wang, Zhanke; Hu, Zirui; Wang, Haoqiang; Zhang, Guangxu

doi:10.1016/j.colsurfa.2021.127115

Cited by 8 publications

(9 citation statements)

References 35 publications

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“…It can be concluded that increasing the concentration of reducing agent would promote the denitrification process, but excessive reducing agents also caused the reaction to proceed in the over-reduction direction (generating ammonia). Thus, the amount of reductant should be 5 mL …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, to investigate the apparent activation energy ( E a) of the reaction, experiments at different temperatures were carried out. It is assumed that the reaction also follows the first-order reaction kinetic model . Thus, , where K is the reaction rate constant.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, the concentration of Fe(II)EDTA-NO solution was calculated using an ultraviolet spectrophotometer. As shown in Figure S1a, the standard curve is y = 0.4574 x – 0.0325 and R 2 = 0.9996, where y is the concentration (mmol/L) and x is the absorbance. , …”

Section: Experimental Sectionmentioning

confidence: 99%

“…Herein, to achieve the regeneration of complex solution without introducing new ions into the complex solution, we first report the use of Pd nanoparticles (NPs) as a catalyst to reduce the denitrification of complex solution by formic acid (FA). , FA was oxidized to CO 2 , NO(aq) was reduced to N 2 , and the complex solution can obtain the ability to adsorb NO again. − Furthermore, higher activity and selectivity were obtained by the selection of N-doped porous carbons (NPCs) as the support. − Different from activated carbon (AC), the dispersion, particle size, and binding stability of Pd NPs (2.31 ± 0.43 nm) were improved by the interaction between Pd and N atoms in NPCs. − Fe(II)EDTA was used as the chelating agent because of its cheap price and simple preparation . As expected, at an Fe(II)EDTA-NO concentration of 30 mmol/L, the denitrification rate reached 90.4% with an N 2 selectivity of 99.6% within 5 min.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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N-Doped Porous Carbon-Anchored Pd Nanoparticles: A Highly Efficient Catalyst for Fe(II)EDTA-NO Reduction

et al. 2021

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Complex absorption is considered an efficient method to reduce the emission of nitric oxide. At present, it is still a challenge to enhance the regeneration performance of complex solution by changing the structure of the support to enhance the reduction capacity of the catalyst. Herein, N-doped porous carbons (NPCs) were used as an excellent support for synthesizing Pd/NPCs, and then they were utilized as a catalyst toward Fe(II)EDTA-NO reduction. The characterization results of X-ray diffraction, X-ray photoelectron spectra, and transmission electron microscopy confirmed that the dispersion of Pd nanoparticles (NPs) could be improved by N atoms in NPCs. Benefiting from the appropriate Pd NPs particle size and the intrinsic advantages of the support, the resultant Pd/NPCs exhibited superior performances such as a denitrification rate of 90.4% with an N 2 selectivity of 99.6% (used for 5 min under mild conditions) and a turnover frequency of 1916 h −1 . In addition, the kinetic calculation and reaction mechanism derivation provided a new avenue for the fabrication of highly effective catalysts over liquid phase denitrification.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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N-Doped Porous Carbon-Anchored Pd Nanoparticles: A Highly Efficient Catalyst for Fe(II)EDTA-NO Reduction

et al. 2021

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NO reduction mechanism in microreactor with cantor fractal structure

Yuan

Chen

2022

J of Chemical Tech & Biotech

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With the rising emission of NO and particulate matter in vehicle exhaust, the atmosphere is gradually deteriorating and human health is being impacted. In order to reduce the NO emission in automobile exhaust devices, a tubular microreactor with a Cantor structure was studied in this paper. The NO conversion rate and concentration were evaluated by considering the fractal principle, reactant concentration ratio, inlet velocity and channel temperature. Increasing the fractal dimension could promote the mixing of reactants and make the distribution of species concentration in the channel more uniform. When the NO flux at the inlet of the microreactor channel was a constant, increasing the concentration of NH 3 could significantly improve the reaction efficiency. Results show that the effect on the reaction results was best when the NO inlet velocity was lower and the NH 3 inlet velocity higher. For example, when u NO =0.025 m s −1 and u NH3 =0.05 m s −1 , the conversion rate of NO was as high as 98%. Porosity had little effect on the reaction results. Through comparison of the NO concentration at the outlet at different channel temperatures, it was concluded that increasing the temperature in the channel is most helpful in improving the reaction efficiency.

