Generators of diffuse plasma at atmospheric pressure

Ерофеев, М. В.; Ripenko, V. S.; Шулепов, М. А.; Тарасенко, В. Ф.

doi:10.1134/s0020441217020038

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…The high-temperature peak, in the region of 350-500 • C with the T m peak at 405 • C, related to the desorption of ammonia with the strongly Bronsted acid sites of the zeolite hydrogen ions of which are bridged hydroxyl groups (Figure 11, curve 1, Table 2). The concentration of weak acid sites for 1% ZnO/99% H-ZKE-XM determined by the amount of desorbed ammonia is 600, and for strong-acid sites, it is 421 μmol/g [12,23]. The modification of H-ZKE-XM 1-5% ZnO leads to a change in their acid characteristics.…”

Section: Study Of the Acidic Properties Of Microporous Zeolite Catalystsmentioning

confidence: 98%

“…The concentration of weak acid sites for 1% ZnO/99% H-ZKE-XM determined by the amount of desorbed ammonia is 600, and for strong-acid sites, it is 421 µmol/g [12,23]. The modification of H-ZKE-XM 1-5% ZnO leads to a change in their acid characteristics.…”

Section: Study Of the Acidic Properties Of Microporous Zeolite Catalystsmentioning

confidence: 99%

“…The activation of the H-ZKE-XM zeolite catalysts modified by 1-5% ZnO was carried out by a low-temperature diffuse discharge plasma formed in atmospheric pressure air at 4 nanosecond voltage pulse with an amplitude of 25 kV applied from an NPG-3500N generator to a point cathode with a small radius of curvature, equal to 0.2 mm [23]. The maximum electron concentration in the plasma of the diffuse discharge was 10 14 cm −1 , with an applied average power of 2 W.…”

Section: Activation Of the H-zke-xm Zeolite Catalysts Modified By 1-5mentioning

confidence: 99%

“…During the low-temperature plasma treatment of the catalysts, oxygen molecules and water vapor were strongly ionized, which were present in the air of the plasma chamber with the formation of O 2− , OH − and H + ions [23]. The resulting O 2− , OH − and H + ions further interacted with various acid sites of the catalyst, resulting in the formation of additional weak and strong acid sites on the surface of modified and plasma-activated zeolite catalysts.…”

Section: Activation Of the H-zke-xm Zeolite Catalysts Modified By 1-5mentioning

confidence: 99%

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Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma

et al. 2020

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The effect of modification of MFI zeolite 1–5 wt.% ZnO activated by plasma on acid and catalytic properties in the conversion of the propane–butane fraction into arenes was investigated. The high-silica zeolites with silicate module 45 were synthesized from alkaline alumina–silica gels in the presence of an ‘X-oil’ organic structure-forming additive. The modification of the zeolite with zinc was carried out by impregnating the zeolite granules in the H-form with an aqueous solution of Zn(NO3)2. The obtained zeolites were characterized by X-ray phase analysis and IR spectroscopy. It is shown that the synthesized zeolites belong to the high-silica MFI zeolites. The study of microporous zeolite-containing catalysts during the conversion of C3-C4 alkanes to aromatic hydrocarbons made it possible to establish that the highest yield of aromatic hydrocarbons is observed on zeolite catalysts modified with 1 and 3% ZnO and amount to 63.7 and 64.4% at 600 °C, respectively, which is 7.7–8.4% more than on the original zeolite. The preliminary activation of microporous zeolites modified with 1–5% ZnO and plasma leads to an increase in the yield of aromatic hydrocarbons from the propane–butane fraction; the maximum yield of arenes is observed in zeolite catalysts modified with 1 and 3% ZnO and activated by plasma, amounting to 64.9 and 65.5% at 600 °C, respectively, which is 8.9–9.5% more than on the initial zeolite. The activity of the zeolite catalysts modified by ZnO and activated by plasma show good agreement with their acid properties. Activation of the zeolites modified by 1 and 3% ZnO and plasma leads to an increase in the concentration of the weak acid sites of the catalyst to 707 and 764 mmol/g in comparison with plasma-inactivated 1 and 3% ZnO/ZKE-XM catalysts at 626 and 572 mmol/g, respectively.

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Section: Study Of the Acidic Properties Of Microporous Zeolite Catalystsmentioning

confidence: 98%

Section: Study Of the Acidic Properties Of Microporous Zeolite Catalystsmentioning

confidence: 99%

Section: Activation Of the H-zke-xm Zeolite Catalysts Modified By 1-5mentioning

confidence: 99%

Section: Activation Of the H-zke-xm Zeolite Catalysts Modified By 1-5mentioning

confidence: 99%

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Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma

et al. 2020

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“…Ерофеев В.И., 2 Ерофеев М.В., 2 Проведены исследования по влиянию плазменной активации на кислотные свойства цеолитных катализаторов Н-ЦКЕ-ХМ [1], модифицированных 1 и 3 % ZnO. Активация производилась низкотемпературной плазмой диффузного разряда, формируемой в воздухе атмосферного давления при подаче 4-х наносекундного импульса напряжения амплитудой 25 кВ от генератора NPG-3500N на острийный катод с малым радиусом кривизны равным 0.2 мм [2]. Максимальная концентрация электронов в плазме диффузного разряда составляла 10 14 см -1 при вкладываемой средней мощности 2 Вт.…”

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VLIJaNIE PRIRODY CINKA NA SELEKTIVNOST'' OBRAZOVANIJa ARENOV IZ PROPAN-BUTANOVOJ FRAKCII NA MODIFICIROVANNYH CEOLITNYH KATALIZATORAH, AKTIVIROVANNYH PLAZMOJ

Jalilova¹

2019

International Workshop "Multiscale Biomechanics and Tribology of Inorganic and Organic Systems" ; Mezhdunarodnaja Konferencija

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Effect of ultraviolet irradiation or diffuse discharge plasma on structure and surface electrical charge of micro-arc calcium phosphate coatings

Комарова

Kazantseva

Ripenko

et al. 2021

J. Phys.: Conf. Ser.

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The studies of the effect of ultraviolet (UV) irradiation and plasma of a runaway electron preionized diffuse discharge (REP DD) post-treatments on the surface structure and electrical charge of the micro-arc oxidation (MAO) coatings were performed. The UV irradiation and plasma treatment did not effect on the morphology, roughness and thickness of the MAO coatings. However, these post-treatments led to formation of the small fraction of the crystalline CaHPO4phase in the X-ray amorphous structure of the coatings. Moreover, the UV and REP DD plasma treatments increased the electrostatic potential (EP) negative values from –85 mV to –126 mV of the coatings in the following order: MAO < MAO/UV (for 5 min) < MAO/Plasma (with 10,000 pulses) < MAO/UV (for 20 min) < MAO/Plasma (with 80,000 pulses).

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Generators of diffuse plasma at atmospheric pressure

Cited by 5 publications

References 11 publications

Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma

Conversion of the Propane–Butane Fraction into Arenes on MFI Zeolites Modified by Zinc Oxide and Activated by Low-Temperature Plasma

VLIJaNIE PRIRODY CINKA NA SELEKTIVNOST'' OBRAZOVANIJa ARENOV IZ PROPAN-BUTANOVOJ FRAKCII NA MODIFICIROVANNYH CEOLITNYH KATALIZATORAH, AKTIVIROVANNYH PLAZMOJ

Effect of ultraviolet irradiation or diffuse discharge plasma on structure and surface electrical charge of micro-arc calcium phosphate coatings

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