Green Hydrogen Production from Waste Metal

提出了一种利用高压氢气回收废铝的新型环保型水解工艺，并进行了实验验证。主要考察了氢氧化钠溶液浓度对产氢速率的影响。在实验中，蒸馏水和铝粉被放置在哈氏合金制成的耐压反应器中，并通过液体泵被压缩到所需的恒定水压。将不同浓度（1.0 ~ 5.0 mol/dm3）的氢氧化钠溶液由液泵替代蒸馏水，以定流量注入反应器，同时测定氢气的产率。由于放热反应，反应器内液体温度升高。因此，将废铝与氢氧化钠溶液混合，在室温下生成高压氢气。由于该工艺中使用的氢气压缩机比传统的氢气压缩机能耗更低，因此实验验证了氢气的产生压力接近30 MPa，同时还有一种有用的副产品氢氧化铝。

An innovative environment-friendly hydrolysis process for recycling waste aluminum with the generation of high-pressure hydrogen has been proposed and experimentally validated. The effect of the concentration of sodium hydroxide solution on hydrogen generation rate was mainly examined. In the experiments, distilled water and aluminum powder were placed in the pressure-resistance reactor made of Hastelloy, and was compressed to a desired constant water pressure using a liquid pump. The sodium hydroxide solution was supplied by liquid pump with different concentrations (from 1.0 to 5.0 mol/dm3) at a constant flow rate into the reactor by replacing the distilled water and the rate of hydrogen generated was measured simultaneously. The liquid temperature in the reactor increased due to the exothermic reaction. Therefore, a high-pressure hydrogen was generated at room temperature by mixing waste aluminum and sodium hydroxide solution. As the hydrogen compressor used in this process consumes less energy than the conventional one, the generation of hydrogen having a pressure of almost 30 MPa was experimentally validated together with aluminum hydroxide a useful by-product.