Oxidation of Cyclohexane by Transition Metal Oxides on Zeolites

Riley, Christopher

doi:10.2174/1876214x01205010008

Cited by 10 publications

(4 citation statements)

References 13 publications

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“…The infrared spectrum for the as-synthesized NaY zeolite shows significant peaks from 1400 to 400 cm -1 , compared to the relevant spectrum assigned by Flanigen and Khatami [34,35]. The absorption bands at 1034 (ν as ), 707 (ν s ) and 452 cm -1 are three lattice modes associated with internal vibrations of the (Si, Al)O 4 tetrahedral unit which designated as TO 4 in the framework of Y zeolite and are structure-insensitive. The structuresensitive vibrations due to external linkages between tetrahedra are found at 1158 (ν as ) and 584 cm -1 due to double 6-rings (D6Rs).…”

Section: Ft-ir Spectra Of Zno/nay Zeolitementioning

confidence: 85%

“…Zeolite Y is characterized by a high surface area, uniform pore size distribution, inner pore diameter of 12 Å and a relatively large pore opening of 7.4 Å [3]. Due to the uniformity and large pore dimensions, zeolite Y is chosen as a host for many transition metal complexes which form the active dopants upon deposition [4]. Zeolite Y based-encapsulated metal complexes could be considered as novel catalysts, owing to which possess the so-called bi-functional catalysts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Synthesis of Nay Zeolite from Rice Husk Silica: Modification with Zno and Zns for Antibacterial Application

Salama¹,

Othman²

2016

Chem Sci J

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Zeolite Y in the sodium form (NaY) was synthesized using amorphous silica ash derived from waste rice husks under hydrothermal conditions. Structural characterization of NaY before and after modification with ZnO and ZnS has been done using powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption-desorption at -196 °C, scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The effects of the Na 2 O/SiO 2 and Si/Al ratios, aging temperature and crystallization time on the optimized synthesis of NaY were thoroughly investigated. Thus the regulated Na + impurity concentration in the starting hydrogel was found to act as a template-assisted synthesis of zeolite NaY by the potential incorporation of Al atoms into the zeolite framework. Results of surface analyses indicate that the interactions of ZnO and ZnS with NaY zeolite are distinguishable and thus the higher interaction is observed for the latter. While Zn II has experienced electrostatic bonding interaction with the framework oxygen atoms, creation of mesopores in NaY due to local destruction of the zeolite lattice around the growing ZnS particles was evidenced. Wonderfully, ZnS/NaY exhibited a high performance in prohibiting the growth of Escherichia coli (E. coli) and negligible from P. Aeruginosa, and these important features make it a potential candidate as an antimicrobial agent for controlling implant-related infections.the utilization of silica from RH for the synthesis of various types of zeolite [8][9][10][11][12][13][14], and mesoporous silica such as . Efforts have also been made to use RH as a source of silica for the synthesis of NaY zeolite with the autoclave process. This low-cost process may lead to production of zeolite NaY to be economically able to compete with established commercial zeolite [16]. Zeolites could selectively adsorb biopolymers like protein, DNA, and RNA, and therefore could be used as chromatographic carriers for these molecules [17][18][19][20]. For these reasons, zeolites would be able to selectively adsorb microbial cells and could be used as cell separation carriers in their native state without surface modifications. Zeolites could adsorb each of the bacterial cell species with high selectivity even from a mixed suspension and could therefore be used as effective carrier materials to provide an easy, rapid and accurate method for cell separation [21]. Zinc oxide supported on zeolite with novel physicochemical properties has recently synthesized [22]. There are some reports regarding the industrial uses of ZnO/ zeolite [23][24][25]. This system can also provide significant impact on the design of a controlled-release product for the pharmacological application in alleviating post-weaning diarrhea of piglets.The aim of this research was to use the RH as an amorphous silica source in the synthesis of NaY zeolite under the optimized experimental conditions. The effects of gel aging and crystallization conditions for the synthesis of NaY under fully optimiz...

