Hierarchical Zr‐MTW Zeolites Doped with Copper as Catalysts of Ethanol Conversion into 1,3‐Butadiene

The hierarchical Zr‐MTW zeolites are prepared using NH4F and HF as mineralizing agents and structure‐directed agent like Gemini‐type surfactant and studied by X‐ray diffraction (XRD), 29Si magic angle spinning nuclear magnetic resonance (29Si MAS NMR), Fourier transform infrared (FTIR) spectroscopy with pyridine, 2,6‐di‐tert‐butylpyridine and CD3CN as probe molecules. Structural characteristics and acid‐base properties of the zeolites depend on concentration of fluorine precursor in the reaction medium (a ratio of Si/F). The hierarchical Zr‐MTW zeolites (included doped with copper) have been tested in ethanol conversion into 1,3‐butadiene by Lebedev method. The symbatical dependence of 1,3‐butadiene productivity with the concentration of Lewis acidic sites determined by FTIR spectroscopy of adsorbed CD3CN is observed. 1.3‐Butadiene selectivity of 68 % with ethanol conversion of 81 % are achieved in the presence of Cu/Zr‐MTW catalyst. From ethanol to 1,3‐butadiene: The hierarchical Zr‐MTW zeolites prepared using NH4F and HF as mineralizing agents and structure‐directed agent like Gemini‐type surfactant, doped with copper are active and selective catalysts of ethanol conversion into 1,3‐butadiene. The symbatical dependence of 1,3‐butadiene productivity with the concentration of Lewis acidic sites has been observed.