Insight into the reaction mechanism of the conversion of methylbutynol on silica-alumina

Alsawalha, Murad; Roessner, F.

doi:10.1007/s11144-008-5249-y

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…The lowest conversion and product yields in case of diatomite were caused most likely by its low acidity (Yuan et al, 2004;Alsawalha et al, 2011) due to low polarization of Si-OH groups, which were calculated for the conversion of MBOH on silicaalumina and hydrotalcite, (AlSawalha and Roessner, 2008).…”

Section: Characterization Of Surface Acidity and Catalytic Ability Ofmentioning

confidence: 97%

“…Earlier it was proved by TPD-NH 3 that acidity of Jordanian alumosilicates decreases in row: zeolite > bentonite > red kaolinite > diatomite > white kaolinite (Alsawalha et al, 2011). However, sufficient amounts of basic products formed during MBOH conversion prove essential contribution of basic centers to the general concentration of surface centers, except for H-ZSM-5.…”

Section: Figmentioning

confidence: 97%

“…The MBOH conversion was used for testing of zeolites by Huang and Kaliaguine (1993), as well as by Meyer and Hoelderich (1999), hydrotalcite-derived metal oxides by Kustrowski et al (2004), whereas MgO by Chizallet et al (2006). However, there are very few applications of the test reaction of methyl butynol conversion for investigation of natural clays and clay minerals (Novikova et al, 2006;AlSawalha et al, 2011).…”

Section: Test Catalytic Reaction Of Methylbutynol Conversionmentioning

confidence: 99%

“…In case of Jordanian bentonite heating right up to 500 о С leads to the possibility of reversible hydration of the mineral (Sarikaya et al, 2000). It is supposed that water formed along the reaction causes clay swelling that makes for structural rearrangements of clays and makes internal acidic sites more accessible (AlSawalha et al, 2011). Calcination of kaolinite, a 1:1 clay mineral, results in its transformation to partially amorphous phase of metakaolinite, which acidity/basicity is varied by regimes of heating, providing material an ability to act as a super acid under certain condition (Macedo et al, 1994).…”

Section: Conversion Of Methylbutynol On Natural Alumosilicatesmentioning

confidence: 99%

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Characterization of surface acidity and catalytic ability of natural clay minerals by means of test catalytic reaction

Novikova¹,

Belchinskaya

Roessner

et al. 2013

Acta Geodynamica Et Geomaterialia

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Catalytic test reaction of methylbutynol (MBOH) conversion was applied to investigation of natural clays and non-clay minerals from Jordanian (bentonite, kaolinite, diatomite, zeolite) and Russian (palygorskite, kaolinite, hydromica) deposits as well as H-ZSM-5. Palygorskite and kaolinite containing samples have shown the highest catalytic activity. Conversion over Jordanian clay minerals decreased in the order: zeolite > bentonite > red kaolinite > white kaolinite > diatomite that agreed to change of acidity, surface area of samples. Sufficient deactivation was observed for H-ZSM-5, kaolinite and hydromica due to adsorption of secondary product in micropores of raw minerals. Products of both acidic and basic pathways of test reaction were formed indicating the presence of acid and basic sites on clays surface, apart from acidic catalyst H-ZSM-5. The yield ratio of acidic to basic products was above the unity for zeolite, bentonite, red kaolinite, and palygorskite; equal to unity for diatomite and hydromica, and less then unity for white kaolinite. It was observed for kaolinite containing sample that high activation temperature increased conversion of MBOH owing to formation of additional basic sites as a result of mineral dehydroxylation. Rise of montmorillonite content from 30 to 80 % provided 91-97 % of MBOH conversion.

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Section: Characterization Of Surface Acidity and Catalytic Ability Ofmentioning

confidence: 97%

Section: Figmentioning

confidence: 97%

Section: Test Catalytic Reaction Of Methylbutynol Conversionmentioning

confidence: 99%

Section: Conversion Of Methylbutynol On Natural Alumosilicatesmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of surface acidity and catalytic ability of natural clay minerals by means of test catalytic reaction

Novikova¹,

Belchinskaya

Roessner

et al. 2013

Acta Geodynamica Et Geomaterialia

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show abstract

“…The structure and morphology of natural Jordan diatomite were, investigated by scanning electron microscopy (SEM) [10] [10] and for the prediction of catalytically active sites, the conversion of methylbutynol was applied [11]. However, until present their characterization methods like X-ray fluorescence (XRF) are limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Treatment on Textural Properties of Natural Montmorillonite

Alsawalha¹

2018

Asian J. Chem.

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Synthesis and characterization of mesoporous and amorphous silica modified with silica-organo-sulfogroups

Kister

Roessner

2011

J Porous Mater

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Insight into the reaction mechanism of the conversion of methylbutynol on silica-alumina

Cited by 6 publications

References 8 publications

Characterization of surface acidity and catalytic ability of natural clay minerals by means of test catalytic reaction

Characterization of surface acidity and catalytic ability of natural clay minerals by means of test catalytic reaction

Effect of Thermal Treatment on Textural Properties of Natural Montmorillonite

Synthesis and characterization of mesoporous and amorphous silica modified with silica-organo-sulfogroups

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