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Section: Ft-ir Spectra Of Zno/nay Zeolitementioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Novel Synthesis of Nay Zeolite from Rice Husk Silica: Modification with Zno and Zns for Antibacterial Application

Salama¹,

Othman²

2016

Chem Sci J

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“…Застосування каталітичних систем, які поряд із нафтенатом кобальту (НК) містять кисневмісні добавки різної природи, є ефективним способом впливу на швидкість та селективність процесів окиснення вуглеводнів різних класів [6,7]. Результати виконаних досліджень відкривають широкі можливості цілеспрямованого створення нових перспективних каталітичних та ініціювальних систем для процесів окиснення [8,9]. Концентрації побічних продуктів окиснення циклогексану (зокрема СО, СО 2 , нижчих дикарбонових та монокарбонових кислот, циклогексилформіату) не перевищували похибки аналізу і тому їх не визначали.…”

Section: вступunclassified

Use of Chromoxane in the Oxidation of Cyclohexane

Ludyn¹,

Reutskyy²

2022

CTAS

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Ways of using chromoxane in the process of cyclohexane oxidation are considered. Various technological parameters of chromoxane use in the process of cyclohexane oxidation and their influence on the main indicators of this process have been studied. The combined effect of chromoxane in binary systems with different salts of metals of variable valence on their catalytic activity in the oxidation of cyclohexane was determined.

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“…Heterogeneous catalysts have been studied widely for the selective oxidation of cyclohexane [7][8][9][10][11][12][13][14] conversion and selectivities >75%), notably Co 3 O 4 and mixed Fe-Co oxide nanocrystals [7,15,16]. In addition, the reusability of these materials seems to be superior, as they are reported to maintain their efficiency for 5-6 reaction runs.…”

Section: Introductionmentioning

confidence: 99%

Selective oxidation of cyclohexane: Ce promotion of nanostructured manganese tungstate

Graça

Alshihri

Chadwick

2018

Applied Catalysis A: General

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Cyclohexane selective oxidation over nanostructured MnWO 4 promoted with increasing amounts of Ce (1-5 wt%) has been investigated at mild conditions using molecular oxygen as oxidant. MnWO 4 nanorods were found to be an active catalyst for cyclohexane selective oxidation with selectivity to KA oil (cyclohexanol+cyclohexanone) of approximately 85%. The catalytic performance was improved by impregnation with 1wt% Ce while the textural properties and crystallinity were preserved and Ce was well-dispersed on the surface. XPS analysis of 1%Ce-MnWO 4 showed Ce to be present mainly as Ce 3+ , which is known to promote oxygen adsorption, activation, and mobility. At higher Ce content, the proportion of Ce 4+ increased to be the main Ce species and large, heterogeneouslydispersed Ce oxide particles are formed on the catalyst surface. The lower Ce 3+ content reduces the promoting effect while the large Ce oxide particles block access to the active sites on the surface of the MnWO 4 nanorod. MnWO 4 and 1%Ce-MnWO 4 nanorods were shown to retain their selective oxidation performance in consecutive reaction runs. Surprisingly, physical mixtures of nanostructured MnWO 4 and a CeO 2 nanopowder showed enhanced selective oxidation activity compared to MnWO 4 alone reaching a plateau at 25-50wt% CeO 2 , whereas CeO 2 nanopowder itself was found to to be inactive at the reaction conditions. Ce promoted MnWO 4 shows promise as a catalyst for selective oxidation of cyclohexane and performs at least as well as the most active non-metallic heterogeneous catalysts reported in the literature.

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Oxidation of Cyclohexane by Transition Metal Oxides on Zeolites

Cited by 10 publications

References 13 publications

Novel Synthesis of Nay Zeolite from Rice Husk Silica: Modification with Zno and Zns for Antibacterial Application

Novel Synthesis of Nay Zeolite from Rice Husk Silica: Modification with Zno and Zns for Antibacterial Application

Use of Chromoxane in the Oxidation of Cyclohexane

Selective oxidation of cyclohexane: Ce promotion of nanostructured manganese tungstate

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