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

Martı́nez, Cristina; Corma, Avelino

doi:10.1016/j.ccr.2011.03.014

Cited by 612 publications

(409 citation statements)

References 262 publications

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“…27 Al MAS NMR spectra were recorded in a Bruker AV 400 spectrometer at 104.2 MHz with a spinning rate of 10 kHz and a 9° pulse length of 0.5 μs with a 1 s repetition time. 27 Al chemical shifts was referenced to Al 3+ (H 2 O) 6 . The chemical analyses were carried out in a Varian 715-ES ICP -Optical Emission Spectrometer, after solid dissolution in HNO 3 /HCl/HF aqueous solution.…”

Section: Characterization Of the Materialsmentioning

confidence: 99%

“…In addition to the molecular sieving, the presence of heteroatoms in different zeolitic structures may confer different properties to the zeolites, such as acidity, ion exchange, redox properties, among others. [3][4][5][6][7] Certain zeolites require organic molecules (organic structure-directing agent, OSDA) for their crystallization to be thermodynamically favorable, and several molecule groups have been studied. [8][9][10] Depending on the characteristics of these organic molecules (size, flexibility, and hydrophobicity), zeolites with different structural characteristics can be obtained.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Al-TON Zeolite Using a Dialkylimizadolium as Structure-Directing Agent

et al. 2016

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In this work, the synthesis of zeolites using 1-butyl-3-methylimidazolium chloride [C 4 MI]Cl as a structure-directing agent was investigated. The organic cation shows effectiveness and selectivity for the syntheses of TON zeolites under different reaction conditions compared to the traditional structuredirecting agent, 1,8-diaminooctane. The 1-butyl-3-methylimidazolium cation lead to highly crystalline materials and its role as OSDA in our synthesis conditions has been confirmed by characterization techniques. ICP-OES confirms the presence of Al in the samples and 27Al MAS NMR analysis indicated that aluminum atoms were incorporated in tetrahedral coordination. Scanning electron microscopy indicated that changing the crystallization condition (static or stirring), zeolites with different crystal size were obtained, which consequently affects the textural properties of the zeolites. Moreover, varying some synthesis parameters MFI zeolite can also be obtained.

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Section: Characterization Of the Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Al-TON Zeolite Using a Dialkylimizadolium as Structure-Directing Agent

et al. 2016

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“…6 There is an important motivation to understanding chemical reactions on zeolites, since they are the most used solid catalysts in the industry. [7][8][9] Among the many reactions they catalyze, perhaps the currently most important one is the catalytic cracking of crude oil in refineries around the globe. Other reactions include the conversion of alcohols into hydrocarbons and the selective catalytic reduction of NO x , to name a few.…”

mentioning

confidence: 99%

Exploring Zeolite Chemistry with the Tools of Surface Science: Challenges, Opportunities, and Limitations

Boscoboinik

Shaikhutdinov

2014

Catal Lett

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The complexity of catalysts that the surface science community has been able to address has increased substantially in a systematic manner, starting with metal and oxide single crystal surfaces and evolving to an atomistic description of clusters and nanoparticles on well-defined, planar supports. The next step in adding complexity is now to address surfaces of porous oxide materials, in particular of zeolites, which are the most extensively used catalysts in the industry. The recently reported successful fabrication of well-ordered thin films, consisting of planar arrangement of aluminosilicate polygonal prisms on a metal substrate counting with highly acidic bridging hydroxyl groups on the surface, represents the limiting case of infinitely large pore and cages in zeolites. This model system allows one to study reactions catalyzed by zeolites using the toolkit of surface science. In this Perspective, we describe the zeolitic model system, with its virtues and limitations, as well as the challenges, opportunities and expectations for the future in modelling porous catalysts by a surface science approach.

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“…To achieve the maximum yields of desired middle distillates, zeolites with low acidity should be used. Typical example of such material is dealuminated zeolite Y with high silica modulus [9,17]. Zeolites with a silica modulus higher than 20 provide the optimal acidity for hydrocracking.…”

Section: Resultsmentioning

confidence: 99%

NiMo/USY-Alumina Catalysts with Different Zeolite Content for Vacuum Gas Oil Hydrocracking Over Stacked Beds

Дик

Доронин

Gerasimov

et al. 2017

Proceedings of the Scientific-Practical Conference "Research and Development - 2016"

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The stacked beds comprising hydrotreating catalyst as the top layer, hydrocracking catalyst based on amorphous silica-alumina as the interlayer and hydrocracking catalyst based on USY zeolite as the bottom layer were tested in hydrocracking of mixed feed containing straight-run VGO, heavy coker gas oil, aromatic extract and petrolatum. It is shown that stacked beds with developed catalysts can be successfully used both in the once-through hydrocracking to provide VGO conversion of 70-80% with middle distillates yields up to 50 wt% and in the first stage operation of two stages hydrocracker to provide 35-65% VGO

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

Cited by 612 publications

References 262 publications

Synthesis and Characterization of Al-TON Zeolite Using a Dialkylimizadolium as Structure-Directing Agent

Synthesis and Characterization of Al-TON Zeolite Using a Dialkylimizadolium as Structure-Directing Agent

Exploring Zeolite Chemistry with the Tools of Surface Science: Challenges, Opportunities, and Limitations

NiMo/USY-Alumina Catalysts with Different Zeolite Content for Vacuum Gas Oil Hydrocracking Over Stacked Beds

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