02546nas a2200289   4500008004100000022001400041245011400055210006900169260000900238300001400247490000700261520158800268653001701856653002201873653001301895653002601908653002401934653002001958100001901978700001801997700002502015700001902040700001602059700002002075700003102095856013002126       2020                        eng d  a1861-472800aTriazine-based organic polymer-catalysed conversion of epoxide to cyclic carbonate under ambient CO2 pressure0 aTriazinebased organic polymercatalysed conversion of epoxide to   cJUN   a1683-16870 v153 a<p>In this work we have achieved epoxide to cyclic carbonate conversion using a metal-free polymeric catalyst under ambient CO2 pressure (1.02 atm) using a balloon setup. The triazine containing polymer (CYA-ANIS) was prepared from cyanuric chloride (CYA-Cl) and o-dianisidine (ANIS) in anhydrous DMF as solvent by refluxing under the N-2 gas environment. The presence of triazine and amine functional groups in the polymer results in the adsorption of CO2 up to 7 cc/g at 273 K. This inspired us to utilize the polymer for the conversion of a series of functionalised epoxides into their corresponding cyclic carbonates in the presence of tetrabutyl ammonium iodide (TBAI) as co-catalyst. The product has wide range of applications like solvent in lithium ion battery, precursor for polycarbonate, etc. The catalyst was efficient for the conversion of different mono and di-epoxides into their corresponding cyclic carbonates under atmospheric pressure in the presence of TBAI as co-catalyst. The study indicates that epoxide attached with electron withdrawing groups (like, CH2Cl, glycidyl ether, etc.) displayed better conversion compared to simple alkane chain attached epoxides. This is mainly due to the stabilization of electron rich intermediates produced during the reaction (e. g. epoxide ring opening or CO2 incorporation into the halo-alkoxide anion). This catalyst mixture was capable to maintain its reactivity up to five cycles without losing its activity. Post catalytic characterization clearly supports the heterogeneous and recyclable nature of the catalyst.</p>
10aCO2 fixation10acyclic carbonates10aepoxides10aHeterogeneouscatalyst10ametal free catalyst10aTriazinepolymer1 aBiswas, Tanmoy1 aHalder, Arjun1 aPaliwal, Khusboo, S.1 aMitra, Antarip1 aTudu, Gouri1 aBanerjee, Rahul1 aMahalingam, Venkataramanan  uhttps://library.ncl.res.in/content/triazine-based-organic-polymer-catalysed-conversion-epoxide-cyclic-carbonate-under-ambient02018nas a2200229   4500008004100000022001400041245013100055210006900186260000800255490000700263520115500270653002201425653002101447653002901468653003201497653002301529653002401552653003201576100002401608700002601632856013001658       2025                        eng d  a1439-423500aGraphitic carbon nitride supported boron quantum dots: a transition metal free alternative for di-nitrogen to ammonia reaction0 aGraphitic carbon nitride supported boron quantum dots a transiti  cMAR0 v263 a<p>
	Presently, a sustainable electrochemical Nitrogen Reduction Reaction (NRR) has been essentially found to be viable on transition metal-based catalysts. However, being cost-effective and non-corrosive, metal-free catalysts present an ideal solution for a sustainable world. Herein, through a DFT-based study, we demonstrate metal-free NRR catalysts, boron quantum dots with 13 atoms as a case study and their chemically modified counterparts when anchored on graphitic carbon nitride (g-C3N4) surface. The best catalyst among the studied, a silicon-doped boron quantum dot with a cagelike structure, is found to favour the dinitrogen to ammonia reaction pathway with a low liming potential and potential rate-determining step (PDS) of -0.11 V and 0.27 eV, respectively. The present work demonstrates as to how boron quantum dots, which are reported to be experimentally synthesised, can be exploited for ammonia synthesis when supported on the surface. These catalysts effectively suppress the HER, thus establishing its suitability as an ideal catalyst. The work also represents a futuristic pathway towards a metal-free catalyst for NRR.</p>
10aBoron quantum dot10aElectro-catalyst10aGraphitic carbon nitride10ahydrogen evolution reaction10aLimiting potential10ametal free catalyst10aNitrogen Reduction Reaction1 aSamudre, Nikhil, S.1 aKrishnamurty, Sailaja  uhttps://library.ncl.res.in/content/graphitic-carbon-nitride-supported-boron-quantum-dots-transition-metal-free-alternative-di