02040nas a2200265   4500008004100000022001400041245010000055210006900155260000800224300001200232490000700244520119000251653001401441653001001455653002901465653002001494653003501514653001001549100002101559700001701580700001801597700001601615700002201631856012101653       2019                        eng d  a1600-577500aOperando X-ray absorption spectroscopy study of the Fischer-Tropsch reaction with a Co catalyst0 aOperando Xray absorption spectroscopy study of the FischerTropsc  cJAN  a137-1440 v263 a<p>This article describes the setting up of a facility on the energy-scanning EXAFS beamline (BL-09) at RRCAT, Indore, India, for operando studies of structure-activity correlation during a catalytic reaction. The setup was tested by operando X-ray absorption spectroscopy (XAS) studies performed on a Co-based catalyst during the Fischer-Tropsch reaction to obtain information regarding structural changes in the catalyst during the reaction. Simultaneous gas chromatography (GC) measurements during the reaction facilitate monitoring of the product gases, which in turn gives information regarding the activity of the catalyst. The combination of XAS and GC techniques was used to correlate the structural changes with the activity of the catalyst at different reaction temperatures. The oxide catalyst was reduced to the metallic phase by heating at 400 degrees C for 5h under H-2 at ambient pressure and subsequently the catalytic reaction was studied at four different temperatures of 240, 260, 280 and 320 degrees C. The catalyst was studied for 10h at 320 degrees C and an attempt has been made to understand the process of its deactivation from the XANES and EXAFS results.</p>10acatalysis10aEXAFS10aFischer-Tropsch reaction10ain situ studies10astructure-activity correlation10aXANES1 aNayak, Chandrani1 aJain, Preeti1 aVinod, C., P.1 aJha, S., N.1 aBhattacharyya, D.  uhttps://library.ncl.res.in/content/operando-x-ray-absorption-spectroscopy-study-fischer-tropsch-reaction-co-catalyst02511nas a2200289   4500008004100000245010800041210006900149260000900218300001600227490000600243520146800249653003101717653001601748653003301764653004401797653003501841100001801876700002401894700003001918700002901948700002401977700002602001700002202027700001902049700002202068856013102090       2023                        eng d00aShape-controlled MoO3/MnO x nanocatalyst for the selective synthesis of 2-phenylquinoxaline drug motifs0 aShapecontrolled MoO3MnO x nanocatalyst for the selective synthes  cDEC   a23442-234530 v63 a<p>
	We have developed a highly effective shape-controlled MoO3/MnOx nanocatalyst for the selective synthesis of 2-phenylquinoxaline drug motifs at room temperature without any external oxidant. Electron microscopy images reveal that the MnOx material contains rod-shaped particles (length: 500-1000 nm and width: 150-200 nm) and the MoO3 species are uniformly dispersed in the MoO3/MnOx material. The MoO3/MnOx nanocatalyst calcined at 500 degrees C (MoO3/MnOx-5) contains abundant strong acid sites and an optimum ratio of Mn4+/Mn3+, which are responsible for the C-N cross-coupling reaction between 2-phenylethylamine and o-phenylenediamine, giving higher yields (&gt;96%) of 2-phenylquinoxaline at mild conditions. The broad scope of this catalytic strategy at room temperature and without an external oxidant was confirmed by achieving &gt;90% yields of functional 2-phenylquinoxalines from C-N cross-coupling of various o-phenylenediamines and 2-phenylethylamines. The outstanding reusability efficiency of the MoO3/MnOx-5 nanocatalyst up to five cycles without the need for a regeneration step as well as the effective scalability highlighted the practicability of the MoO3/MnOx-based catalytic protocol for carbon-heteroatom coupling reactions at room temperature and without an external oxidant. Using computational studies, the possible reasons for the selective synthesis of 2-phenylquinoxaline over the MoO3/MnOx-5 nanocatalyst were elucidated.</p>
10acascade C-N cross-coupling10aDFT studies10aroom temperature andopen air10ashape-controlled MoO3/MnOx nanocatalyst10astructure-activity correlation1 aSingh, Nittan1 aPutla, Suresh, Babu1 aSingh, Chandrodai, Pratap1 aKalbande, Pavan, Narayan1 aChoudhary, Priyanka1 aKrishnamurty, Sailaja1 aKrishnan, Venkata1 aBhatte, Kushal1 aSudarsanam, Putla  uhttps://library.ncl.res.in/content/shape-controlled-moo3mno-x-nanocatalyst-selective-synthesis-2-phenylquinoxaline-drug-motifs