Isomerization of α-pinene over dealuminated ferrierite-type zeolites

Rachwalik, R.; Olejniczak, Zbigniew; Jiao, Jian; Huang, Jun; Hunger, Michael; Sulikowski, Bogdan

doi:10.1016/j.jcat.2007.10.001

Cited by 108 publications

(84 citation statements)

References 22 publications

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“…The Ni loading was too low to give rise to reflections in the XRD patterns. 27 Al MAS NMR spectroscopy is known [31][32][33] as an efficient probe to determine the coordination and local structure of specific aluminium species in zeolite materials. Both Lewis sites and the effect of dealumination on HY zeolites has been also evidenced by this technique [34,35].…”

Section: -Textural Structural and Morphological Properties Of The Frmentioning

confidence: 99%

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Rossetti

Compagnoni

Finocchio

et al. 2017

Applied Catalysis B: Environmental

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After a preliminary thermodynamic investigation, proper operating conditions have been selected to maximise ethylene productivity by ethanol dehydration and limit side products such as coke and higher olefins or oxygenates. We focused on the possibility to operate with a diluted bioethanol solution (ca. 50 wt%), which represents a promising and convenient raw material, obtainable by simple flash concentration of the fermentation broth. Furthermore, water addition to the ethanol dehydration reactor may help preventing catalyst coking and diethyl ether formation, although affecting the thermodynamic products distribution. A proof of concept for an ethanol dehydration process using diluted ethanol is also provided through process simulation. Catalysts based on a BEA zeolite have been compared, characterised by different acidity imparted by dealumination treatments. Ni addition in variable loading helped suppressing undesired byproducts, difficult to separate from ethylene. For instance, no trace of diethyl ether nor acetaldehyde has been observed for the Ni-loaded samples under optimised working conditions. Catalyst characterisation by FT IR allowed correlating a high selectivity to ethylene with the acid sites nature of the catalyst, whereas the presence of extraframework Lewis acidic sites induced faster coke formation. Durability was finally checked on the most active and selective catalyst evidencing stable operation for 80 h-on-stream and without evidence of coke deposition, as determined after characterisation of the spent samples. A γ-Al2O3 catalyst has been tested as benchmark under the same conditions

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Section: -Textural Structural and Morphological Properties Of The Frmentioning

confidence: 99%

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Rossetti

Compagnoni

Finocchio

et al. 2017

Applied Catalysis B: Environmental

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“…Various acidic catalysts, such as oxides [2,3], oxides treated with acids [4], zeolites [5][6][7][8][9][10][11][12], mesoporous materials [12][13][14], activated clays [15][16][17][18][19], resins [20,21] and heteropolyacids [22], have been explored in isomerization of a-pinene. Currently, the acid-impregnated TiO 2 is used as an industrial catalyst for this purpose, but due to the low rate of the reaction, there is still a great interest in developing novel, viable contacts for the process.…”

Section: Introductionmentioning

confidence: 99%

“…While acidic solutions generally result in removal of (some) aluminium from tetrahedral positions of zeolites, giving dealuminated materials [5,24,25], treatment with alkali solutions might bring about various results, depending on the conditions used. For example, treatment with potassium aluminate realuminates the zeolite just under medium conditions, if aluminium source is available as extraframework species or added deliberately to a solution [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Properties of Desilicated ZSM-5, ZSM-12, MCM-22 and ZSM-12/MCM-41 Derivatives in Isomerization of α-Pinene

2008

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Limited information is available on the isomerization of a-pinene proceeding on zeolites and related desilicated materials. We wish therefore to report on the title reaction proceeding over ZSM-5, ZSM-12 and MCM-22 type zeolites, parent and modified by the sodium hydroxide treatment. The NaOH solutions of various concentrations (0.05-1 M) were used as a desilicating agent. Such treatments with basic solutions were applied: (i) under atmospheric pressure, and (ii) under hydrothermal conditions. It was shown that ZSM-12 was more resistant towards the basic solutions treatment, and its structure was retained over a whole range of NaOH concentrations studied. Nitrogen sorption revealed strong influence of the desilication process on the pore structure of modified materials-the mesopores system was formed in the zeolite crystals. Finally, catalytic studies were carried out using ZSM-5, ZSM-12, MCM-22, their desilicated derivatives and a ZSM-12/MCM-41 composite material. Catalytic properties of the samples studied were affected to a large extent by the NaOH treatment.

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“…The first step in The reaction involves protonation of the doble bond giving pinanyl cation. The second involves a Wagner-Meerwein type rearragements of isoborrnyls and p-menthenyl cations giving camphene and others [11]. p in a n y l c a tio n Scheme 1.…”

Section: Isomerization Reactionmentioning

confidence: 99%

Isomerization of α-pinene in the terpentin oil with TCA/Natural Zeolite using microwave irradiation

Wijayati

Supartono

Kusumastuti

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Isomerization of α-pinene over dealuminated ferrierite-type zeolites

Cited by 108 publications

References 22 publications

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Ethylene production via catalytic dehydration of diluted bioethanol: A step towards an integrated biorefinery

Properties of Desilicated ZSM-5, ZSM-12, MCM-22 and ZSM-12/MCM-41 Derivatives in Isomerization of α-Pinene

Isomerization of α-pinene in the terpentin oil with TCA/Natural Zeolite using microwave irradiation

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