Selectivity in heterogeneous catalytic processes

Landau, Miron V.; Kogan, S. B.; Tavor, Dorith; Herskowitz, M.; Koresh, Jacob E.

doi:10.1016/s0920-5861(96)00240-4

Cited by 27 publications

(5 citation statements)

References 24 publications

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“…Both of the Surf-Fe 3+ and Bulk-Fe 3+ may act as catalytic centers with '' shape selectivity '' characteristics similar to that of zeolite. 24 The special surface state of the Q-TiO 2 /Fe 3+ nanoparticles could favor the selective oxidation of cyclohexane into cyclohexanol instead of cyclohexanone. It could also be noticed from Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and photocatalytic oxidation properties of iron doped titanium dioxide nanosemiconductor particles

2003

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Section: Resultsmentioning

confidence: 99%

Synthesis and photocatalytic oxidation properties of iron doped titanium dioxide nanosemiconductor particles

2003

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“…38 H-complexes were formed by hydrogen bonding between nitrogen tetraoxide (N 2 O 4 ) and the surface OH group of the solid acid. 38 H-complexes were formed by hydrogen bonding between nitrogen tetraoxide (N 2 O 4 ) and the surface OH group of the solid acid.…”

Section: Effects Of the Amount Of Catalyst On The Nitration Reactionmentioning

confidence: 99%

“…Generally, the reaction mechanism for the liquid phase nitration of aromatic hydrocarbon with NO 2 (or N 2 O 4 ) over a solidacid catalyst was regarded as the electrophilic attack mechanism. 38 H-complexes were formed by hydrogen bonding between nitrogen tetraoxide (N 2 O 4 ) and the surface OH group of the solid acid. And then the H-complexes are likely to coexist in equilibrium with nitronium ions (NO 2 + ), which easily attack the aromatic ring via electrophilic reaction.…”

Section: Effects Of the Amount Of Catalyst On The Nitration Reactionmentioning

confidence: 99%

H₃PW₁₂O₄₀ synergized with MCM-41 for the catalytic nitration of benzene with NO₂ to nitrobenzene

et al. 2015

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Developing a new environmentally friendly process for benzene nitration to nitrobenzene has been highly desirable for a long time. In this work, NO 2 was used as a nitration agent to replace traditional nitric acid, and different mesoporous SiO 2 and their supported heteropoly acid (salt) were employed to catalyze benzene nitration to nitrobenzene. Several typical catalysts were characterized using XRD, BET and FT-IR, and the acid amounts of the various catalysts were determined. The effects of various factors such as different catalysts, the molar ratio of benzene to NO 2 , reaction temperature, reaction time, HPW loading, the acid amounts of the catalyst and the reuse of the catalyst on the nitration reaction have also been systematically examined. The results indicate that the supported HPW/MCM-41 catalysts exhibit a remarkably synergistic catalytic performance on the nitration reaction of benzene to nitrobenzene. In particular, the 50%HPW/MCM-41 catalyst gives the best results with 73.4% benzene conversion and 98.8% selectivity to nitrobenzene under the optimal reaction conditions. Moreover, the mesoporous structure of MCM-41 was retained under the high loading of HPW. The possible reaction mechanism for the nitration reaction of benzene with NO 2 over HPW/MCM-41 is suggested in the present work. This method provides a promising strategy for the preparation of nitro-aromatic compounds from a catalytic nitration reaction by using NO 2 as the nitration reagent.

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“…HBEA, which contains acid sites of On another hand, the product distribution can also be modified by shape selectivity. Even though it has been claimed that zeolites (HY, HZSM5 and HBEA) that yielded p-xylene selectively in toluene methylation did not display shape selectivity in the alkylation of phenol with methanol [9], selective formation of p-cresol…”

Section: Accepted Manuscriptmentioning

confidence: 99%

m-Cresol methylation: Role of internal and external acid sites in the product distribution

Acevedo

Montañez-Valencia

Okulik

et al. 2017

Catalysis Communications

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Selectivity in heterogeneous catalytic processes

Cited by 27 publications

References 24 publications

Synthesis and photocatalytic oxidation properties of iron doped titanium dioxide nanosemiconductor particles

Synthesis and photocatalytic oxidation properties of iron doped titanium dioxide nanosemiconductor particles

H₃PW₁₂O₄₀ synergized with MCM-41 for the catalytic nitration of benzene with NO₂ to nitrobenzene

m-Cresol methylation: Role of internal and external acid sites in the product distribution

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Selectivity in heterogeneous catalytic processes

Cited by 27 publications

References 24 publications

Synthesis and photocatalytic oxidation properties of iron doped titanium dioxide nanosemiconductor particles

Synthesis and photocatalytic oxidation properties of iron doped titanium dioxide nanosemiconductor particles

H3PW12O40 synergized with MCM-41 for the catalytic nitration of benzene with NO2 to nitrobenzene

m-Cresol methylation: Role of internal and external acid sites in the product distribution

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H₃PW₁₂O₄₀ synergized with MCM-41 for the catalytic nitration of benzene with NO₂ to nitrobenzene