Silicoaluminophosphate molecular sieves SAPO-11, SAPO-31 and SAPO-41: synthesis, characterization and alkylation of toluene with methanol

Prakash, Anand; Satyanarayana, C.V.V.; Bagwe, Rahul P.; Ashtekar, Sunil; Chakrabarty, D. K.

doi:10.1016/0927-6513(95)00091-7

Cited by 54 publications

(28 citation statements)

References 22 publications

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“…The synthesis procedures, chosen according to the literature reports on SAPO-31 [2,[4][5][6][7] and MeAPO-31 [8,[14][15][16], were systematically studied and optimized. Final molar compositions of the reaction mixtures and the synthesis conditions for the preparation of pure AlPO 4 -31 and Me-APO-31 (Me ¼ Co, Mn) phases are given in Table 1.…”

Section: Synthesismentioning

confidence: 99%

“…Phosphorus substitution was later confirmed using several characterization methods [4][5][6][7] and was supported by several catalytic reactions such as hydrocarbon transformations [8][9][10][11][12]. Suggestions for the incorporation of other metals into the AlPO 4 -31 framework can be found in three publications for TAPO-31 [13], ZnAPO-31 [3] and MgAPO-31 [3,14], and catalytic applications are reported for TAPO-31 [15], VAPO-31 [16], MnAPO-31 [8,17], NiAPO-31 [17], ZnAPO-31 [17] and FeAPO-31 [18].…”

Section: Introductionmentioning

confidence: 99%

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Framework cobalt and manganese in MeAPO-31 (Me=Co, Mn) molecular sieves

Tušar

Mali

Arčon

et al. 2002

Microporous and Mesoporous Materials

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Pure phases of CoAPO-31 and MnAPO-31 were synthesized hydrothermally using di-n-propylamine as a structuredirecting agent. The incorporation of manganese(II) and cobalt(II) into framework aluminum sites of AlPO 4 -31 was suggested from elemental, thermogravimetric and X-ray powder diffraction analysis. Isomorphous aluminum substitution with cobalt(II) was confirmed from static 31 P NMR spectra. UV-VIS and XANES spectra revealed a partial oxidation of framework cobalt(II) and manganese(II) into cobalt(III) and manganese(III) in the calcined MeAPO-31 and thus the presence of redox centers in the products. The generation of acid sites (Brønsted and Lewis) in MeAPO-31 was supported by IR measurements of pyridine and by ammonium adsorption/desorption. The strength of the acid sites in the catalysts studied decreased in the following order: MnAPO-31 > CoAPO-31 > AlPO 4 -31.

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Section: Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Framework cobalt and manganese in MeAPO-31 (Me=Co, Mn) molecular sieves

Tušar

Mali

Arčon

et al. 2002

Microporous and Mesoporous Materials

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“…A case in point is the one template/multiphase phenomenon. For example, dipropylamine (DPA) as one of the simplest amines have been demonstrated to be able to direct the synthesis of at least 10 different structure types of microporous materials [20,21]. Another example is the multiple template/single phase phenomenon, as evidenced by SAPO-34 synthesis.…”

Section: Introductionmentioning

confidence: 97%

N-methyldiethanolamine: A multifunctional structure-directing agent for the synthesis of SAPO and AlPO molecular sieves

Wang

Tian

Fan

et al. 2015

Journal of Colloid and Interface Science

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“…As can be seen, SB-M and SB-H samples showed two 27 Al signals at 36.1 and 52.3 ppm, which respectively originated from tetrahedral aluminum in the framework of SAPO-11 and HBeta. In addition, SB-H sample presented a new weak 27 Al signal at 5.6 ppm, due to the presence of a small amount of amorphous aluminum in the sample[7,8].…”

mentioning

confidence: 99%

SAPO-11/HBeta composites for catalytic cracking of 2-butylene: effects of defect structure

Zhang

Wang²,

Zhong³

et al. 2006

Catal Lett

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SAPO-11/HBeta composite was synthesized by using hydrothermal method (SB-H) and applied as catalyst for cracking of 2-butylene to C 2 -C 3 olefins. SB-H sample exhibited comparatively high selectivity and high yield of C 2 -C 3 olefins. XRD, IR, 27 Al and 31 P MAS NMR, Py-IR characterizations indicate that defect structure P(AlO 4 ) n (n < 4) really existed in SB-H sample. SAPO-11 and HBeta chemically bonded and the defect P(AlO 4 ) n (n < 4) formed during the hydrothermal synthesis of SB-H sample. P(AlO 4 ) n (n < 4) unit caused new B acidic sites, which increased B acidic amount and B acidic distribution on SB-H sample. The improvement of B acidity decreased apparent active energy of cracking of 2-butylene to C 2 -C 3 olefins on SB-H sample. Therefore, the high selectivity and high yield of C 2 -C 3 olefins were obtained on SB-H sample in catalytic cracking of 2-butylene.

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Silicoaluminophosphate molecular sieves SAPO-11, SAPO-31 and SAPO-41: synthesis, characterization and alkylation of toluene with methanol

Cited by 54 publications

References 22 publications

Framework cobalt and manganese in MeAPO-31 (Me=Co, Mn) molecular sieves

Framework cobalt and manganese in MeAPO-31 (Me=Co, Mn) molecular sieves

N-methyldiethanolamine: A multifunctional structure-directing agent for the synthesis of SAPO and AlPO molecular sieves

SAPO-11/HBeta composites for catalytic cracking of 2-butylene: effects of defect structure

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