Methanol conversion on SAPO-34 catalysts prepared by mixed template method

Lee, Yun-Jo; Baek, Suk Hwan; Jun, Ki‐Won

doi:10.1016/j.apcata.2007.06.034

Cited by 171 publications

(120 citation statements)

References 20 publications

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“…All SAPO-34 molecular sieves display a type I isotherm with hysteresis loops originating from the mesopores formed between the crystal particles [22]. S34-L-M-T has the largest surface area and the smallest micropore pore volume among the four prepared samples, while the BET surface areas for S34-L-M, S34-H-M and S34-V-M samples using Mor as SDA are somewhat smaller because of their larger pore, and the micropore pore volumes of the three samples are approximately the same and in accordance with previous report [13]. The average pore diameters of S34-H-M and S34-V-M samples are larger than that of the S34-L-M-T and S34-L-M samples because of the existence of more mesopores formed between their crystal particles.…”

Section: Nitrogen Adsorption-desorptionsupporting

confidence: 78%

“…Hydrothermal method, as the conventional strategy, has been applied in the preparation of SAPO-34 by numerous researchers [4][5][6][7][8][9][10][11][12][13][14][15]. However, separation between solvents and solid products is required by filtration or centrifugation, and partial organic SDAs are inevitably preserved in the liquid phase, resulting in the wastewater pollutants and downstream purification system installation [16].…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

Han

et al. 2014

Powder Technology

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a b s t r a c t a r t i c l e i n f oSAPO-34 molecular sieves were fabricated by a dry gel liquid-phase transport method using morpholine (Mor) or morpholine-tetraethylammonium hydroxide (Mor-TEAOH) as the structure-directing agent (SDA). The prepared samples were characterized by scanning electron microscope (SEM), nitrogen adsorption-desorption, X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH 3 -TPD), thermo-gravimetric analysis (TG) and Fourier transform infrared spectroscopy (FT-IR). The results indicated that the dry gel liquid-phase transport method is very effective to fabricate SAPO-34 molecular sieves with average crystal size about 0.6 μm using Mor-TEAOH as SDA and 3 μm using Mor as SDA, respectively. Moreover, the addition of TEAOH is beneficial to produce SAPO-34 with small crystal size. Methanol-to-olefins (MTO) reaction was chosen to test the catalytic performance of as-prepared SAPO-34 catalysts. The prepared SAPO-34 catalyst using Mor-TEAOH as SDA exhibited the excellent catalytic performance in MTO process owing to its small crystal size and high crystallinity. The conversion of methanol and selectivity of ethylene and propylene are up to 100% and 87.9%, respectively.

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Section: Nitrogen Adsorption-desorptionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

Han

et al. 2014

Powder Technology

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“…An increase in rate of diffusion can be achieved by preparing CHA type materials with smaller crystalline size. For doing that, a dry gel synthesis method 15 , the use of a combination of different SDA [16][17][18][19] , as well as the use of microwaves 20,21 has been applied to the synthesis of SAPO-34 with the objective of enhancing lifetime of the catalyst for the reaction of methanol to olefins. It has been found that a combination of TEAOH and morpholine in the synthesis results in a decrease of the size of the crystals with the corresponding increase in lifetime 17 .…”

Section: Introductionmentioning

confidence: 99%

“…For doing that, a dry gel synthesis method 15 , the use of a combination of different SDA [16][17][18][19] , as well as the use of microwaves 20,21 has been applied to the synthesis of SAPO-34 with the objective of enhancing lifetime of the catalyst for the reaction of methanol to olefins. It has been found that a combination of TEAOH and morpholine in the synthesis results in a decrease of the size of the crystals with the corresponding increase in lifetime 17 . Wang 18 also studied the combination of TEA and TEAOH with an improvement in lifetime, and very recently Alvaro-Muñoz et al 19 compared different SDA and remarked the importance that high external surface, smaller crystal size and high acidity have for the lifetime of SAPO-34.…”

Section: Introductionmentioning

confidence: 99%

Methanol to olefins: activity and stability of nanosized SAPO-34 molecular sieves and control of selectivity by silicon distribution

Martínez‐Triguero

Concepción

et al. 2013

Phys. Chem. Chem. Phys.

123

110

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Royal Society of ChemistryLi, Z.; Martínez Triguero, LJ.; Concepción Heydorn, P.; Yu, J.; Corma Canós, A. (2013 AbstractNanoSAPO-34 molecular sieve synthesized in microwave environment with 20nm of crystal size showed higher lifetime than SAPO-34 prepared by conventional hydrothermal method in the reaction of methanol to olefins. It has been found that silicon distribution strongly affects lifetime and selectivity. Thus, silicon at the border of the silicon islands gives higher lifetime and lower C2/C3 ratio. This change in activity and selectivity is better explained in terms of different silicon distribution than on preferential diffusion of ethene through the 8MR pores and agrees with transition-state selectivity. The effects of equilibrium of olefins and deactivation by coke were isolated,showing that after full formation of hydrocarbon pool, selectivity is independent of deactivation by coke.

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“…SAPO-34, as a kind of zeotype material, is a cage-type molecular sieve with framework structure similar to the naturally occurring chabazite zeolite (Lee et al 2007). Chabazite structure has a three-dimensional pore system with ellipsoidal cages interconnected via 8-membered ring windows with pore apertures of 0.38 nm 9 0.38 nm (Djieugoue et al 2000;Denayer et al 2008;Yan et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Study of carbon dioxide and methane equilibrium adsorption on silicoaluminophosphate-34 zeotype and T-type zeolite as adsorbent

Salmasi

Fatemi

Rad

et al. 2013

Int. J. Environ. Sci. Technol.

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Carbon dioxide is known as a hazardous material with acidic property that can be found as impurity in natural gas reservoirs with a broad range of 2 up to 40 %. Therefore, many efforts have been directed to remove and separate carbon dioxide from methane to prevent corrosion problems as well as improving the natural gas energy content. In this study, two molecular sieves, silicoaluminophosphate-34 (SAPO-34) zeotype and T-type zeolite, were synthesized by the hydrothermal method for the comparative study of adsorptive separation of carbon dioxide from methane. The synthesized adsorbents were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and Brunner-Emmett-Teller techniques. These characterization tests confirmed formation of both materials with acceptable crystallinity. Both adsorbents were tested in equilibrium adsorption experiments in order to evaluate maximum capacity and adsorption affinity. Adsorption capacity of carbon dioxide and methane on SAPO-34 and zeolite T were measured in a pressure range of 0.1-2.0 MPa and temperature of 288, 298, and 308 K and fitted with the Sips and Langmuir isotherm models. The ideal selectivity of CO 2 /CH 4 was determined for SAPO-34 and zeolite T at the studied pressures and temperatures, indicating that the molecular sieves can be properly used for CO 2 -CH 4 separation or CO 2 capturing from natural gas.

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Methanol conversion on SAPO-34 catalysts prepared by mixed template method

Cited by 171 publications

References 20 publications

Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

Facile synthesis of SAPO-34 with small crystal size for conversion of methanol to olefins

Methanol to olefins: activity and stability of nanosized SAPO-34 molecular sieves and control of selectivity by silicon distribution

Study of carbon dioxide and methane equilibrium adsorption on silicoaluminophosphate-34 zeotype and T-type zeolite as adsorbent

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