Mechanism of Cobalt Cluster Size Control in Co-MCM-41 during Single-Wall Carbon Nanotubes Synthesis by CO Disproportionation

2004 ◽  
Vol 108 (40) ◽  
pp. 15565-15571 ◽  
Author(s):  
Dragos Ciuparu ◽  
Yuan Chen ◽  
Sangyun Lim ◽  
Yanhui Yang ◽  
Gary L. Haller ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cluster Size ◽  
Size Control ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Cobalt Cluster ◽  
Co Disproportionation ◽  
Mcm 41

The effect of the cobalt loading on the growth of single wall carbon nanotubes by CO disproportionation on Co-MCM-41 catalysts

Carbon ◽  
2006 ◽  
Vol 44 (1) ◽  
pp. 67-78 ◽  
Author(s):  
Yuan Chen ◽  
Dragos Ciuparu ◽  
Sangyun Lim ◽  
Gary L. Haller ◽  
Lisa D. Pfefferle
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Cobalt Loading ◽  
Co Disproportionation ◽  
Mcm 41

Effect of Manganese Addition to the Co-MCM-41 Catalyst in the Selective Synthesis of Single Wall Carbon Nanotubes

2009 ◽  
Vol 113 (52) ◽  
pp. 21611-21620 ◽  
Author(s):  
Codruta Zoican Loebick ◽  
Salim Derrouiche ◽  
Nebojsa Marinkovic ◽  
Chuan Wang ◽  
Frank Hennrich ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Selective Synthesis ◽  
Single Wall Carbon ◽  
Mcm 41

Effect of reaction temperature in the selective synthesis of single wall carbon nanotubes (SWNT) on a bimetallic CoCr-MCM-41 catalyst

2010 ◽  
Vol 374 (1-2) ◽  
pp. 213-220 ◽  
Author(s):  
Codruta Zoican Loebick ◽  
Darlington Abanulo ◽  
Magda Majewska ◽  
Gary L. Haller ◽  
Lisa D. Pfefferle
Keyword(s):  
Carbon Nanotubes ◽  
Reaction Temperature ◽  
Single Wall Carbon Nanotubes ◽  
Selective Synthesis ◽  
Single Wall Carbon ◽  
Mcm 41

Statistical design of C10-Co-MCM-41 catalytic template for synthesizing smaller-diameter single-wall carbon nanotubes

2005 ◽  
Vol 86 (1-3) ◽  
pp. 303-313 ◽  
Author(s):  
Yanhui Yang ◽  
John D. York ◽  
Jingqian Xu ◽  
Sangyun Lim ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Statistical Design ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Mcm 41

scholarly journals Single wall carbon nanotubes growth over cobalt-iron mesoporous MCM-41 bimetallic catalyst under methane chemical vapor deposition, an experimental and DFT evaluation

2020 ◽  
Vol 25 (2) ◽  
pp. 227-246
Author(s):  
Frank Ramírez-Rodríguez ◽  
Betty López
Keyword(s):  
Activation Energy ◽  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Density Functional ◽  
Chemical Vapor ◽  
Photon Absorption ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Mcm 41

Cobalt and iron MCM-41 catalysts were synthesized through an in-situ incorporation process starting from commercial iron and cobalt nitrates. The incorporation was confirmed by diffuse reflectance UV spectroscopy (DRS-UV) inspecting the cobalt and iron silicate-like photon absorption features and comparing with pure MCM-41-Co and MCM-41-Fe catalysts. Additionally it was found that the incorporation of cobalt and iron does not compromise the mesoporous structure of MCM-41 as confirmed by N2 adsorption isotherms. All catalysts showed high surface areas (∼1100 m2g−1). Catalysts performance was conducted in a simple methane chemical vapor deposition (CVD) set up at 800 °C to produce single wall carbon nanotubes (SWCNT) under a constant flow of methane for 30 min. CVD products were characterized by thermogravimetric analysis (TGA) and Raman spectroscopy, finding that the iron content in the catalysts favors the selectivity and yield of graphitic-like structures, and confirming the presence of SWCNT by the appearance of a characteristic radial breathing mode (RBM) signals. These results were supported by Density Functional Theory (DFT) simulations of the methane dissociation (CH4 +TM → H3C –TMH) over Con (n = 1–5) and ComFe (m = 1–4), finding a different activation energy trend where ComFe (m = 1–4) clusters have the lower activation energy. The DFT study also revealed a charge difference (δC − δTM) higher in the case of dissociation over ComFe (m = 1–4) which may lead to an electrostatic stabilization of the transition metal, diminishing the activation energy of those clusters and leading to a faster carbon uptake.

Effect of chromium addition to the Co-MCM-41 catalyst in the synthesis of single wall carbon nanotubes

2009 ◽  
Vol 368 (1-2) ◽  
pp. 40-49 ◽  
Author(s):  
Codruta Zoican Loebick ◽  
Salim Derrouiche ◽  
Fang Fang ◽  
Nan Li ◽  
Gary L. Haller ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Chromium Addition ◽  
Mcm 41
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