IT Home December 26 news, according to the Shanghai Institute for Advanced Study, recently, the Chinese Academy of Sciences Shanghai Institute for Advanced Study engineering science team in the 3D printing technology to prepare vehicle methanol reforming hydrogen catalyst research progress.
The high transportation and storage costs and low energy density of hydrogen are one of the obstacles to the promotion and application of hydrogen-powered fuel cell vehicles in the market. On-board methanol reforming hydrogen production can supply hydrogen to fuel cell vehicles without using hydrogen as a direct raw material, providing an effective path to reduce their fuel storage costs and transportation costs.
▲ 3D printing of methanol reforming hydrogen catalyst
The traditional catalyst has low mechanical strength, and the bed is easily broken during the high-speed movement of the vehicle, which affects the catalyst activity, and it is necessary to develop a catalyst preparation technology with high mechanical strength while maintaining high catalytic activity.
Based on this, the engineering science team proposed a 3D printing technology to prepare a monolithic catalyst, and developed a new 3D printing catalyst preparation method with high mechanical strength and high catalytic activity by regulating the carrier composition and calcination temperature and improving the spatial structure of the catalyst.
▲ (a) substrate carrier after :D LP-3D printing, (b): impregnated sample after dry crystallization, (c): calcined sample, (d) (e): SEM image of the sample and AFM surface morphology
The catalyst carrier prepared by light-curing 3D printing technology was studied, and the metal ion distribution was tested in combination with low-field nuclear magnetic resonance space, and the relationship between mechanical strength, porosity and calcination temperature composition in 3D printed alumina porous support was analyzed, and the diffusion effect of metal ions in porous support was revealed, and the nmrography quantitative test metal ion distribution technology was developed. By drying crystallization calcination method, the active group stratification of copper-zinc sheet layer structure was successfully synthesized on a porous support of high mechanical strength alumina. By improving the spatial structure of the alumina carrier, the heat transfer and mass transfer efficiency are improved, the bed pressure drop is reduced, and the catalytic effect of methanol reforming reaction is improved. After the optimization of the reaction parameters, the spatio-temporal yield of hydrogen per unit mass catalyst reached 536 mol/kgcat/h, which exceeded most of the catalysts of the same type reported so far. At the same time, the catalyst has high mechanical strength and radial crush strength of 152.4 N / mm, which is 4 times that of the current traditional particle catalyst, which can adapt to the situation of on-board acceleration and bumps.
The research helps to promote the development of methanol reforming hydrogen production technology in the field of vehicle fuel cells, and provides new ideas for the development of new monolithic catalysts.
IT House understands that the results were published in the Journal of Energy Chemistry. The research has been funded by the Chinese Academy of Sciences Youth Innovation Promotion Association, the Chinese Academy of Sciences Science and Technology Network Service Program, and the National Natural Science Foundation of China.