With the continuous concern of haze, the control of air pollution has become more and more important. Nitrogen oxides are one of the main air pollutants and important precursors to induce photochemistry smog and acid rain. About 60% of them are discharged from coal-fired power plants, industrial boilers and cement plants.

Micro-electromechanical system (MEMS) is a kind of high-tech device whose size is several millimeters or even smaller. It is a kind of high-tech electromechanical device, which combines photolithography, etching, thin film, LIGA, silicon micro-processing, non-silicon micro-processing and precision machining technology. It is an independent intelligent system.

In recent years, the emission of sulfur compounds has seriously affected human health, social and economic development, which has stimulated scientists to explore more effective catalysts to reduce sulfur compounds in fuels. Polyoxometalates are called "green" industrial catalysts. They include tungsten heteropoly acids, such as phosphotungstic acid and silicotungstic acid, which are widely used in industry.

In recent years, due to the rapid development of automotive industry, the demand for fuel oil is increasing all over the world. The exhaust gas from sulfide combustion in fuel has brought serious environmental problems, so it is particularly important to limit the sulfur content of fuel. Oxygen desulfurization technology has high desulfurization efficiency and mild reaction conditions. Under ambient temperature and pressure conditions, low operating cost and simple process have attracted much attention.