Octane-Enhancing, Zeolitic FCC Catalysts: Scientific and Technical Aspects

Scherzer, Julius

doi:10.1080/01614948909349934

Cited by 232 publications

(153 citation statements)

References 128 publications

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“…Especially in former times, when MAS NMR spectrometers were not yet generally available, utilization of Eq. 4.59 proved to be, in combination with wet chemical analysis of the bulk, an essential method to differentiate between framework and extra-framework aluminum in faujasite-type zeolites, first of all in ultrastabilized varieties used as cracking catalysts [459].…”

Section: Determination Of Framework Aluminum From X-ray Datamentioning

confidence: 99%

Characterization of Zeolites — Infrared and Nuclear Magnetic Resonance Spectroscopy and X-Ray Diffraction

Karge¹,

Hunger²,

Beyer³

1999

Catalysis and Zeolites

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Section: Determination Of Framework Aluminum From X-ray Datamentioning

confidence: 99%

Characterization of Zeolites — Infrared and Nuclear Magnetic Resonance Spectroscopy and X-Ray Diffraction

Karge¹,

Hunger²,

Beyer³

1999

Catalysis and Zeolites

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“…These features significantly deteriorate the mass and heat transfer in the FCC catalyst. Hence, in modern FCC catalysts, peptized boehmite/pseudoboehmite is usually utilized as the catalyst binder together with the aluminum sol [1][2][3]. In fact, the peptized pseudoboehmite usually has a highly porous structure, which provides the pores for the diffusion of hydrocarbons, facilitates the heat transfer in the catalyst particles and traps the pollutants, such as metals and coke [1].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of different fluorine-containing compounds in the preparation of novel alumina binders with rich Brönsted acid sites

et al. 2014

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Alumina is commonly used as a catalyst binder together with aluminum sol in modern fluid catalytic cracking (FCC) catalysts. The surface acidity properties of alumina strongly affect the catalytic performance of FCC catalysts. Lewis acid sites tend to produce coke because of their dehydrogenation activity, while Brönsted ones produce less coke. Thus, it is beneficial to convert the surface Lewis acid sites into Brönsted type. Fluorine-containing modifiers have been demonstrated to be effective to generate Brönsted acid sites on alumina surface. However, different types of fluorine-containing compounds may have different modification effects. In this work, three fluorinecontaining compounds, ammonium fluoroborate (NH 4 BF 4 ), ammonium fluorosilicate [(NH 4 ) 2 SiF 6 ], and ammonium fluoride (NH 4 F), were tested and compared in the modification of alumina surface acidity. Results show that NH 4 BF 4 and (NH 4 ) 2 SiF 6 perform equally well in the generation of Brönsted acid sites, while NH 4 BF 4 is more effective in the reduction of Lewis acid sites. In comparison, NH 4 F is not so effective in the generation of Brönsted acid sites as the other two compounds.

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“…Progress in this area has already been observed in the field of catalysis. [7][8][9][10][11] An important example of reaction dynamics in restricted geometries is that of photoinduced electron transfer. Ions formed by electron transfer from a photoexcited donor molecule experience a thermodynamic driving force that tends to cause them to recombine, with no net chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Role of Diffusion in Photoinduced Electron Transfer on a Micelle Surface: Theoretical and Monte Carlo Investigations

Weidemaier

Fayer

1996

J. Phys. Chem.

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A detailed theoretical treatment of donor-acceptor photoinduced forward electron transfer and back transfer (geminate recombination) for molecules diffusing on a micelle surface is presented. Expressions are given for the time-dependent survival probabilities of both the excited-state donor and the charge-transfer state formed by forward electron transfer. Incorporation of diffusion has a pronounced effect on the kinetics of both the forward and the back transfer, and the amount of geminate recombination depends critically on the Coulombic potential between the ions. Ion spatial distributions as a function of time are presented and used to discuss the possibility of achieving long-term ion separation. The validity of the theory is demonstrated by comparison to Monte Carlo simulations of the problem, and the perfect agreement obtained confirms the accuracy of the theoretical derivation.

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Octane-Enhancing, Zeolitic FCC Catalysts: Scientific and Technical Aspects

Cited by 232 publications

References 128 publications

Characterization of Zeolites — Infrared and Nuclear Magnetic Resonance Spectroscopy and X-Ray Diffraction

Characterization of Zeolites — Infrared and Nuclear Magnetic Resonance Spectroscopy and X-Ray Diffraction

A comparative study of different fluorine-containing compounds in the preparation of novel alumina binders with rich Brönsted acid sites

Role of Diffusion in Photoinduced Electron Transfer on a Micelle Surface: Theoretical and Monte Carlo Investigations

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