Striking Influence of the Catalyst Support and Its Acid–Base Properties: New Insight into the Growth Mechanism of Carbon Nanotubes

ACS Nano ◽  
2011 ◽  
Vol 5 (5) ◽  
pp. 3428-3437 ◽  
Author(s):  
Arnaud Magrez ◽  
Rita Smajda ◽  
Jin Won Seo ◽  
Endre Horváth ◽  
Primož Rebernik Ribic̆ ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Catalyst Support ◽  
Acid Base ◽  
Insight Into ◽  
Base Properties

An insight into the Meerwein–Ponndorf–Verley reduction of α,β-unsaturated carbonyl compounds: Tuning the acid–base properties of modified zirconia catalysts

2009 ◽  
Vol 268 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Francisco J. Urbano ◽  
María A. Aramendía ◽  
Alberto Marinas ◽  
José M. Marinas
Keyword(s):  
Carbonyl Compounds ◽  
Acid Base ◽  
Insight Into ◽  
Base Properties

Insight into the Hard−Soft Acid−Base Properties of Differently Substituted Phenylhydrazines in Reactions with Dimethyl Carbonate†

2008 ◽  
Vol 112 (46) ◽  
pp. 14525-14529 ◽  
Author(s):  
Anthony E. Rosamilia ◽  
Fabio Aricò ◽  
Pietro Tundo
Keyword(s):  
Dimethyl Carbonate ◽  
Acid Base ◽  
Soft Acid ◽  
Insight Into ◽  
Base Properties

Acid–Base Properties of N-Doped Carbon Nanotubes: A Combined Temperature-Programmed Desorption, X-ray Photoelectron Spectroscopy, and 2-Propanol Reaction Investigation

2016 ◽  
Vol 28 (19) ◽  
pp. 6826-6839 ◽  
Author(s):  
Klaus Friedel Ortega ◽  
Rosa Arrigo ◽  
Benjamin Frank ◽  
Robert Schlögl ◽  
Annette Trunschke
Keyword(s):  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Temperature Programmed Desorption ◽  
Acid Base ◽  
X Ray ◽  
Temperature Programmed ◽  
Base Properties

Corrigendum to “An insight into the Meerwein–Ponndorf–Verley reduction of a,b-unsaturated carbonyl compounds: Tuning the acid–base properties of modified zirconia catalysts” [J. Catal. 268 (2009) 79–88]

2010 ◽  
Vol 271 (1) ◽  
pp. 153 ◽  
Author(s):  
Francisco J. Urbano ◽  
Rafael Romero ◽  
María A. Aramendía ◽  
Alberto Marinas ◽  
José M. Marinas
Keyword(s):  
Carbonyl Compounds ◽  
Acid Base ◽  
Insight Into ◽  
Base Properties

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

Acid-base properties of borates under kraft pulp cooking conditions

2003 ◽  
Vol 18 (1) ◽  
pp. 90-94
Author(s):  
Per Ulmgren ◽  
Disa Tormund
Keyword(s):  
Kraft Pulp ◽  
Acid Base ◽  
Cooking Conditions ◽  
Base Properties

Effects of Acid-Base Properties of Oxide Catalysts on Transformation of 1,2-Propylene Glycol

2010 ◽  
Vol 31 (4) ◽  
pp. 441-446
Author(s):  
Zhengxi YU ◽  
Lei XU ◽  
Xinzhi ZHANG ◽  
Zhongmin LIU
Keyword(s):  
Propylene Glycol ◽  
Oxide Catalysts ◽  
Acid Base ◽  
Base Properties

Acid-base properties of 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan

1982 ◽  
Vol 47 (11) ◽  
pp. 2882-2889
Author(s):  
Nadezhda Likhareva ◽  
Ladislav Šůcha ◽  
Miloslav Suchánek
Keyword(s):  
Computer Program ◽  
Dissociation Constants ◽  
Acid Base ◽  
New Compounds ◽  
Base Properties

Two new compounds from the formazan series, viz. 1,3-diphenyl-5-(1H-tetrazol-2-yl)formazan and 1,3-diphenyl-5-(2H-1,2,4-triazol-3-yl)formazan, were prepared, and the dissociation constants and molar absorptivities of all of their acid-base species were determined spectrophotometrically employing the SPEKTFOT computer program.

Acid-base properties of metals and glasses of Na2O.P2O5-xB2O3 system

1984 ◽  
Vol 49 (10) ◽  
pp. 2355-2362 ◽  
Author(s):  
Juraj Leško ◽  
Marie Dorušková ◽  
Jan Tržil
Keyword(s):  
Boron Oxide ◽  
A Priori ◽  
Optical Basicity ◽  
Galvanic Cell ◽  
Acid Base ◽  
Tetrahedral Configuration ◽  
Relative Basicity ◽  
Base Theory ◽  
Base Properties

Boron oxide in the Na2O.P2O5-x B2O3 system behaves as a Lux base. Its addition to Na2O.P2O5 brings about transformation of a Co(II) indicator from octahedral to tetrahedral configuration, increase in the optical basicity ΛPb(II), increase in the relative basicity of the melt as determined by means of a galvanic cell, and depolymerization reactions releasing PO43- ions. In the Na2O-B2O3 system free of P2O5, boron oxide behaves as a Lux acid. The amphoretic nature of B2O3 is explained in terms of Lux's acid-base theory extended in analogy with the protolysis theory. The theoretical optical basicity values do not indicate the amphoretic behaviour of B2O3 because in this approach boron oxide is a priori regarded as more acidic than Na2O.P2O5.

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