| abstract |
Disclosed is a method for preparing a hydrogen-rich syngas by degrading polyolefin waste plastic at a low temperature, comprising: weighing 1 part by weight of polyolefin plastic and 3-80 parts by weight of hydrogen peroxide containing 0.25%-6% of H2O2; loading the weighed polyolefin plastic and hydrogen peroxide into a hydrothermal reactor to carry out an oxidation pretreatment reaction, wherein the reaction temperature is 150-230°C, the reaction pressure is 0.5-2 MPa, and the reaction duration is 30-90 min, and after the reaction has finished, obtaining a liquid phase product and a gas phase product; loading a mesoporous carbon-supported metal-based catalyst to another hydrothermal reactor, and introducing the obtained liquid phase product into the hydrothermal reactor to carry out a reforming reaction, so as to obtain a hydrogen-rich syngas product. The hydrogen yield in the entire process is close to 11 mol/kg of plastic, and the hydrogen concentration in the hydrogen-rich syngas is close to 55%. By combining low-temperature oxidation pretreatment with a reforming process, the present invention solves the bottleneck problem in which it is difficult to convert polyolefin waste plastic into hydrogen at low temperatures (<250°C). |