Comparison of Catalysts in Cracking Pure Methylcyclohexane and n-Decane

Plank, C. J.; Sibbett, Donald J.; Smith, Raymond B.

doi:10.1021/ie50568a041

Cited by 25 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The components were then dry ball-milled together for 16 to 24 hours. -Each catalyst (Tables I and II) was reduced in flowing hydrogen at atmospheric pressure for 2 hours at 450°F ., followed by 2 hours at 950°F ., and finally by 10 to 16 hours at 950°F. while in place in the high pressure reactor.…”

Section: Methodsmentioning

confidence: 99%

Platinum Hydrocracking of Pentanes, Hexanes, and Heptanes

Myers¹,

Munns²

1958

Ind. Eng. Chem.

View full text Add to dashboard Cite

Platinum on alumina catalysts have generally lower cracking activities than platinum on siliceous supports of equal dehydrogenation activity Platinum catalysts for pentane-hexane isomerization (2, 3) have acid sites and hydrogenation-dehydrogenation sites (2, 9, 12). The acid sites isomerize olefin intermediates made at the platinum dehydrogenation sites, the iso-olefin thus produced being hydrogenated at. the

show abstract

Section: Methodsmentioning

confidence: 99%

Platinum Hydrocracking of Pentanes, Hexanes, and Heptanes

Myers¹,

Munns²

1958

Ind. Eng. Chem.

View full text Add to dashboard Cite

show abstract

“…The nature of the active acid centers on a cracking catalyst has been a point of controversy for some years. While several investigators (6,7,15,16) have suggested that protonic acids are the active centers, others (4,9,10,13,14) have argued that Lewis acids are responsible for catalytic activity. The references cited are only a few of those bearing on this question.…”

Section: Modification Of Acid Strength Distribution By Adsorbedmentioning

confidence: 99%

Acid Strength Distribution Studies of Catalyst Surfaces.

Hirschler¹,

Schneider²

1961

J. Chem. Eng. Data

View full text Add to dashboard Cite

“…Mesoporous silica has been largely investigated in this field of research. The F − ions, generating ionic bonds, have been largely used to modify the surface chemistry of silica. − Fluorination is considered to be an important treatment for catalysts to improve their catalytic activity. It is known to modify surface acidity and subsequently the reactivity.…”

Section: Introductionmentioning

confidence: 99%

“…The CP technique is furthermore a valuable spectral editing tool that can be used to determine heteronuclear spatial proximities. Therefore in this paper, 1 H and 19 F magic angle spinning (MAS) and 1 H- 29 Si and 19 F- 29 Si CP-MAS NMR experiments have been performed to probe the local environments of H, F, and Si atoms. In addition, the chemical (water uptake) and thermal stabilities of these highly fluorinated silica have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Highly Fluorinated Silica Obtained by Direct F₂-Gas Fluorination: Stability and Unprecedented Fluorosilicate Species Revealed by Solid State NMR Investigations

et al. 2009

View full text Add to dashboard Cite

The direct F2-gas fluorination of mesoporous silica is a unique method leading to high fluorinated (up to 13 wt % F) and homogeneous powder with a controlled amount of grafted fluorine. Thermogravimetric analysis coupled with mass spectrometry for water, hydroxyl, and fluorine groups have allowed concluding that low fluorine-grafted silicas are thermically stable up to 550 °C whereas high fluorine-grafted silicas start to decompose from 250 °C with departure of SiF4 species. Water adsorption measurements have demonstrated the hydrophobic character of fluorinated silica and proved that direct fluorination is a way to control the hydrophilic−hydrophobic balance of silica. Pristine and fluorinated silicas have been studied by 19F and 1H MAS, and 1H−29Si and 19F−29Si CP-MAS NMR spectroscopies. NMR measurements have revealed various tetrahedral (O2/2SiF2, O3/2SiF) and pentahedral (O4/2SiF) fluorosilicate species previously observed in moderately fluorinated silica, and two unprecedented pentahedral species occurring in these highly fluorinated silica: O3/2SiF2 and O2/2SiF3 (δiso(19F) = −143.5 and −136.5 ppm; δiso(29Si) = −124 and −132 ppm, respectively). The occurrence of these unusual species, thanks to the coupling between the redox mechanism and an etching phenomenon provoked by direct F2-gas fluorination, should explain the thermal stability as well as the water affinity of fluorinated silica.

show abstract

Comparison of Catalysts in Cracking Pure Methylcyclohexane and n-Decane

Cited by 25 publications

References 5 publications

Platinum Hydrocracking of Pentanes, Hexanes, and Heptanes

Platinum Hydrocracking of Pentanes, Hexanes, and Heptanes

Acid Strength Distribution Studies of Catalyst Surfaces.

Highly Fluorinated Silica Obtained by Direct F₂-Gas Fluorination: Stability and Unprecedented Fluorosilicate Species Revealed by Solid State NMR Investigations

Contact Info

Product

Resources

About

Comparison of Catalysts in Cracking Pure Methylcyclohexane and n-Decane

Cited by 25 publications

References 5 publications

Platinum Hydrocracking of Pentanes, Hexanes, and Heptanes

Platinum Hydrocracking of Pentanes, Hexanes, and Heptanes

Acid Strength Distribution Studies of Catalyst Surfaces.

Highly Fluorinated Silica Obtained by Direct F2-Gas Fluorination: Stability and Unprecedented Fluorosilicate Species Revealed by Solid State NMR Investigations

Contact Info

Product

Resources

About

Highly Fluorinated Silica Obtained by Direct F₂-Gas Fluorination: Stability and Unprecedented Fluorosilicate Species Revealed by Solid State NMR Investigations