The influence of reduction temperature on the performance of ZrOx/Ni-MnOx/SiO2 catalyst for low-temperature CO2 reforming of methane

Lu, Yong; Wang, Ye; Shi, Jia; Xu, Hualong; Shen, Wei; Hu, Changwei

doi:10.1016/j.cattod.2016.05.031

Cited by 52 publications

(29 citation statements)

References 35 publications

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“…Figure 7A shows the Ni 2p3/2 XPS spectrum of three catalysts after reduction at 750 °C (before reaction). The figure shows two peaks having binding energies of 852.4 and 856.3 eV for all catalysts, which are assigned, respectively, to metallic Ni and NiO, these results are in agreement with previously reported data in the literature [32,33]. The presence of NiO on the surface of the reduce catalysts (prior reaction) might have been owing to the re-oxidation of Ni 0 when the reduced samples were exposed to air.…”

Section: Xps After Reductionsupporting

confidence: 91%

Enhanced Long-term Stability and Carbon Resistance of Ni/MnxOy-Al2O3 Catalyst in Near-equilibrium CO2 Reforming of Methane for Syngas Production

Djebarri

Touahra

Aider

et al. 2020

Bull. Chem. React. Eng. Catal.

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Herein we study the catalytic activity/stability of a new generation of cheap and readily available Ni and Al-based catalysts using two Mn precursors, namely Mn(NO3)2 and Mn(EDTA)2- complex in the reaction of CO2 reforming of methane. In this respect, Ni/Al2O3 and two types of Ni/MnxOy-Al2O3 catalysts were successfully synthesized and characterized using various analytical techniques: TGA, ICP, XRD, BET, FTIR, TPR-H2, SEM-EDX, TEM, XPS and TPO-O2. Utilization of Mn(EDTA)2- as synthetic precursor successfully furnished Ni/Al2O3-MnxOyY (Y = EDTA) catalyst which was more active during CO2 reforming of methane when compared to Ni/MnxOy-Al2O3 catalyst, synthesized using Mn(NO3)2 precursor. Compared to Ni/MnxOy-Al2O3, Ni/Al2O3-MnxOyY catalyst afforded near-equilibrium conversion values at 700 °C (ca. 95% conversion for CH4 and CO2, and H2/CO = 0.99 over 50 h reaction time). Also, Ni/Al2O3-MnxOyY showed more resistance to carbon formation and sintering; interestingly, after 50 h reaction time, the size of Ni0 particles in Ni/MnxOy-Al2O3 almost doubled while that of Ni/Al2O3-MnxOyY remained unchanged. The elevated conversion of CO2 and CH4 in conjunction with the observed low carbon deposition on the surface of our best catalyst (Ni/Al2O3-MnxOyY) indicated the presence of MnxOy oxide positioning mediated simultaneous in-situ carbon elimination with subsequent generation of oxygen vacant sites on the surface for more CO2 adsorption. Copyright © 2020 BCREC Group. All rights reserved

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Section: Xps After Reductionsupporting

confidence: 91%

Enhanced Long-term Stability and Carbon Resistance of Ni/MnxOy-Al2O3 Catalyst in Near-equilibrium CO2 Reforming of Methane for Syngas Production

Djebarri

Touahra

Aider

et al. 2020

Bull. Chem. React. Eng. Catal.

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“…−OH peaks at

\overset{ν}{true}

=3500–3800 cm −1 are also observed, which come from the unreduced NiPS structure . Furthermore, several peaks can be seen at

\overset{ν}{true}

=1400–1650 cm −1 , which are attributed commonly to carbonate species . Probably, adsorbed CO 2 reacts with surface −OH groups to form carbonate …”

Section: Resultsmentioning

confidence: 94%

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

2017

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We synthesize a new sandwich‐like silica@Ni@silica multicore–shell catalyst. Firstly, Ni phyllosilicate (NiPS) is supported on silica nanospheres by a simple ammonia evaporation method. Then NiPS is coated with a layer of mesoporous silica to obtain a core–shell NiPS@silica structure by the hydrolysis of tetraethylorthosilicate (TEOS). The thickness of the shell can be tuned by varying the amount of TEOS. After calcination and H2 reduction at high temperature, multiple small Ni nanoparticles (≈6 nm) are generated and supported on the inner silica core but also encapsulated within the outer mesoporous silica shell. This silica@Ni@silica multicore–shell catalyst shows a high and stable conversion (≈60 %, gas hourly space velocity=60 000 mL h−1 gcat−1) for the dry reforming of methane (DRM) at 600 °C, whereas pristine NiPS deactivates quickly because of heavy carbon formation. We investigated the spent catalysts by using thermogravimetric analysis and TEM and found that there is almost no carbon formation for this new multicore–shell catalyst. Compared with a conventional Ni@silica core–shell catalyst, our multicore–shell catalyst is much easier to synthesize and the process does not require any toxic organic solvents. We believe that this strategy to make a multicore–shell catalyst can be applied to more nanomaterials and extended to other catalytic reactions besides DRM.

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“…The tetragonal ZrO 2 reflections with the crystallite sizes of 9 nm based on the Scherrer equation could be identified for all calcined, reduced, and used catalysts. The peak at about 43.3 ° and 44.5 °can be assigned to the NiO and Ni 0 species [58,59]. The NiO reflections present on calcined catalysts, disappear on all the reduced catalysts, indicating that the nickel species have been reduced on all the reduced catalysts.…”

Section: Basicity Physical-chemical Features and Surface Characterizationmentioning

confidence: 95%

The effect of adsorbed oxygen species on carbon-resistance of Ni-Zr catalyst modified by Al and Mn for dry reforming of methane

Wang

Cui

et al. 2022

Catalysis Today

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Dry reforming of methane was investigated over Ni-Zr catalysts modified by Aluminum and Manganese. The catalysts were characterized by XRD, CO 2 -TPD, XPS, TGA, and Raman. Among all prepared catalysts, the 5Al-5Mn (5 wt% Al and 5 wt% Mn) catalyst showed the highest CH 4 and CO 2 conversion at 700 o C DRM with low carbon deposition. The CO 2 -TPD results exhibited that the 5Al-5Mn catalyst had the highest amounts of both total basic sites and medium-strength basic sites, which could promote the adsorption and activation of CO 2 molecule during the DRM reaction , and further reduce the carbon deposition. The XRD results suggested that the addition of both Al and Mn led to smaller nickel particle size. Besides, the lower carbon deposition on 5Al-5Mn and 2.5Al-7.5Mn catalyst was derived from a higher content of surface adsorption oxygen species, which was verified by the O 1s results. While the lower number of basic sites, more strong basic sites and larger particle size on 5Mn and 5Al catalysts result in a higher amount of carbon deposition.

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The influence of reduction temperature on the performance of ZrOx/Ni-MnOx/SiO2 catalyst for low-temperature CO2 reforming of methane

Cited by 52 publications

References 35 publications

Enhanced Long-term Stability and Carbon Resistance of Ni/MnxOy-Al2O3 Catalyst in Near-equilibrium CO2 Reforming of Methane for Syngas Production

Enhanced Long-term Stability and Carbon Resistance of Ni/MnxOy-Al2O3 Catalyst in Near-equilibrium CO2 Reforming of Methane for Syngas Production

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

The effect of adsorbed oxygen species on carbon-resistance of Ni-Zr catalyst modified by Al and Mn for dry reforming of methane

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