Alumina-promoted mesoporous sulfated zirconia: A catalyst for n-butane isomerization

Wang, Jung-Hui; Mou, Chung‐Yuan

doi:10.1016/j.apcata.2005.03.014

Cited by 45 publications

(64 citation statements)

References 26 publications

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“…For all samples, when Al is incorporated, the monoclinic phase tends to disappear due to stabilisation of the tetragonal phase, in agreement with literature results [20,24,30]. The powder XRD pattern of the calcined micelle-templated silica used to prepare the group (iii) materials was characteristic of mesoporous MCM-41 and exhibited four reflections in the 2h range of 2-8°, indexed for a hexagonal cell (see section 2.1.3).…”

Section: Characterisationsupporting

confidence: 83%

“…The mesoporous sulfated zirconia (MSZ) was prepared by following the procedure originally described by Ciesla et al [29] and later modified by Wang and Mou [30]. Hexadecyl trimethyl ammonium bromide (C 16 TMABr, 2.50 g, 6.86 mmol) was dissolved in deionized water (111 mL) and 37 wt.% HCl (18.8 mL).…”

Section: Synthesis Of Mesoporous Sulfated Zirconiasmentioning

confidence: 99%

“…However, mesoporous versions can be made using either triblock copolymers or surfactants as structure-directing agents [25][26][27][28][29][30][31]. Wang and Mou synthesized a mesoporous SZ using Zr(O)nPr) 4 as zirconium precursor, ammonium sulfate as sulfur source and hexadecyl trimethyl ammonium bromide as template [30].…”

Section: Introductionmentioning

confidence: 99%

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Modified versions of sulfated zirconia as catalysts for the conversion of xylose to furfural

et al. 2007

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Conventional (per)sulfated bulk zirconia, mesoporous sulfated zirconia and (per)sulfated zirconia supported on an ordered mesoporous silica, with or without aluminium incorporation, were examined as acid catalysts for the dehydrocyclisation of xylose into furfural. Furfural yields of up to 50% could be achieved at >90% conversion with the modified zirconia catalysts, which is better than that achievable with H 2 SO 4 (using approximately the same equivalent amount of sulfur.)

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Section: Characterisationsupporting

confidence: 83%

Section: Synthesis Of Mesoporous Sulfated Zirconiasmentioning

confidence: 99%

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Modified versions of sulfated zirconia as catalysts for the conversion of xylose to furfural

et al. 2007

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“…Recently, Hwang et al [6][7][8] reported that the addition of an optimal amount of alumina into the framework of SZ catalyst with various morphologies gave rise to more enhanced catalytic activities than the corresponding one without promoting. In their work, aluminum source was impregnated into as-prepared mesoporous zirconia by a post-treatment process.…”

Section: Somentioning

confidence: 98%

Simultaneous Al₂O₃ Doping and Sulfation in Hierarchically Porous ZrO₂ Solid Acids by an One‐pot Synthesis for Enhanced Recycling Catalytic Performances

Wang

Chen

et al. 2011

Chin. J. Chem.

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Alumina doping and sulfation in hierarchically porous zirconia solid acids have been achieved simultaneously via one-pot and bi-surfactant-assisted self-assembly process, using aluminum sulfate as both Al and 2 4 SO -sources.The prepared composite solid acids showed much enhanced acidity and recycling catalytic activity for an esterification reaction compared with sulfated zirconia without alumina doping and Al-doped sulfated zirconia without hierarchically porous structure.Keywords one-pot synthesis, doping, Al-promoted sulfated zirconia, hierarchical porous structure, material science, self-assembly IntroductionSince the discovery of the strong solid acidity, sulfated zirconia (SZ) has attracted much attention as a promising solid acid catalyst because of its great potential applications in industrial acid-catalyzed processes, such as the skeleton isomerization of alkanes 1,2 and esterification in biodiesel production.3 However, there are some critical problems of obtained SZ materials reported in literatures so far, such as poor stability in the presence of water because of the low crystallinity, quick loss of 2 4 SO-and tendency to undergo deactivation, which severely limit its practical applications.4,5 Conventional methods of synthesizing SZ usually lead to lower surface area than 100 m 2 •g -1 , which is also one main reason for its low catalytic activity. So it is still a great challenge to develop efficient synthetic protocols to prepare SZ materials with well-defined structural characteristics and highly preserved 2 4 SO-to meet the requirements of highly active and recyclable superstrong acidic solid catalysts for practical applications.In addition to sulfation, doping alumina into the framework of SZ to give stabilized and promoted activity is an alternative route to enhance the catalytic property of SZ. Recently, Hwang et al. [6][7][8] reported that the addition of an optimal amount of alumina into the framework of SZ catalyst with various morphologies gave rise to more enhanced catalytic activities than the corresponding one without promoting. In their work, aluminum source was impregnated into as-prepared mesoporous zirconia by a post-treatment process.A hierarchically porous material of multiple length scales has attracted much attention recently, because of its high surface area and regular porosity.9-15 However, most of the researches still focused on the synthesis and structure formation of the porous materials, 16,17 the catalytic property is still a hypothesis.Based on our recently developed synthetic strategy to prepare hierarchically porous zirconia with high thermal stability and high surface area, 9 we doped alumina and sulfate radical simultaneously into the framework of hierarchically porous zirconia by a simple one-pot process, where composite surfactants were employed as structural directing agents, and aluminum sulfate as both alumina and 2 4 SO -sources was added into the surfactant solution during the synthetic process for porous zirconia. Furthermore, the synthetic parameters, whi...

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“…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]. The effect of preparation conditions and calcination temperature on the structural phases, textural characteristics, number and types of active acidic sites on the surface of the sulfated zirconia were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM).…”

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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Alumina-promoted mesoporous sulfated zirconia: A catalyst for n-butane isomerization

Cited by 45 publications

References 26 publications

Modified versions of sulfated zirconia as catalysts for the conversion of xylose to furfural

Modified versions of sulfated zirconia as catalysts for the conversion of xylose to furfural

Simultaneous Al₂O₃ Doping and Sulfation in Hierarchically Porous ZrO₂ Solid Acids by an One‐pot Synthesis for Enhanced Recycling Catalytic Performances

Structural and Catalytic Properties of Sulphated Zirconia doped by Zn Oxide

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Alumina-promoted mesoporous sulfated zirconia: A catalyst for n-butane isomerization

Cited by 45 publications

References 26 publications

Modified versions of sulfated zirconia as catalysts for the conversion of xylose to furfural

Modified versions of sulfated zirconia as catalysts for the conversion of xylose to furfural

Simultaneous Al2O3 Doping and Sulfation in Hierarchically Porous ZrO2 Solid Acids by an One‐pot Synthesis for Enhanced Recycling Catalytic Performances

Structural and Catalytic Properties of Sulphated Zirconia doped by Zn Oxide

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Simultaneous Al₂O₃ Doping and Sulfation in Hierarchically Porous ZrO₂ Solid Acids by an One‐pot Synthesis for Enhanced Recycling Catalytic Performances