It was found that tungsten-based transition metal catalysts have excellent platinum substitution function. However, the agglomeration of nanoparticles and the existence of low density active centers in the synthesis process still puzzle the synthesis of such materials.

In recent days, Intel can be said to be sitting on the needle. Since AMD released the Rzen series of processors, AMD has regained a lot of market share from Intel with its advanced multi-core architecture and excellent comprehensive performance. In the face of competitors' catch-ups and upgrades, the toothpaste factory no longer dared to squeeze toothpaste, and sacrificed many techniques at the bottom of the box.

Tungsten trioxide nano-multistage structure refers to nanowires, nanorods, nanosheets and other nanostructures formed by the combination of two or more components. At present, some scholars have prepared corresponding materials by thermal evaporation, electrospinning and other processes, but these preparation methods will involve high temperature, high vacuum, high technical difficulties and other issues, which are contrary to the development of low power consumption.

Sulfuric acid and hydrochloric acid are commonly used as catalysts for the synthesis of ethyl acetate. In addition to traditional inorganic acids, there are solid superacids and ionic liquids supported on mesoporous materials. The inorganic acid catalyst corrodes the instrument seriously, and the homogeneous catalytic products are not easy to separate, which is easy to produce waste acid waste liquid and other pollutants. Solid acid also has the disadvantage of serious corrosion to the instrument, and the catalytic activity decreases quickly and the cost is high.