The active centers of ethoxylation are composed of WO x and W 6+ ; the active centers of activated alcohol are the weak Bronsted acid sites of carrier ( e.g., HZSM-5 ).

• 氧缺位的WOx 和W6+ 共同组成催化剂表面L酸活性中心 ；而载体 (如H -ZSM -5)弱的B酸位是醇 (ROH)的活性中心 .