Acid strength of solids probed by catalytic isobutane conversion

Fraenkel, Dan; Jentzsch, Nicholas R.; Starr, Christopher Allen; Nikrad, P. V.

doi:10.1016/j.jcat.2010.06.002

Cited by 25 publications

(15 citation statements)

References 46 publications

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“…A similar value (0.5 %) of isobutane conversion was used by Hall [10] and Fraenkel [19] for acid strength measurements.…”

Section: H O Min Measurementsmentioning

confidence: 94%

“…The application of different methods such as TPD [36], ammonia adsorption measurements [37] as well as the use of isobutane as a test reactant [19] to one solid acid i.e. ZrO 2 /SO 4 2-allow to state that the acid strength is in the range of -19 \ H O \ -18 while the results obtained using NMR technique [38,39], indicate that the acid strength was considerably lower than that of sulfuric acid (H O = -12).…”

Section: Other Methods For Acid Strength Determinationmentioning

confidence: 99%

“…A similar method based on 13 CNMR measurements of mesitil oxide molecule interaction with acids allowed Haw et al [18] to compare the acid strength of zeolites with that of mineral acids and superacids. The Hall correlation [10] has been also used by Fraenkel et al [19] to link acid strength of acid catalysts with the results of isobutane isomerization at strictly defined condition. For this reaction, the following formula for acid strength was developed:…”

Section: Indirect H O Measurementsmentioning

confidence: 99%

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Styrene and styrene dimer derivatives, cyclohexene, tert-butylbenzene and cumene as test reactions for acid strength measurements of crystalline and amorphous silica-aluminas, sulfated oxides and Amberlyst

Marczewski

Marczewska

Popielarska

et al. 2015

Reac Kinet Mech Cat

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The minimal H O values required for cyclohexene, a-methylstyrene, styrene, 2,4-diphenyl-4-methyl-1-pentene, 4-phenyl-1-butene, tert-butylbenzene and cumene to undergo the chosen test reactions over solid acids at 303 K have been established. The chosen reactions and the respective H O min values obtained are as follows: a-methylstyrene and styrene oligomerization (-3.3 and -5.3), 2,4-diphenyl-4-methyl-1-pentene and 4-phenyl-1-butene oligomerization and isomerization (-6.9 and -7.9), cyclohexene oligomerization (-7.8), tert-butylbenzene disproportionation (-10.8) and cumene disproportionation (-11.5). The above mentioned test reactions were used to study the acid strength of different solid acids.

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“…A similar value (0.5 %) of isobutane conversion was used by Hall [10] and Fraenkel [19] for acid strength measurements.…”

Section: H O Min Measurementsmentioning

confidence: 94%

Section: Other Methods For Acid Strength Determinationmentioning

confidence: 99%

Section: Indirect H O Measurementsmentioning

confidence: 99%

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Styrene and styrene dimer derivatives, cyclohexene, tert-butylbenzene and cumene as test reactions for acid strength measurements of crystalline and amorphous silica-aluminas, sulfated oxides and Amberlyst

Marczewski

Marczewska

Popielarska

et al. 2015

Reac Kinet Mech Cat

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“…Special attention has been given to the preparation, characterization, and catalytic investigation of SZ which possesses more acid sites than other sulfated metal oxides, so SZ is considered super acidic according to acidity measurements, alkane transformation and isobutene conversion [17].…”

mentioning

confidence: 99%

“…Based on the Hammett indicator test, SZ is reported to exhibit super acidity with H o < -16 [17][18][19]. The catalytic and structural properties of the SZ depend on a number of factors including preparation methods, precursor used, precursor concentration, pH, sulfonating agent and calcination temperature [20].…”

mentioning

confidence: 99%

Structural and Catalytic Properties of Sulphated Zirconia doped by Zn Oxide

2017

Egypt. J. Chem.

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ULFATED zirconia (SZ) and zinc supported sulfated ……zirconia (Zn/SZ) catalysts were synthesized, characterized and evaluated by coumarin synthesis reaction. The reaction was carried by reacting resorcinol and ethyl acetoacetate with a molar ratio 1:2 respectively. The investigated SZ and Zn/SZ catalysts were prepared by the simple impregnation method with an aqueous solution of H 2 SO 4 as a precipitating agent, followed by drying in rotary and finally calcined at 600 o C for 3 hrs. The physicochemical properties of the investigated catalysts were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and potentiometric titration to characterize the number and the strength of the acid sites. The 6%Zn/SZ catalyst possessed the maximum catalytic activity as well the number of acid sites. Increase of the tetragonal phase content in ZrO 2 increases the catalytic activity.

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Isomerization

2017

Hydrocarbon Chemistry, Two Volume Set

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Acid strength of solids probed by catalytic isobutane conversion

Cited by 25 publications

References 46 publications

Styrene and styrene dimer derivatives, cyclohexene, tert-butylbenzene and cumene as test reactions for acid strength measurements of crystalline and amorphous silica-aluminas, sulfated oxides and Amberlyst

Styrene and styrene dimer derivatives, cyclohexene, tert-butylbenzene and cumene as test reactions for acid strength measurements of crystalline and amorphous silica-aluminas, sulfated oxides and Amberlyst

Structural and Catalytic Properties of Sulphated Zirconia doped by Zn Oxide

Isomerization

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