Acidic Crystalline Aluminosilicates. New Superactive, Superselective Cracking Catalysts

Plank, C. J.; Rosinski, E.J.; Hawthorne, W. P.

doi:10.1021/i360011a001

Cited by 97 publications

(26 citation statements)

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“…The catalyst particles were first refluxed with 2% NH 4 NO 3 solution for 6 h, for three times, each time with a fresh 2% NH 4 NO 3 solution with subsequent calcining of the particles at 623 K in between. The catalyst particles thus obtained after a total of 18 h heating and containing about 5-6% of Na (determined by flame photometer) were boiled with a required percentage of cerium ammonium nitrate solution for about 16 h, thereby modifying the HX zeolite [17]. This was then dried and calcined at 623 K and ready for use in the reactor.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Alkylation of toluene with isopropyl alcohol catalyzed by Ce-exchanged NaX zeolite

Barman

Maity

Pradhan

2005

Chemical Engineering Journal

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Section: Catalyst Preparationmentioning

confidence: 99%

Alkylation of toluene with isopropyl alcohol catalyzed by Ce-exchanged NaX zeolite

Barman

Maity

Pradhan

2005

Chemical Engineering Journal

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“…[ 121 ] SAPO-34 with the CHA topology proves to be an effi cient catalyst in methanol-to-olefi ns (MTO) process, which provides a chance for producing basic petrochemicals from non-oil resources. For instance, the introduction of acid zeolite Y as a commercial fl uid catalytic cracking (FCC) catalyst brings out the revolution in oil refi ning.…”

Section: Acid-catalyzed Reactionsmentioning

confidence: 99%

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

Sun

2016

Advanced Energy Materials

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traditional hydrothermal syntheses would produce intermediate materials with 2D feature, such as MCM-22P, [ 7,8 ] PREFER, [ 9 ] which are composed of crystalline zeolite layers with the unit-cell thickness stacking on top of each other in ordered or disordered patterns. [10][11][12][13][14][15] Unlike traditional 3D zeolites, the crystal growth of frameworks in 2D layered zeolites is restricted in one particular direction, leaving lots of hydroxyl groups on layer surface. As zeolites are normally defi ned as 3D materials that possess regular micropore systems and consist of TO 4 tetrahedra, layered zeolite precursors containing silanols could not be regarded as zeolites in the strictest sense, but they are broadly included in the family of zeolite materials. Thus, the as-synthesized 2D zeolites are often denoted as layered zeolite precursors (the typical examples are shown in Table 1 ), [7][8][9] which would transform into their 3D order/disorder counterparts after removing organic molecules and condesation of interlayer silanols via calcination. [ 10 ] In the early research stage, the layered zeolite precursors are discovered accidentally in traditional hydrothermal syntheses, because we have limited control over the traditional synthesis process due to the incomplete understanding of crystallization mechanism. At that stage, one of the most attractive features of 2D zeolites is that they could transform into zeolite materials with hierarchical architectures. In some cases, the traditional synthesis produces hierarchical layered material, such as MCM-56, [ 26 ] in which the crystalline zeolite layers disorderly stacked. Furthermore, the recognition that the obtained layered precursors could be modifi ed into various hierarchical zeolite structures (such as delaminated, pillared, interlayer expanded and others) make them signifi cantly different from conventional 3D zeolite materials with rigid structures. Thus, the construction of hierarchical zeolite materials from the perspective of 2D layered zeolite precursors is an important research aspect during the past few years.With the improved synthetic techniques, layered zeolites are not only increasing in number, but also expanding the notion in composition and structure. One remarkable breakthrough in recent years is the discovery of 2D MFI nanosheets with the single unit-cell thickness (about 2 nm), which is achieved by adopting Gemini-type bifunctional surfactants as organic structure-directing agent (OSDA) in hydrothermal synthesis. [ 49 ] The calcined MFI nanosheets become a special kind of hierarchical zeolites Two-dimensional (2D) zeolites, originating from lamellar precursors, are a special kind of porous materials, in which crystalline zeolite nanolayers are weakly assembled in one particular direction. As there is no covalentbond between layers, the stacking sequences could be manipulated and possibly controlled to derive a family of zeolitic materials with structural diversity. The research on 2D zeolites arises from the primary casual discovery during ...

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“…The catalyst particles were first refluxed with 2% NH 4 NO 3 solution for 6 h, for three times, each time with a fresh 2% NH 4 NO 3 solution with subsequent calcining of the particles at 623 K in between. The catalyst particles thus obtained after a total of 18 h heating and containing about 5-6% of Na (determined by flame photometer) were boiled with a required percentage of cerium ammonium nitrate solution for about 16 h, thereby modifying the HX zeolite [31]. This was then dried and calcined at 623 K and ready for use in the reactor.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Kinetics of alkylation of phenol with methanol over Ce-exchanged NaX zeolite

2006

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The alkylation of phenol with methanol was investigated in vapor phase over a series of cerium-exchanged NaX zeolite with Ce loadings ranging from 0 to 10.43 wt%. The catalyst MX-4 with 8.86 wt% cerium was found to be the best one with total cresols selectivity of 72% at a temperature of 573 K and MeOH to phenol mole ratio of 4:1. The catalyst was also found to be quite stable in the operating range investigated. It was established that the stronger acid sties are required for C-alkylation compared to O-alkylation. From the study of the effects of various parameters, the optimum operating condition for highest cresols selectivity were determined as: MeOH to phenol mole ratio, 4:1; temperature, 623 K; space-time, 10.2 kg h/kgmole under atmospheric pressure. From the kinetic analysis of the experimental data, the apparent activation energy for the reaction was determined as 57.2 kJ/mole.

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Acidic Crystalline Aluminosilicates. New Superactive, Superselective Cracking Catalysts

Cited by 97 publications

References 0 publications

Alkylation of toluene with isopropyl alcohol catalyzed by Ce-exchanged NaX zeolite

Alkylation of toluene with isopropyl alcohol catalyzed by Ce-exchanged NaX zeolite

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

Kinetics of alkylation of phenol with methanol over Ce-exchanged NaX zeolite

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