ChemInform Abstract: Mesoporous Zeolite Single Crystals.

Jacobsen, Claus J. H.; Madsen, Claus; Houžvička, J.; Schmidt, Iver; Carlsson, Anna

doi:10.1002/chin.200045255

Cited by 7 publications

(11 citation statements)

References 1 publication

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“…detail in section 3.1. Other solid templates include resins, 44 organic aerogels, 45,46 and polymers, 47,48 biological templates such as bacteria, 49 plants, 50,51 and starch, 52 as well as purely inorganic compounds such as Mg(OH) 2 53 and CaCO 3 . 53,54 The supramolecular templating method involves the use of surfactant molecules to actively direct the synthesis of large micropores or mesopores.…”

Section: Templating Methodsmentioning

confidence: 99%

Hierarchical zeolites: enhanced utilisation of microporous crystals in catalysis by advances in materials design

et al. 2008

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The introduction of synthetic zeolites has led to a paradigm shift in catalysis, separations, and adsorption processes, due to their unique properties such as crystallinity, high-surface area, acidity, ion-exchange capacity, and shape-selective character. However, the sole presence of micropores in these materials often imposes intracrystalline diffusion limitations, rendering low utilisation of the zeolite active volume in catalysed reactions. This critical review examines recent advances in the rapidly evolving area of zeolites with improved accessibility and molecular transport. Strategies to enhance catalyst effectiveness essentially comprise the synthesis of zeolites with wide pores and/or with short diffusion length. Available approaches are reviewed according to the principle, versatility, effectiveness, and degree of reality for practical implementation, establishing a firm link between the properties of the resulting materials and the catalytic function. We particularly dwell on the exciting field of hierarchical zeolites, which couple in a single material the catalytic power of micropores and the facilitated access and improved transport consequence of a complementary mesopore network. The carbon templating and desilication routes as examples of bottom-up and top-down methods, respectively, are reviewed in more detail to illustrate the benefits of hierarchical zeolites. Despite encircling the zeolite field, this review stimulates intuition into the design of related porous solids (116 references).

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Section: Templating Methodsmentioning

confidence: 99%

Hierarchical zeolites: enhanced utilisation of microporous crystals in catalysis by advances in materials design

et al. 2008

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“…131 Although nanosized zeolite crystal synthesis requires an incipient wetness impregnation of the material with an amount of zeolite synthesis gel lower than the total volume of the porosity to restrict the crystallization to the pore system, Jacobsen et al 20. 133, 135 reported that the use of a light excess of synthesis gel, with a sufficient concentration, led to the growth of large zeolite crystals that engulfed carbon black particles. It is essential that the nucleation of the zeolite takes place exclusively between the particles, which will not occur by simply dip‐coating into the synthesis gel.…”

Section: Constructive Synthesis Strategiesmentioning

confidence: 99%

“…By removal of the carbon matrix by controlled calcination, so‐called mesoporous zeolite single crystals (Figure 8), were obtained and exhibited a bimodal pore distribution, owing to the additional intracrystalline mesopore system with a broad pore size distribution in the range of 10–100 nm interconnected to the zeolite micropores. Since this discovery, this versatile method has been employed with a wide range of solid templates, such as carbon black,20, 133, 135–138 single‐ or multi‐walled carbon nanotubes,135, 139–141 carbon nanofibers,142, 143 carbon or polymer aerogel,144–146 ordered mesoporous carbon (CMK types),147, 148 non‐ordered mesoporous carbon,149 wood cells,150 and silica‐containing plants such as Equisetum arvense ,151, 152 or rattan stems 153. Recent reviews give a good overview of these methods 70.…”

Section: Constructive Synthesis Strategiesmentioning

confidence: 99%

Overview and Industrial Assessment of Synthesis Strategies towards Zeolites with Mesopores

et al. 2010

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International audienceWith the necessity for the refining industry to treat heavier feedstocks, there is a clear demand for improved zeolite materials displaying better accessible surface areas and higher pore volumes in order to capitalize on their effectiveness. To this end, over the last decade, there has been an intensification of research on the exploration of new routes to synthesize zeolite materials combining micropores with mesopores. Different synthesis strategies are used for their preparation (i.e., by structure breaking or so-called 'destructive' pathways, or structure building or so-called 'constructive' synthesis pathways). This Review discusses the variety of current synthesis strategies, while emphasizing the strengths and weaknesses of the different routes regarding material characteristics; health, safety, and environment aspects; and synthesis costs

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“…Recently, Tsapatsis and co-workers have successfully imprinted ordered mesoporous zeolite crystals by three-dimensionally ordered mesoporous (3DOM) carbons with pore size of 10-40 nm [102]. Of course, the solid template is not limited to carbon, and many solid materials such as CaCO 3 and MgO as well as biomaterials have been used to template mesoporous zeolites [108][109][110]. Notably, industrial applications of mesoporous zeolites templated from solid carbons are still limited because of the complexity of synthetic procedures and the hydrophobicity of the carbon templates.…”

Section: Templating Routesmentioning

confidence: 98%

Mesoporous Solid Acid Catalysts

2010

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Solid acids have been employed as one of the most important catalysts for chemical processes. However, relatively low surface area and small micropores of conventional solid acids have strongly limited their practical applications. This article systemically reviews the synthesis and catalysis performance of mesoporous solid acids including (1) mesoporous aluminosilicates, (2) mesoporous zeolites, (3) mesoporous sulfated zirconia, (4) mesoporous hybrid inorganic-organic materials, and (5) mesoporous resins.

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ChemInform Abstract: Mesoporous Zeolite Single Crystals.

Cited by 7 publications

References 1 publication

Hierarchical zeolites: enhanced utilisation of microporous crystals in catalysis by advances in materials design

Hierarchical zeolites: enhanced utilisation of microporous crystals in catalysis by advances in materials design

Overview and Industrial Assessment of Synthesis Strategies towards Zeolites with Mesopores

Mesoporous Solid Acid Catalysts

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