Coke-resistant Au–Ni/MgAl2O4 catalyst for direct methanation of syngas

Wang, Fen; Zhang, Jingcai; Li, Weizhen; Chen, Binghui

doi:10.1016/j.jechem.2019.03.028

Cited by 25 publications

(8 citation statements)

References 28 publications

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“…The deficiency of ZrO 2 to adsorb/desorb bidentate carbonates above 150 • C has been associated with a promotion of the H 2 combustion over the CO oxidation [40]. Likewise, H 2 loss increases in the majority of the supported Au-Cu catalysts (Figure 3c,d) compared to their respective bare support (Figure 3a,b), possibly due to affinity of the Au-Cu system to form intermediates in the H 2 oxidation (e.g., hydroxyl groups [29,41]) and methane formation (e.g., C-O* species [18,20,42]). Also, the most active catalysts in the CO removal (i.e., AuCu/CeO 2 , AuCu/ZrO 2 , AuCu/CeO 2 -SiO 2 , and AuCu/CeO 2 -ZrO 2 ) promote higher H 2 consumption.…”

Section: Figurementioning

confidence: 92%

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

2019

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A catalytic screening was performed to determine the effect of the support on the performance of an Au–Cu based system for the removal of CO from an actual syngas. First, a syngas was obtained from reforming of ethanol. Then, the reformer outlet was connected to a second reactor, where Au–Cu catalysts supported on several single and dual metal oxides (i.e., CeO2, SiO2, ZrO2, Al2O3, La2O3, Fe2O3, CeO2-SiO2, CeO2-ZrO2, and CeO2-Al2O3) were evaluated. AuCu/CeO2 was the most active catalyst due to an elevated oxygen mobility over the surface, promoting CO2 formation from adsorption of C–O* and OH− intermediates on Au0 and CuO species. However, its lower capacity to release the surface oxygen contributes to the generation of stable carbon deposits, which lead to its rapid deactivation. On the other hand, AuCu/CeO2-SiO2 was more stable due to its high surface area and lower formation of formate and carbonate intermediates, mitigating carbon deposits. Therefore, use of dual supports could be a promising strategy to overcome the low stability of AuCu/CeO2. The results of this research are a contribution to integrated production and purification of H2 in a compact system.

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Section: Figurementioning

confidence: 92%

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

2019

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“…60 In the case of the spent xNi-yFe/HZSM-5 catalysts, the peaks at approximately 1400 and 1625 cm −1 were attributed to the disordered and graphitized carbon species, respectively. 61 On the basis of the above results, it could be concluded that supports had an effect on coke deposition for the corresponding catalysts. This study has shown a good understanding of Ni−Fe catalysts in the deoxygenation process and provided useful information for designing catalysts with high activity and selectivity by using the interaction between metals and supports.…”

Section: Catalytic Testmentioning

confidence: 80%

Ni–Fe Catalysts Supported on γ-Al₂O₃/HZSM-5 for Transformation of Palmitic Acid into Hydrocarbon Fuel

Hui

Yang

Lei

et al. 2020

Ind. Eng. Chem. Res.

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Ni–Fe catalysts supported on γ-Al2O3 and HZSM-5 were proved to be active for fatty acids conversion into hydrocarbon fuel. The strong interaction between Ni and γ-Al2O3 produced NiAl2O4 species without the Ni–Fe alloy on 10%Ni-5%Fe/γ-Al2O3, while the weak interaction between Ni and HZSM-5 induced FeNi3 alloy formation along with Ni and NiFe2O4 on 10%Ni-5%Fe/HZSM-5. On the two catalysts, palmitic acid could be completely converted. However, the hydrocarbon selectivity was obviously different, with pentadecane and hexadecane mainly obtained with a selectivity of 72.2% on 10%Ni-5%Fe/γ-Al2O3 and 60.5% on 10%Ni-5%Fe/HZSM-5, respectively, which were attributed to the formation of different active species. Detailed studies suggested that the surface of NiAl2O4 species favored the decarboxylation (DCO2)/decarbonylation (DCO) pathway to produce pentadecane, whereas the FeNi3 alloy facilitated the hydrodeoxygenation (HDO) pathway to produce hexadecane. This work offers an effective approach to tuning the hydrocarbon selectivity by using different interactions between metals and supports.

