Combustion method combined with sonochemical step for synthesis of maghemite-supported catalysts for the hydrogenation of 2,4-dinitrotoluene

Hajdu, Viktória; Muránszky, Gábor; Hashimoto, Masahiro; Kristály, Ferenc; Szőri, Milán; Fiser, Béla; Viskolcz, Béla; Vanyorek, László

doi:10.1016/j.catcom.2021.106342

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…Their strong catalytic abilities are used, for example, in direct methanol fuel cells (DMFCs) for the conversion of fuel at the anode and the reduction of oxygen at the cathode [ 9 ]. The extremely wide range of Pt-NP applications also includes coatings [ 10 ], textiles [ 11 ], nanofibers [ 12 ], plastics [ 13 ], magnetic nanopowders [ 14 ], multifunctional membranes [ 15 ], and cancer therapy [ 16 , 17 ]. Moreover, Pt-NPs are largely used in electronics manufacturing for the fabrication of internal electrodes of multilayer ceramic capacitors [ 1 , 18 ] or as conductor paste in conductive thick-film-integrated circuits [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

The Water-Based Synthesis of Platinum Nanoparticles Using KrF Excimer Laser Ablation

et al. 2022

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Our work presents, for the first time, a comprehensive study of the synthesis of fully metallic platinum nanoparticles (Pt-NPs) involving the ablation process in double distilled water using a KrF excimer laser. To obtain detailed information on Pt-NP morphology and optical properties, prepared colloids were characterized using High Resolution Scanning Transmission Electron Microscopy (HR-STEM) with advanced capabilities for Energy Dispersive X-ray Analysis (EDX), UV/Vis optical spectroscopy, and Direct Analysis in Real Time—Mass Spectrometry (DART-MS). The influence of the applied laser fluence and laser repetition rate (RR) values on the characteristics of the obtained Pt-NPs and the ablation process, respectively, were also analyzed. Spherical and spherical-like nanoparticles exhibiting aggregation were produced. The Pt-NP mean size values were between 2.2 ± 1.2 nm and 4.0 ± 1.0 nm, while their interplanar distance measurements showed a face-centered cubic (FFC) Pt lattice (111), as revealed by HR–STEM measurements, for all investigated samples. The smallest mean size of 2.2 nm of the Pt-NPs was obtained using a 2.3 J cm−2 laser fluence at a 10 Hz RR, and the narrowest size distribution of the NPs was obtained with a 2.3 J cm−2 laser fluence at a 40 Hz RR. A linear dependence of the Pt-NP diameters versus the laser repetition rate was found at a constant fluence of 2.3 J cm−2. The proposed eco-friendly synthesis route of Pt-NPs, because of its relative simplicity, has the potential for use in industrial production.

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Section: Introductionmentioning

confidence: 99%

The Water-Based Synthesis of Platinum Nanoparticles Using KrF Excimer Laser Ablation

et al. 2022

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“…The palladium content of the fresh catalyst was 1.61 wt%, which did not show a significant decrease after multiple cycles (1.60 wt%). Based on the results of the reuse tests and ICP measurements, it can be stated that the developed catalyst is stable, owing to the strong interaction between the noble metal and its support 11 – 14 , 21 , 36 .…”

Section: Resultsmentioning

confidence: 99%

“…The developed Pd/CoFe 2 O 4 bentonite-based catalyst was compared to 14 other systems 11 , 12 , 12 , 13 , 36 applied in DNT hydrogenation by using the MIRA21 model 14 . It was found that the bentonite-based catalyst has a MIRA21 number of 11.09, which is just slightly lower than the best (11.50) and ranks as 8th within the list of 15 catalysts (see Supplementary Information).…”

Section: Resultsmentioning

confidence: 99%

Bentonite as eco-friendly natural mineral support for Pd/CoFe2O4 catalyst applied in toluene diamine synthesis

Hatvani-Nagy,

Hajdu,

Ilosvai

et al. 2024

Sci Rep

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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.

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Micropacked‐bed Reactor for Continuous Hydrogenation of Aromatic Dinitro Compounds

Yang¹,

Liu²,

Ming³

et al. 2022

ChemistrySelect

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Due to the intricacy aromatic dinitro compound hydrogenation processes, it is difficult to attain high conversion and selectivity using merely modified catalysts in batch reactors. The micropacked-bed reactor (μPBR) offers efficient heat and mass transfer, a precise and controllable reaction process, and a high level of safety. In this work, the hydrogenation of 2,4dinitroanisole was selected as the model reaction, and a variety of catalysts were utilized in the continuous flow system based on μPBR for hydrogenation of 2,4-dinitroanisole. During 960 minutes of operation, the synthesis of 2,4-diaminoanisole was carried out using a Pd (OH) 2 /C catalyst and the optimal process condition, yielding 100 % conversion, 99.5 % selectivity, and the favorable durability. For the hydrogenation of relevant aromatic dinitro compounds, the continuous flow system demonstrates exceptional performance.

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Combustion method combined with sonochemical step for synthesis of maghemite-supported catalysts for the hydrogenation of 2,4-dinitrotoluene

Cited by 6 publications

References 31 publications

The Water-Based Synthesis of Platinum Nanoparticles Using KrF Excimer Laser Ablation

The Water-Based Synthesis of Platinum Nanoparticles Using KrF Excimer Laser Ablation

Bentonite as eco-friendly natural mineral support for Pd/CoFe2O4 catalyst applied in toluene diamine synthesis

Micropacked‐bed Reactor for Continuous Hydrogenation of Aromatic Dinitro Compounds

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