TY - JOUR AU - Hegedüs, Balázs AU - Palotás, Árpád Bence AU - Muránszky, Gábor AU - Dobó, Zsolt TI - Investigation of gasoline-like transportation fuel obtained by plastic waste pyrolysis and distillation JF - JOURNAL OF CLEANER PRODUCTION J2 - J CLEAN PROD VL - 447 PY - 2024 SN - 0959-6526 DO - 10.1016/j.jclepro.2024.141500 UR - https://m2.mtmt.hu/api/publication/34824897 ID - 34824897 LA - English DB - MTMT ER - TY - JOUR AU - Hatvani-Nagy, Alpár Ferencz AU - Hajdu, Viktória AU - Ilosvai, Mária Ágnes AU - Muránszky, Gábor AU - Sikora, Emőke AU - Kristály, Ferenc AU - Daróczi, Lajos AU - Viskolcz, Béla AU - Fiser, Béla AU - Vanyorek, László TI - Bentonite as eco-friendly natural mineral support for Pd/CoFe2O4 catalyst applied in toluene diamine synthesis JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 14 PY - 2024 IS - 1 PG - 9 SN - 2045-2322 DO - 10.1038/s41598-024-54792-5 UR - https://m2.mtmt.hu/api/publication/34656926 ID - 34656926 AB - Toluene diamine (TDA) is a major raw material in the polyurethane industry and thus, its production is highly important. TDA is obtained through the catalytic hydrogenation of 2,4-dinitrotoluene (2,4-DNT). In this study a special hydrogenation catalyst has been developed by decomposition cobalt ferrite nanoparticles onto a natural clay-oxide nanocomposite (bentonite) surface using a microwave-assisted solvothermal method. The catalyst particles were examined by TEM and X-ray diffraction. The palladium immobilized on the bentonite crystal surface was identified using an XRD and HRTEM device. The obtained catalyst possesses the advantageous property of being easily separable due to its magnetizability on a natural mineral support largely available and obtained through low carbon- and energy footprint methods. The catalyst demonstrated outstanding performance with a 2,4-DNT conversion rate exceeding 99% along with high yields and selectivity towards 2,4-TDA and all of this achieved within a short reaction time. Furthermore, the developed catalyst exhibited excellent stability, attributed to the strong interaction between the catalytically active metal and its support. Even after four cycles of reuse, the catalytic activity remained unaffected and the Pd content of the catalyst did not change, which indicates that the palladium component remained firmly attached to the magnetic support's surface. LA - English DB - MTMT ER - TY - CONF AU - Gráczer, Kitti AU - Muránszky, Gábor AU - Bánhidi, Olivér AU - Viskolcz, Béla TI - Stroncium meghatározása biológiai mintákban ICP-AES spektrometriával T2 - PhD hallgatók anyagtudományi napja XXIII PY - 2023 SP - 2 EP - 2 PG - 1 UR - https://m2.mtmt.hu/api/publication/34547737 ID - 34547737 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Hornyák-Mester, Enikő AU - Muránszky, Gábor AU - Viskolcz, Béla ED - Mentes, Dóra ED - Hornyák-Mester, Enikő ED - Fiser, Béla ED - Viskolcz, Béla ED - Varga, Miklós ED - Farkas, László ED - Jordán, Anikó TI - Low Emission Additives in Polyurethane Flexible Foams T2 - Symposium on Polyurethane Innovation 2023 - Conference Booklet PB - Miskolci Egyetem, Felsőoktatási és Ipari Együttműködési Központ CY - Miskolc-Egyetemváros SN - 9789633583081 PY - 2023 SP - 7 UR - https://m2.mtmt.hu/api/publication/34443222 ID - 34443222 N1 - Absztrakt. LA - English DB - MTMT ER - TY - CHAP AU - Hornyák-Mester, Enikő AU - Muránszky, Gábor AU - Fiser, Béla AU - Viskolcz, Béla ED - Mentes, Dóra ED - Hornyák-Mester, Enikő ED - Fiser, Béla ED - Viskolcz, Béla ED - Varga, Miklós ED - Farkas, László ED - Jordán, Anikó TI - Az Izocianát - Oldószer Kölcsönhatások Számítógépes és Kísérleti Vizsgálata T2 - Symposium on Polyurethane Innovation 2023 - Conference Booklet PB - Miskolci Egyetem, Felsőoktatási és Ipari Együttműködési Központ CY - Miskolc-Egyetemváros SN - 9789633583081 PY - 2023 SP - 129 EP - 139 PG - 11 UR - https://m2.mtmt.hu/api/publication/34442305 ID - 34442305 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Hornyák-Mester, Enikő AU - Mentes, Dóra AU - Sőrés-Tölli, Lilla Márta AU - Varga, Miklós AU - Muránszky, Gábor AU - Viskolcz, Béla TI - A VDA 278 szabvány szerinti VOC vizsgálatok nehézségei poliuretán rugalmas hab példáján keresztül bemutatva JF - Doktorandusz Almanach J2 - Doktorandusz Almanach VL - 2023 PY - 2023 IS - 1 SP - 83 EP - 90 PG - 8 SN - 2939-7294 UR - https://m2.mtmt.hu/api/publication/34442256 ID - 34442256 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Prekob, Ádám AU - Szegedi, Máté Péter AU - Muránszky, Gábor AU - Kristály, Ferenc AU - Nagy, Miklós AU - Halasi, Gyula AU - Szamosvölgyi, Ákos AU - Fiser, Béla AU - Viskolcz, Béla AU - Vanyorek, László TI - Development of Magnetizable, Nickel–Ferrite-Decorated Carbon Nanocomposites as Hydrogenation Catalyst for Aniline Synthesis JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 24 PY - 2023 IS - 24 PG - 16 SN - 1661-6596 DO - 10.3390/ijms242417547 UR - https://m2.mtmt.hu/api/publication/34441840 ID - 34441840 N1 - Institute of Chemistry, University of Miskolc, Miskolc-Egyetemváros, Miskolc, 