Mo-V-Be Catalyst for Ethane Dehydrogenation

The patent employs a composite catalyst system containing molybdenum, vanadium, and beryllium in specific molar ratios (Mo:V = 1:0.25 to 1:0.65, Mo:Be = 1:0.25 to 1:0.85). This multi-element composite structure creates synergistic effects that enable effective ethane conversion at lower temperatures (300-400°C for 35% conversion) while maintaining high ethylene selectivity (65-99%), resolving the contradiction between temperature requirements and selectivity performance.

The patent systematically optimizes the molar ratios of catalyst components, specifically varying Mo:V from 1:0.25 to 1:0.65 and Mo:Be from 1:0.25 to 1:0.85, to achieve the desired balance between conversion temperature and ethylene selectivity. This parameter optimization allows the catalyst to operate effectively in the 300-400°C range while maintaining high selectivity, addressing the technical contradiction through precise compositional control.

The patent establishes specific molar ratio ranges (Mo:V = 1:0.25 to 1:0.65, Mo:Be = 1:0.25 to 1:0.85) that simultaneously achieve high ethylene selectivity (65-99%) and define an optimal conversion temperature window (300-400°C for 35% conversion). These parameter specifications ensure that the catalyst maintains both high selectivity and operates within a controlled temperature range, resolving the contradiction between selectivity optimization and temperature range restriction.

The patent creates distinct functional zones within the catalyst structure through the presence of amorphous phase (45-75 wt.%) and crystalline phases with specific XRD patterns. The amorphous phase provides high surface area and active sites for selective ethylene formation, while the crystalline phases (with characteristic diffraction peaks at 2θ = 6.5±0.2, 7.8±0.2, 8.9±0.2, etc.) provide structural stability and define the operating temperature window, achieving both high selectivity and controlled temperature operation.