Catalysis Communications

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EPR and XRD as probes for activity and durability of LaMnO ₃ perovskite-like catalysts

C. Oliva, L. Forni

Catalysis Communications > 2000 > 1 > 1-4 > 5-8

Four different LaMnO ₃ perovskites were prepared by different procedures, characterised and tested for the catalytic flameless combustion of methane. EPR and XRD have been found useful probes for testing activity and durability of the catalysts, respectively. Broader EPR lines correspond to more active catalysts, while high crystallinity indicates long-lived samples.

article

Sol-gel derived hybrid materials as heterogeneous catalysts for the epoxidation of olefins

Kai Dallmann, Regina Buffon

Catalysis Communications > 2000 > 1 > 1-4 > 9-13

CH ₃ ReO ₃ has been heterogenized inside the porous system of hybrid silica matrixes via the sol-gel method using 1,4-bis(triethoxysilyl)benzene as a co-condensation agent and 4-((3-triethoxysilyl)propylamino)pyridine hydrochloride as a hydrolysable ligand. The resulting solids are stable and recyclable epoxidation catalysts.

article

Index

Catalysis Communications > 2000 > 1 > 1-4 > 37

article

First evidences on the stability of nitride species in ALPON catalysts

Francisco Márquez, Rut Guil-López, Vicente Fornés, Avelino Corma

Catalysis Communications > 2000 > 1 > 1-4 > 21-24

An unexpected reversible conversion between -NH ₂ and N ³ ^- species in aluminophosphate oxynitride (ALPON) has been found during thermal treatments and subsequent exposition to moist air.

article

Ruthenium complex-catalyzed hydroformylation of alkenes with carbon dioxide

Ken-ichi Tominaga, Yoshiyuki Sasaki

Catalysis Communications > 2000 > 1 > 1-4 > 1-3

Carbon dioxide can be used as a reactant for the hydroformylation of alkenes. The ruthenium complexes derived from H ₄ Ru ₄ (CO) ₁ ₂ and LiCl effectively catalyze the hydroformylation of cyclohexene with CO ₂ to give hydroxymethylcyclohexane with a yield of 88%.

article

An artificial substrate for undecaprenyl diphosphate synthase from Micrococcus luteus B-P 26

Masahiko Nagaki, Shunsuke Sato, Yuji Maki, Tokuzo Nishino, more

Catalysis Communications > 2000 > 1 > 1-4 > 33-35

In order to investigate the reactivity of the homologs of homoallylic substrates, we examined the enzymatic reactions of E- or Z-3-methylhex-3-enyl diphosphate with farnesyl diphosphate using the undecaprenyl diphosphate synthase (UPS) of Micrococcus luteus B-P 26. E-3-methylhex-3-enyl diphosphate reacted with farnesyl diphosphate to give a chiral (4S)-(2Z,6E,10E,14E)-4-ethyl-3,7,11,15-tetramethylhexadeca-2,6,10,14-tetraen...

article

Transformation of cinchonidine during the enantioselective hydrogenation of ethyl pyruvate to ethyl lactate

V. Morawsky, U. Prüße, L. Witte, K.-D. Vorlop

Catalysis Communications > 2000 > 1 > 1-4 > 15-20

The transformation of cinchonidine (CIN) during the enantioselective hydrogenation of ethyl pyruvate on Pt/Al ₂ O ₃ was investigated. Under reaction conditions, cinchonidine was hydrogenated consecutively first at the quinuclidine part and then at the quinuline ring. However, the hydrogenation of the aromatic ring system, causing a drop in activity and enantioselectivity, did not begin...

article

Editorial

B. Lüecke

Catalysis Communications > 2000 > 1 > 1-4 > v-vi

article

Raman and kinetic evidence of NO ₂ ⁺ ion in solid acid catalysts

Nunziata Clara Marziano, Lucio Ronchin, Sabina Ronchin, Maurizio Ferrari

Catalysis Communications > 2000 > 1 > 1-4 > 25-31

Samples of H ₂ SO ₄ /SiO ₂ loaded with HNO ₃ and analysed by Raman spectroscopy exhibit the band of the NO ₂ ⁺ ion, which is formed by the protonation-dehydration equilibrium of HNO ₃ in strong acidic media. The effectiveness of NO ₂ ⁺ as a nitrating species is tested in the nitration of aromatic compounds towards substrates with high...

article

Gallium-containing zeolites - valuable catalysts for the conversion of cycloalkanes into a premium synthetic steamcracker feedstock

