Steaming and washing effect of P/HZSM-5 in catalytic cracking of naphtha

Liú, Dan; Choi, Won‐Mook; Lee, Chul Wee; Kang, Noeul; Lee, You Jin; Shin, Chae‐Ho; Park, Yong Ki

doi:10.1016/j.cattod.2010.10.091

Cited by 62 publications

(65 citation statements)

References 14 publications

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“…Three primary strategies for achieving these properties include element modification (Liu et al 2011;Wakui et al 2002), preparation of nano-zeolites (Song et al 2004;Morales-Pacheco et al 2007;Viswanadham et al 2009;Mochizuki et al 2011), and introduction of mesopores between zeolites crystals (Zheng et al 2009;Tang et al 2012;Groen et al 2004). Element modification of zeolites, such as non-metal, alkali metal, alkaline earth metal, transition metal, and rare earth metal modification can adjust acidity and product selectivity, improve catalytic activity (Xue et al 2007;Wang et al 1994Wang et al , 2007Maia et al 2010).…”

Section: Introductionmentioning

confidence: 94%

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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Section: Introductionmentioning

confidence: 94%

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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“…These transformations are observed by solid state 29 Al MAS NMR in 1D or 2D [20]. When the degree of distortion is low, modifications could be restored by washing with hot water [17,21,22]. Besides the removal of FAl IV , H 3 PO 4 neutralizes Brönsted acidic sites with POH groups, particularly the strongest acid sites [23].…”

Section: Introductionmentioning

confidence: 97%

Controlling coke deactivation and cracking selectivity of MFI zeolite by H3PO4 or KOH modification

Epelde

Santos

Florian

et al. 2015

Applied Catalysis A: General

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2 -Graphical abstract Highlights -3 --Effect of ZSM-5 zeolite treatment with H3PO4 or KOH on its acidity and structure -Catalytic features linked with 1-butene oligomerization-cracking into propylene -Diffusion length of precursors controls catalytic deactivation by coke -Acid strength controls propylene selectivity and 1-butene conversion Abstract The effect of the basic (KOH) or acid (H 3 PO 4 ) treatment of the MFI (HZSM-5) zeolite has been studied comparing the structural and acidic features with the catalytic performance and deactivation of a set of unmodified and modified zeolites (SiO 2 /Al 2 O 3 = 30-280, 0-3 wt% of K or P). The properties of the catalysts have been elucidated using XRD, 27 Al and 29 Si NMR, N 2 adsorption-desorption, and adsorption-TPD of tertbutylamine. The catalytic performance has been evaluated in the cracking of 1-butene by means of initial, 5 h on-stream activity and coke formation. Our results point to the fact that using zeolites with high SiO 2 /Al 2 O 3 ratio or neutralizing the strongest acid sites with KOH or H 3 PO 4 increases propylene selectivity while decreases 1-butene conversion. The overall pathway of reaction involve propylene and other olefins as primary products that condensate in further steps to aromatics and ultimately to coke.This pathway can be controlled with less severe acidic features and by desilication with KOH or H 3 PO 4 (particularly with the former).

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“…The modification of HZSM-5 zeolites with rare earth elements [2,7,8,12] and phosphorus [13,14] has been resulted in improving the yields of light olefins in CC of alkanes. For instance, an overall ethylene plus propylene yield of 48 wt.…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of catalytic cracking of C4 alkanes over La/HZSM-5 catalysts in light olefin production

Rahimi

Karimzadeh

2015

Journal of Analytical and Applied Pyrolysis

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Steaming and washing effect of P/HZSM-5 in catalytic cracking of naphtha

Cited by 62 publications

References 14 publications

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

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

Controlling coke deactivation and cracking selectivity of MFI zeolite by H3PO4 or KOH modification

Kinetic modeling of catalytic cracking of C4 alkanes over La/HZSM-5 catalysts in light olefin production

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