Al-MCM-41 as methanol dehydration catalyst

Naik, Sajo P.; Bui, Vy; Ryu, Taegong; Miller, Jan D.; Zmierczak, W.

doi:10.1016/j.apcata.2010.04.007

Cited by 69 publications

(30 citation statements)

References 35 publications

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“…Pure silica mesoporous materials have relatively low acidity due to the chemically inert silicate framework so they are not effectual for doing catalytic chemical reactions. So as to improve acidity of mesoporous silica numerous studies have been performed to incorporate one or more heteroatoms like aluminum in the inert silica framework [12][13][14][15][16][17] . These functionalized materials are good heterogeneous catalysts for chemical reactions [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Dehydration of fructose and glucose to 5-hydroxymethylfurfural over Al-KCC-1 silica

Shahangi

Chermahini

Saraji

2018

Journal of Energy Chemistry

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Section: Introductionmentioning

confidence: 99%

Dehydration of fructose and glucose to 5-hydroxymethylfurfural over Al-KCC-1 silica

Shahangi

Chermahini

Saraji

2018

Journal of Energy Chemistry

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“…The weak catalytic abilities of SiO 2 and MCM‐41 are known and reported . To increase the catalytic activity in such materials an increase of their acidic properties is required.…”

Section: Resultsmentioning

confidence: 99%

“…To increase the catalytic activity in such materials an increase of their acidic properties is required. Concerning the MCM‐41 catalyst, Al 3+ ions are introduced into the material network to create Lewis type acidic sites . As an alternative way to increase the acidity of MCM‐41, as well as of SiO 2 , a sulfonic moiety can be tethered on the materials surface .…”

Section: Resultsmentioning

confidence: 99%

Kinetic parameter estimation for methanol dehydration to dimethyl ether over sulfonic and polymeric acid catalysts

Barbarossa

Viscardi

Nardo

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: The methanol dehydration to dimethyl ether (DME) has received considerable attention in the literature, because of its potential use as a multipurpose fuel. A wide literature of kinetic studies is available for γ-Al 2 O 3 , reference commercial catalyst but only a few authors report a kinetic analysis of attractive and alternative catalysts to γ-Al 2 O 3 in DME production. The aim of this work was to contribute in this direction, by performing a catalytic test focused on the determination of kinetic parameters for methanol dehydration over sulfonic acid catalysts and polymeric materials. RESULTS:The catalytic and kinetic behavior of these materials for the methanol to DME dehydration reaction has been investigated using a fixed bed reactor at total pressure of 1 bar within a temperature range of 50 to 450°C. The sulfonated fluoropolymer (Aquivion) exhibited the highest activity and stability for the dehydration reaction at relatively low temperatures at which the γ-Al 2 O 3 did not display any dehydration activity. The tested catalysts showed good time stability when both methanol and methanol/water mixtures were used as feed reactants. Good agreement was achieved between experimental data and the proposed model. CONCLUSION: The -SO 3 H groups enhanced the surface acidity and the catalytic performances. The sulfonated perfluorinated polymer (Aquivion) was able to catalyze the methanol/DME conversion at temperatures as low as 90°C. The selectivity to DME at lower temperatures was 100%. Apparent activation energy for this reaction was experimentally evaluated to 110 KJ/mol and theoretical calculated to 96 KJ/mol: there was a comparable and good agreement with the experimental data. Scheme 1. Structure of Aquivion (m = 1, 2 and n = 8, 8).www.soci.org V Barbarossa et al.wileyonlinelibrary.com/jctb

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“…It is illustrated in the literature that by the incorporation of some heteroatoms in the MCM‐41 structure, the obtained X‐MCM‐41 (where X includes cations as Al, Ga, Ti, or V) can yield much better catalytic performance against its pure metal‐free structure . As an example, the incorporation of aluminum as an abundant metal in the earth's crust is known as the most applied and industrially relevant method in the functionalization of amorphous silica .…”

Section: Introductionmentioning

confidence: 99%

An overall experimental analysis: Effects of synthetic parameters on the degree of order of mesochannels in nano‐sized Al‐MCM‐41

Roohollahi

Halladj

Ebrahimi

et al. 2018

Heteroatom Chemistry

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In an experimental and statistical study, the effects of five synthesis parameters on the degree of order of nano‐sized Al‐MCM‐41 were basically investigated. In a series of designed experiments, hydrothermal conditions (temperature and time), Si/Al, NaOH/Si, and cetyltrimethylammonium bromide/Si molar ratios were studied each at three levels. Degree of order of mesoporous channels was evaluated using small angle XRD. Nitrogen adsorption‐desorption technique, scanning and transmission electron microscopy (SEM‐TEM), and field‐emission SEM were also applied to detect the textural properties and the morphology of prepared nanoparticles. Energy‐dispersive X‐ray spectroscopy and mapping (EDS‐Map), inductively coupled plasma‐optical emission spectroscopy, and small angle X‐ray scattering were provided as complementary analyses. An accurate reduced quadratic equation was proposed as a function of effective terms in good agreement with the experimental results. Based on the analysis of variance, the amount of aluminum incorporated, sodium hydroxide, and the hydrothermal treatment duration was found to possess more dramatic effects on the degree of order than the other factors. The optimum conditions for the synthesis of a well‐ordered Al‐MCM‐41 were also obtained with the lowest template and the minimum hydrothermal duration verified by two validation tests.

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Al-MCM-41 as methanol dehydration catalyst

Cited by 69 publications

References 35 publications

Dehydration of fructose and glucose to 5-hydroxymethylfurfural over Al-KCC-1 silica

Dehydration of fructose and glucose to 5-hydroxymethylfurfural over Al-KCC-1 silica

Kinetic parameter estimation for methanol dehydration to dimethyl ether over sulfonic and polymeric acid catalysts

An overall experimental analysis: Effects of synthetic parameters on the degree of order of mesochannels in nano‐sized Al‐MCM‐41

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