03202nas a2200265   4500008004100000022001400041245017200055210006900227260000800296300001400304490000700318520224200325653002802567653001302595653001902608653002002627653002302647100001902670700002302689700001802712700002102730700002902751700002602780856013002806       2020                        eng d  a2155-543500aControlling and stabilization of Ru nanoparticles by tuning the nitrogen content of the support for enhanced H-2 production through aqueous-phase reforming of glycerol0 aControlling and stabilization of Ru nanoparticles by tuning the   cFEB  a2489-25070 v103 a<p>The stable activity of catalysts is an important issue in catalysis, particularly aqueous-phase reforming (APR) of renewable oxygenates, of biomass origin, to get H-2. Sintering of metal nanoparticles on supports affects catalyst stability. To alleviate this problem, a series of highly stable Ru-supported catalysts with controlled metal nanoparticle sizes have been prepared via the easy incipient wetness impregnation method. These catalysts were used for APR of glycerol to produce H-2. Nitrogen-doped mesoporous carbons (NMCs) were utlized as supports and found to have a strong influence on the catalytic performance of the catalysts. Incorporation of nitrogen in the carbon framework significantly enhanced the catalytic activity compared to Ru catalysts on nitrogen-free supports. Notably, the catalyst (5 wt % Ru-NMC-3) with optimal N content (10.9 wt %) demonstrated improved stability and H-2 selectivity, which are better than those of many state-of-the-art catalysts. Nitrogen in the carbon framework has a dual relationship with the activity of the catalyst: (i) it creates basic environment over the catalysts support and (ii) it acts as an anchoring site for metal nanoparticles. Anchoring of metal nanoparticles has helped to curb their sintering, thus leading to better stability of the catalysts under APR reaction conditions. Various characterization techniques were employed to understand the nature of active catalytic sites responsible for higher H-2 production while minimizing CO formation. In situ CO-FTIR studies showed that the higher catalytic activity of 5 wt % Ru-NMC-3 catalyst was attributed to the enhanced WGS activity over this catalyst. Density functional theory calculations were performed to understand the stabilization of metal nanoparticles by different types of N present on the support and provide insights into the prefered sites of glycerol adsorption on the NMC support. Since S wt % Ru-NMC-3 was the relatively best catalyst, it was selected for the preparation of bimetallic catalysts. Accordingly, addition of Pt to this system helped to increase the stability of the catalyst. This bimetallic catalyst may, therefore, find application for wide use in APR of biomass oxygenates.</p>
10aaqueous-phase reforming10aGlycerol10aH-2 production10aRu/NMC catalyst10asynergistic effect1 aGogoi, Pranjal1 aKanna, Narsimharao1 aBegum, Pakiza1 aDeka, Ramesh, C.1 aSatyanarayana, C., V. V.1 aRaja, Thirumalaiswamy  uhttp://library.ncl.res.in/content/controlling-and-stabilization-ru-nanoparticles-tuning-nitrogen-content-support-enhanced-h-202492nas a2200325   4500008004100000022001400041245010800055210006900163260000900232300000800241490000800249520144900257653001301706653002001719653002001739653002901759100001701788700001701805700001901822700002001841700001801861700002601879700002101905700002101926700001801947700002401965700002601989700002302015856012802038       2025                        eng d  a0974-362600aFacile and eco-friendly synthesis of Mn2O3 nanoparticles via microwave-assisted glycerol-thermal method0 aFacile and ecofriendly synthesis of Mn2O3 nanoparticles via micr  cNOV   a1020 v1373 a<p>
	Microwave-assisted efficient synthesis of nanosized manganese oxide (Mn2O3) is reported using glycerol and manganese acetate. Glycerol in this reported methodology acts as an efficient solvent for this nanomaterial synthesis under microwave radiation. This reported method enables the synthesis of nanosized Mn2O3 without further use of additives, stabilizers, and bases other than glycerol and manganese precursor. Glycerol is a renewable biomaterial derived nonvolatile and nontoxic, safe solvent. It has a high boiling point and dielectric constant, which makes it an ideal solvent for microwave synthesis. The synthesized nanosized Mn2O3 was analyzed by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. We examined the catalytic properties of as-synthesized Mn2O3 for cinnamyl alcohol oxidation to cinnamaldehyde. In this oxidation activity experiment, nanosized Mn2O3 exhibits good conversion and selectivity towards the desired product. We also made an attempt to understand the probable mechanism of nanomaterial formation and found some conclusive evidence to support it. This research methodology is facile, energy efficient, and involves minimum chemicals for synthesis. It makes this reported methodology not only economically attractive but also environmentally friendly, which aligns well with green chemistry principles.</p>
10aGlycerol10agreen chemistry10aNanosized Mn2O310ananostructured catalysis1 aYadav, Akash1 aJha, Ratnesh1 aBhatkar, Akash1 aGehlot, Bhavika1 aKamble, Aditi1 aManikandan, Marimuthu1 aBhosale, Hritvik1 aVaishnav, Vishal1 aRathod, Rutik1 aUmbarkar, Shubhangi1 aRaja, Thirumalaiswamy1 aBhatte, Kushal, D.  uhttp://library.ncl.res.in/content/facile-and-eco-friendly-synthesis-mn2o3-nanoparticles-microwave-assisted-glycerol-thermal