Co2+-exchanged SAPO-5 and SAPO-34 as efficient heterogeneous catalysts for aerobic epoxidation of alkenes

Tang, Bo; Lu, Xinhuan; Zhou, Dan; Tian, Peng; Niu, Zhiqiang; Zhang, J.-L.; Chen, X.; Xia, Qinghua

doi:10.1016/j.catcom.2012.11.011

Cited by 25 publications

(4 citation statements)

References 35 publications

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“…Clearly, Cobalt is an effective component for catalyzing the epoxidation of styrene with oxygen, and hence widely used in the field of epoxidation of alkenes with O 2 or air [45e53]. A few previous researches revealed that the reaction solvent (DMF) could easily coordinate to cobalt(II), and such a coordination affected the binding ability of O 2 to the Co(II) as well as their redox potential, further leading to the activation of O 2 in the epoxidation [28,38,39].…”

Section: Effect Of Reaction Conditions On the Activity Of Co-sapo-5-0mentioning

confidence: 99%

“…Very recently, our group has reported the efficiencies of simple ion-exchanged Co-ZSM-5 and Co-Beta [38], Co-SAPO-34 [28], Co-5A and Co-MOR [39] for dissociating triplet ground state of O 2 to epoxidize singlet olefins with a high conversion and selectivity. It is noteworthy that the above-stated zeolites or molecular sieves were hydrothermally synthesized with organic quaternary ammonium ions or amines as structure-directing agents.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Wei

Zhang

et al. 2015

Microporous and Mesoporous Materials

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Section: Effect Of Reaction Conditions On the Activity Of Co-sapo-5-0mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Wei

Zhang

et al. 2015

Microporous and Mesoporous Materials

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“…Oxygen, considered as the most ideal green oxidant, is abundant, inexpensive, and environmental friendly. Tremendous efforts have been made to realize the epoxidation by using molecule oxygen as the oxidant in recent years. − However, problems still exist, such as having a narrow substrate scope, using excessive co-reductants, or using toxic compounds. Metal catalysts (such as Au, ,, Ag, , Cu, and metal–porphyrin , ) are broadly used in aerobic epoxidation (Figure d).…”

Section: Introductionmentioning

confidence: 99%

Sustainable and Practical Access to Epoxides: Metal-Free Aerobic Epoxidation of Olefins Mediated by Peroxy Radical Generated In Situ

Tang

Zhao

et al. 2019

ACS Sustainable Chem. Eng.

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A sustainable and practical protocol to prepare epoxides has been established by using air as the oxidant in the presence of K2CO3 in isopropylbenzene (CM) at 80–140 °C. The olefins are successfully converted into their corresponding epoxides in yields of up to 99%. CM and K2CO3 are reused in the scale-up recycling experiments. A reaction mechanism dominated by the radical pathway is proposed according to the control experiments and kinetic analysis.

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“…In 1984, Lok et al [4] developed a new class of zeolite-like inorganic crystal silicoaluminophosphates denoted as SAPO-n (n indicates a structural type), whose structures were constructed with SiO 4 , AlO 4 and PO 4 . Microporous SAPO-5 as an important member of SAPO-n silicoaluminophosphates has been extensively studied as catalysts [5][6][7]. However, microporous SAPO-5 cannot be used as catalysts for reactions involving large molecules due to its small pores, severely limiting the applied scope in large molecule reactions [8].…”

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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Co2+-exchanged SAPO-5 and SAPO-34 as efficient heterogeneous catalysts for aerobic epoxidation of alkenes

Cited by 25 publications

References 35 publications

Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Synthesis and catalytic application of SAPO-5 by dry-gel conversion for the epoxidation of styrene with air

Sustainable and Practical Access to Epoxides: Metal-Free Aerobic Epoxidation of Olefins Mediated by Peroxy Radical Generated In Situ

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

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