Modular Organic Structure-Directing Agents for the Synthesis of Zeolites

Simancas, Raquel; Dari, Djamal; Velamazán, Noemí; Navarro, Martí; Cantı́n, Ángel; Jordá, José L.; Sastre, Germán; Corma, Avelino; Rey, Fernando

doi:10.1126/science.1196240

Cited by 146 publications

(146 citation statements)

References 24 publications

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“…Increasing environmental concern and development of green processes based on heterogeneous catalysts are driving forces, not only for the improvement of conventional zeolites but also for discovering new molecular sieves with novel pore architectures ( [9][10][11]25,[32][33]. However, it is important to note that the well-established "big-five", i.e.…”

Section: Synthesis Of Inorganic Molecular Sievesmentioning

confidence: 99%

“…In the last years the application of HT experimentation has led to the discovery of many interesting zeolites: ITQ-32 [66], ITQ-33 [8], ITQ-37 [9], ITQ-40 [10], ITQ-44 [67] or ITQ-47 [11]. ITQ-32 is a bidirectional zeolite with 8R pores connected by 12R channels which can be prepared as a nearly pure silica zeolite and as aluminosilicate.…”

Section: Conventional Vs High-throughput Systems For Laboratory Zeolmentioning

confidence: 99%

“…Possible approaches are: to synthesize extra-large pore zeolites, [8][9][10][11][12], to decrease crystal size by direct synthesis [13][14][15][16][17][18][19] or by zeolite delamination [20], reducing in this way the length of the diffusion path. Another way of decreasing the length of the diffusion path is to generate mesopores in the zeolite crystals by means of carbon templating [21][22], by chemical or steam postsynthesis treatments [23] or by the use of supramolecular templating [24].…”

Section: Introductionmentioning

confidence: 99%

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Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes

Martı́nez

Corma

2011

Coordination Chemistry Reviews

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Section: Synthesis Of Inorganic Molecular Sievesmentioning

confidence: 99%

Section: Conventional Vs High-throughput Systems For Laboratory Zeolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes

Martı́nez

Corma

2011

Coordination Chemistry Reviews

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610

395

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“…[10][11][12][13] Recently, we have reported a number of new zeolites synthesized by using tetraalkylphosphonium cations (ITQ-26, 14 ITQ-27, 15 ITQ-34 16 and ITQ-49 17 ) or phosphazenes (ITQ-47 18 ) as OSDAs. The success of using phosphorous-containing cations as OSDA for zeolite crystallization has moved us to look for different alternatives of organophosphorous cations that are easy and safe to prepare.…”

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confidence: 99%

A New Microporous Zeolitic Silicoborate (ITQ-52) with Interconnected Small and Medium Pores

et al. 2014

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ABSTRACT:A new zeolite (named as ITQ-52) having large cavities and small and medium channels has been synthesized. This was achieved by using a new family of aminophosphonium cations as organic structure directing agent (OSDA). These cations contain P-C and P-N bonds, and therefore they lie between previously reported P-containing OSDA, such as tetraalkylphosphonium and phosphazenes. In this study, it has been found that 1,4-butane-diylbis[tris(dimethylamino)]phosphonium dication is a very efficient OSDA for crystallization of several zeolites, and in some particular conditions, the new zeolite ITQ-52 was synthesized as a pure phase. The structure of ITQ-52 has been solved using high resolution synchrotron X-Ray powder diffraction data of the calcined solid. This new zeolite crystallizes in the space group I2/m, with cell parameters a = 17.511 Å, b = 17.907 Å, c = 12.367 Å and β = 90.22 º. The topology of ITQ-52 can be described as a replication of a Composite Building Unit with ring notation [4 3 5 4 6 1 ] that gives rise to the formation of an interconnected 8R and 10R-channel system. Typically, zeolites can be described as crystalline silicabased microporous solids that can carry out a myriad of different processes when doped with the appropriated active sites, such as Al, B, Ga, Ge, Ti, Sn, etc. The catalytic performance of the final porous solids depends mainly on the nature of the heteroatom as well as on their structural pore topologies. Zeolites have been applied for gas adsorption, separation, catalysis, encapsulation or controlled release of molecules, among others, some of them are of industrial application. [1][2][3][4][5][6][7][8][9] There is no doubt that this is the driving force for synthesizing new zeolite structures.Most of the zeolites described in the literature have been obtained by employing tetraalkylammonium cations as organic structure directing agents (OSDAs). 10-13 Recently, we have reported a number of new zeolites synthesized by using tetraalkylphosphonium cations 14 15 and ITQ-49 17 ) or phosphazenes (ITQ-47 18 ) as OSDAs. The success of using phosphorous-containing cations as OSDA for zeolite crystallization has moved us to look for different alternatives of organophosphorous cations that are easy and safe to prepare. Then, we found in literature that Wittig-like cations can be quantitatively prepared from the commercially available aminophosphines resulting in phosphorous containing cations. [19][20][21][22] These new organocations are related to phosphazenes and tetraalkylphosphonium, since they contain P-N and P-C bonds (see fig. S1 in Supporting Information). On those bases, we have developed a new family of amino-phosphonium cations that introduce interesting features from the point of view of OSDAs for zeolite synthesis. Then, the amino-phosphonium cationic compounds have been used for zeolite synthesis, and here we describe the synthesis and crystal structure of a new zeolite, named as ITQ-52, that was obtained by using 1,4-butane-diylbis[tris(dimethylamino)]phosphonium di...

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“…Moreover, in some reactions, coke formation enhances these limitations, as the coke deposits block the zeolite micropores, which results in a rapid decrease in catalytic activity [6,7]. Therefore, several preparative strategies have been developed in the attempt to improve the performance of zeolites in catalysis: the synthesis of zeolites with extra-large pores [8][9][10][11], direct synthesis of zeolite nanocrystals [12][13][14][15][16][17], by exfoliating layered zeolites [18,19], and by introducing mesopores in the microporous materials through templating strategies [7, 20 -22] or demetallation processes [4,7,[23][24][25]. Recently, a novel synthesis procedure for the preparation of mesoporous MFI-type material based on the carbon templating method with an in-situ-generated carbon template was reported by our group [26].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous MEL, BEA, and FAU zeolite crystals obtained by in situ formation of carbon template over metal nanoparticles

et al. 2016

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Here, we report the synthesis and characterization of hierarchical zeolite materials with MEL, BEA and FAU structures. The synthesis is based on the carbon templating method with an in-situ-generated carbon template. Through the decomposition of methane and deposition of coke over nickel nanoparticles supported on silica, a carbon-silica composite is obtained and exploited as a combined carbon template/silica source for the zeolite synthesis. The mesoporous zeolite materials were all prepared by hydrothermal crystallization in alkaline media followed by removal of the carbon template by combustion, which results in zeolite single crystals with intracrystalline pore volumes of up to 0.44 cm 3 /g. The prepared zeolite structures are characterized by XRD, SEM, TEM and N2 physisorption measurements.

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Modular Organic Structure-Directing Agents for the Synthesis of Zeolites

Cited by 146 publications

References 24 publications

Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes

Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes

A New Microporous Zeolitic Silicoborate (ITQ-52) with Interconnected Small and Medium Pores

Mesoporous MEL, BEA, and FAU zeolite crystals obtained by in situ formation of carbon template over metal nanoparticles

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