02785nas a2200289   4500008004100000022001400041245018600055210006900241260006100310300001000371490000800381520172800389653001602117653001102133653001302144653002202157653002402179100002902203700002102232700002002253700002102273700001302294700001702307700001802324700002802342856012502370       2008                        eng d  a1011-372X00aSelective oxidation of ethane over Mo-V-Al-O oxide catalysts: insight to the factors affecting the selectivity of ethylene and acetic acid and structure-activity correlation studies0 aSelective oxidation of ethane over MoVAlO oxide catalysts insigh  a233 SPRING STREET, NEW YORK, NY 10013 USAbSPRINGERcFEB  a39-510 v1213 a<p>Catalysts of general formula, MoVAlOx were prepared with the initial elemental composition of 1:0.34:0.167 (Mo:V:Al) at a pH value in the range of 1-4. The elemental analysis showed that the final composition of the catalysts is pH dependant. The performance of the catalysts was tested for selective oxidation of ethane to give ethylene and acetic acid. While all of them were active for ethane oxidation with a moderate conversion, the catalyst prepared at pH 2 showed a highest activity with 23% ethane conversion and a combined selectivity of 80.6% to ethylene and acetic acid. The catalyst prepared at pH 4 was least selective to ethylene and acetic acid. Various techniques like powder XRD, SEM, Raman, UV-Vis and EPR were used to characterize the catalysts and to identify the active phases responsible for the selective oxidation of ethane. The powder XRD data showed that the catalysts prepared at pH 1 and 2 contain mainly of MoO3 and MoV2O8 along with traces of Mo4O11. The amount of MoO3 was slightly higher in the catalyst prepared at pH 1. However, the catalyst prepared at pH 3 contains mainly of MoV2O8 with no trace of MoO3. The catalyst prepared at pH 4 showed V2O5 as the major phase along with MoVAlO4 phase. The Raman data corroborated the XRD results. EPR and UV-Vis studies indicated the presence of traces of V-4 in pH 1 and 2 catalysts and significant amount of Mo5+ in all the catalysts. Thus, the high activity and selectivity to ethylene and acetic acid are attributed to the presence of MoV2O8 phase and other reduced species like Mo4O11 phase supported on MoO3. The presence of V and Mo ions in a partially reduced form seems to play a crucial role in the selective oxidation of ethane.</p>10aAcetic acid10aethane10aEthylene10amixed metal oxide10aSelective oxidation1 aSankaranarayanan, T., M.1 aIngle, Rohit, H.1 aGaikwad, T., B.1 aLokhande, S., K.1 aRaja, T.1 aDevi, R., N.1 aRamaswamy, V.1 aManikandan, Palanichamy  uhttps://library.ncl.res.in/content/selective-oxidation-ethane-over-mo-v-al-o-oxide-catalysts-insight-factors-affecting-001327nas a2200181   4500008004100000245007000041210006800111260000800179300001200187490000800199520078500207100001300992700002901005700002301034700001501057700001901072856005401091       2017                        eng d00aHydrogenolysis of sorbitol over Ni, Pt and Ru supported on SBA-150 aHydrogenolysis of sorbitol over Ni Pt and Ru supported on SBA15  cFEB  a226-2310 v56 3 aHydrogenolysis of sorbitol (15% aqueous solution) has been carried out in a batch reactor over Ni (6 wt%), Pt (1 wt%) and Ru (1 wt%) supported on SBA-15 and carbon coated SBA-15 (SBA-15(C)). For comparison, the three metals have also been supported on activated carbon (AC). The catalysts are characterized by XRD, N-2 and H-2 adsorption measurements. Addition of Ca(OH)(2) to the reaction mixture increases conversion and selectivity for the dihydroxy compounds, 1,2-propanediol (PD) and ethylene glycol (EG). Based on yield of dihydric alcohols (PD+EG), the performance of the catalysts at 220 degrees C and 60 bar in the presence of Ca(OH)(2) is in the order: Ru-AC similar to Ru-SBA-15(C) > Ru-SBA-15 similar to Ni-SBA-15, the yields being 40, 39, 31 and 29 wt%, respectively.1 aBanu, M.1 aSankaranarayanan, T., M.1 aVenuvanalingam, P.1 aMagesh, G.1 aSivasanker, S.  uhttp://nopr.niscair.res.in/handle/123456789/40903