02066nas a2200229   4500008004100000022001400041245014400055210006900199260007300268300001000341490000800351520116400359653001801523653002801541653002001569653003001589653003001619100002001649700001901669700001801688856013001706       2006                        eng d  a0926-860X00aOrganosilanesulfonic acid-functionalized Zr-TMS catalysts: synthesis, characterization and catalytic applications in condensation reactions0 aOrganosilanesulfonic acidfunctionalized ZrTMS catalysts synthesi  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a79-900 v3103 a<p>Organosilanesulfonic acid (-Si-R3S-R4SO3H, OSA)-functionalized mesoporous Zr-TMS (Zr-TMS-Si-R3S-R4SO3H, Zr-TMS-OSA) was synthesized either by post-synthetic modification of Zr-TMS (zirconia-based transition metal oxide mesoporous molecular sieves) with 3-mercaptopropyltrimethoxysilane (3-MPTS) and further with 1,4-butanesultone (1,4-BS) or by in situ one-pot synthesis procedure. A number of physico-chemical characterization techniques have been used to show that the organosilanesulfonic acid groups were anchored on to the walls of Zr-TMS. MCM-41-Si-R3S-R4SO3H-20 (MCM-41-OSA-20) was also prepared by post-synthesis procedure for comparison. Physico-chemical properties of in situ made A-Zr-OSA-20, Zr-TMS-SO3H-20 and MCM-41-OSA-20 were compared with Zr-TMS-OSA catalysts. The catalytic activity of the materials was tested in liquid phase condensation of aniline with p-formaldehyde to 4,4'-diaminodiphenylmethane (4,4'-DADPM). Results showed that Zr-TMS-OSA catalysts were more active than Zr-TMS-SO3H-20, MCM-41-OSA-20 and A-Zr-OSA-20 and more selective than Zr-TMS-SO3H-20 and A-Zr-OSA-20 catalysts. (C) 2006 Elsevier B.V. All rights reserved.</p>10aAcid catalyst10acondensation of aniline10amesoporous ZrO210aorganic functionalization10aorganosilanesulfonic acid1 aChidambaram, M.1 aVenkatesan, C.1 aSingh, A., P.  uhttps://library.ncl.res.in/content/organosilanesulfonic-acid-functionalized-zr-tms-catalysts-synthesis-characterization-and-0