Palladium–sulfated zirconium pillared montmorillonite: Catalytic evaluation in light naphtha hydroisomerization reaction

Issaadi, Rachid; Garin, F.; Chitour, C. E.

doi:10.1016/j.cattod.2005.11.063

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…This is because of their variety of potential applicability, low cost, and physicochemical properties. In this, advantages may be counted such as the swelling 2,3 with absorption of water 4 and specific molecules, 5 catalytic activity 6,7 in the formation of new structured catalysts, 7,8 cation exchangeability, 7,9 formation of composites, 10,11 and formation of regiospecific ribonucleotides 12 in biomedical applications, 13 etc. These materials contain lamellar structures with parallel layers of tetrahedral silicate and octahedral aluminate sheets.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of montmorillonite clays with modulable porosity induced with acids and superacids

et al. 2007

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The structural transformation of natural montmorillonite clay with different acids and superacids (hydrochloric, HCl; sulfuric, H 2 SO 4 ; hydrofluoric, HF; perchloric, HClO 4 ; chlorosulfonic, HSO 3 Cl; and trifluoromethanesulfonic, HSO 3 CF 3 acids) is evaluated by various techniques, allowing its full characterization. The process involves the modulated digestion of the aluminum and silicon atoms from the original clay without the loss of the original mass in the material from a careful drying methodology. The x-ray diffraction technique suggests that the process is disruptive, causing different magnitudes of modification, depending on the acidic source, taking the material with natural lamellar structure as reference. By 27 Al and 29 Si magnetic resonance, it is also shown that all the silicon and aluminum atoms were removed from the chemical structure to be physisorbed or dispersed in the interstices of the clay lattice when HF, HSO 3 Cl, and H 2 SO 4 acid treatments were carried out. However, with treatment of HClO 4 , the results suggest that only was achieved partial digestion and physisorption of the aluminosilicate core. Treatment with HCl led to a mild digestion that increased the laminar distance of the montmorillonite. Finally, HSO 3 CF 3 acid achieved a total disorder of the lamellar structure of the clay. In addition, by infrared spectrometry, the disappearance of the absorption peaks assigned to Al 2 OH, AlMgOH, and Al-O-Si are other evidence of the complete digestion of silicon and aluminum atoms caused by the acidic medium. On the other hand, the Brunauer-Emmett-Teller (BET) surface areas of the acidified clays showed a great enlargement in comparison with the unmodified clay. The porosimetry measurements demonstrate the presence of mesopores and hysteresis as observed in the physisorption isotherms, which indeed exhibited a capillary condensation into the porous structures. The present results are the first full characterization research and structural comparison between the acidic and the not-extensively-studied superacidic modified clays of this type.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of montmorillonite clays with modulable porosity induced with acids and superacids

et al. 2007

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“…Pd was selected as the active species owing to its potential catalytic applications for isomerizing hydrocarbons [25] and reducing the emission of NO x species [26][27][28][29]. …”

Section: Introductionmentioning

confidence: 99%

Synthesis of PdO/MCM-41 nanocomposites using trans-[PdCl2(PEt3)2] as the source of metal

Hernández-Pineda

Rı́o

Carreto

et al. 2009

Journal of Alloys and Compounds

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“…Since all kinds of unsaturated hydrocarbons play an important role in organic synthesis, the isomerization of double/triple bonds has been one of the highlights of transition‐metal‐catalyzed synthesis in terms of both academic curiosity and industrial interests 1. Certain transition metal complexes based on Fe,2–4 Pd,2, 3 Rh,4 Pt,5 Ni,3, 6 Ir,7 Ru,8–11 and Cr12, 13 are known as catalysts for isomerization. For instance, the Wilkinson catalyst (PPh 3 ) 3 RhCl is frequently employed in the isomerization of allylic ethers 14…”

Section: Introductionmentioning

confidence: 99%

Olefin isomerization reactions catalyzed by ruthenium hydrides bearing Schiff base ligands

Ding

Doorslaer

Cool

et al. 2011

Applied Organom Chemis

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A series of in situ-generated ruthenium hydride complexes Ru(PPh 3 ) 2 (CO)H(L n ) (n = a-h) incorporating a Schiff base ligand was investigated for the isomerization of olefins. 1 H-NMR was used to characterize the new hydride species in combination with 31 P-NMR. Allylbenzene and 1-octene were used as model substrates. Temperature, solvents and catalyst/substrate mole ratio were taken into account as parameters to optimize the isomerization reaction. All catalysts showed the best performance in 2-butanol, suggesting that the catalytic activity depends not only strongly on the steric and electronic environment of the ruthenium but also on the chosen solvent.

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Palladium–sulfated zirconium pillared montmorillonite: Catalytic evaluation in light naphtha hydroisomerization reaction

Cited by 13 publications

References 17 publications

Synthesis and characterization of montmorillonite clays with modulable porosity induced with acids and superacids

Synthesis and characterization of montmorillonite clays with modulable porosity induced with acids and superacids

Synthesis of PdO/MCM-41 nanocomposites using trans-[PdCl2(PEt3)2] as the source of metal

Olefin isomerization reactions catalyzed by ruthenium hydrides bearing Schiff base ligands

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