Organic Catalysis over Crystalline Aluminosilicates

Venuto, P.B.; Landis, Phillip S.

doi:10.1016/s0360-0564(08)60430-7

Cited by 302 publications

(107 citation statements)

References 104 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because transformation of ethanol into ether on small pore zeolites is restricted (Venuto & Landys, 1968), its formation in this case is surprising. On the basis of the general reaction pathway proposed by Kn6zinger & KOhne (1966) and taking into account the void dimension of the channels of the zeolite, ether is probably formed on the external surface of the crystals (secondary porosity).…”

Section: Catalytic Activitymentioning

confidence: 91%

Physicochemical and Catalytic Properties of a Modified Natural Clinoptilolite

et al. 1994

View full text Add to dashboard Cite

Samples of natural clinoptilolite modified by treatment with NH4C1 or HCI solutions, followed by thermal treatments, have been characterized, and their catalytic activity evaluated, in o-xylene isomerization and ethanol dehydration reactions. The substitution of the compensating cations by NH4 ~ does not produce structural changes in the original material, but it opens the channels and increases its acidity and thermal stability. The treatment with HCI increases both the acidity and the effective diameter of the channels and pores but it produces an important loss of zeolite phase. Calcination of the acidic forms above 973 K leads to the breakdown of the zeolite structure. Catalytic activity of the samples is related to the surface acidity. For the original and NH4Cl-treated samples, however, the conversion of o-xylene is limited by the access of the reactant inside the channels of the zeolite. A comparative study with modified sepiolite in dehydration of ethanol has also been performed.

show abstract

Section: Catalytic Activitymentioning

confidence: 91%

Physicochemical and Catalytic Properties of a Modified Natural Clinoptilolite

et al. 1994

View full text Add to dashboard Cite

show abstract

“…The success of zeolites in second generation intermediary chemistry and fine chemicals [63][64][65][66][67][68][69][70][71][72][73] are on the whole, more recent [63-70, 72, 73] and benefit from the zeolitic materials developed mostly for the first two industries. Significant improvements of these materials are still possible, and new applications using new materials or not yet used so far, will be emerging in the coming decades.…”

Section: Openings For Zeolites In Refining and Petrochemicalsmentioning

confidence: 99%

Evolution of refining and petrochemicals. What is the place of zeolites

Marcilly

2001

Studies in Surface Science and Catalysis

View full text Add to dashboard Cite

Résumé -Évolution du raffinage et de la pétrochimie. Place des zéolithes -Dans une première partie, cet article décrit l'évolution passée (sur les deux ou trois dernières décennies) du raffinage et de la pétrochimie et tente de dégager les principales tendances de leur évolution à moyen et long terme. Il décrit ensuite les principaux défis que cette évolution place sur la route des acteurs du raffinage et de la pétrochimie. Dans une seconde partie, il présente le marché des catalyseurs de ces deux domaines et le compare à celui des catalyseurs en général. Il présente ensuite le marché des zéolithes quelles que soient leurs applications industrielles (détergents, adsorption ou catalyse) et décline l'ensemble de ces applications en raffinage et pétrochimie. Il décrit l'évolution prévisible du marché des zéolithes et tente de dégager quelques directions possibles de progrès pour les zéolithes dans les activités de catalyse et adsorption appliquées au raffinage et à la pétrochimie.Mots-clés : raffinage, pétrochimie, procédés catalytiques, hydrogène, soufre, dioxyde de carbone (CO 2 ), aromatiques, marché des catalyseurs, marché des zéolithes (dans les détergents, comme catalyseurs et comme adsorbants). Abstract -Evolution of Refining and Petrochemicals: What is the Place of Zeolites -The first part of this paper presents the evolution of the refining and petrochemical industries during the last two or three decades and the principal trends of their evolution in the medium

show abstract

“…The high degree of isotopic exchange of H from lattice hydroxyls of TED2+-smectite when exposed to D20 at 100~ confirms the lability of H + associated with the TED 2 § cations. The more limited proton transfer observed with C6D6 however, may suggest a lower proton lability than that of some zeolites (Venuto and Landis, 1968). A number of attempts to obtain isomerization of 1-hexene on the TED 2+ smectite were unsuccessful, again suggesting a limited Bronsted acidity for this system.…”

Section: Discussionmentioning

confidence: 90%

“…At 100~ at least half of the structural hydroxyls became deuterated upon reaction of the TED 2 +-smectite with (Russell andFraser, 1971 andYariv andHeller-Kallai, 1973) indicating smectites with high Bronsted acidity may easily exchange protons from structural hydroxyls with surface hydrogen ions. Isotopic exchange reactions of benzene over zeolites have been studied (Venuto and Landis, 1968) where zeolites with D + as the exchange cation were utilized. In this work deuterobenzene was utilized and the degree of exchange monitored by observing the appearance of deuterated structural hydroxyl groups.…”

Section: Deuterobenzene and Deuterium Oxide Experimentsmentioning

confidence: 99%

Triethylene Diamine-Clay Complexes as Matrices for Adsorption and Catalytic Reactions

Mortland

1976

Clays and clay miner.

View full text Add to dashboard Cite

-Complexes of 1,4-diazabicyclo [2.2.2] octane (triethylene diamine) with smectite and vermiculite were made for the purpose of exposing the internal surfaces of the clays for adsorption of gases and possible catalytic activity. When the diprotonated form of the amine saturated the exchange sites, internal surfaces of the clays were found to be available to nitrogen, ethane, and 2,4-dimethyl pentane. Proton lability in the smectites was studied with NHa, D20, and C6D6 experiments. Catalytic function was demonstrated in the conversion of acetonitrile to acetamide in the smectite.

show abstract

Organic Catalysis over Crystalline Aluminosilicates

Cited by 302 publications

References 104 publications

Physicochemical and Catalytic Properties of a Modified Natural Clinoptilolite

Physicochemical and Catalytic Properties of a Modified Natural Clinoptilolite

Evolution of refining and petrochemicals. What is the place of zeolites

Triethylene Diamine-Clay Complexes as Matrices for Adsorption and Catalytic Reactions

Contact Info

Product

Resources

About