Studies of catalyst deactivation in methanol conversion with high, medium and small pore silicoaluminophosphates

Campelo, J.M.; Lafont, Fernando; Marinas, J. M.; Ojeda, Manuel

doi:10.1016/s0926-860x(99)00329-4

Cited by 79 publications

(44 citation statements)

References 42 publications

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“…6). These results indicate that formed carbon are mainly long-chain hydrocarbons on the Brönsted acid centers inside the pores of the zeolite, due to the deep dehydration of methanol and dimethyl ether [23,24].…”

Section: Methanol Dehydration Over Hy and Each Metal-modified Hymentioning

confidence: 84%

Synthesis of dimethyl ether (DME) on modified HY zeolite and modified HY zeolite-supported Cu–Mn–Zn catalysts

Fei

Hou

Zhu

et al. 2006

Applied Catalysis A: General

150

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Section: Methanol Dehydration Over Hy and Each Metal-modified Hymentioning

confidence: 84%

Synthesis of dimethyl ether (DME) on modified HY zeolite and modified HY zeolite-supported Cu–Mn–Zn catalysts

Fei

Hou

Zhu

et al. 2006

Applied Catalysis A: General

150

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“…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). Therefore, the fast mass transfer as well as the appropriate distribution and strength of the acid sites are required to avoid these serious problems.…”

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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“…Four samples gave peaks at approximately 210 and 380°C, which correspond to the weak and strong acid sites, respectively. The desorption peak at low temperature was attributed to the hydroxyl groups (-OH) bounded to the defect sites, i.e., POH, SiOH and AlOH (Campelo et al 2000;Dumitriu et al 1997). As shown in Fig.…”

Section: Catalytic Performancementioning

confidence: 94%

Green and efficient dry gel conversion synthesis of SAPO-34 catalyst with plate-like morphology

Wang

et al. 2016

Pet. Sci.

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SAPO-34 catalyst with plate-like morphology was designed and synthesized for the first time, by the dry gel conversion method using cheap triethylamine as a structure-directing agent assisted with seed suspension containing nanosheet-like SAPO-34 seed. The latter played an important role in formation of SAPO-34 (CHA-type) with plate-like morphology. In addition, the yield of the product in the synthesis system containing seed suspension reached 97%, 15% higher than that obtained in the corresponding synthesis system without the seed suspension. Meanwhile, the plate-like SAPO-34 catalysts synthesized by this method exhibited higher selectivity to light olefins and longer lifetime in methanol-to-olefins (MTO) reaction than the traditional cubic SAPO-34 catalyst. This work provides a new technical route for green and efficient synthesis of SAPO-34 catalysts with improved MTO performance.

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Studies of catalyst deactivation in methanol conversion with high, medium and small pore silicoaluminophosphates

Cited by 79 publications

References 42 publications

Synthesis of dimethyl ether (DME) on modified HY zeolite and modified HY zeolite-supported Cu–Mn–Zn catalysts

Synthesis of dimethyl ether (DME) on modified HY zeolite and modified HY zeolite-supported Cu–Mn–Zn catalysts

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

Green and efficient dry gel conversion synthesis of SAPO-34 catalyst with plate-like morphology

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