Mechanism of FeZSM-5 milling and its effect on the catalytic performance in benzene to phenol oxidation

Харитонов, А. С.; Фенелонов, В. Б.; Voskresenskaya, T. P.; Рудина, Н. А.; Molchanov, V. V.; Plyasova, L. M.; Panov, G. I.

doi:10.1016/0144-2449(94)00019-o

Cited by 47 publications

(28 citation statements)

References 11 publications

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“…Generally, artificial zeolitic nanoparticles produce using "bottom-up" approaches by means of controlled growth of the crystallites under hydrothermal condition, which is considered as an expensive method due to materials consumed (especially organic template) and energy costs. The alternative approach is "topdown" strategy, in which the particle size can be reduced by means of mechanical approaches such as ball milling (Xie and Kaliaguine 1997;Accay et al 2004;Zielinski et al 1995;Kosanovic et al 1995;Kharitonov et al 1995;Kosanovic et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of BTEX Removal Using Granulated Surfactant-Modified Natural Zeolites Nanoparticles

Seifi

Torabian

Kazemian

et al. 2010

Water Air Soil Pollut

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Increasing release of organic pollutants to the environment has caused one of the largest world crises for water resources. Volatile organic compounds are toxic monoaromatic pollutants of soil and water. In this research, natural zeolite nanoparticles were produced mechanically by means of a milling technique, modified using two cationic surfactants of hexadecyltrimethylammonium chloride and n-cetyl pyridinium bromide and formed as granules using a novel technique already developed by our group. The granulated adsorbents were used to uptake benzene, toluene, ethylbenzene, and xylenes (BTEX) from contaminated water. Two intra-particle diffusion models (i.e., Weber and Morris and Vermeulen models) and three surface reaction models (i.e., pseudo-first order, pseudo-second order, and Elovich) were applied to evaluate the kinetics of adsorption and the best fitted model was chosen. Results of the adsorption kinetic evaluations were shown that uptake of granulated nanozeolites are higher than natural zeolites (in the order of four). Kinetic results revealed that the adsorption follows a pseudosecond order indicating existence of chemisorption in the studied conditions. It was noticed that the intraparticle diffusion is prevailing in the first stage of adsorption for a relatively short time (i.e., first 25 min).

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Section: Introductionmentioning

confidence: 99%

Kinetic Study of BTEX Removal Using Granulated Surfactant-Modified Natural Zeolites Nanoparticles

Seifi

Torabian

Kazemian

et al. 2010

Water Air Soil Pollut

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show abstract

“…All washcoated monoliths result in similar spectra, identifying different peaks assigned to ZSM-5 zeolite and cordierite. Previous studies [19,20] showed a rapid collapse of zeolite structure during dry ball milling. This phenomenon was disregarded in our samples as the characteristic diffraction peaks of zeolite were maintained in the monolithic samples.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Performance of Cu-ZSM-5 in a Coupled Monolith NSR-SCR System for NOx Removal in Lean-Burn Engine Exhaust

et al. 2015

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The viability of hybrid systems conformed by a combination of Pt-Ba/Al 2 O 3 NSR and Cu-ZSM-5 SCR catalysts is studied with both catalysts over monolithic structures in order to maximize the removal of NO x from lean-burn engines exhaust gases. To optimize performance of these coupled NSR-SCR systems, the NSR catalyst has to work under operational conditions completely different from those optimal when the NSR-only catalyst works, as in the coupled system the intermediate production of ammonia needs to be apparently increased, and then adsorbed in the SCR catalyst (Cu-ZSM-5) which is placed downstream in order to complete elimination of remaining NO x (NO?NO 2 ) selectively to N 2 with minimal amounts of other nitrogen derivates, i.e. N 2 O and NH 3 . The suitable control of operational conditions, specifically H 2 concentration and duration of the rich period, allows establishing the optimal working conditions of the NSR-SCR double system in the practical application, which resulted in temperature around 200°C and H 2 concentration in excess (3-4 %).

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“…Since 1983 there has been a lot of research concerning the hydroxylation of benzene with N 2 O to phenol [21][22][23][24][25][26][27][28][29]. G. I. Panov et al [25][26][27][28] found a correlation of the amount of iron in the ZSM-5 zeolite and the conversion of benzene with N 2 O to phenol.…”

Section: Activation Of the Oxidant By Lewis Acid Sites: Direct Hydroxmentioning

confidence: 99%

Oxidation reactions in the synthesis of fine and intermediate chemicals using environmentally benign oxidants and the right reactor system

Hoelderich

Kollmer

2000

Pure and Applied Chemistry

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This review outlines several approaches for designing new and environmentally friendly heterogeneously catalyzed oxidation processes for the synthesis of fine and intermediate chemicals. Environmentally benign oxidants such as molecular oxygen, hydrogen peroxide or nitrous oxide can be activated on suitable heterogeneous catalysts showing high activity and selectivity toward the desired oxygenated products. Several examples illustrate that features known from the synthesis of bulk chemicals can successfully be applied for manufacturing intermediate and specialty chemicals applying conventional industrial reactor systems. Direct oxidation of isoprenol, b-picoline, and benzene are chosen as examples for continuous gas-phase processes, oxidation of pinene and propylene as examples for semicontinuous or batchwise processes in the liquid phase.

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Mechanism of FeZSM-5 milling and its effect on the catalytic performance in benzene to phenol oxidation

Cited by 47 publications

References 11 publications

Kinetic Study of BTEX Removal Using Granulated Surfactant-Modified Natural Zeolites Nanoparticles

Kinetic Study of BTEX Removal Using Granulated Surfactant-Modified Natural Zeolites Nanoparticles

Performance of Cu-ZSM-5 in a Coupled Monolith NSR-SCR System for NOx Removal in Lean-Burn Engine Exhaust

Oxidation reactions in the synthesis of fine and intermediate chemicals using environmentally benign oxidants and the right reactor system

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