Andreas Raichle, Stefan Moser, Yvonne Traa, Michael Hunger, more

Catalysis Communications > 2001 > 2 > 1 > 23-29

Gallium is incorporated into zeolite H-ZSM-5 by reductive solid-state ion exchange, i.e., by heating a physical mixture of gallium oxide and H-ZSM-5 in a hydrogen flow at 600 ^o C. The samples are characterized by AES/ICP, XRD, FTIR and MAS NMR spectroscopy. Methylcyclohexane is converted over these catalysts in a hydrogen atmosphere at 6 MPa and 250 to 400 ^o C, yielding a high-quality...

article

Oxidative carbonylation of phenol to diphenyl carbonate catalyzed by bis(benzonitrile)dichloropalladium in the presence of polyvinylpyrrolidone

Hirotoshi Ishii, Mitsuru Ueda, Kazuhiko Takeuchi, Michihiko Asai

Catalysis Communications > 2001 > 2 > 1 > 17-22

Pd(PhCN) ₂ Cl ₂ [bis(benzonitrile)dichloropalladium] were investigated in the presence of polyvinylpyrrolidone (PVP) as a polymer support for the direct synthesis of diphenyl carbonate (DPC) by the oxidative carbonylation of phenol using carbon monoxide (CO) and air. Pd(PhCN) ₂ Cl ₂ was found to be more efficient than the conventional PdBr ₂ system, and its...

article

The liquid-phase reaction of hexane on acid mordenite

Dan Fǎrcaşiu, Kyong-Hwan Lee

Catalysis Communications > 2001 > 2 > 1 > 5-9

The batch reaction of hexane (H) on acid Mordenite at 160 ^o C does not occur by consecutive carbocationic isomerization (H->2MP,3MP->2,3DMB->2,2DMB). Instead, a mixture of all the isomers in constant ratios was obtained at all conversions between 2% and 13%, as expected for quenching or desorption of an equilibrium mixture. The ratios of the monobranched isomers to the dibranched...

article

Photoassisted detoxification of organic pollutants on the surface modified TiO ₂ semiconductor particulate system

Debabrata Chatterjee, Anima Mahata

Catalysis Communications > 2001 > 2 > 1 > 1-3

Photoassisted decomposition of phenol, chlorophenol and trichloroethylene in waste water has been achieved on the surface of TiO ₂ semiconductor modified with 8-hydroxyquinoline (HOQ) by using visible light. After 5 h of irradiation with a 50 W tungsten lamp, over 70-80% degradation of pollutants is achieved. A working mechanism involving excitation of surface bound dye, followed by charge...

article

Stabilisation of β-NiMoO ₄ in TiO ₂ -supported catalysts

Rodica Zãvoianu, Cristina R. Dias, M. Farinha Portela

Catalysis Communications > 2001 > 2 > 1 > 37-42

NiMoO ₄ catalysts supported on TiO ₂ (anatase) were prepared using two procedures: (i) wet impregnation of the support with an aqueous suspension of NiMoO ₄ and (ii) direct precipitation of NiMoO ₄ on the support surface using solutions of nickel nitrate and ammonia heptamolybdate. The catalysts and their precursors were characterised by XRD and TG/DTA and the catalytic...

article

Non-oxidative conversion of methane to aromatics over modified Mo/HZSM5 catalysts

S. Tang, H. Chen, J. Lin, K.L. Tan

Catalysis Communications > 2001 > 2 > 1 > 31-35

The effects of HZSM5 Si/Al ratio, cobalt additive and HCl-acidified pretreatment on methane conversion and selectivity to aromatics have been investigated for non-oxidative conversion of methane to aromatics. The HZSM5 (E) with low Si/Al ratio (Si/Al=20) has better methane conversion and benzene selectivity than HZSM5 (D) (Si/Al=55). The synergistic effect is exhibited in 3% Mo-1% Co-HCl/HZSM5 (E)...

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Effective methane reforming with CO ₂ and O ₂ under pressurized condition using NiO-MgO and fluidized bed reactor

Keiichi Tomishige, Yuichi Matsuo, Yasushi Sekine, Kaoru Fujimoto

Catalysis Communications > 2001 > 2 > 1 > 11-15

Circulation of Ni ₀ _. ₁ ₅ Mg ₀ _. ₈ ₅ O catalyst particles in the fluidized bed reactor gave much higher CH ₄ conversion in methane reforming with CO ₂ and O ₂ under pressurized condition than the case of the catalyst without moving in the fixed bed reactor. In addition, circulation of the catalyst particles in the fluidized bed reactor...

