All silicon ZSM-5 adsorbent is cylindrical and used in fixed adsorption bed. It is the best choice to replace honeycomb activated carbon at present. Compared with honeycomb activated carbon, it has better stability, high temperature resistance (below 800 ℃), is not easy to coke, is not easy to catch fire, and its service life is more than 5 years. It can be regenerated repeatedly, and its adsorption capacity does not decay.