Various routes to methane utilization—SAPO-34 catalysis offers the best option

Vora, B.V.; Chen, John Qianjun; Bozzano, Andrea; Glover, Bryan; Barger, P.T.

doi:10.1016/j.cattod.2008.05.038

Cited by 75 publications

(42 citation statements)

References 39 publications

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“…The methanol-toolefins (MTO) reaction is an industrially viable route for making light olefins from nonpetroleum feedstocks, e.g., natural gas, coal and biomass [4], and is of economic value in times of high petroleum feedstock prices [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pore and Cage Size on the Formation of Aromatic Intermediates During the Methanol-to-Olefins Reaction

2015

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Six eight-membered-ring (8MR), microporous materials are synthesized and evaluated as catalysts for the methanol-to-olefins (MTO) reaction. The molecular sieves SSZ-13, SAPO-34, SAPO-39, MCM-35, ERS-7 and RUB-37 are investigated since they have 8MR access to the crystal interior but have differences in pore structure and cage size. The polymethylbenzene species that are the proposed reaction intermediates of the MTO reaction should only be able to form in materials with intra-molecular sieve void spaces of sufficient size to accommodate them. Thus, it is hypothesized that 8MR materials without adequately large pores or cages will be inactive for the MTO reaction. SSZ-13 and SAPO-34 (both with CHA framework topology) have interconnected 3-dimensional pore-and-cage systems sufficiently large for formation of the proposed reaction intermediates, while the other 8MR materials have intra-molecular sieve void spaces that are too small to allow formation of these species. The molecular sieves are tested as MTO catalysts at 400°C, and only the molecular sieves with the CHA topology show MTO activity. Post-reaction analysis of the organic content of each solid material is accomplished by HF acid digestion with subsequent 1 H NMR analysis of the extracted hydrocarbon products to confirm the presence of aromatics in the 8MR materials with sufficiently large cages (those with CHA topology), and absence with materials that have smaller void spaces. These data provide further support for the necessity of polymethylbenzene species in the hydrocarbon pool for MTO activity.

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Section: Introductionmentioning

confidence: 99%

Effect of Pore and Cage Size on the Formation of Aromatic Intermediates During the Methanol-to-Olefins Reaction

2015

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“…It is one of the most well investigated zeolite materials because of its various applications in chemical and petrochemical areas such as the CO 2 /CH 4 separation [3], heat thermo-chemical storage [4] and hydrogen purification [5], etc. Moreover, it is an excellent catalyst in the methanol-to-olefin (MTO) process [6]. As compared to zeolite ZSM-5, SAPO-34 displays the advantage of a higher selectivity toward light olefins.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of SAPO-34 Crystals with Different Morphologies by Microwave Heating

Song

Sharma

et al. 2010

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The crystal size and shape of the silicoaluminophosphate molecular sieve SAPO-34 have been effectively controlled in the reaction system of Al 2 O 3 -P 2 O 5 -SiO 2 -TEAOH-H 2 O under microwave radiations. Nano sheet-like SAPO-34 crystals are obtained when using colloidal silica as the silica source. When TEOS is used as the source of silica, homogeneous SAPO-34 crystals with a particle size of about 100 nm are formed, and the morphology of the crystals changes from uniform nano particles (*100 nm) to microspheres (*1.5 lm) by varying the H 2 O/Al 2 O 3 molar ratio. To further investigate the morphology control of SAPO-34, the synthetic factors, such as the silica source, water content, crystallization time and aging time have been studied in detail.

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“…On the other hand, the availability of huge quantities of methane has led to an increased interest in catalytic methanol-to-olefins (MTO) reaction, which is an alternative for the production of olefins. Zeolite ZSM-5 and silicoaluminophosphate SAPO-34 molecular sieves have been examined as potential catalysts for these reactions [1][2][3][4][5][6][7][8][9][10][11]. In comparison with ZSM-5, SAPO-34 shows a high selectivity toward light olefins, but it is rapidly deactivated by a coke deposition, which completely blocks the internal channels of the SAPO-34 crystals.…”

Section: Introductionmentioning

confidence: 99%

Light Olefins Synthesis from Methanol and Dimethylether over SAPO-34 Nanocrystals

et al. 2010

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The catalytic properties of SAPO-34 nanocrystals (crystal size: 75 nm) on methanol-to-olefins (MTO) and dimethylether-to-olefins (DTO) reactions were compared with those of SAPO-34 (crystal size: 800 nm). The SAPO-34 nanocrystals showed a longer catalyst lifetime in both the reactions than 800 nm-sized SAPO-34. The rate of catalyst deactivation of SAPO-34 was similar for both the MTO and DTO reactions indicating that the reaction of MeOH to DME and the diffusion of MeOH and DME into the SAPO-34 nanocrystals are fast and are not a rate limiting process. A possible reason for the long catalyst lifetime of the SAPO-34 nanocrystals is a short residence time in a crystal for the produced hydrocarbons because of a shorter diffusion length.

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Various routes to methane utilization—SAPO-34 catalysis offers the best option

Cited by 75 publications

References 39 publications

Effect of Pore and Cage Size on the Formation of Aromatic Intermediates During the Methanol-to-Olefins Reaction

Effect of Pore and Cage Size on the Formation of Aromatic Intermediates During the Methanol-to-Olefins Reaction

Fabrication of SAPO-34 Crystals with Different Morphologies by Microwave Heating

Light Olefins Synthesis from Methanol and Dimethylether over SAPO-34 Nanocrystals

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