Methanol conversion to light alkenes over SAPO-34 molecular sieves synthesized using various sources of silicon and aluminium

Popova, Margarita; Minchev, Christo; Kanazirev, V.

doi:10.1016/s0926-860x(98)00003-9

Cited by 77 publications

(23 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The BET surface area of sample with morpholine is 488 m 2 /g while that of sample with TEA is 560 m 2 /g. The results are similar to that of the sample that used TEAOH as the template reported in the literatures [19,20].…”

Section: Crystallinity and Size Distribution Of Spao-34 Crystalssupporting

confidence: 89%

Direct Synthesis of a Fluidizable SAPO-34 Catalyst for a Fluidized Dimethyl Ether-to-Olefins Process

et al. 2008

View full text Add to dashboard Cite

The dimethyl ether to olefins process is very important for converting coal to chemicals. A SAPO-34 molecular sieve with a particle size up to 50 lm has been synthesized with morpholine as the template. The cold model fluidization experiment indicates that the SAPO-34 catalyst with average size of 45-50 lm is of good fluidization properties. After high temperature steam treatment at 1073 K for 8 h, this large fluidizable catalyst showed good reactivity and selectivity for the dimethyl ether to olefins (DTO) reaction in a micro-reactor. X-ray diffraction characterization showed that the structure of the catalyst was maintained well. A fluidized reactor of 50 mm inner diameter was used to carry out the DTO reaction, which showed that the fluidizable SAPO-34 is a selective catalyst for light olefin production.

show abstract

Section: Crystallinity and Size Distribution Of Spao-34 Crystalssupporting

confidence: 89%

Direct Synthesis of a Fluidizable SAPO-34 Catalyst for a Fluidized Dimethyl Ether-to-Olefins Process

et al. 2008

View full text Add to dashboard Cite

show abstract

“…At 723 K, the decrease of light olefins selectivity with conversion is more pronounced and shows an almost linear decay from 90 % at conversion close to 100 to 85 % for a conversion level around 50 %. Furthermore, higher ethylene/propylene molar ratio is obtained (around 1.0-1.2) at 723 K. The raise in ethylene/propylene ratio with temperature has been previously attributed to the secondary reactions of oligomerization and cracking, which are favoured when the reaction temperature increases [17,63].…”

Section: Catalytic Activitymentioning

confidence: 74%

“…SAPO materials possess acid sites of medium strength and, therefore, they presented a very interesting alternative to obtain high selectivity towards light olefins in the MTO process. Most of the studies reported hitherto have been mainly focused on the SAPO-34 type material (isomorphous to chabazite), which allows for carrying out different modifications in its preparation and composition [17][18][19][20][21][22][23]. Zeolite-type smallpore microporous SAPO-34 has been proven an excellent catalyst for the MTO process, showing exceptionally high selectivity to lower olefins, with reported selectivities to C2-C4 olefins over 80 % [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mesopore-Modified SAPO-18 with Potential Use as Catalyst for the MTO Reaction

2015

View full text Add to dashboard Cite

SAPO-34 silicoaluminophosphates are well known as catalysts for the synthesis of light olefins-ethylene and propylene-from methanol by using the methanol to olefins (MTO) process, first described by Mobil. SAPO-18, which has a microporous framework structure related to but crystallographically distinct from SAPO-34, has been much less studied but promises to be a potential catalyst in the MTO process. The main drawback of these catalysts in this reaction is their rapid deactivation, due to the deposition of heavy carbonaceous products-coke-on the surface of the solid avoiding the access of methanol molecules to the active centres located inside the pores of the SAPO catalysts. We have used different mesoporogen agentsnanoparticulate carbons and chitosan-aiming to generate mesoporosity in the SAPO-18 crystals, in an attempt to improve the accessibility of the reagent to the active centres of SAPO-18 and, in that way, inhibit catalyst deactivation. All the materials prepared in this work present similar framework composition and silicon distribution and the main difference among them is the hierarchical porosity generated by the mesoporogen additives use in the synthesis, as determined by STEM. Using chitosan polymer as a secondary template results in an increase of the external surface, which improved significantly the internal diffusivity enhancing the life time of the catalyst in the MTO process.

show abstract

“…Among them, SAPO-34, with the CHA structure of 8-membered-rings, has received great attention in recent years because of its high selectivity to olefins in methanol-to-olefin (MTO) reaction. Many studies have examined the synthesis of SAPO-34, and its catalytic properties, deactivation and reaction mechanism in MTO reaction [1][2][3][4][5][6][7][8][9][10][11][12]. MTO process has also recently become more prominent as an approach to producing ethylene and propylene as an alternative naphtha cracking process, due to recent spikes in the crude oil price on the international market.…”

Section: Introductionmentioning

confidence: 99%

“…phosphoric acid (Samchun Chemicals, 85%) and fumed silica (Aldrich), respectively. The template used a mixture of TEAOH and DEA, as proposed in our previous study [4][5][6]. The gels prepared in this study were crystallized at 200 8C for 24 h. After crystallization, SAPO-34 samples of two phases were prepared for spray-drying.…”

Section: Introductionmentioning

confidence: 99%

Attrition resistance and catalytic performance of spray-dried SAPO-34 catalyst for MTO process: Effect of catalyst phase and acidic solution

Kim

Chae

Kim

et al. 2011

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

Methanol conversion to light alkenes over SAPO-34 molecular sieves synthesized using various sources of silicon and aluminium

Cited by 77 publications

References 30 publications

Direct Synthesis of a Fluidizable SAPO-34 Catalyst for a Fluidized Dimethyl Ether-to-Olefins Process

Direct Synthesis of a Fluidizable SAPO-34 Catalyst for a Fluidized Dimethyl Ether-to-Olefins Process

Mesopore-Modified SAPO-18 with Potential Use as Catalyst for the MTO Reaction

Attrition resistance and catalytic performance of spray-dried SAPO-34 catalyst for MTO process: Effect of catalyst phase and acidic solution

Contact Info

Product

Resources

About