scholarly journals Effect of Support Particle Morphology of Ni Catalysts on Growth of Carbon Nanotubes by Methane Decomposition

2006 ◽  
Vol 49 (6) ◽  
pp. 308-314 ◽  
Author(s):  
Akinori Nakayama ◽  
Kouta Asai ◽  
Yoshiyuki Nagayasu ◽  
Shinji Iwamoto ◽  
Eriko Yagasaki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Particle Morphology ◽  
Methane Decomposition ◽  
Ni Catalysts ◽  
Support Particle ◽  
Effect Of Support

scholarly journals Effect of nanostructured supports on catalytic methane decomposition

2000 ◽  
Vol 72 (1-2) ◽  
pp. 327-331 ◽  
Author(s):  
L. Ji ◽  
S. Tang ◽  
P. Chen ◽  
H. C. Zeng ◽  
J. Lin ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Sol Gel ◽  
Methane Decomposition ◽  
Molar Ratio ◽  
Carbon Formation ◽  
Commercial Catalyst ◽  
Support Particle ◽  
Different Types ◽  
Support Size ◽  
Effect Of Support

Carbon deposition from catalytic methane decomposition has drawn increasing interest recently. Previously, we have found the carbon formation depends on the crystalline structure of the support, following the trend of Ni/CeO2 > Ni/CaO > Ni/MgO, because Ni supported on MgO is uniformly dispersed and can stabilize high-x CH x intermediates. We have also found that the addition of Pt can inhibit the carbon deposition on Co/Al2O3 because the alloying between Pt and Co results in the better dispersion of Co on the support. Furthermore, it was revealed that by judging the Ni/Mg molar ratio from 1 to 0.25 we could reduce the diameter of deposited carbon nanotubes from 20 to 12 nm, with substantially smaller production rate. All of these previous studies indicated that better dispersion of the supported metal would benefit the decreasing of carbon deposition. Here we present our recent investigation of the effect of support particle size on the carbon deposition. Three different types of 10 wt% Co/Al2O3 catalysts were prepared: Co on commercial Al2O3 (Cat 1), Co on sol-gel-processed Al2O3 (Cat 2), and sol-gel-made homogeneous Co-in-Al2O3 (Cat 3). TEM showed that the diameter of the Co3O4 particles in sol-gel Al2O3 is only around 6 nm, while it is 20-40 nm in the commercial catalyst. By using XRD and FTIR, Co was identified as crystalline Co3O4 in the as-prepared Cat 1 sample, CoAl2O4 in Cat 2, and amorphous Al2O3 in Cat 3, indicating the best dispersion in Cat 3. Methane CO2 reforming was studied on the three catalysts. Longer lifetime was measured for Cat 3 as compared to those on Cat 1 and Cat 2 (>20 h vs. 1 h). The support size effect is discussed.

Optimization of Carbon Nanotubes Synthesis via Methane Decomposition over Alumina-Based Catalyst

2010 ◽  
Vol 18 (3) ◽  
pp. 273-284 ◽  
Author(s):  
Kim-Yang Lee ◽  
Wei-Ming Yeoh ◽  
Siang-Piao Chai ◽  
Satoshi Ichikawa ◽  
Abdul Rahman Mohamed
Keyword(s):  
Carbon Nanotubes ◽  
Methane Decomposition

Catalytic decomposition of undiluted methane into hydrogen and carbon nanotubes over Pt promoted Ni/CeO2 catalysts

2018 ◽  
Vol 42 (18) ◽  
pp. 14843-14856 ◽  
Author(s):  
Manoj Pudukudy ◽  
Zahira Yaakob ◽  
Qingming Jia ◽  
Mohd Sobri Takriff
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Catalytic Decomposition ◽  
Methane Decomposition

A series of Pt promoted Ni/CeO2 catalysts were prepared and characterized, and their catalytic activity for methane decomposition was reported.

Effect of La, Ce and Nd oxides addition on the activity and stability of Co/MgO catalyst for methane decomposition into COx-free H2 production and carbon nanotubes

2018 ◽  
Vol 26 (9) ◽  
pp. 525-534 ◽  
Author(s):  
Ahmed E. Awadallah ◽  
Doaa S. El-Desouki ◽  
Samira M. Abdel-Azim ◽  
Noha A. K. Aboul-Gheit ◽  
Sohair M. Abdel-Hamid ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
H2 Production ◽  
Methane Decomposition

One-pot sol–gel synthesis of Ni/TiO2 catalysts for methane decomposition into COx free hydrogen and multiwalled carbon nanotubes

2017 ◽  
Vol 42 (26) ◽  
pp. 16495-16513 ◽  
Author(s):  
Manoj Pudukudy ◽  
Zahira Yaakob ◽  
Abudukeremu Kadier ◽  
Mohd Sobri Takriff ◽  
Nik Suhaimi Mat Hassan
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Sol Gel ◽  
Methane Decomposition ◽  
Multiwalled Carbon ◽  
One Pot ◽  
Free Hydrogen ◽  
Sol Gel Synthesis

Characterization of silica-supported Ni catalysts effective for methane decomposition by NiK-edge XAFS

2001 ◽  
Vol 8 (2) ◽  
pp. 587-589 ◽  
Author(s):  
Sakae Takenaka ◽  
Hitoshi Ogihara ◽  
Ichiro Yamanaka ◽  
Kiyoshi Otsuka
Keyword(s):  
Methane Decomposition ◽  
Ni Catalysts ◽  
Supported Ni Catalysts ◽  
Supported Ni
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