Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation

Lin, Min; Yu, Xiaolin; Yang, Xueqin; Ma, Xiuyun; Ge, Maofa

doi:10.1016/s1872-2067(19)63273-0

Cited by 24 publications

(4 citation statements)

References 49 publications

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“…In order to gain further insights into the coupling effects of ZnCr 2 O 4 and Sbx-H-ZSM-5, the surface intermediates were monitored by in situ DRIFTS. As shown in Figure b, the adsorbed surface species of carbonate/bicarbonate (1220 and 1608 cm –1 ), − formate (1330, 1370, 1500, 2864, and 2966 cm –1 ), ,, methoxy (2815 and 2930 cm –1 , with 50.519 ppm and 3.176 ppm, respectively), , and formaldehyde (1772 cm –1 ) ,, are distinctly observed for ZnCr 2 O 4 oxide under the reaction conditions. The intensities of infrared bands for these oxygenated species were improved as the CO 2 adsorption time increased from 5 to 40 min.…”

Section: Results and Discussionmentioning

confidence: 99%

Highly Selective Conversion of CO₂ or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

et al. 2022

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The extensive emission of CO2 into the atmosphere due to the burning of fossil fuels has urged many countries to move toward decarbonized energy. Based on the concept of carbon neutrality, the European Union Emissions Trading System implemented the aviation carbon tax (ACT), which stimulated the rapid transformation in aviation fuels. To cope with the ACT and mitigate the CO2 emissions from the aviation industry, here, we present a promising route for the synthesis of precursors such as aromatics, alkyl benzenes, and naphthenes, which account for 40–50 vol % fraction of the kerosene-based aviation fuel, from waste CO2 or biomass-derived syngas. The ultra-high selectivity of single-ring aromatics (precursors for the kerosene-based aviation fuel) with a selective range of carbon chain numbers (C8–C12) was achieved (>80% in hydrocarbons at a reaction temperature of 275 °C) via the catalytic hydrogenation of CO2 or CO over a bifunctional catalyst (nano-sized ZnCr2O4/Sbx-H-ZSM-5). In situ diffuse reflectance infrared Fourier transform spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, gas chromatography–mass spectrometry, and reaction analysis revealed that the product distribution was controlled by thermodynamics and the formation of the aromatics followed an “aldol–aromatic” mechanism. The high selectivity of aromatics at the low reaction temperature (i.e., 275 °C) was attributed to the catalyst topology, the closed carbon chain aromatization reaction, and the presence of highly active oxygenated species in the hydrocarbon pool. For the first time, an asymmetric desorption behavior between the active oxygenate species and aromatic hydrocarbons over the ZnCr2O4/Sbx-H-ZSM-5 catalyst is reported with the help of integrated differential phase contrast scanning transmission electron microscopy, which made the reaction highly selective toward aromatics. This strategy gives a carbon-neutral route for the synthesis of kerosene-based aviation fuel precursors and will reduce the burden of the carbon tax on the aviation industry.

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Section: Results and Discussionmentioning

confidence: 99%

Highly Selective Conversion of CO₂ or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

et al. 2022

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“…However, the degree of disorder only has a little decrease to the translation from HSG ( r = 1.05) to Co(OH) 2 /PRGO ( r = 1.03). The abnormal changes in the degree of disorder would be caused by the following factors: partially rGO has decreased the number of in-plane and edge defects resulted from the reduced effect of 2-methylimidazole and cobalt ions toward the translation from GO to rGO; the formation of Co(OH) 2 on the GO surface results in the increase disorder degree with exactly anchored on GO nanosheets. , Additionally, the peaks have been also observed in Co(OH) 2 /PRGO at 189, 469, 514, 606, and 675 cm –1 are attributable to Raman-active modes of Co 3 O 4 …”

Section: Resultsmentioning

confidence: 99%

Heterophase-Structured Cobalt Hydroxide on Partly Reduced Graphene Oxide for Enhanced Dopamine Biosensing

Zhang

et al. 2023

ACS Appl. Eng. Mater.