3515, Hungary Institute of Mineralogy and Geology, University of Miskolc, Miskolc-Egyetemváros, Miskolc, 3515, Hungary Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla Square 1., Szeged, 6720, Hungary ELI-ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner Utca 3., Szeged, H-6728, Hungary Higher Education and Industrial Cooperation Centre, University of Miskolc, Miskolc-Egyetemváros, Miskolc, 3515, Hungary Ferenc Rakoczi II Transcarpathian Hungarian College of Higher Education, Beregszász, 90200, Ukraine Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, Lodz, 90-236, Poland Export Date: 31 January 2024 Correspondence Address: Vanyorek, L.; Institute of Chemistry, Miskolc-Egyetemváros, Hungary; email: laszlo.vanyorek@uni-miskolc.hu AB - Catalysts with magnetic properties can be easily recovered from the reaction medium without loss by using a magnetic field, which highly improves their applicability. To design such systems, we have successfully combined the magnetic properties of nickel ferrite nanoparticles with the positive properties of carbon-based catalyst supports. Amine-functionalized NiFe2O4 nanoparticles were deposited on the surfaces of nitrogen-doped bamboo-like carbon nanotubes (N-BCNT) and carbon nanolayers (CNL) by using a coprecipitation process. The magnetizable catalyst supports were decorated by Pd nanoparticles, and their catalytic activity was tested through the hydrogenation of nitrobenzene (NB). By using the prepared catalysts, high nitrobenzene conversion (100% for 120 min at 333 K) and a high aniline yield (99%) were achieved. The Pd/NiFe2O4-CNL catalyst was remarkable in terms of stability during the reuse tests due to the strong interaction formed between the catalytically active metal and its support (the activity was retained during four cycles of 120 min at 333 K). Furthermore, despite the long-lasting mechanical stress, no significant palladium loss (only 0.08 wt%) was detected. LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Viktória AU - Prekob, Ádám AU - Muránszky, Gábor AU - Kristály, Ferenc AU - Daróczi, Lajos AU - Harasztosi, Lajos AU - Kaleta, Zoltán AU - Viskolcz, Béla AU - Nagy, Miklós AU - Vanyorek, László TI - Amine Functionalization Leads to Enhanced Performance for Nickel- and Cobalt-Ferrite-Supported Palladium Catalysts in Nitrobenzene Hydrogenation JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 24 PY - 2023 IS - 17 PG - 14 SN - 1661-6596 DO - 10.3390/ijms241713347 UR - https://m2.mtmt.hu/api/publication/34117847 ID - 34117847 AB - Easy preparation, good yield and easy recovery are the key challenges in the development of industrial catalysts. To meet all these three criteria, we have prepared intelligent, magnetizable NiFe2O4- and CoFe2O4-supported palladium catalysts that can be easily and completely recovered from the reaction medium by magnetic separation. The fast and facile preparation was achieved by a solvothermal method followed by sonochemical-assisted decomposition of the palladium nanoparticles onto the surface of the magnetic nanoparticles. The metal–support interaction was enhanced by amine functionalization of the supports using monoethanolamine. The performance and stability of the non-functionalized and amine-functionalized NiFe2O4- and CoFe2O4-supported palladium catalysts were compared in the industrially important nitrobenzene hydrogenation reaction. All catalysts showed high catalytic activity during aniline synthesis; complete nitrobenzene conversion and high aniline yield (above 97 n/n%) and selectivity (above 98 n/n%) were achieved. However, during reuse tests, the activity of the non-functionalized catalysts decreased, as the palladium was leached from the surface of the support. On the other hand, in the case of their amine-functionalized counterparts, there was no decrease in activity, and a non-significant decrease in palladium content could be measured. Based on these results, it can be concluded that amine functionalization of transition metal ferrites may result in more effective catalysts due to the enhanced metal–carrier interaction between the support and the precious metal. LA - English DB - MTMT ER - TY - JOUR AU - Hornyák-Mester, Enikő AU - Mentes, Dóra AU - Farkas, László AU - Hatvani-Nagy, Alpár Ferencz AU - Varga, Miklós AU - Viskolcz, Béla AU - Muránszky, Gábor AU - Fiser, Béla TI - Volatile emissions of flexible polyurethane foams as a function of time JF - POLYMER DEGRADATION AND STABILITY J2 - POLYM DEGRAD STABIL VL - 216 PY - 2023 PG - 9 SN - 0141-3910 DO - 10.1016/j.polymdegradstab.2023.110507 UR - https://m2.mtmt.hu/api/publication/34113601 ID - 34113601 LA - English DB - MTMT ER - TY - GEN AU - Hornyák-Mester, Enikő AU - Mentes, Dóra AU - Hatvani-Nagy, Alpár Ferencz AU - Varga, Miklós AU - Farkas, László AU - Fiser, Béla AU - Viskolcz, Béla AU - Muránszky, Gábor TI - Evaluation of emissions from polyurethane car seat foams PY - 2023 UR - https://m2.mtmt.hu/api/publication/33826812 ID - 33826812 N1 - konferencia poszter LA - English DB - MTMT ER -