Halogen-promoted γ-alumina I. The interactions of 36Cl- and 14C-labelled carbon tetrachloride and of 36Cl- and 2H-labelled hydrogen chloride with γ-alumina

Thomson, John F.; Webb, G.; Winfield, John M.

doi:10.1016/0304-5102(91)85038-4

Cited by 40 publications

(10 citation statements)

References 26 publications

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“…Indeed, the process is favored by a permanent supply of HCl. Indeed the alumina surface may accommodate the HCl in a number of ways, dissociative or not, with a broad spectrum of desorption energies [20,22,23]. The TPD measurements amply confirm the occurrence of weakly and tightly bound Cl on our samples.…”

Section: Discussionsupporting

confidence: 65%

Pt/Al2O3-Cl catalysts derived from ethylaluminumdichloride

Ducourty¹,

Szabo²,

Dath³

et al. 2004

Applied Catalysis A: General

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Section: Discussionsupporting

confidence: 65%

Pt/Al2O3-Cl catalysts derived from ethylaluminumdichloride

Ducourty¹,

Szabo²,

Dath³

et al. 2004

Applied Catalysis A: General

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“…In fact, the surfaces of SRM exhaust particles have been found to contain inorganic chlorides, presumably from reaction with HC1 in the exhaust plume [Cofer eta!., 1989]. Previous work on alumina catalysts suggests that these surfaces should be more reactive than pristine aluminum oxide toward halocarbon adsorption [Thomson et al, 1991]. Finally, SRM exhaust particles also may be quite porous and thus contain far more surface area than assumed in these calculations.…”

Section: Presents a C Values And The Approximate Lifetimes Of Halocarmentioning

confidence: 94%

Decomposition of halomethanes on α‐alumina at stratospheric temperatures

Robinson

Freedman

Kolb

et al. 1994

Geophysical Research Letters

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We present data that suggest the possibility of a previously unsuspected heterogeneous process involving the decomposition of halocarhon source gases on alumina solid‐propellant rocket motor exhaust particles deposited in the stratosphere. These results, obtained under ultrahigh vacuum conditions, provide evidence that halomethane compounds undergo dissociative chemisorption on α‐alumina surfaces at stratospheric temperatures, leading to the release of more reactive halogen containing species. Simple calculations indicate that halocarbon concentrations will be severely depleted in the immediate wake of the rocket plume; any serious global impact at current projected launch rates requires the existence of one or more processes that regenerate active sites on the surface subsequent to the dissociative chemisorption of halocarbons.

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“…The reaction occurs also in the presence of solid aluminium trichloride that has been resublimed in vacuo; it consists of a rapid dehydrochlorination of CH 3 CCl 3 to give CH 2 CCl 2 followed by oligomerisation of the latter and further loss of HCl from the oligomeric mixture that coats the solid AlCl 3 surface [37]. Similar, though less violent, chemistry occurs when g-alumina, which has been chlorinated by CCl 4 in order to promote its surface Lewis and Brønsted acidity, is exposed to CH 3 CCl 3 [38]. Not surprisingly, g-alumina that has been fluorinated by SF 4 is also a suitably acidic surface on which to perform the chemistry.…”

Section: Dehydrochlorination Of Hydrochlorocarbons: the Use Of H 36 Cmentioning

confidence: 96%