Synthesis and characterization of bentonite based zinc complexes

Abstract

In chemical reactions, the use of environmentally friendly catalysts obtained by transporting transition metals on solid or polymer carrier materials has become quite common recently. Studies in which zinc complexes are used as homogeneous and heterogeneous catalysts are frequently encountered in the literature. In addition to many advantages of homogeneous catalysts, disadvantages include difficulty separating from the reaction medium, recycling, and limited chemical-thermal stability. Solving problems can be solved by using solid catalyst sup-port materials and transferring the active ingredients to these materials. Therefore, catalysts prepared by transporting transition metal complexes onto solid supports have become interesting for researchers. Natural or processed clays can be used as catalysts or catalyst carriers and have many uses due to their cheapness and abundance. In this study, natural Enez/Edirne bentonite was acid-activated (HB) and converted to organo-clay (HB/CTAB) with hexadecyl-trimethylammonium bromide (CTAB). Then, heterogeneous catalysts were prepared by direct transport of the synthesized [Zn(acac)2H2O] or [Zn(p-H2NC6H4COO)2]1.5H2O complexes onto modified clays separately. The catalysts have been characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, surface scanning electron microscope, and Brunauer-Emmett-Teller specific surface analysis methods.

Keywords

• bentonite
• catalyst
• organo-clay
• zinc complex
• organo-kil
• çinko kompleks
• katalizör
• bentonit