(632b) Fast and Continuous Flow Hydrothermal Synthesis of MoVNbTeOx Mixed Metal Oxides in Micro Droplet — Large-Scale Accessibility of MoVNbTeOx Catalysts

Oxidative dehydrogenation of ethane to produce ethylene is a promising pathway to convert underutilized ethane resources from shale gases into value-added chemical building blocks. MoVNbTeO_x catalyst is the most active catalyst in the ODHE process, which is usually prepared by hydrothermal method and sensitive to the synthesis procedure. The synthesis of MoVNbTeO_x oxide is remain time-consuming, which limits its accessibility on a large scale. In this work, the synthesis parameters of MoVNbTeO_x catalysts were optimized and screened by laboratory scale batch autoclave reactor and tubular reactor e.g., precursors compositions, synthesis temperatures, and time durations. The optimized synthesis parameters were adopted for the continuous flow hydrothermal synthesis (CFHTS) of MoVNbTeO_x by a microtubular coil reactor in a short time duration. The gas generated divides the liquid inside the tube into droplets, intensifying the internal mass and heat transfer processes and allowing for catalysts with excellent catalytic performance and reproducibility. Compare with the catalysts synthesized by conventional laboratory-scale autoclave reactors, the CFHTS method with higher synthesis temperature can significantly reduce the synthesis time, which can reduce the synthesis time duration from ~ 48 h to 10 min.