Aluminophosphate molecular sieves and the periodic table

Flanigen, Edith M.; Lok, Brent M.; Patton, R. L.; Wilson, Stephen T.

doi:10.1351/pac198658101351

Cited by 348 publications

(152 citation statements)

References 6 publications

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“…The insertion of transition metals in T-positions in the framework could enlarge their application possibilities to redox catalytic reactions such as NO x decomposition [17] or H 2 and methane combustion. The incorporation of transition metal atoms in the structure of SAPOs was first reported in 1986 [18,19] originating the MeAPSO materials, which are moreover characterized by a larger versatility in chemical structures with respect to zeolites. In order to open the possibilities of using the family CAL materials in redox-type catalytic reactions this work presents the synthesis and structural characterization of CHA-like analogous molecular sieves with framework transition metal ions (Mn, Co and Fe) using the same synthetic approach used for the other CAL materials.…”

Section: Introductionmentioning

confidence: 99%

[M]-CAL-2: MeAPSO-34-like molecular sieves using a lamellar aluminophosphate as precursor

Strauss

Martins

Berlier

et al. 2014

Microporous and Mesoporous Materials

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Section: Introductionmentioning

confidence: 99%

[M]-CAL-2: MeAPSO-34-like molecular sieves using a lamellar aluminophosphate as precursor

Strauss

Martins

Berlier

et al. 2014

Microporous and Mesoporous Materials

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“…Silicoaluminophosphates are an important class of adsorbents and catalytic materials generated by the introduction of silicon into its respective aluminophosphate phase framework [4][5][6]. This isomorphic substitution can occur by a replacement of one aluminum by one silicon (SM1), replacement of one phosphorous by one silicon (SM2), or replacement of aluminum-phosphorous pairs by two silicon (SM3).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and catalytic properties of SAPO-11 molecular sieve synthesized in hydrothermal media using di-isopropylamine as template

Chellappa¹,

Costa²,

Nascimento³

et al. 2014

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract.A microporous SAPO-11 Molecular sieve was successfully synthesized by the hydrothermal method, using a single agent, as an organic template: di-isopropylamine (DIPA). The obtained solid was calcined at 550• C for three hours, after which the flow of nitrogen was exchanged for that of synthetic air and submitted for another ten hours of calcination, so as to remove the single agent: di-isopropylamine, which after the removal of the template could be observed by the high crystallization of the sample. Furthermore, the molecular sieve was characterized by XRD, SEM, TG-DTG and N2 adsorption desorption (BET analysis). The obtained catalyst proved to have a high potential catalytic activity and selectivity, through the obtained characterization results, exhibiting good hydrothermal stability. The catalytic performance of SAPO-11 was tested by the deactivation/regenerability of the coked sample, furthered by cracking of n-hexane reaction and high olefins selectivity was obtained.

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“…[1][2][3][4][5][6][7][8][9][10][11] Zincoalumionophosphates, of which aluminum sites are partly substituted by zinc cation were also described by the same group. [3][4][5] Among them, zincoalumionophosphates with pores comprised of 12 T-atoms (so-called 12-ring pores as well as ''large-pores'') are expected to be useful for catalysis and/or adsorption on bulky organic chemicals with the size corresponding to their pore diameter.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] They were co-crystallized sometimes under similar synthetic conditions, and the crystal sizes obtained by hydrothermal conditions were as relatively large as 10-20 mm. However, the materials with small particle are favorable for purposes of catalyst and adsorbent uses.…”

Section: Introductionmentioning

confidence: 99%

Zincoaluminophosphate Molecular Sieves with AFI and ATS Topologies: Synthesis by Dry-Gel Conversion Methods and Their Catalytic Properties in the Isopropylation of Biphenyl

et al. 2005

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Zincoaluminophosphates, ZnAPO-5 and ZnAPO-36 with AFI and ATS topologies, were successfully synthesized by dry-gel conversion (DGC) method: vapor-phase transport (VPT) and steam-assisted conversion (SAC) methods. ZnAPO-5 was synthesized successfully at 175 C by VPT and SAC methods using Et 3 N as structure directing agent (SDA). ZnAPO-36 was also obtained by VPT and SAC methods using Pr 3 N as SDA. The heating protocol was a key factor for the crystallization in the synthesis of ZnAPO-36: the best result was obtained by heating at 140 C for 1 d after aging of the gel at 105 C for 2 d. Calcination procedure is important to get microporous molecular sieves. ZnAPO-5 by VPT method calcined at 550 C gave clear XRD with high microporosity. Highly microporous ZnAPO-36 by VPT method was obtained by careful calcination. Characterization of these zincoaluminophosphates was performed by XRD, NH 3 -TPD, TG, SEM, N 2 adsorption, and ICP analysis. ZnAPO-5 and ZnAPO-36 have the Brønsted acidic characters by the substitution of a part of aluminum with zinc.The isopropylation of biphenyl (BP) over these molecular sieves gave different level of the selectivities for 4,4 0 -DIPB: 60-75% for ZnAPO-5 and 35-45% for ZnAPO-36: these selectivities are in the similar level to corresponding magnesioaluminophosphates corresponding magnesioaluminophosphates. These differences of in the selectivity are due to the pore structure: ZnAPO-5 has onedimensional straight channel; however, ZnAPO-36 has one-dimensional channel with side pocket. The steric restriction by ZnAPO-5 effectively controls the transition state to differentiate the slim isomers from others; however, pores of ZnAPO-36 cannot differentiate effectively the isomers because of their side pockets.

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Aluminophosphate molecular sieves and the periodic table

Abstract: Abstract

Cited by 348 publications

References 6 publications

[M]-CAL-2: MeAPSO-34-like molecular sieves using a lamellar aluminophosphate as precursor

[M]-CAL-2: MeAPSO-34-like molecular sieves using a lamellar aluminophosphate as precursor

Synthesis, characterization and catalytic properties of SAPO-11 molecular sieve synthesized in hydrothermal media using di-isopropylamine as template

Zincoaluminophosphate Molecular Sieves with AFI and ATS Topologies: Synthesis by Dry-Gel Conversion Methods and Their Catalytic Properties in the Isopropylation of Biphenyl

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