The effect of CuO on a Pt−Based catalyst for oxidation in a low-temperature fuel cell

Maturost, Suphitsara; Themsirimongkon, Suwaphid; Waenkaew, Paralee; Promsawan, Napapha; Jakmunee, Jaroon; Saipanya, Surin

doi:10.1016/j.ijhydene.2020.08.154

Cited by 19 publications

(4 citation statements)

References 45 publications

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“…Besides, as shown in Table 1, with the increase of copper content, the lattice parameter of the catalysts decreased slightly, which further proved that because the size of coordinated Cu + and Cu 2 + ions is smaller than Ce 3 + or Ce 4 + , the copper species was incorporated into the Ce 0.5 Zr 0.5 O 2 lattice. [14] When the amount of copper doping was above 0.4, due to the bulk structure of CuO, weak diffraction peaks at 35.4°and 38.9°was detected, [15] which was detrimental to the catalytic activity.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Cu‐Promoted Pt/Ce_0.5Zr_0.5O_x Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

et al. 2022

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In response to stricter emission regulations, lean-burn engines have attracted more and more attention. However, lean burn engines would inevitably lead to the increase in NO x emissions. The researchers combined Three-Way Catalyst (TWC) and Selective Catalytic Reduction (SCR) to propose "passive SCR", which makes the engine periodically switch between rich and lean burn. During rich combustion, ammonia is produced by the TWC catalyst, stored in the downstream SCR, and reacts with NO x during lean combustion, in which increasing the ammonia yield on the TWC catalyst is the key. In this study, the self-propagating high-temperature synthesis method was used to modify the catalyst by adding copper to improve the ammonia production efficiency. The conversion rate of catalysts with different copper doping ratios from NO to ammonia was measured. Through XRD, BET, H 2 -TPR, TEM, HRTEM, XPS, in-situ DRIFTS, etc., the improvement mechanism of copper doping was analysed. The results showed that Pt 0.01 Cu 0.1 Ce 0.45 Zr 0.45 O x had the highest catalytic activity, the widest reaction temperature window (300-550 °C) with the conversion greater than 96 %. The characterization results showed that appropriate amount of copper doping can adjust the valence distribution, form more oxygen vacancies, and improve the distribution of active species. The in-situ DRIFTS further demonstrated that the conversion from bridged to monodentate and bidentate nitrate may be the key factors on the catalyst surface.

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Section: Catalyst Characterizationmentioning

confidence: 99%

Cu‐Promoted Pt/Ce_0.5Zr_0.5O_x Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

et al. 2022

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“…Functionalization with ionic liquid polymers is also attractive because they improve the solution dispersibility of the supports and facilitate faster nucleation of the catalysts resulting in small and uniform metal nanoparticles because of their structural properties and intrinsic chemistry (Wu et al, 2015). Modifications of CNTs with CeO 2 (Maturost et al, 2021) and TiO 2 (Figure 7d; W. Shi et al, 2021) can help mitigate CO poisoning of Pt and Pd catalysts via electronic and bifunctional mechanisms. The solvents used during synthesis were found to impact the uniformity of the TiO 2 coating on CNT (Figure 7e–g; W. Shi et al, 2021).…”

Section: Anode Electrocatalystsmentioning

confidence: 99%

Recent advances in electrocatalysts, mechanism, and cell architecture for direct formic acid fuel cells

Bhaskaran

Abraham²,

Chetty³

2021

WIREs Energy & Environment

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Direct formic acid fuel cells (DFAFCs) are potential candidates as power sources for various applications, especially in portable electronics and medical diagnostic devices. Though they have been the subject of considerable research, commercial prototypes of DFAFCs are rudimentary compared to other liquid fuel cells, particularly the widespread methanol‐based direct methanol fuel cells. Various strategies for rationally engineering the electrocatalysts for enhancing DFAFC performance have been explored in the last few years, such as alloying noble metals with earth‐abundant transition metals, designing specific morphological and structural arrangements, decorating the surface with corrosion‐tolerant cocatalysts, and providing better catalyst support for effective catalyst dispersion. An overall approach may be necessary and should include (i) understanding the underlying mechanism, which will guide the direction of catalyst engineering, (ii) employing morphological, compositional, and structural control of the electrocatalysts to improve catalyst utilization and enhance the intrinsic activity for real‐world applications, and (iii) integrating these in a proficiently designed cell architecture suitable for targeted applications. In this review, we focus on the recent advances in electrocatalysts, formic acid electrooxidation mechanisms, and DFAFC cell architectures, which could help address the opportunities and challenges of commercializing DFAFC as a prospective alternative power source for portable applications. This article is categorized under: Fuel Cells and Hydrogen > Science and Materials Energy Research & Innovation > Science and Materials