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A hetero-phase structure of cobalt hydroxide [α/β-Co(OH)2] in situ formed with the partly reduced graphene oxide [Co(OH)2/PRGO] has been fabricated by a coprecipitation method. Depending on the interactions (nucleation, bonding with oxygen-rich groups, and partial conversion of GO into rGO) provided by GO, cobalt ions utilized the interactions under alkaline conditions provided by 2-methylimidazole to form hetero-phase α/β-Co(OH)2 and maintain the unstable-structure [α-Co(OH)2]. Beneficial to the large electrochemical active surface, rich redox active sites, and electronic transfer capability derived from hetero-phase structure [α/β-Co(OH)2] and the partly reduced graphene oxide, the Co(OH)2/PRGO has an extraordinary detection performance of DA: a multi-section continuous detection range (0.1 nM to 450 μM), a ultra-low limit of detection (0.078 nM, S/N = 3), and a strong anti-interference ability, coupled with an application potential in biological foods (pork) and in the body environment (serum).

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“…In accordance with Figure 4, the Raman bands located at ∼188, 469, 510, and 677 cm −1 are associated with the F 2g 1 , E g , F 2g 2 , and A 1g modes of the Co 3 O 4 spinel structure, respectively. 26,45 Among them, the bands at ∼188 and 677 cm −1 are assigned to the inherent vibrational modes of Co 2+ -O 2and Co 3+ -O 2− . 46 Moreover, the peak of A 1g of Co 3 O 4 -HP obviously shifts to lower frequencies to 666 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Defect Engineering and Synergistic Effect in Co₃O₄ Catalysts for Efficient Removal of Formaldehyde at Room Temperature

Chen

Huang

Chen

et al. 2020

Ind. Eng. Chem. Res.

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The inherent low activity at room temperature has greatly limited the utilization of Co 3 O 4 in indoor air purification. In this work, an extremely facile and mild method utilizing the strong oxidation of H 2 O 2 was designed to prepare a novel Co 3 O 4 -HP catalyst. The Co 3 O 4 -HP catalyst exhibits excellent removal activity for low-level concentration (∼1 ppm) of formaldehyde (HCHO) at room temperature. Under the static test mode, it shows 90.62% HCHO removal efficiency in 180 min at an RH of ∼55%. Under the dynamic test mode, it maintains the performance to remove approximately 97.26% of HCHO within 180 min under a GHSV of ∼90,000 mL•h −1 •g −1 . Additionally, the HCHO removal efficiency of Co 3 O 4 -HP is also maintained at around 94.76% under a higher GHSV of ∼150,000 mL•h −1 •g −1 . Such a satisfying activity is due to abundant oxygen vacancy defects bringing about a large number of surface reactive oxygen species and high redox capacity and oxygen migration capacity. It is also because of the synergistic effect of surface OH groups. This strategy will open an exciting avenue to design outstanding catalysts for HCHO removal by defect engineering and the synergistic effect.

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Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation

Cited by 24 publications

References 49 publications

Highly Selective Conversion of CO₂ or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

Highly Selective Conversion of CO₂ or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

Heterophase-Structured Cobalt Hydroxide on Partly Reduced Graphene Oxide for Enhanced Dopamine Biosensing

Defect Engineering and Synergistic Effect in Co₃O₄ Catalysts for Efficient Removal of Formaldehyde at Room Temperature

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Exploration of the active phase of the hydrotalcite-derived cobalt catalyst for HCHO oxidation

Cited by 24 publications

References 49 publications

Highly Selective Conversion of CO2 or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

Highly Selective Conversion of CO2 or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

Heterophase-Structured Cobalt Hydroxide on Partly Reduced Graphene Oxide for Enhanced Dopamine Biosensing

Defect Engineering and Synergistic Effect in Co3O4 Catalysts for Efficient Removal of Formaldehyde at Room Temperature

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Product

Resources

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Highly Selective Conversion of CO₂ or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

Highly Selective Conversion of CO₂ or CO into Precursors for Kerosene-Based Aviation Fuel via an Aldol–Aromatic Mechanism

Defect Engineering and Synergistic Effect in Co₃O₄ Catalysts for Efficient Removal of Formaldehyde at Room Temperature