Synthesis and catalytic performances of hierarchical SAPO-34 monolith

Yang, Hu; Liu, Zhicheng; Gao, Hanfei; Xie, Zaiku

doi:10.1039/b924736j

Cited by 118 publications

(89 citation statements)

References 27 publications

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“…However, the latter catalyst has a much shorter lifetime than ZSM-5 due to the extension of coking reactions inside the cages of the CHA structure, and a continuous catalyst regeneration process is required. Lifetime of SAPO-34 can be extended by using mesoporous SAPO-34 [8][9][10][11][12], by decreasing the size of the crystal [13][14][15][16][17][18] or by including metal oxides in the catalyst composition [19]. Smaller crystallites of SAPO-34 were achieved recently by heating the synthesis gel in a microwave apparatus [20,21].…”

Section: Introductionmentioning

confidence: 99%

Conversion of methanol to olefins: Stabilization of nanosized SAPO-34 by hydrothermal treatment

Martínez‐Triguero

et al. 2015

Journal of Catalysis

109

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properties and high lifetime during the reaction of methanol to olefins (MTO) are preserved, despite the decrease in acidity, even after months of contact with moisture.The stabilization effect is attributed to the migration of silicon to larger silicon islands in which the contribution of silicon on the edge is lower after steaming. Stabilization is not successful by a thermal treatment in air in the absence of water. Steaming at temperature >400ºC is required for achieving hydrothermal stabilization. A stability test for SAPO-34 in MTO reaction is proposed.

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Section: Introductionmentioning

confidence: 99%

Conversion of methanol to olefins: Stabilization of nanosized SAPO-34 by hydrothermal treatment

Martínez‐Triguero

et al. 2015

Journal of Catalysis

109

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“…Therefore, its application prospect and future development in modern petrochemical industry are restrained greatly [16], especially for the conversion of large molecules as those encountered in heavy crude oil catalytic cracking process [17,18]. In order to overcome limitations of single microporous or mesoporous molecular sieves and to make preponderance complementarity between the two type molecular sieves, some research groups had extended new synthesis strategy to prepare mesoporous SAPO [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Catalytic cracking of 1, 3, 5-triisopropylbenzene over silicoaluminophosphate with hierarchical pore structure

Jin

Zhao

et al. 2015

J Porous Mater

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In order to prepare a highly active catalyst for the catalytic cracking of larger molecules, a novel micromesoporous silicoaluminophosphate composite (define as mesoporous SAPO-5) with hierarchical tri-modal pore size distributions has been firstly synthesized via post-synthetic method in acidic condition and subsequently characterized. Morphology control of the composite is attempted by adjusting pH value of the synthetic system. Three different morphologies of composite, including sphere-, rod-and net-like, are obtained in the different conditions. Possible mechanism for the formation of mesoporous SAPO-5 has been proposed. The mesoporous SAPO-5 exhibits higher cracking activity than conventional microporous SAPO-5 for cracking of 1, 3, 5-triisopropylbenzene (1, 3, 5-TIPB) under the same reaction conditions. The result indicates that the mesoporous SAPO-5 with hierarchical pore structure is favorable for catalytic cracking of large molecule. When the cumene as the reaction molecule, the microporous SAPO-5 catalyst exhibits higher conversion in catalytic cracking of cumene compared to the mesoporous SAPO-5, and the result may be attributed to that microporous SAPO-5 has much stronger acidity and specific selectivity than mesoporous SAPO-5 catalyst in catalytic cracking of cumene. Meanwhile, corresponding carbenium ion mechanism can account for the products formed during the whole reaction process.

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“…It has been reported that macroporous SAPO-34 can be prepared by using a dry gel conversion method. However, the macropores are actually an aggregated structure and could easily be changed by changing the conditions used for synthesis [19]. Polystyrene spheres (PS) as hard templates have attracted much attention [20,21].…”

Section: Introductionmentioning

confidence: 99%

Preparation of macroporous SAPO-34 microspheres by a spray drying method using polystyrene spheres as hard template

et al. 2011

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Macroporous microspheres of were fabricated using polystyrene spheres (PS, 2 lm) as hard template. Cubic (1 lm) synthesized by the conventional hydrothermal method was mixed with kaolin, silica sol, aluminium phosphate sol, template, and deionized water. Spray drying was then performed to prepare 30-50 lm microspheres which were converted to macroporous SAPO-34 by post-hydrothermal and calcination treatments. For comparison, 30-50 lm non-macroporous microspheres (NOMISAPO-34) were also obtained without using PS. XRD, NH 3 -TPD, and SEM analyses were used to characterize the macroporous and non-macroporous SAPO-34. The results showed that MAMISAPO-34 was more crystalline and had more strong acid sites than NOMISAPO-34. When used in MTO (methanol to olefins) reactions, MAMISAPO-34 had better catalytic performance than NOMISAPO-34, because of its greater crystallinity.

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Synthesis and catalytic performances of hierarchical SAPO-34 monolith

Cited by 118 publications

References 27 publications

Conversion of methanol to olefins: Stabilization of nanosized SAPO-34 by hydrothermal treatment

Conversion of methanol to olefins: Stabilization of nanosized SAPO-34 by hydrothermal treatment

Catalytic cracking of 1, 3, 5-triisopropylbenzene over silicoaluminophosphate with hierarchical pore structure

Preparation of macroporous SAPO-34 microspheres by a spray drying method using polystyrene spheres as hard template

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