x與其他組分的相互作用，進(jìn)而提高VOx的可還原性及V5+的占比，使Sn-V/UiO-66催化劑表面的VOx提供更多的酸性位點(diǎn)。中毒后的K-Sn-V/UiO-66催化劑仍然具有較高的總酸量和較強(qiáng)的氧化還原性，表明Sn-V/UiO-66催化劑具有優(yōu)異的抗堿金屬中毒能力。;V/UiO-66 catalyst and modified Sn-V/UiO-66 catalyst were prepared by impregnation method with UiO-66 as carrier, and their potassium poisoning was simulated. The reaction and deactivation mechanisms of vanadium-titanium catalyst were analyzed. Results demonstrate that the crystallographic form of catalysts barely changes after K-loading, and the specific surface area of the catalysts has an irregular fluctuation. The catalyst activity is decreased rapidly after the alkali metal was loaded due to the degraded metal redox performance and the rapidly decreased surface acid content of the catalysts. The addition of Sn can enhance the interaction between VOx and other components, which thereby increases the V5+ content and reducibility of VOx. Thus, VOx on the surface of Sn-V/UiO-66 catalysts can provide more acid sites. The poisoned K-Sn-V/UiO-66 catalyst still has high total acid content and strong redox property, presenting the high resistance of Sn-V/UiO-66 catalyst against alkali metal poisoning."/>
3-SCR;改性;UiO-66 catalyst;catalytic denitration;NH3-SCR;modification"/>