Deposition of fluorocarbon films by Pulsed Plasma Thruster on the anode side

Zhang, Rui; Zhang, Daixian; Zhang, Fan; He, Zhen; Wu, Jianjun

doi:10.1016/j.apsusc.2013.01.029

Cited by 14 publications

(15 citation statements)

References 11 publications

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“…Moreover, the left vacant T‐atom sites associated with silanol groups in β zeolites after dealumination could accommodate and anchor metal species,,, attributable to the reaction between metal species and silanol groups ,. It has been reported the exchanged Zn 2+ ions or Zn(OH) + species in Al‐containing zeolites are active for catalyzing PDH ,,. The issue of this kind of catalysts is that a large proportion of Zn species is prone to form macrocrystalline ZnO on the external zeolite surface, and thus SN ZnO with catalytic potential are hard to be obtained .…”

Section: Introductionmentioning

confidence: 99%

ZnO Nanoclusters Supported on Dealuminated Zeolite β as a Novel Catalyst for Direct Dehydrogenation of Propane to Propylene

et al. 2019

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Small ZnO nanoclusters supported on dealuminated β zeolite were prepared and evaluated for catalyzing direct dehydrogenation of propane to propylene (PDH), exhibiting high catalytic performance. N2 sorption, XRD, TEM, 27Al and 28Si MAS NMR, IR, XRF, DR UV‐vis, XPS, and NH3‐TPD techniques were employed to characterize the physicochemical properties of this novel catalyst system. It is found that the Zn species can be accommodated in the vacant T‐atom sites of dealuminated β zeolite due to the reaction of aqueous zinc acetate solution with silanol groups, and thus, producing massive small ZnO nanoclusters as active phases in PDH. Additionally, dealuminated β zeolite can greatly depress side reactions attributable to the absence of strong acid sites, thereby guaranteeing high catalytic activity, propylene selectivity and stability. As a result, the optimal catalyst of 10 wt% Zn loaded on dealuminated β zeolite exhibits a high initial propane conversion of around 53 % and a superior propylene selectivity of about 93 % at a space velocity of 4000 cm3 gcat−1 h−1, together with the high stability and satisfactory reusability. This study may open a new way to design and synthesize highly active PDH catalysts with high selectivity and stability.

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Section: Introductionmentioning

confidence: 99%

ZnO Nanoclusters Supported on Dealuminated Zeolite β as a Novel Catalyst for Direct Dehydrogenation of Propane to Propylene

et al. 2019

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“…In addition, introducing Ga has been demonstrated to facilitate the desorption of propene and greatly suppress deep dehydrogenation and coke formation . The effects of other promoters, such as Cu, Zn, La, and Fe, have also been studied, with the purpose to enhance the dispersion of the Pt particles, inhibit the sintering of the metal phase, suppress the C−C bond rupture and improve the catalyst stability. Among these modified catalysts, the PtSnNaLa/ZSM‐5 catalyst exhibited the best stability for propane dehydrogenation, achieving a mean yield of 34.3 % propene during 82 h reaction…”

Section: Recent Development Of Commercial Dehydrogenation Catalystsmentioning

confidence: 99%

Recent Progress in Commercial and Novel Catalysts for Catalytic Dehydrogenation of Light Alkanes

Wang

Zhu

2019

The Chemical Record

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Catalytic dehydrogenation of light alkanes can effectively produce olefins and hydrogen. Even though Pt and CrOx‐based catalysts are widely applied in industry, research to improve the activity and stability of these catalysts continued. This review summarizes important achievements obtained in recent years, focusing on the development of supports, promoters and preparation methods of Pt and CrOx‐based catalysts, which mainly aimed to improve the dispersion of the active species and to enhance coke resistance. Furthermore, the high cost of Pt‐based catalysts and environmental problems encountered with CrOx‐based catalysts have spurred the development of alternative catalysts. The dehydrogenation performances and characteristics of promising alternative VOx‐, modified Ni‐ and Sn‐based catalysts are also reviewed. Comparison with the catalytic reforming process of naphtha further probes the necessity of catalyst acidity in these two different processes. The choice of the dehydrogenation reactor is discussed, and future perspectives and research directions are indicated.

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“…Because of the advantages of low-cost, low-mass, and high specific impulse, electric propulsion thrusters (EPTs) for spacecraft orbit correction and interplanetary spacecraft acceleration have recently become the front subject and focal point in space propulsion fields [1,2]. As a member of EPTs, pulsed plasma thruster (PPT) has a broad prospect on small satellites for its small, compact, and low mass [3][4][5]. PPT has been studied decades on its performance and lifetime, and has been successfully applied to a number of satellites [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Plasma Generation and Application in a Laser Ablation Pulsed Plasma Thruster

Wu¹,

Cheng²,

Huang³

et al. 2019

Plasma Science and Technology - Basic Fundamentals and Modern Applications

Self Cite

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The laser ablation plasma thruster is a novel electric propulsion thruster, which combined the laser ablation and electromagnetic acceleration. In order to investigate the plasma expansion and ionization in the laser ablation plasma thruster, which was difficult to obtain from experiments, the heat conduction model and fluid dynamics model were established. The heat conduction model was established to calculate the target ablation, taking into account temperature-dependent material properties, phase transition, dielectric transition and phase explosion. The fluid dynamics model was used to calculate the plasma properties, taking into account ionization, plasma absorption and shielding. The ablation plasma velocity, temperature and electron number density were predicted by using the numerical method. The calculated results showed that the peak values of ablation plasma velocity, temperature and electron number density fraction were distributed at the front of the plasma plume. Moreover, the discharge characteristics and thrust performance were tested with different charged energy, structural parameters and propellants. The thrust performance was proven to be improved by electromagnetic acceleration.

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Deposition of fluorocarbon films by Pulsed Plasma Thruster on the anode side

Cited by 14 publications

References 11 publications

ZnO Nanoclusters Supported on Dealuminated Zeolite β as a Novel Catalyst for Direct Dehydrogenation of Propane to Propylene

ZnO Nanoclusters Supported on Dealuminated Zeolite β as a Novel Catalyst for Direct Dehydrogenation of Propane to Propylene

Recent Progress in Commercial and Novel Catalysts for Catalytic Dehydrogenation of Light Alkanes

Plasma Generation and Application in a Laser Ablation Pulsed Plasma Thruster

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