Effects of modifier (Gd, Sc, La) addition on the stability of low Ni content catalyst for dry reforming of model biogas

Fuel ◽  
2022 ◽  
Vol 312 ◽  
pp. 122823
Author(s):  
Quan Luu Manh Ha ◽  
Hanan Atia ◽  
Carsten Kreyenschulte ◽  
Henrik Lund ◽  
Stephan Bartling ◽  
...  
2021 ◽  
Vol 360 ◽  
pp. 46-54 ◽  
Author(s):  
Daniel G. Araiza ◽  
Diana G. Arcos ◽  
Antonio Gómez-Cortés ◽  
Gabriela Díaz

2018 ◽  
Vol 5 (14) ◽  
pp. 27607-27616 ◽  
Author(s):  
N.D. Charisiou ◽  
A. Iordanidis ◽  
K. Polychronopoulou ◽  
I.V. Yentekakis ◽  
M.A. Goula

Fuel ◽  
2019 ◽  
Vol 254 ◽  
pp. 115562 ◽  
Author(s):  
Xiaodong Li ◽  
Yanli Huang ◽  
Qian Zhang ◽  
Zhijun Zuo ◽  
Xiaodong Wang ◽  
...  

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 242
Author(s):  
Ahmed A. Ibrahim ◽  
Ahmed S. Al-Fatesh ◽  
Nadavala Siva Kumar ◽  
Ahmed E. Abasaeed ◽  
Samsudeen O. Kasim ◽  
...  

Dry reforming of methane (DRM) was studied in the light of Ni supported on 8%PO4 + ZrO2 catalysts. Cerium was used to modify the Ni active metal. Different percentage loadings of Ce (1%, 1.5%, 2%, 2.5%, 3%, and 5%) were tested. The wet incipient impregnation method was used for the preparation of all catalysts. The catalysts were activated at 700 °C for ½ h. The reactions were performed at 800 °C using a gas hourly space velocity of 28,000 mL (h·gcat)−1. X-ray diffraction (XRD), N2 physisorption, hydrogen temperature programmed reduction (H2-TPR), temperature programmed oxidation (TPO), temperature programmed desorption (TPD), and thermogravimetric analysis (TGA) were used for characterizing the catalysts. The TGA analysis depicted minor amounts of carbon deposition. The CO2-TPD results showed that Ce enhanced the basicity of the catalysts. The 3% Ce loading possessed the highest surface area, the largest pore volume, and the greatest pore diameter. All the promoted catalysts enhanced the conversions of CH4 and CO2. Among the promoted catalysts tested, the 10Ni + 3%Ce/8%PO4 + ZrO2 catalyst system operated at 1 bar and at 800 °C gave the highest conversions of CH4 (95%) and CO2 (96%). The stability profile of Cerium-modified catalysts (10%Ni/8%PO4 + ZrO2) depicted steady CH4 and CO2 conversions during the 7.5 h time on stream.


Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 21
Author(s):  
UPM Ashik ◽  
Shusaku Asano ◽  
Shinji Kudo ◽  
Doan Pham Minh ◽  
Srinivas Appari ◽  
...  

This study aimed to investigate the effect of carbon derived from glucose (C) on the physicochemical characteristics and catalytic activity of Ni, supported over SiO2, ZSM-5, and TiO2 in methane dry reforming. Among the Ni catalysts without C, Ni/SiO2 exhibited the highest CH4-CO2 conversion and stability at all experimented temperatures. On the other hand, the C-incorporated catalysts prepared by glucose impregnation, followed by pyrolysis, showed dissimilar performances. C improved the stability of Ni/SiO2 in the reforming at 650 °C and 750 °C and increased the CH4 and CO2 conversion to the level close to the thermodynamic equilibrium at 850 °C. However, this element did not substantially affect the activity of Ni/ZSM-5 and exerted a retarding effect on Ni/TiO2. Characterizations with H2-TPD, XRD, EXAFS, and STEM-EDS revealed that the different influences of C by the supports were attributed to the extent of metal dispersion and metal-support interaction.


2018 ◽  
Vol 4 (4) ◽  
pp. 60 ◽  
Author(s):  
Federica Menegazzo ◽  
Cristina Pizzolitto ◽  
Elena Ghedini ◽  
Alessandro Di Michele ◽  
Giuseppe Cruciani ◽  
...  

Methane dry reforming (MDR) allows the transformation of carbon dioxide and methane, the two main greenhouse gases, into syngas. Given the high endothermicity of the process, it is necessary to produce a catalytic system that is very active, selective and resistant to coking deactivation; this work focuses on the development of a heterogeneous catalyst based on nickel supported on cerium oxide. Several strategies of synthesis of the catalysts were studied with particular attention to the lanthanum addition methodology. Both supports and catalysts, fresh and used, were deeply characterized by different techniques (N2 physisorption, TPR, XRD, SEM). The effect of temperature on activity and selectivity of the different catalysts was also studied. A positive effect of lanthanum addition is strongly related to the synthetic methodology. Incipient wetness impregnation of lanthanum precursor on an already calcined ceria has led to the best catalytic activity. This behaviour is due to a more effective interaction between nickel and the support, which results in a higher dispersion of the active phase. The structural modifications have led to an improvement of the redox pump of the ceria, reducing the formation of coke during the reaction and improving the stability on time on stream.


2012 ◽  
Vol 134 (2-3) ◽  
pp. 945-950 ◽  
Author(s):  
H. Nady ◽  
N.H. Helal ◽  
M.M. El-Rabiee ◽  
W.A. Badawy

RSC Advances ◽  
2021 ◽  
Vol 11 (30) ◽  
pp. 18187-18197
Author(s):  
Moritz Wolf

Thermodynamic assessment of oxidation and sintering of Co or Ni as well as the size dependent oxidation of nanoparticles to the corresponding oxide are presented considering the prevailing conditions during steam and dry reforming of methane.


Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 741
Author(s):  
Alfonso J. Carrillo ◽  
José Manuel Serra

Exsolution is emerging as a promising route for the creation of nanoparticles that remain anchored to the oxide support, imparting remarkable stability in high temperature chemical processes such as dry reforming of methane. This process takes place at temperatures around 850 °C, which causes sintering-related issues in catalysts prepared using conventional impregnation methods, which could be overcome by using exsolution functionalized oxides. In this work, FeNi3 alloy nanoparticles exsolved from Sr2FexNi1-xMoO6-δ double-layered perovskites were evaluated as a dry reforming catalyst, paying special attention to structure–activity relationships. Our results indicate that increasing the Ni content favors the nanoparticle dispersion, eventually leading to increased CO2 and CH4 conversions. The exsolved nanoparticles presented remarkable nanoparticle size (ca. 30 nm) stability after the 10 h treatment, although the formation of some phase segregations over the course of the reaction caused a minor decrease in the nanoparticle population. Overall, the results presented here serve as materials processing guidelines that could find further potential use in the design of more efficient (electro)catalysts in other fuel production or energy conversion technologies.


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