Synthesis, characterization and catalytic behavior of SnTf/MCM-41 and SnTf/UVM-7 as new green catalysts for etherification reactions
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Strong Lewis acid SnTf-MCM-41 and SnTf-UVM-7 catalysts with unimodal and bimodal pore systems were prepared in a two-step synthesis in which the triflic acid (OTf) was incorporated into previously synthesized mesoporous tin-containing silicas. The Sn incorporation inside the pore walls was carried out through the Atrane method. The SnTf-UVM-7 catalysts were prepared by aggregating nanometric mesoporous particles defining a hierarchic textural-type additional pore system. Catalysts with different Si/Sn ratios in the range 21.8–50.8 for SnTf-MCM-41 and 18.4 for SnTf-UVM-7 were found to be efficient catalysts for the etherification of primary alcohols to symmetrical long chain ethers and the selective etherification of ethylene glycol with 1-octanol to nonionic surfactants structures. The processes are green, environmentally safe, and heterogeneous.
KeywordsTriflate Glycol Ether Lewis Acid Catalyst Selective Etherification Triflic Acid
The authors thank the MEC (CTQ2006-15456-C04-03/BQU) for financial support. Jamal El Haskouri thanks the Ministry of Science and Technology from Spain for a Ramon & Cajal contract. We also thank the CNCSIS (Grant 44GR/2008, COD CNCSIS 1071, and PNCDI II 40/2007) for the financial support.
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