Hydroisomerization and hydrocracking of linear and multibranched long model alkanes on hierarchical Pt/ZSM-22 zeolite

Martens, Johan A.; Verboekend, Danny; Thomas, Karine; Vanbutsele, Gina; Pérez‐Ramírez, Javier; Gilson, Jean‐Pierre

doi:10.1016/j.cattod.2013.03.041

Cited by 84 publications

(72 citation statements)

References 42 publications

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“…Hydroisomerization and hydrocracking of n-decane, n-nonadecane and pristane (2,6,10,14-tetramethylpentadecane) over a hierarchical Pt/ZSM-22 zeolite noted the contributions of both the acid sites located in the pore mouths and within the micropores to the skeletal rearrangement and cracking reactions. 317 Pd supported on a hierarchical Beta zeolite evaluated in both absence and presence of 4,6-dimethyldibenzothiophene showed a better sulphur tolerance than a Pd/Al-MCM-41 catalyst in hydrogenation of naphthalene and pyrene. 318 Likewise, hierarchical Ni/Beta zeolites have been studied in the hydroreforming of the oil obtained from the thermal cracking of low-density polyethylene, showing to be an adequate catalyst for obtaining gasoline and diesel fractions that could be employed in the formulation of transportation fuels.…”

Section: Industrial Processesmentioning

confidence: 98%

From 3D to 2D zeolite catalytic materials

et al. 2018

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Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

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Section: Industrial Processesmentioning

confidence: 98%

From 3D to 2D zeolite catalytic materials

et al. 2018

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“…Zeolites are found for more industrial applications by virtue of their properties such as acidity, hydrothermal stability, shape selectivity, and the flexibility in tailormaking of catalyst for catalytic cracking (Rownaghi et al 2012), hydrocracking (Martens et al 2013), methanol-to-gasoline (MTG) (Rownaghi and Hedlund 2011), and methanol-to-dimethyl ether (MTD) , etc. However, the limited diffusion of the molecules within the zeolites crystals and the nonuniform distribution of acidic strength result in coke deposition, low product selectivity, and short catalyst lifetime (Campelo et al 2000;Fei et al 2006).…”

Section: Introductionmentioning

confidence: 99%

HZSM-5/MCM-41 composite molecular sieves for the catalytic cracking of endothermic hydrocarbon fuels: nano-ZSM-5 zeolites as the source

Sang

Jiao

et al. 2014

J Nanopart Res

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A series of HZSM-5/MCM-41 composite molecular sieves (HZM-Ns (x)) were prepared by employing nano-ZSM-5 zeolites with the SiO 2 /Al 2 O 3 ratios (x) of 50, 100 and 150 as the source. These materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy, N 2 adsorptiondesorption measurement, and NH 3 temperature-programmed desorption. The catalytic cracking of endothermic hydrocarbon fuels over the HZM-Ns with ndecane as model was evaluated at atmospheric pressure and 500°C. The effect of the parent zeolite, mesopore and SiO 2 /Al 2 O 3 ratio on the structure, acidity, and catalytic performance of HZM-Ns was investigated. The HZM-Ns exhibited a skeletal matrix with nano-sized HZSM-5 particles (200-300 nm) with a controllable acidity well dispersed in and microporous-mesoporous hierarchical pores. The mesoporous structure improved the diffusion of the reactants and products in the pores, and the HZSM-5 nanoparticles uniformly dispersed in the MCM-41 matrix supplied a proper acidity, shorter channels, and a higher specific surface area for reaction. These resulted in a high catalytic activity, a high selectivity to light olefins and a long lifetime for n-decane catalytic cracking. The HZM-N (150) exhibited the excellent conversion, a high selectivity to light olefins and a long lifetime due to low diffusion resistance, high specific surface area, and appropriate acid distribution and strength, with the increasing SiO 2 / Al 2 O 3 ratio.

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“…4,5 Well-known examples include the catalytic cracking of oil feedstock, dewaxing of petroleum products and methanol-to-hydrocarbon conversion. [6][7][8] To study shape selectivity, knowledge about the effective pore diameter of a microporous material is of paramount importance. Methods have been developed to determine the accessibility of (modified) zeolites and other microporous materials based on the reactivity of probe molecules in test reactions.…”

Section: Introductionmentioning

confidence: 99%

Zeolite molecular accessibility and host–guest interactions studied by adsorption of organic probes of tunable size

Hendriks

Valencia

Bruijnincx

et al. 2017

Phys. Chem. Chem. Phys.

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A series of fluorescent probe molecules based on the commercially available trans-4-(4-(diethylamino)styryl)-N-methylpyridinium iodide (DAMPI) scaffold has been developed. The dynamic radii of these DAMPI-type probes covered a range of 5.8 to 10.1 Å and could be changed by varying the alkyl substituents on the amine donor group, with limited effect on the electronic properties. These probe molecules allow for the direct evaluation of the molecular accessibility into confined spaces, more specifically the micropore architecture of zeolite materials. Evaluation of industrially relevant zeolite materials with 8- (CHA), 10- (MFI) and 12-membered ring pores (FAU) showed that steric bulk influences the rate of adsorption, the amount of probe molecule taken up by the zeolite as well as the interaction of the probe molecule with the zeolite material. Furthermore, a positive linear correlation is found between the pore-probe size difference and total probe uptake by the zeolite. The absorption spectra of each probe molecule within the zeolites show that this DAMPI-type compound is chemically bound to the zeolite's acid sites. The new approach shows the general principle of determining size-accessibility relationships in microporous solids with a series of fluorescent probes of systematically tunable size.

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Hydroisomerization and hydrocracking of linear and multibranched long model alkanes on hierarchical Pt/ZSM-22 zeolite

Cited by 84 publications

References 42 publications

From 3D to 2D zeolite catalytic materials

From 3D to 2D zeolite catalytic materials

HZSM-5/MCM-41 composite molecular sieves for the catalytic cracking of endothermic hydrocarbon fuels: nano-ZSM-5 zeolites as the source

Zeolite molecular accessibility and host–guest interactions studied by adsorption of organic probes of tunable size

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