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“…As can be seen from Figure 2A, the elements O, Al, P, and Ni were detected, the results of which were consistent with the XRD results. The spectra of Ni (Figure 2B) exhibited three bands at 851.7, 855.5, and 860.7 eV, attributed to the Ni 2 p 3/2 spectra for Ni 0 and Ni 2+ species, and the Ni satellite peak, respectively 29,30 . The observed Ni 0 peak suggested that the catalyst was reduced and can exhibit activity because Ni 0 is the active species in the catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…The spectra of Ni (Figure 2B) exhibited three bands at 851.7, 855.5, and 860.7 eV, attributed to the Ni 2p3/2 spectra for Ni 0 and Ni 2+ species, and the Ni satellite peak, respectively. 29,30 The observed Ni 0 peak suggested that the catalyst was reduced and can exhibit activity because Ni 0 is the active species in the catalyst. The Ni 2+ peak was attributed to the inevitable oxidation of nickel.…”

Section: Characterization Of the Catalystmentioning

confidence: 99%

Selective hydrogenation of α‐pinene on a nickel supported aluminophosphate catalyst: Process optimization and reaction kinetics

Yang

Xiang

Jiang

et al. 2020

Int J of Chemical Kinetics

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cis‐Pinane, the hydrogenation product of pinene, is a key chemical intermediate and its production is an important forest chemical process. In this study, α‐pinene was hydrogenated using a nickel‐supported aluminophosphate catalyst (Ni/APO‐PT) in the batch mode of operation. The pore structure of the catalyst was characterized, the process parameters were studied, the hydrogenation process was optimized, and the kinetic study was conducted. The results showed that the conversion of pinene was positively correlated with temperature, duration, and catalyst dosage. In contrast, the selectivity of cis‐pinane was negatively correlated with temperature and catalyst dosage. An optimization was performed using the response surface methodology (RSM). A selectivity of 96.2% was obtained with α‐pinene conversion of 98.5% under optimal conditions, that is, a temperature of 405 K, reaction time of 60 min, hydrogen pressure of 3 MPa, and catalyst loading of 3.32 wt%. The reusability of the catalyst was studied, and the catalyst was found to maintain efficient activity for seven cycles. The kinetics of hydrogenation were investigated using both linear and nonlinear methods in the absence of diffusional limitation. In the temperature range from 403 to 433 K, the hydrogenation of α‐pinene to pinane was compatible with the pseudo‐first‐order process, and the activation energies for the formation of cis‐pinane and trans‐pinane were 41.8 and 56.1 kJ/mol, respectively. This study shows that the performance of the Ni/APO‐PT catalyst is similar to that of noble metals and the catalyst has the potential for industrial applications.

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Coke-resistant Au–Ni/MgAl2O4 catalyst for direct methanation of syngas

Cited by 25 publications

References 28 publications

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Ni–Fe Catalysts Supported on γ-Al₂O₃/HZSM-5 for Transformation of Palmitic Acid into Hydrocarbon Fuel

Selective hydrogenation of α‐pinene on a nickel supported aluminophosphate catalyst: Process optimization and reaction kinetics

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Coke-resistant Au–Ni/MgAl2O4 catalyst for direct methanation of syngas

Cited by 25 publications

References 28 publications

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Ni–Fe Catalysts Supported on γ-Al2O3/HZSM-5 for Transformation of Palmitic Acid into Hydrocarbon Fuel

Selective hydrogenation of α‐pinene on a nickel supported aluminophosphate catalyst: Process optimization and reaction kinetics

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Ni–Fe Catalysts Supported on γ-Al₂O₃/HZSM-5 for Transformation of Palmitic Acid into Hydrocarbon Fuel