01711nas a2200253   4500008004100000022001400041245009700055210006900152260005700221300001200278490000800290520085800298653001201156653001501168653001301183653002001196653001101216100002201227700001801249700001801267700002701285700002201312856012301334       2009                        eng d  a1011-372X00aSynthesis of N-methylaniline by aniline alkylation with methanol over Sn-MFI molecular sieve0 aSynthesis of Nmethylaniline by aniline alkylation with methanol   a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcNOV  a175-1840 v1333 a<p>Sn-MFI molecular sieves (Tin silicalite-1) with SiO(2)/SnO(2) molar ratio of 50-150 were synthesized and characterized. Elemental analysis, XRD and DRUV-vis confirmed that prepared samples were of MFI zeolite structure and Sn was incorporated in MFI framework. Vapor phase methylation of aniline over Sn-MFI was systematically studied and optimizations of process parameters were carried out. Sn-MFI (SiO(2)/SnO(2) = 50) was found to be optimum catalyst with 55% aniline conversion and 60% N-methylaniline selectivity. At lower space velocity (higher contact time) of 1 h(-1), aniline conversion was found to be increased to 71% with reduction in N-methylaniline selectivity to 39% and increased in N,N-dimethylaniline selectivity to 58%. The reaction follows first order kinetics with respect to aniline having activation energy of 7.3 kcal/mol.</p>10aAniline10aLewis acid10aMethanol10aN-methylaniline10aSn-MFI1 aNiphadkar, P., S.1 aJoshi, P., N.1 aGurav, H., R.1 aDeshpande, Suvarna, S.1 aBokade, Vijay, V.  uhttps://library.ncl.res.in/content/synthesis-n-methylaniline-aniline-alkylation-methanol-over-sn-mfi-molecular-sieve-002427nas a2200241   4500008004100000022001400041245013100055210006900186260006900255300001200324490000800336520150300344653002001847653002301867653002601890653001101916100002801927700002701955700002601982700002202008700002502030856013002055       2009                        eng d  a0254-058400aTin-silicalite-1: synthesis by dry gel conversion, characterization and catalytic performance in phenol hydroxylation reaction0 aTinsilicalite1 synthesis by dry gel conversion characterization   aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR  a344-3490 v1143 a<p>Tin-silicalite-1 (Sn-MFI) has been successfully synthesized by dry gel conversion (DGC) method. The influence of various synthesis parameters such as crystallization time, temperature, water content at the bottom of autoclave, molar ratios of (TPA)(2)O/SiO(2) and SiO(2)/SnO(2) in dry gel on the crystallization kinetics and physico-chemical properties of Sn-MFI materials has been investigated. Powder-X-ray diffraction (XRD),XPS,AAS, DRUV-vis and SEM techniques were employed as characterization tools. Time-dependent studies revealed that, the progressive crystallization of Sn-MFI depend not only on the synthesis time but also on the other various synthesis parameters. Increase in the crystallization temperature, water content at bottom of autoclave (TPA)(2)O/SiO(2) and SiO(2)/SnO(2) molar ratios in dry gel resulted in the lowering of overall crystallization period. A good correspondence between the chemical composition of the surface and the bulk indicated the uniform distribution of Sn(4+) ions. The presence of these ions in tetrahedral coordination has been indicated by DRUV-vis spectral studies. Although, not better but comparable activity has been shown by Sn-MFI prepared by dry gel conversion method with Sn-MFI prepared by conventional hydrothermal crystallization method in the hydroxylation of phenol reaction. Increase in concentration of isolated Sn(4+) ions led to increase in phenol conversion and H(2)O(2) efficiency. (c) 2008 Elsevier B.V. All rights reserved.</p>10acrystallisation10aDry gel conversion10amicroporous materials10aSn-MFI1 aNiphadkar, Prashant, S.1 aKotwal, Mehejabeen, S.1 aDeshpande, Shilpa, S.1 aBokade, Vijay, V.1 aJoshi, Praphulla, N.  uhttps://library.ncl.res.in/content/tin-silicalite-1-synthesis-dry-gel-conversion-characterization-and-catalytic-performance-0