02048nas a2200265   4500008004100000022001400041245010000055210006900155260007300224300001000297490000800307520110900315653001101424653002301435653002401458653002501482653002801507100001901535700002101554700001501575700002101590700001701611700002801628856012601656       2008                        eng d  a1381-116900aNon-phosgene route for the synthesis of methyl phenyl carbamate using ordered AISBA-15 catalyst0 aNonphosgene route for the synthesis of methyl phenyl carbamate u  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a29-330 v2953 a<p>Methyl phenyl carbamate (MPC) has been synthesized Under liquid phase conditions from dimethyl carbonate and aniline by using mesoporous AISBA-15 catalyst. The catalyst with different Si/Al ratio was synthesized by isomorphous Substitution of aluminium into the framework of siliceous SBA-15. The structural integrity of the catalyst system was diagnosed with the help of various characterization techniques Such as X-ray diffraction, Surface analysis, and the acidity measurement has been done by TPD using ammonia as probe molecule. AISBA-15 (Si/Al = 10) exhibited highest catalytic activity in the synthesis of MPC under the reaction Conditions Studied. The effect of parameters Such as molar ratio of reactants, catalyst concentration. reaction temperature and time on the conversion of aniline was investigated. The results demonstrated that an aniline conversion of 99% and MPC selectivity of 71% were achieved when the reaction was carried out at 100 C, DMC to aniline mole ratio of 10 with 5% of catalyst (wt% of total reaction mixture) for 3 h. (c) 2008 Elsevier B.V. All rights reserved.</p>10aamines10aDimethyl carbonate10aMesoporous AISBA-1510aMethoxycarbonylation10aMethyl phenyl carbamate1 aLucas, Nishita1 aAmrute, Amol, P.1 aPalraj, K.1 aShanbhag, G., V.1 aVinu, Ajayan1 aHalligudi, Shivaraj, B.  uhttps://library.ncl.res.in/content/non-phosgene-route-synthesis-methyl-phenyl-carbamate-using-ordered-aisba-15-catalyst-002735nas a2200253   4500008004100000022001400041245013200055210006900187260007700256300001200333490000700345520176600352100002402118700001502142700003502157700002002192700002602212700002302238700002602261700002102287700002802308700001702336856012802353       2008                        eng d  a1616-301X00aNovel three dimensional cubic Fm3m mesoporous aluminosilicates with tailored cage type pore structure and high aluminum content0 aNovel three dimensional cubic Fm3m mesoporous aluminosilicates w  aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB  a640-6510 v183 a<p>Novel three dimensional cubic Fm3m mesoporous aluminosilicates (AIKIT-5) with very high structural order and unprecedented loadings of Al in the silica framework have been successfully prepared for the first time by using non ionic surfactant as a template in a highly acidic medium. The obtained materials have been unambiguously characterized in detail by several sophisticated techniques such as XRD, N, adsorption, HRTEM, HRSEM, EDS, elemental mapping, Al-27 MAS NMR, and NH3-TPD. We also demonstrate that the nature, and the amount of Al incorporation in the silica framework can easily be controlled by simply varying the n(H2O)/n(HCl) and the n(Si)/n(Al), ratios, and the Al sources in the synthesis gel. Among the Al sources examined, the Al isopropoxide (AiPr) is superior over other Al sources. Al-27 MAS NMR results reveal that the amount of tetrahedral Al in the framework can be controlled by simply adjusting the nSi/nAl ratio in the synthesis gel, which increases with increasing the Al incorporation. One of the interesting findings in the work is the increase of the specific surface area, specific pore volume and the pore diameter of AIKIT-5 with increasing the Al incorporation in the silica framework (up to n(Si)/n(Al), ratio of 10) while retaining the well-ordered three dimensional cage type porous structure, and the mechanism for the unusual behavior has been discussed in detail. Finally, the acidity and the catalytic activity in the acetylation of veratrole of the AIKIT-5 catalysts have been studied and the results have been compared with the several zeolites catalysts. Among the catalysts examined, AIKIT-5(10) is found to be superior over the zeolites catalysts such as mordenite, zeolite H-Y, zeolite H-beta, and ZSM-5.</p>1 aSrinivasu, Pavuluri1 aAlam, Sher1 aBalasubramanian, Veerappan, V.1 aVelmathi, Sivan1 aSawant, Dhanashri, P.1 aBoehlmann, Winfred1 aMirajkar, Subhash, P.1 aAriga, Katsuhiko1 aHalligudi, Shivappa, B.1 aVinu, Ajayan  uhttps://library.ncl.res.in/content/novel-three-dimensional-cubic-fm3m-mesoporous-aluminosilicates-tailored-cage-type-pore-0