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Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

Liao

Zhao

Yang

et al. 2022

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environmental compatibility. [2] However, the coexistence of NO and SO 2 in the flue gas makes the deactivation of the traditional catalysts, due to the competition adsorption of SO 2 and NO on the active sites of the catalyst surface, resulting in the change of catalyst structure and the decrease of NO conversion efficiency.Recently, many researchers have been focused on tuning the structures of the catalysts to avoid the poison effect caused by SO 2 . The design of active components with the construction of a unique hollow structure presents the enhanced catalytic performance on NO oxidation with the existence of SO 2 . [3] The cavity confinement effect of the hollow nanoreactor could realize the impact on the unique electronic and geometric structure for enhancing the charge transfer and separation in the temporal-spatial catalytic process. [4] The charge transfer induced by the hetero-shelled hollow structure may change the catalytic activity and selectivity. [5] Besides, more interesting catalysts have been developed and applied to NO oxidation, such as composites structure control from one dimensional to three dimensional, [6,7] surface active site including defects engineering, [8,9] and catalytic sites tuning on synergetic conversion. [2,10] Non-thermal plasma(NTP) technology has attracted lots of research attention for NO catalytic removal. [11] The combination of NTP and catalyst can promote the formation of reaction intermediates on the catalyst surface, thus reducing the activation energy of the reaction, and achieving the rapid selective catalytic oxidation of NO at low temperatures. [12][13][14][15] In fact, many researchers attentions have been paid to tune the engineering parameters of the NTP and the advanced catalyst structure design without exploring the synergetic effect on the temporal-spatial structure, which may induce spatial charge rearrangement and trigger the micro-domain surficial species reaction. For instance, Cui et al. [16] studied the process of simultaneous oxidation of NO and SO 2 using non-thermal plasma coupled with catalyst on engineering parameters control. They found that the oxidation efficiency of both NO and SO 2 could be significantly improved in conjunction with further oxidation by the wet electrostatic precipitator (WESP). Furthermore, because of the unique properties of the hetero-shelled hollow structure catalyst, it may also be easier to produce synergistic Facilitating the mass transfer and spatial charge separation is a great challenge for achieving efficient oxidation of NO and outstanding sulfur resistance. Herein, a hydrothermal-assisted confinement growth technique is used to fabricate well-defined three-dimensional CuOx@MnOx hetero-shelled hollow-structure catalysts. By integrating the coupled plasma space reactor and the porous hierarchical structure of the catalyst, excellent stability (10 h) and high conversion of NO (93.86%) are reached under the concentration of SO 2 (1000 mg m -3 ) and NO (200 mg m -3 ). Impressively, precise surface characterization ...

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Core-shell Ag-Pd nanoparticles catalysts for efficient NO reduction by formic acid

Cited by 8 publications

References 35 publications

N-Doped Porous Carbon-Anchored Pd Nanoparticles: A Highly Efficient Catalyst for Fe(II)EDTA-NO Reduction

N-Doped Porous Carbon-Anchored Pd Nanoparticles: A Highly Efficient Catalyst for Fe(II)EDTA-NO Reduction

NO reduction mechanism in microreactor with cantor fractal structure

Hetero‐Shelled Hollow Structure Coupled with Non‐Thermal Plasma Inducing Spatial Charge Rearrangement for Superior NO Conversion and Sulfur Resistance

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