large pore volume and well developed mesopores can effectively adsorb all kinds of organic gases, have long analytical speed and long service life, and have low operating costs; typical indicators: benzene adsorption rate 40-60%, ctc: 80-120%, strength 95-99% product shape: it can be made into spherical or cylindrical shape according to the user's requirement. the spherical particle size range is 4-60 meshes. the cylindrical shape is φ: 2mm, 3mm, 4mm.