Synthesis, characterization and catalytic applications of mesoporous γ-alumina from boehmite sol

Liu, Qian; Wang, Aiqin; Wang, Xuehai; Gao, Peng; Wang, Xiaodong; Zhang, Tao

doi:10.1016/j.micromeso.2007.08.007

Cited by 123 publications

(80 citation statements)

References 27 publications

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“…Liu et al [49] applied the same method of slow solvent evaporation of gels prepared with an alumina source and P123 as a template. However, in this case, the source of alumina consists of the main raw material in industry, boehmite, largely used for the preparation of alumina catalysts and supports.…”

Section: Ordered Mesoporous Aluminasmentioning

confidence: 99%

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

2018

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Synthetic zeolites are widely used as catalysts/carriers for many petrochemical reactions and in refining processes. These materials are usually synthesized in a powder form and must be shaped prior to use in industrial reactors. This review presents the state-of-the-art of the zeolite shaping technology describing the main modifications induced by the interactions between the zeolite and the binder. Additionally, a strategy is presented to overcome the diffusion limitations associated to the microporous structure of zeolites, consisting in the introduction of hierarchical porosity in the binder. Several developments in the field of hierarchical aluminas are summarized in this article, highlighting the possibility to design different ordered/disordered mesoporous and macroporous structures.

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Section: Ordered Mesoporous Aluminasmentioning

confidence: 99%

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

2018

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“…From these observations, it is concluded that even if the alumina crystallites are formed instantly during the addition of a basic reagent, i.e., NH 4 OH, addition of a modifying reagent such as EDAS just after the precipitation step can still interact strongly with the bulk alumina structure, but has almost no influence after longer agitation steps. This also confirms the importance of appropriate agitation steps during the formation of boehmite alumina hydroxide.…”

Section: Effect Of the Methods Of Preparation On Silica-alumina Samplesmentioning

confidence: 99%

“…[1][2][3] Among its many different crystallographic organizations, γ-Al 2 O 3 is the most interesting substrate, with a high specific surface area (up to 500 m 2 /g), good catalytic activity, strong sintering resistance, and some acidity properties. [4,5] Synthesis of alumina supports by sol-gel methods using organic or aqueous pathways has been the subject of numerous studies during the last decades. In organic methods, water is used as a reagent to hydrolyze an aluminium alkoxide precursor dissolved in an organic medium such as methanol, ethanol, and butanol.…”

Section: Introductionmentioning

confidence: 99%

“…Such methods have produced very good results [8,9] but are not convenient for industrialization scales because of the high reactivity between alkoxides and water, which requires a controlled atmosphere. An alternative involves aqueous methods, which consist of solubilizing aluminum salts [Al(NO 3 ) 3 , AlCl 3 , Al(SO 4 ) 2 ] in an aqueous medium followed by an increase of pH upon the addition of a basic medium such as NaOH, NH 4 OH, urea, or KOH to convert the aluminum ions into aluminum hydroxides. The following gel formation steps are similar to the organic method outlined previously.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Method of Aqueous Synthesis and the Nature of the Silicon Precursor on the Physicochemical Properties of Porous Alumina

Claude

Vilaseca²,

Tatton

et al. 2016

Eur J Inorg Chem

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Abstract:The aqueous sol-gel synthesis of γ-Al 2 O 3 modified with different silicon precursors {trimethoxysilane, triethoxysilane and N-[3-(trimethoxysilyl)propyl]ethylene diamine} has been investigated. Two parameters have been studied: the silicon addition step and the type of silicon alkoxide. A first observation was that adding a silicon alkoxide either before or just after the precipitation step influences both the crystallinity and structure, whereas adding the alkoxide after a long agitation time only slightly modifies the support properties. It was also highlighted that due to their higher reactivity, silicon precursors with methoxy groups interact more strongly with the bulk alumina than the silicon precursors with ethoxy groups. This differ-

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“…In this method pore structure was formed via supramolecular assembly process. Liu et al (49) synthesized mesoporous crystalline alumina by using boehmite sols in presence of non-ionic surfactant (P123). They have proposed the possibility of a different mechanistic pathway other than widely accepted supramolecular self-assembly process.…”

Section: Mechanism Of Formation Of Mesoporous Aluminamentioning

confidence: 99%

Synthesis,Mechanisms and Different Applications of Mesoporous Materials Based on Silica and Alumina

Gobara

2016

Egypt. J. Chem.

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ILICATE mesoporous materials have received widespread interest …..because of their potential applications. These novel materials, prepared either by soft-or hard-templating syntheses, become more and more important in many fields of science and technology such as adsorption, catalysis, separations, environmental processes, nanotechnology and biotechnology. According to IUPAC definition inorganic solids that contain pores with diameter in the size range of 2-50 nm are considered mesoporous materials, They also possess extremely high surface areas (>700 m 2 g −1) and narrow pore size distributions. This article review shows the current state of art and outlines the recent patents in mesoporous materials research in three general areas: synthesis, various mechanisms involved for porous structure formation and applications of mesoporous materials based on silica and alumina.

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Synthesis, characterization and catalytic applications of mesoporous γ-alumina from boehmite sol

Cited by 123 publications

References 27 publications

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

An Overview on Zeolite Shaping Technology and Solutions to Overcome Diffusion Limitations

Influence of the Method of Aqueous Synthesis and the Nature of the Silicon Precursor on the Physicochemical Properties of Porous Alumina

Synthesis,Mechanisms and Different Applications of Mesoporous Materials Based on Silica and Alumina

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