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Influence of the aluminum content of zeolite H-ZSM-5 on the conversion of methylcyclohexane into a high-quality synthetic steamcracker feedstock

Andreas Raichle, Michael Ramin, Dirk Singer, Michael Hunger, more

Catalysis Communications > 2001 > 2 > 2 > 69-74

Methylcyclohexane is converted into a high-quality synthetic steamcracker feedstock over zeolites H-ZSM-5 with different n _A _l /(n _A _l +n _S _i ) ratios. With increasing aluminum content, increasing conversion but slightly decreasing selectivities to the desired n-alkanes (maximal 78%, without methane) are observed at 400 ^o C. Mechanistic aspects of the reaction...

article

Promoting effect of noble metals to Co/SiO ₂ catalysts for hydroformylation of 1-hexene

Xianqing Qiu, Noritatsu Tsubaki, Shouli Sun, Kaoru Fujimoto

Catalysis Communications > 2001 > 2 > 2 > 75-80

Small amount of Pt, Pd and Ru promoters in Co/SiO ₂ led to great improvement of catalyst activity for hydroformylation of 1-hexene. The 1-hexene conversion as high as 89.7% and oxygenate products selectivity of 88.9% were obtained after 2 h reaction over Pd promoted Co/SiO ₂ catalyst. The increasing of reduction degree, the minimizing of cobalt particle size and the enhancement of...

article

Based CoMo sulphided catalysts supported on hydroxyapatite: Dimethyldisulphide (DMDS) hydrogenolysis

Y. Saih, M. Ait Chaoui, A. Ezzamarty, M. Lakhdar

Catalysis Communications > 2001 > 2 > 2 > 81-87

A series of Ca-deficient and Co-containing hydroxyapatite samples, noted A _r and C _x , respectively, where r is the total Ca/P molar ratio (r=1.46-1.62) and x the Co wt%, were prepared by precipitation in aqueous media. The catalytic activities of CoMo/A _r and Mo/C _x sulphided catalysts have been examined for the S-S bond hydrogenolysis of dimethyldisulphide (DMDS)...

article

Synthesis of mesoporous SiO ₂ -ZrO ₂ mixed oxides by sol-gel method

C. Flego, L. Carluccio, C. Rizzo, C. Perego

Catalysis Communications > 2001 > 2 > 2 > 43-48

A series of SiO ₂ -ZrO ₂ mixed oxides were prepared by sol-gel method in the presence of directing agent, with variable amounts of ZrO ₂ between pure silica and pure zirconia, with the aim to obtain catalytic materials suitable as solid acid catalysts. SiO ₂ -ZrO ₂ mixed oxides differ from the two pure starting oxides. While SiO ₂ has a low OH density...

INFONA - science communication portal

Catalysis Communications

EPR and XRD as probes for activity and durability of LaMnO ₃ perovskite-like catalysts

Sol-gel derived hybrid materials as heterogeneous catalysts for the epoxidation of olefins

Index

First evidences on the stability of nitride species in ALPON catalysts

Ruthenium complex-catalyzed hydroformylation of alkenes with carbon dioxide

An artificial substrate for undecaprenyl diphosphate synthase from Micrococcus luteus B-P 26

Transformation of cinchonidine during the enantioselective hydrogenation of ethyl pyruvate to ethyl lactate

Editorial

Raman and kinetic evidence of NO ₂ ⁺ ion in solid acid catalysts

Gallium-containing zeolites - valuable catalysts for the conversion of cycloalkanes into a premium synthetic steamcracker feedstock

Oxidative carbonylation of phenol to diphenyl carbonate catalyzed by bis(benzonitrile)dichloropalladium in the presence of polyvinylpyrrolidone

The liquid-phase reaction of hexane on acid mordenite

Photoassisted detoxification of organic pollutants on the surface modified TiO ₂ semiconductor particulate system

Stabilisation of β-NiMoO ₄ in TiO ₂ -supported catalysts

Non-oxidative conversion of methane to aromatics over modified Mo/HZSM5 catalysts

Effective methane reforming with CO ₂ and O ₂ under pressurized condition using NiO-MgO and fluidized bed reactor

Influence of the aluminum content of zeolite H-ZSM-5 on the conversion of methylcyclohexane into a high-quality synthetic steamcracker feedstock

Promoting effect of noble metals to Co/SiO ₂ catalysts for hydroformylation of 1-hexene

Based CoMo sulphided catalysts supported on hydroxyapatite: Dimethyldisulphide (DMDS) hydrogenolysis

Synthesis of mesoporous SiO ₂ -ZrO ₂ mixed oxides by sol-gel method

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