Hydrogen production via methane dry reforming process over CoAl and CoMgAl-Hydrotalcite derived catalysts

Abstract Co0.67Al0.31 and Co0.14Mg0.54Al0.31 hydrotalcite based catalysts were prepared by a co-precipitation method at a fixed pH=11, exhibiting a suitable hydrotalcite structure to be used as a catalyst in the reaction of the dry reforming of methane (DRM). Calcination at 450 °C provides the best conditions to prepare the most adapted structure and morphology to be later used in the DRM reaction. The samples were characterised by XRD, FTIR, SEM and it was shown that they exhibit a specific surface in the 30-70 g/cm2 and a crystallite size of approximately 20 nm. The results of the TPR analysis showed clearly that CoAl-HT has better catalytic performances than CoMgAl-HT. This result can be explained by the presence of the Co0 for the catalyst CoAl-HTc-R and the total absence in the sample CoMgAl-HTc-R. The solid CoMgAl-HTc-R requires high reduction temperature compared to CoAl-HTc-R due to the strong CoO-MgO interactions.

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Effect of La2O3 as a Promoter on the Pt,Pd,Ni/MgO Catalyst in Dry Reforming of Methane Reaction

Catalysts ◽

10.3390/catal10070750 ◽

2020 ◽

Vol 10 (7) ◽

pp. 750 ◽

Cited By ~ 1

Author(s):

Ali M. A. Al-Najar ◽

Faris A. J. Al-Doghachi ◽

Ali A. A. Al-Riyahee ◽

Yun Hin Taufiq-Yap

Keyword(s):

Carbon Deposition ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Precipitation Method ◽

Gravimetric Analysis ◽

Bet Method ◽

Spent Catalysts ◽

Ft Ir ◽

Co Precipitation ◽

Surfactant Assisted

Pt,Pd,Ni/MgO, Pt,Pd,Ni/Mg0.97La3+0.03O, Pt,Pd,Ni/Mg0.93La3+0.07O, and Pt,Pd,Ni/Mg0.85La3+0.15O (1% of each of the Ni, Pd, and Pt) catalysts were prepared by a surfactant-assisted co-precipitation method. Samples were characterized by the XRD, XPS, XRF, FT-IR, H2-TPR, TEM, the Brunauer–Emmett–Teller (BET) method, and TGA and were tested for the dry reforming of methane (DRM). TEM and thermal gravimetric analysis (TGA) methods were used to analyze the carbon deposition on spent catalysts after 200 h at 900 °C. At a temperature of 900 °C and a 1:1 CH4:CO2 ratio, the tri-metallic Pt,Pd,Ni/Mg0.85La3+0.15O catalyst with a lanthanum promoter showed a higher conversion of CH4 (85.01%) and CO2 (98.97%) compared to the Ni,Pd,Pt/MgO catalysts in the whole temperature range. The selectivity of H2/CO decreased in the following order: Pt,Pd,Ni/Mg0.85La3+0.15O > Pt,Pd,Ni/Mg0.93La3+0.07O > Pt,Pd,Ni/Mg0.97La3+0.03O > Ni,Pd,Pt/MgO. The results indicated that among the catalysts, the Pt,Pd,Ni/Mg0.85La23+0.15O catalyst exhibited the highest activity, making it the most suitable for the dry reforming of methane reaction.

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Cobalt–magnesia catalyst by oxalate co-precipitation method for dry reforming of methane under pressure

Catalysis Communications ◽

10.1016/j.catcom.2004.09.014 ◽

2004 ◽

Vol 5 (12) ◽

pp. 771-775 ◽

Cited By ~ 19

Author(s):

K. Omata ◽

N. Nukui ◽

T. Hottai ◽

M. Yamada

Keyword(s):

Dry Reforming ◽

Dry Reforming Of Methane ◽

Precipitation Method ◽

Co Precipitation

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Impact of Iron on the Fe–Co–Ni Ternary Nanocomposites Structural and Magnetic Features Obtained via Chemical Precipitation Followed by Reduction Process for Various Magnetically Coupled Devices Applications

Nanomaterials ◽

10.3390/nano11020341 ◽

2021 ◽

Vol 11 (2) ◽

pp. 341

Author(s):

Tien Hiep Nguyen ◽

Gopalu Karunakaran ◽

Yu.V. Konyukhov ◽

Nguyen Van Minh ◽

D.Yu. Karpenkov ◽

...

Keyword(s):

