Ag supported on alumina for the epoxidation of 1-hexene with molecular oxygen: the effect of Ag<sup>+</sup>/Ag<sup>0</sup>

Ren, Jingzhao; Wang, Liancheng; Li, Penghui; Xing, Xiangying; wang, huixiang; Lv, Baoliang

doi:10.1039/d1nj05926b

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…The epoxidation of long-chain linear α-olefins to produce industrially valuable epoxides plays a pivotal role in modern chemical industry, as it provides essential feedstock for the production of plasticizers, surfactants, and other fine chemicals [1][2][3][4]. Traditionally, this process relied on organic peracids as oxygen donors.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Catalytic Efficiency in Long-Chain Linear α-Olefin Epoxidation: A Study of CaSnO3-Based Catalysts

Zhang,

Xiang,

Wen

2024

Catalysts

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This investigation explores the synthesis of advanced catalysts for epoxidizing long-chain linear α-olefins, a pivotal process in the chemical industry for generating critical intermediates. Employing a hydrothermal technique, we developed four distinct catalysts (CS-1–4), methodically modulating the Ca/Sn ratio to elucidate its impact on the catalysts’ physicochemical properties. Our research uncovered that an escalated Ca/Sn ratio induces a morphological shift from octagonal to cubic structures, concomitant with a diminution in particle size and an enhancement in specific surface area. Significantly, the CS-3 catalyst outperformed others in 1-octene epoxidation, an efficacy attributed to its augmented surface alkalinity and proliferation of medium-strength alkaline sites, likely emanating from increased surface oxygen defects. Subsequent hydrogen reduction of CS-3 further amplified these oxygen defects, yielding a 10% uptick in catalytic activity. This correlation underscores the potential of oxygen defect manipulation in optimizing catalytic efficiency. Our findings contribute a novel perspective to the development of robust, high-performance catalysts for α-olefin epoxidation, seamlessly aligning with the principles of sustainable chemistry.

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Section: Introductionmentioning

confidence: 99%

Enhancing Catalytic Efficiency in Long-Chain Linear α-Olefin Epoxidation: A Study of CaSnO3-Based Catalysts

Zhang,

Xiang,

Wen

2024

Catalysts

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“…Epoxides are important raw materials in the chemical industry for the synthesis of glycols, epoxy resins, polyethers, etc. − They are commonly synthesized through the oxidation of olefins by molecular oxygen or peroxides in the presence of metal catalysts. Epoxides can also be synthesized through the dehydrohalogenation of halohydrins through base-driven S N 2 substitution. − However, due to the general consensus of pursuing a sustainable green process, new methods are continuously developed to replace the petrochemical-based routes. − Glycerol, an oversupplied byproduct from biodiesel production, − has therefore been considered as an alternative feedstock for the production of epoxides. − The simplest route to achieve the set target would start with the halogenation of one of the hydroxyl groups to form chloro-propanediol under the presence of an organic acid catalyst such as acetic acid. Then, the base-driven S N 2 substitution can be applied to carry out the ring-closing epoxidation.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Synthesis of Epoxides from Halohydrin Cyclization by Composite Solid-Based Catalysts

Chang

Chen

Tsai

et al. 2022

Ind. Eng. Chem. Res.

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A facile synthesis of CaO- and MgO-based composite solid-based catalysts is demonstrated for a sustainable synthesis of epoxides from halohydrin cyclization (i.e., via heterogeneous catalysis). The cyclodehydrohalogenation of 3-chloro-1,2-propanediol (3-MCH) to glycidol (GLD) was chosen as the representative of the study. The activity, selectivity, and operation stability of the developed composite catalysts versus their material properties were studied through the establishment of a suitable synthesis, characterization, and performance testing platform. An X-ray diffractometer, a scanning electron microscope, a Brunauer–Emmett–Teller N2 adsorption analyzer, a chemisorption analyzer, and an inductively coupled plasma–optical emission spectrometer were used complementarily for the characterization of catalyst materials. The results show that we can successfully synthesize composite solid-based catalysts with adjustable chemical and physical properties, including surface basicity. The liquid–solid reaction system is useful for the mechanistic understanding of the cyclodehydrohalogenation of 3-MCH catalyzed by the solid-based catalysts, especially the byproduct generation paths and the catalyst deactivation by surface poisoning. The results show that the conversion rate of cyclodehydrohalogenation of 3-MCH to GLD was proportional to the amount of total basic sites on the catalyst, and the selectivity to GLD was proportional to the medium basicity strength of the catalyst. The fundamental understanding obtained in this study provides valuable design principles for composite solid-based catalysts for a wide variety of dehydrohalogenation reactions.

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“…3,4 Although the epoxidation of ethylene and propylene with the oxidants of oxygen and hydrogen peroxide (H 2 O 2 ), respectively, has industrialized to date, the electron-deficient nature and steric hindrance retard the progress of long linear terminal olefin epoxidation. [5][6][7][8] Therefore, developing an environmentally friendly and easily available epoxidation process for long linear terminal olefins is desirable.…”

Section: Introductionmentioning

confidence: 99%

Insights into the effect of oxygen vacancies on the epoxidation of 1-hexene with hydrogen peroxide over WO_3−x/SBA-15

Gao

Shi

et al. 2022

Catal. Sci. Technol.

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Ag supported on alumina for the epoxidation of 1-hexene with molecular oxygen: the effect of Ag⁺/Ag⁰

Abstract: Linear terminal olefins epoxidation is an important oxidation reaction that provides valuable chemical intermediates. Heterogeneous catalytic epoxidation with O2 is a “dream reaction” while it is still far away from...

Cited by 6 publications

References 47 publications

Enhancing Catalytic Efficiency in Long-Chain Linear α-Olefin Epoxidation: A Study of CaSnO3-Based Catalysts

Enhancing Catalytic Efficiency in Long-Chain Linear α-Olefin Epoxidation: A Study of CaSnO3-Based Catalysts

Sustainable Synthesis of Epoxides from Halohydrin Cyclization by Composite Solid-Based Catalysts

Insights into the effect of oxygen vacancies on the epoxidation of 1-hexene with hydrogen peroxide over WO_3−x/SBA-15

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Ag supported on alumina for the epoxidation of 1-hexene with molecular oxygen: the effect of Ag+/Ag0

Abstract: Linear terminal olefins epoxidation is an important oxidation reaction that provides valuable chemical intermediates. Heterogeneous catalytic epoxidation with O2 is a “dream reaction” while it is still far away from...

Cited by 6 publications

References 47 publications

Enhancing Catalytic Efficiency in Long-Chain Linear α-Olefin Epoxidation: A Study of CaSnO3-Based Catalysts

Enhancing Catalytic Efficiency in Long-Chain Linear α-Olefin Epoxidation: A Study of CaSnO3-Based Catalysts

Sustainable Synthesis of Epoxides from Halohydrin Cyclization by Composite Solid-Based Catalysts

Insights into the effect of oxygen vacancies on the epoxidation of 1-hexene with hydrogen peroxide over WO3−x/SBA-15

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Product

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About

Ag supported on alumina for the epoxidation of 1-hexene with molecular oxygen: the effect of Ag⁺/Ag⁰

Insights into the effect of oxygen vacancies on the epoxidation of 1-hexene with hydrogen peroxide over WO_3−x/SBA-15