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Biró, K.; Figuéras, F.; Álvarez, Carlos Márquez; Békássy, Sándor; Valyon, József

doi:10.1023/a:1010150617682

Cited by 19 publications

(11 citation statements)

References 15 publications

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“…3. The TG/DTG/DTA curves show characteristics similar to those reported by Figueras et al 10,60 The whole temperature range can be divided roughly into four parts: I. dehydration and dehydroxylation, II. decomposition of organic residue, III.…”

Section: Thermal Analysissupporting

confidence: 79%

“…On the basis of thermoanalytical experiments and according to earlier reports, 10,36 a calcination temperature of 650 uC was chosen. This temperature is particularly necessary in the case of metal ion promoted catalysts in order to guarantee the onset of catalytic activity.…”

Section: Activation and Nomenclaturementioning

confidence: 99%

“…Sulfated zirconia (SZ) based solid acid catalysts have been highlighted by many research groups as potentially viable substitutes for currently used liquid acids such as HF, H 2 SO 4 , and chlorinated alumina catalysts. [1][2][3][4][5][6][7][8][9][10] Initially, SZ was considered to be a superacid, i.e. exhibiting an acidity stronger than that of 100% sulfuric acid.…”

Section: Introductionmentioning

confidence: 99%

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Freeze-dried promoted and unpromoted sulfated zirconia and their catalytic potential

et al. 2001

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A new synthesis route for sulfated zirconia and iron, manganese, and iron-manganese promoted sulfated zirconia has been investigated. Zirconium hydroxide precursors were prepared from hydrogel and hydroalcogel; freeze-drying as well as oven-drying has been employed. The pure hydroxides, sulfated, and metal promoted sulfated zirconia were calcined at 650 uC and characterised by chemical analysis, XRD, TG/DTG/ DTA, nitrogen adsorption, SEM, FTIR pyridine adsorption, and ammonia TPD. The catalytic activity of the samples was screened in the double bond isomerisation of 1-butene and the benzoylation of anisole.Significant differences in the textural and acidic properties were found for samples prepared either by freezeor oven-drying. Virtually no difference in acidity was observed between sulfated and metal promoted sulfated zirconia.Freeze-drying, especially the hydro-alcogel synthesis, was found to be a powerful preparation method for promoted and unpromoted sulfated zirconia catalysts.

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Section: Thermal Analysissupporting

confidence: 79%

Section: Activation and Nomenclaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Freeze-dried promoted and unpromoted sulfated zirconia and their catalytic potential

et al. 2001

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“…Higher turn over of 82 per mol of sulphur for acetylation of anisole observed with sulfated zirconia than zeolites (2.6 per Al) is due to the (V) [18,19]. On the contrary, acetylation of toluene with sulfated zirconia shows the limited conversion with turn over of 20 per mol of sulphur and selectivity around 90% towards 4 MAP.…”

Section: Solid Acidsmentioning

confidence: 90%

Catalytic Acetylation of Aromatics with Metal Chlorides and Solid Acids − a Comparative Study

Wilson¹,

Kaliya

Landau

et al. 2017

Eurasian Chem. Tech. J.

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Evaluation of catalytic performances of selected metal chlorides such as AlCl 3 , SnCl 4 , ZnCl 2 , FeCl 3 , InCl 3 and GaCl 3 with solid acids such as sulfated zirconia, and zeolite beta was accomplished for acetylation of anisole, toluene and naphthalene. Presence of super acidity (Lewis or Bronsted acid) is found to be indispensable for activation of substrates towards acetylation reactions. In addition, presence of redox centers would further complement with the Lewis acid sites rendering catalytic stamina against deactivation. Strength of Lewis acid basically determines the activity of the metal chlorides towards acetylation. Among the Lewis acids investigated, FeCl 3 , InCl 3 and GaCl 3 exhibit their catalytic behaviour mostly through redox property as is evident from the conservation of Turn over number even after first cycle. Sulfated zirconia surpasses all the acid catalysts including metal chlorides and exhibits extended catalytic activity in acetylation of anisole. The pre-eminence of sulphated zirconia over other catalytic systems is owing to the synergistic effect of Lewis and Bronsted acidity.

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“…Several authors have made use of one-step methods in which incorporation of sulfur is achieved by addition prior to the gelation step [13,14]. Preparation through these sol-gel methods allows for better control of structural and textural properties, as well as sulfur content of the catalysts, through solvent selection [15] or hydrolysis method [16,17]. In a single-step sol-gel preparation, Ardizzone et al observed the formation of different sulfate species with varying pH during catalyst preparation, which corresponded to activity differences in the conversion of benzoic acid [18].…”

Section: Introductionmentioning

confidence: 99%

Pd-based sulfated zirconia prepared by a single step sol–gel procedure for lean NOx reduction

Holmgreen

Yung

Ozkan

2007

Journal of Molecular Catalysis A: Chemical

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Untitled

Cited by 19 publications

References 15 publications

Freeze-dried promoted and unpromoted sulfated zirconia and their catalytic potential

Freeze-dried promoted and unpromoted sulfated zirconia and their catalytic potential

Catalytic Acetylation of Aromatics with Metal Chlorides and Solid Acids − a Comparative Study

Pd-based sulfated zirconia prepared by a single step sol–gel procedure for lean NOx reduction

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