Particle Size ◽

Magnetic Properties ◽

Reduction Process ◽

Chemical Precipitation ◽

Precipitation Method ◽

Magnetic Characteristics ◽

Reduction Temperature ◽

Fe Content ◽

Magnetic Features ◽

Co Precipitation

This paper presents the synthesis of Fe–Co–Ni nanocomposites by chemical precipitation, followed by a reduction process. It was found that the influence of the chemical composition and reduction temperature greatly alters the phase formation, its structures, particle size distribution, and magnetic properties of Fe–Co–Ni nanocomposites. The initial hydroxides of Fe–Co–Ni combinations were prepared by the co-precipitation method from nitrate precursors and precipitated using alkali. The reduction process was carried out by hydrogen in the temperature range of 300–500 °C under isothermal conditions. The nanocomposites had metallic and intermetallic phases with different lattice parameter values due to the increase in Fe content. In this paper, we showed that the values of the magnetic parameters of nanocomposites can be controlled in the ranges of MS = 7.6–192.5 Am2/kg, Mr = 0.4–39.7 Am2/kg, Mr/Ms = 0.02–0.32, and HcM = 4.72–60.68 kA/m by regulating the composition and reduction temperature of the Fe–Co–Ni composites. Due to the reduction process, drastic variations in the magnetic features result from the intermetallic and metallic face formation. The variation in magnetic characteristics is guided by the reduction degree, particle size growth, and crystallinity enhancement. Moreover, the reduction of the surface spins fraction of the nanocomposites under their growth induced an increase in the saturation magnetization. This is the first report where the influence of Fe content on the Fe–Co–Ni ternary system phase content and magnetic properties was evaluated. The Fe–Co–Ni ternary nanocomposites obtained by co-precipitation, followed by the hydrogen reduction led to the formation of better magnetic materials for various magnetically coupled device applications.

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Template Induced Synthesis of Nano-Hydroxyapatite by Co-Precipitation Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.311-313.1713 ◽

2011 ◽

Vol 311-313 ◽

pp. 1713-1716 ◽

Cited By ~ 1

Author(s):

Yan Rong Sun ◽

Tao Fan ◽

Chang An Wang ◽

Li Guo Ma ◽

Feng Liu

Keyword(s):

Electron Microscope ◽

Chondroitin Sulfate ◽

Aspartic Acid ◽

Transmission Electron Microscope ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Structure And Morphology ◽

Transmission Electron ◽

Co Precipitation

Nano-hydroxyapatite with different morphology was synthesized by the co-precipitation method coupled with biomineralization using Ca(NO3)2•4H2O and (NH4)2HPO4 as reagents, adding chondroitin sulfate, agarose and aspartic acid as template. The structure and morphology of the prepared powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM).

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Bimetallic Ni-Co/SBA-15 catalysts prepared by urea co-precipitation for dry reforming of methane

Applied Catalysis A General ◽

10.1016/j.apcata.2018.01.033 ◽

2018 ◽

Vol 554 ◽

pp. 95-104 ◽

Cited By ~ 44

Author(s):

Jinni Xin ◽

Hongjie Cui ◽

Zhenmin Cheng ◽

Zhiming Zhou

Keyword(s):

Dry Reforming ◽

Dry Reforming Of Methane ◽

Co Precipitation

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In-situ Co-Precipitation of Ni-Mg-Al-LDH Catalytic Precursor on γ-Al2O3 for Dry Reforming of Methane: Synthesis and Evaluation

Acta Physico-Chimica Sinica ◽

10.3866/pku.whxb201503111 ◽

2015 ◽

Vol 31 (5) ◽

pp. 948-954 ◽

Cited By ~ 1

Author(s):

ZHANG Xiao-Qing ◽

◽

XU Yan YAN ◽

YANG Chun-Hui ◽

ZHANG Yan-Ping ◽

...

Keyword(s):

Dry Reforming ◽

Dry Reforming Of Methane ◽

Co Precipitation

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Evaluation of a Catalyst Durability in Absence and Presence of Toluene Impurity: Case of the Material Co2Ni2Mg2Al2 Mixed Oxide Prepared by Hydrotalcite Route in Methane Dry Reforming to Produce Energy

Materials ◽

10.3390/ma12091362 ◽

2019 ◽

Vol 12 (9) ◽

pp. 1362

Author(s):

Carole Tanios ◽

Cédric Gennequin ◽

Madona Labaki ◽

Haingomalala Lucette Tidahy ◽

Antoine Aboukaïs ◽

...

Keyword(s):

Catalytic Activity ◽

Mixed Oxide ◽

Active Sites ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

Side Reactions ◽

Commercial Catalyst ◽

Catalytic Sites ◽

Catalyst Durability ◽

Catalytic Performances

Ni, Co, Mg, and Al mixed-oxide solids, synthesized via the hydrotalcite route, were investigated in previous works toward the dry reforming of methane for hydrogen production. The oxide Co2Ni2Mg2Al2 calcined at 800 °C, Co2Ni2Mg2Al2800, showed the highest catalytic activity in the studied series, which was ascribable to an interaction between Ni and Co, which is optimal for this Co/Ni ratio. In the present study, Co2Ni2Mg2Al2800 was compared to a commercial catalyst widely used in the industry, Ni(50%)/Al2O3, and showed better activity despite its lower number of active sites, as well as lower amounts of carbon on its surface, i.e. less deactivation. In addition to this, Co2Ni2Mg2Al2800 showed stability for 20 h under stream during the dry reforming of methane. This good durability is attributed to a periodic cycle of carbon deposition and removal as well as to the strong interaction between Ni and Co, preventing the deactivation of the catalyst. The evaluation of the catalytic performances in the presence of toluene, which is an impurity that exists in biogas, is also a part of this work. In the presence of toluene, the catalytic activity of Co2Ni2Mg2Al2800 decreases, and higher carbon formation on the catalyst surface is detected. Toluene adsorption on catalytic sites, side reactions performed by toluene, and the competition between toluene and methane in the reaction with carbon dioxide are the main reasons for such results.

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