In terms of hydrogen energy supply, China's hydrogen production in 2021 is about 33 million tons. Hydrogen, as a fundamental industrial raw material, is widely used in industries such as chemical, power, and electronics. Among them, industrial by-product hydrogen has a large volume, wide distribution, and good economic efficiency. China has a unique advantage in hydrogen supply.
However, the requirements for industrial hydrogen and fuel hydrogen are completely different. It is necessary to break free from the limitations of traditional industrial hydrogen extraction processes and adopt proprietary methods to solve the problem of deep removal of CO and sulfur in fuel hydrogen. The special requirements and problems of fuel hydrogen require specialized devices for specialized treatment, breaking down the technical barriers between industrial hydrogen and fuel hydrogen.
For hydrogen fuel cells, there are high requirements for the quality of hydrogen gas used. This high requirement not only refers to the purity of hydrogen gas, but even if it reaches 99.999% purity, if the content of impurities such as CO, sulfur, and halides exceeds the standard, it will still cause irreversible damage to the fuel cell, greatly affecting its service life. How to effectively remove sensitive and toxic impurities such as carbon monoxide and sulfides from fuel cells in high-purity hydrogen gas, and achieve GB/T37244-2018 "Fuel Hydrogen for Proton Exchange Membrane Fuel Cell Vehicles", is particularly crucial. Corresponding solutions are provided based on tailored hydrogen classification

1、 Hydrogen production by electrolysis of water
Electrolytic water hydrogen production can be divided into green electricity hydrogen production and traditional energy hydrogen production, with green electricity hydrogen production mainly distributed in areas with abundant renewable energy resources. There are four main technical routes for hydrogen production through electrolysis of water: alkaline electrolysis of water (AEL), proton exchange membrane (PEM), solid oxide (SOEC), and anion exchange membrane (AEM) electrolysis. Among them, AEM and SOEC have not yet formed commercialization. The main impurities in hydrogen produced by electrolysis of water are saturated water and oxygen.
 
2、 Coal based hydrogen production and natural gas based hydrogen production
In China, coal based hydrogen production and natural gas based hydrogen production are the main methods of hydrogen production. The hydrogen produced from these methods is generally extracted through traditional pressure swing adsorption processes to obtain industrial hydrogen with different purity and requirements, which can be matched with different usage scenarios in industry. Due to different execution standards and requirements, the vast majority of industrial hydrogen cannot meet the hydrogen requirements for fuel cell vehicles.
Methane steam reforming (SMR) in natural gas hydrogen production is The main hydrogen production technology. At present, the total amount of natural gas resources in China is insufficient and unevenly distributed, which to some extent limits the development of natural gas hydrogen production in China. The commercialization of coal based hydrogen production technology is mature and has obvious cost advantages, making it suitable for large-scale hydrogen production. Moreover, China has abundant coal resources, with coal resources mainly being abundant in the west and scarce in the east, and abundant in the north and poor in the south. Inner Mongolia, Shanxi, and Shaanxi have high coal production and relatively low coal prices.
The types of impurities contained in hydrogen in the industrial industry are complex. Depending on the source of raw gas, there are also significant differences in the types and contents of impurities. It is necessary to use proprietary methods to solve the deep removal of impurities such as CO and sulfur in fuel hydrogen. After economically purifying some weakly adsorbed impurities in industrial hydrogen, it can meet the requirements of hydrogen quality for fuel cell vehicles.