P对V-Mo/Ti脱硝催化剂的性能影响研究  

Effect of P on catalytic performances of V-Mo/Ti denitration catalyst

作　　者：黄力 王虎 纵宇浩 常峥峰 高义博 李金珂 于洋 Huang Li;Wang Hu;Zong Yuhao;Chang Zhengfeng;Gao Yibo;Li Jinke;Yu Yang(Datang Nanjing Environmental Protection Technology Co.,Ltd.,Nanjing 211111,Jiangsu,China;School of Environmental Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu,China)

机构地区：[1]大唐南京环保科技有限责任公司,江苏南京211111 [2]南京工程学院环境工程系,江苏南京211167

出　　处：《钢铁钒钛》2022年第1期67-73,共7页Iron Steel Vanadium Titanium

基　　金：江苏省自然科学基金(BK20210001);江苏省博士后科研资助计划(2018K076C);中国博士后科学基金(2019M651632)。

摘　　要：为提升工业V-Mo/Ti脱硝催化剂的活性,采用浸渍法对其进行P改性。使用XRD、N_(2)-吸附脱附、XPS、H_(2)-TPR、UV-vis等表征手段对催化剂的物化性质进行分析。随后,在固定床微型反应器上测试了催化剂的脱硝活性。结果显示,向V-Mo/Ti催化剂上负载P后,催化剂的晶型和孔结构无明显变化。P促进了催化剂上聚合钒的生成,导致催化剂(V^(3+)+V^(4+))/V^(5+)比率、化学吸附氧含量的增加。煅烧温度的提升则会进一步促进这个增长趋势,这对催化剂脱硝活性的提升有积极的影响。此外,P的负载还会影响催化剂的酸性。当煅烧温度较低(≤500℃)时,V-Mo-P/Ti催化剂的酸量较高。继续升高煅烧温度,催化剂上的P_(2)O_(5)增加,导致其酸性下降。500℃煅烧制得的催化剂体现了优良的脱硝活性和抗SO_(2)、H_(2)O性能,具有较好的工业应用前景。Industrial V-Mo/Ti denitration catalyst was modified by phosphorus(P)via impregnation method to enhance the catalytic performances.The catalyst was characterized by XRD,N_(2)adsorption and desorption,XPS,H_(2)-TPR and UV-vis.The denitration activities of the catalyst were tested on a fixed-bed micro-reactor.The results show that phosphorus has little impact on the crystallographic form and pore structure of the catalyst.The presence of P could increase the polymeric vanadate of the catalyst,leading to the increase of(V^(3+)+V^(4+))/V^(5+)ratio and chemisorbed oxygen.This tendency becomes more obvious with the increase of calcination temperature,which is beneficial to the improvement of denitration activities of the catalyst.Besides,the presence of P also affects the acidity of the catalyst.The V-Mo-P/Ti catalyst exhibits relatively higher acidity than that of the V-Mo/Ti catalyst at lower calcination temperatures(≤500℃).However,high calcination temperature results in the increase of P_(2)O_(5),and the acidity of the catalyst decreases accordingly.The catalyst roasted at 500℃exhibits the best catalytic activity and high resistance to SO_(2)and H_(2)O,possessing a promising perspective for industrial application.

关 键 词：V-Mo/Ti催化剂 脱硝 改性剂 P 煅烧温度 

分 类 号：TF823[冶金工程—有色金属冶金] TQ426[化学工程]