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“…Copper-based catalysts including CuO NPs are famous species for oxidation of different hydrocarbons, for example, alcohols, 43,44 carbon monoxide, 45 toluene, 46,47 and formic acid. 48 In this study, tall oil as an inexpensive and a renewable feedstock of the Kraft pulping industry was used in order to synthesize the oil-soluble copper tallate (Cu-Tall oil). In the catalyst, the tall oil served as the copper's organic ligand and helped it spread more efficiently in environments of heavy oil.…”

Section: Introductionmentioning

confidence: 99%

“…For improving the efficiency of the oxidation process of the crude oil, various soluble catalysts in oil have been studied such as metal stearates including copper, iron, and nickel, copper naphthenate, and oil-dispersed transition metal-based catalysts based on oxides coated with oleic acid, such as Fe 2 O 3 and CoFe 2 O 4 . ,, Among these catalysts, copper stearate exhibited excellent performance due to its solubility in heavy oil environments and copper acting as a precursor for the in situ synthesis of CuO nanoparticles, which are responsible for heavy oil oxidation in high-temperature regions during ISC. Copper-based catalysts including CuO NPs are famous species for oxidation of different hydrocarbons, for example, alcohols, , carbon monoxide, toluene, , and formic acid …”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Heavy Oil Oxidation Using Oil-Soluble Copper-Based Catalysts in In Situ Combustion for the In Situ Upgrading Process

et al. 2023

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Copper tallate (Cu-Tall oil) was fabricated as a soluble catalyst in crude oil for the oxidation process of oil in in situ combustion. Catalytic efficiency of the synthesized catalyst was examined in the liquid phase by coupling thermogravimetry (TG) and Fourier transform infrared spectroscopy and in porous medium using a porous medium thermo-effect cell. Moreover, the catalyst effect on the oxidation reaction of heavy oil for in situ upgrading was studied using visual combustion tubes. The calculation of kinetics was done by different iso-conversional methods, excluding Ozawa–Flynn–Wall (OFW), Freidman, and Kissinger–Akahira–Sunose (KAS) models by TG analysis data. Results showed that activation energy for heavy crude oil oxidation on average decreased to 161, 166, and 152 kJ/mol from 191, 195, and 185 kJ/mol using OFW, KAS, and Friedman, respectively. Using Cu-Tall oil catalysts, the viscosity of the obtained oil reduced to 85 mPa·s from 2072 mPa·s during the oxidation process. A saturate, aromatic, resin, and asphaltene (SARA) analysis also revealed that the heavy oil oxidation process with a catalyst resulted in a reduction of high-molecular-weight compounds such as resins and asphaltenes to 7.18 and 1.56% from 20.98 and 5.91%, respectively, while light fractions including saturates increased from 28.79 to 43.05%. In high-temperature oxidation reactions, oil-soluble Cu-Tall oil decomposed to copper oxide nanoparticles (CuO NPs) as the active catalyst, which showed a significant temperature decrease during high-temperature oxidation. This kind of precursor has high catalytic activity and low cost that make it an acceptable catalyst to develop the oxidation of heavy oil during high rate production from heavy crude oil reservoirs.

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The effect of CuO on a Pt−Based catalyst for oxidation in a low-temperature fuel cell

Cited by 19 publications

References 45 publications

Cu‐Promoted Pt/Ce_0.5Zr_0.5O_x Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

Cu‐Promoted Pt/Ce_0.5Zr_0.5O_x Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

Recent advances in electrocatalysts, mechanism, and cell architecture for direct formic acid fuel cells

Improving the Performance of Heavy Oil Oxidation Using Oil-Soluble Copper-Based Catalysts in In Situ Combustion for the In Situ Upgrading Process

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The effect of CuO on a Pt−Based catalyst for oxidation in a low-temperature fuel cell

Cited by 19 publications

References 45 publications

Cu‐Promoted Pt/Ce0.5Zr0.5Ox Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

Cu‐Promoted Pt/Ce0.5Zr0.5Ox Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

Recent advances in electrocatalysts, mechanism, and cell architecture for direct formic acid fuel cells

Improving the Performance of Heavy Oil Oxidation Using Oil-Soluble Copper-Based Catalysts in In Situ Combustion for the In Situ Upgrading Process

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Product

Resources

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Cu‐Promoted Pt/Ce_0.5Zr_0.5O_x Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

Cu‐Promoted Pt/Ce_0.5Zr_0.5O_x Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen