Temat: ZSM-5 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Effect of boron on ZSM-5 catalyst for methanol to propylene conversion
Autorzy:: Xu, A.
Ma, H.
Zhang, H.
Ying, W.
Fang, D.
Powiązania:: https://bibliotekanauki.pl/articles/777971.pdf
Data publikacji:: 2013
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: methanol to propylene
ZSM-5
boron modifi cation
propylene
Opis:: B-ZSM-5 catalysts were prepared by various modification methods with boric acid, including ion-exchange, impregnation and direct synthesis. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), NH3-Temperature Programmed Desorption (NH3-TPD), N2 adsorption-desorption, Fourier Transform Infrared spectrometry (FT-IR), 27Al and 11B MAS NMR spectra. The results revealed that the weak acidity of catalysts was significantly increased by modification. The catalytic activity was measured in a fixed bed at 460°C for methanol to propylene (MTP) reaction. The results of MTP reaction showed a great increment of the propylene selectivity for the boron modified samples, especially for the directly synthesized B-ZSM-5 which also displayed high activity and selectivity towards C2 =-C4 = olefins. It was found that the remarkable selectivity strongly depended on the intensity of weak acidity.
Źródło:: Polish Journal of Chemical Technology; 2013, 15, 4; 95-101
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Synthesis and characterization of TiO2/ZSM-5 photocatalysts for degradation of rhodamine
Autorzy:: Liu, Rulai
Hu, Jiapeng
Rau, Juiye
Lin, Hao
He, Huan
Gao, Biao
Lai, Wenliang
Powiązania:: https://bibliotekanauki.pl/articles/2086909.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: photodegradation
TiO2
ZSM-5
kaolin clay
fotodegradacja
glinka kaolinowa
Opis:: ZSM-5 synthesized by the hydrothermal method from raw kaolin clay was used as support to prepare TiO2/ZSM-5 catalysts via the sol-gel method. All prepared samples were characterized by X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), transmission electron microscopy (TEM), particle size analysis and surface area measurement. The photocatalytic performance of TiO2/ZSM-5 was investigated based on rhodamine B (RhB) removal under UV radiation (450-600 nm. The results showed that the kaolin clay was successfully transformed into ZSM-5. The BET surface area and pore size distribution of the synthesized ZSM-5 were 364 m2/g and 0.54 nm, respectively. SEM and TEM revealed that TiO2 nanoparticles were well distributed on the surface of ZSM-5. The composite TiO2/ZSM-5 catalyst showed 98.53% removal, which is higher than that of pure TiO2 (80.13%) due to adsorption and degradation of RhB (5.0 mg/dm3) under 60 min UV light irradiation at 1 g/dm3 photocatalyst loading. The synergistic effect of TiO22 and ZSM-5, including adsorption, conduction band electron (e-), and valence-band holes (h+), makes the composite superior to pure TiO2, showing its potential for the degradation of organic dye.
Źródło:: Environment Protection Engineering; 2022, 48, 2; 29--42
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Catalytic pyrolysis of metal free PCBs with ZSM-5 and Ca(OH)2
Autorzy:: Pandere, Vaibhav
Gautam, Alok
Gautam, Shina
Powiązania:: https://bibliotekanauki.pl/articles/2173423.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: catalytic pyrolysis
PCBs
ZSM-5
Ca(OH)2
fuels
PCB
paliwo
Opis:: Presence of heavier molecules and toxic brominated compounds in pyrolysis products of printed circuit boards (PCB) make their use difficult. In the present work to overcome this problem PCBs were pyrolyzed in presence of catalysts such as ZSM-5 and Ca(OH)2 to study their effect on pyrolysis products. The comparison of non-catalytic pyrolysis of PCB was done with oil and gas compositions produced by both techniques. Pyrolysis experiments were done at a lab scale set-up. However, the increased concentrations of ZSM-5 were found to increase char and gases were found to be rich in CH4 and O2. The composition of oils was mainly composed of phenols, phenol derivatives and aromatic compounds, which increased with pyrolysis with ZSM-5 and Ca(OH)2. Ca(OH)2 was found effective in removing brominated compounds from oil and no halogens were observed in oil. Char produced during pyrolysis was mesoporous in nature and composed of some fractions of metals and glass fibers.
Źródło:: Chemical and Process Engineering; 2022, 43, 2; 171--182
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Bezpośrednia konwersja biometanu zawierającego CO₂ i H₂O do wodoru i węglowodorów
Direct catalytic conversion of biomethane with CO₂ i H₂O towards hydrogen and hydrocarbons
Autorzy:: Malinowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/1286917.pdf
Data publikacji:: 2011
Wydawca:: Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:: dehydrokondensacja
biometan
waloryzacja metanu
katalizator Re i Mo/ ZSM -5
węglowodory
wodór
katalizator dwufunkcyjny
dehydrocondensation
biomethane
methane valorization
catalyst Re/Mo ZSM-5
hydrocarbons
hydrogen
bifunctional catalyst
Opis:: Praca dotyczy katalitycznej konwersji biometanu, z zawartością całkowitą do 2,5% CO₂ i H₂O, do wodoru, związków aromatycznych i innych węglowodorów. Reakcja była prowadzona przy użyciu typowego katalizatora Mo/HZSM -5, nowego Re/HZSM -5 z i bez dodatków związków utleniających (CO₂, H₂O) w strumieniu metanu. Obecność CO₂ i H₂O w strumieniu metanu wpływa pozytywnie na stabilność i aktywność wymienionych katalizatorów. Z drugiej strony, brak wymienionych utleniaczy w strumieniu metanu spowodował spadek aktywności Re/HZSM -5 i niestabilną pracę katalizatora.
This paper presents results of catalytic conversion of biomethane, with total amount up to 2.5% of CO₂ and H₂O in CH4 stream, to hydrogen and aromatics and other hydrocarbons. Reaction was carried out on the typical catalyst Mo/HZSM -5, new one Re/HZSM - 5 with and without oxidants (CO₂, H₂O) in methane stream. The presence of CO₂ and H₂O in methane stream has a positive effect on stability and activity of catalysts. On the other hand the lack of CO₂ and H₂O in methane stream caused deactivation of Re/HZSM -5 and unstable work of catalyst.
Źródło:: Chemik; 2011, 65, 6; 520-524
0009-2886
Pojawia się w:: Chemik
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Phenol oxidation with hydrogen peroxide using Cu/ZSM5 and Cu/Y5 catalysts
Autorzy:: Valkaj, K. M.
Wittine, O.
Margeta, K.
Granato, T.
Katović, A.
Zrnčević, S.
Powiązania:: https://bibliotekanauki.pl/articles/778896.pdf
Data publikacji:: 2011
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: oczyszczania ścieków
utlenianie fenolu
nadtlenek wodoru
katalizator
Cu/ZSM5
Cu/Y5
wastewater treatment
phenol oxidation
hydrogen peroxide
catalysts
Opis:: In this work, catalytic activity and stability of Cu/Y5 and Cu/ZSM5 zeolites in phenol oxidation with hydrogen peroxide were examined. The catalyst samples were prepared by the ion exchange method of the protonic form of commercial zeolites. The catalysts were characterized by the powder X-ray diffraction (XRD), AAS, while the adsorption techniques were used to measure the specific surface area. The thermal programmed desorption of NH3 (NH3-TPD) was used for measuring the total number of acid sites formed on the surface of zeolites. Catalytic performance of the prepared samples was monitored in terms of phenol, hydrogen peroxide and total organic carbon (TOC) conversion, by-product distribution and a degree of copper leached into the aqueous solution. It was found that the activity of Cu/Y5 catalyst was generally higher than that of Cu/ZSM5 and that unlike Cu/ZSM5, Cu/Y5 catalyzed phenol oxidation more completely.
Źródło:: Polish Journal of Chemical Technology; 2011, 13, 3; 28-36
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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