Experimental Study On Oxidative Dehydrogenation Technology Of Gas Mixture Containing Hydrogen Under Vacuum Condition

With the depletion of primary energy and deterioration of environment, the exploitation and utilization of hydrogen energy draws more and more attention. As a clean and renewable energy, Hydrogen is an ideal substitute for fossil energy. Hydrogen recovery technology of hydrogen efficient industrial gas has been very mature and widely used. However, micro-channel catalytic combustion technology of hydrogen, hydrogen storage technology and dehydrogenation technology maintaining vacuum system operation are immature. Currently, processing methods used in high-speed hydrogen deficiency mixture in vacuum include three kinds, namely vacuum tank system, ejector system and cryogenic adsorption system. The research content of this paper consists of the preparation of nanometer copper oxide on copper substrate, experimental study on the kinetics of copper oxide powder reduction with hydrogen, and dehydrogenation experiment in vacuum. In the vacuum operating system, hydrogen flow in high-speed has been oxidized to water vapor using nanometer copper oxide component prepared, which improves the removal effect of cryogenic adsorption of hydrogen, and helps to advance its practical application.First, high density copper oxide nano-structures were synthesized on copper foil substrate and copper ball with2mm diameter by liquid-phase oxidation. Dynamic simulation of two kinds of samples has been done after properties characterization. The physical properties of CuO thin films were tested by X-ray diffraction, scanning electron microscope, and energy dispersive spectrum analysis respectively. Experimental results show that basal processing ways and temperature have little effect on the morphology of the product structure. The concentration of potassium persulphate and sodium hydroxide are the important factors affecting nano-flower density, the unassembled nano lamellar structure always exists. Nano-flake structure of copper oxide has been synthesized on the2mm copper ball surface.And then, the thermal behavior of the copper oxide power in hydrogen and nitrogen have been investigated under non-isothermal conditions by temperature programmed thermogravimetry and kinetic analysis. The results indicate that, the initial reduction temperature and peak temperature copper oxide synthesized by complex-precipitation method is reduced by about40℃. Kinetic parameters apparent activation energy (E) and of the reactions for synthesized CuO and commercial CuO nano material have been calculated respectively by Kissinger method are53.91and61.36kJ/mol, and their apparent frequency factor (A) are8.25×104min-1and1.07×105min-1, respectively.Finally, Hydrogen flow with high-speed reacts with CuO of copper substrate under an approximate30mmHg absolute pressure. The experiment result expresses that, hydrogen is an important factor of cryosorption bed’s rapid pressure rising. The hydrogen with high-speed flow under Vacuum Condition is oxidized by CuO, and slows down the pressure increasing rate of the cryosorption bed. When the pressure of adsorption bed reaches4mmHg, the removal efficiency of hydrogen for dehydrogenation components is up to more than75%, and that of removal hydrogen of spiral copper can reach86.72%.