Se掺杂改性增强CO催化剂Pt/TiO_(2)抗硫性能机理  

Mechanism of Se doping modification to enhance the sulfur resistance of CO catalyst Pt/TiO_(2)

作　　者：王延 何璐瑶[2] 黄海敏 罗望平 朱刚[1] 梁明华 刘弼华 WANG Yan;HE Luyao;HUANG Haimin;LUO Wangping;ZHU Gang;LIANG Minghua;LIU Bihua(Zhongye Changtian International Engineering Co.,Ltd.Hunan Zhongye Changtian Energy Conservation and Environmental Protection Technology Co.,Ltd.,Changsha 410205,Hunan,China;Zhongye Changtian International Engineering Co.,Ltd.Technology and Information Management Department,Changsha 410205,Hunan,China;Baosteel Zhanjiang Iron and Steel Co.,Ltd.,Zhanjiang 524072,Guangdong,China;Wuhan Iron and Steel Co.,Ltd.,Wuhan 430083,Hubei,China)

机构地区：[1]中冶长天国际工程有限责任公司湖南中冶长天节能环保技术有限公司,湖南长沙410205 [2]中冶长天国际工程有限责任公司科技与信息化管理部,湖南长沙410205 [3]宝钢湛江钢铁有限公司,广东湛江524072 [4]武汉钢铁有限公司,湖北武汉430083

出　　处：《烧结球团》2025年第1期110-116,共7页Sintering and Pelletizing

基　　金：国家重点研发计划重点专项资助项目(2021YFB3500600);湖南省创新平台与人才计划资助项目(2020RC4027)。

摘　　要：针对含硫烧结烟气中Pt/TiO_(2)催化氧化CO过程中SO_(2)毒化的问题,采用硒(Se)掺杂改性提高其抗硫性。通过固定床抗硫毒化性能测试、孔隙结构分析、XRD、XPS和SO_(2)-TPD等表征手段,研究了Se掺杂增强Pt/TiO_(2)催化剂(PSeT)抗硫能力的原因。结果表明;掺杂质量分数为0.1%的Se,Pt/TiO_(2)催化剂(PSe_(0.10)T)具有最优的抗硫性能,200℃通入798 mg/m^(3)SO_(2)时,催化效率从100%略微降低,且在12 h长期测试后脱除率仍大于80%,去掉SO_(2)后,催化效率逐渐恢复至100%;SO_(2)毒化后,PSe_(0.10)T催化剂的N_(2)吸附量、比表面积降低幅度较小,抑制硫酸盐沉积效果明显;SO_(2)毒化后,XRD测试结果均未发现新物相,XPS测试结果表明PSe_(0.10)T催化剂表面S元素含量最低,且硫化产物为TiOSO 4;SO_(2)-TPD分析表明,PSe_(0.10)T催化剂对SO_(2)吸附性较弱,且具有较低的硫酸盐分解温度,表现出良好的抗硫性能。该研究结果可为开发高性能抗硫CO氧化催化剂提供理论依据。Aiming at the problem of catalytic oxidation of CO by Pt/TiO_(2)in sulfur-containing sintering flue gas,selenium(Se)doping modification is used to improve its sulfur resistance.The reasons for Se-doping to enhance the sulfur resistance of Pt/TiO_(2)catalyst(PSeT)are studied by means of fixed bed sulfur resistance toxicity test,pore structure analysis,XRD,XPS and SO_(2)-TPD.The results show that the Pt/TiO_(2)catalyst(PSe_(0.10)T)doped with 0.1%Se has the best sulfur resistance performance.When 798 mg/m^(3)SO_(2)is introduced at 200℃,the catalytic efficiency decreases slightly from 100%,and the removal rate is still greater than 80%after a long-term test of 12 h.After removing SO_(2),the catalytic efficiency gradually recovers to 100%;after SO_(2)poisoning,the N_(2)adsorption amount and specific surface area of the PSe_(0.10)T catalyst decrease slightly,and the sulfate deposition inhibition effect is obvious;after SO_(2)poisoning,no new phase is found in the XRD test results,and the XPS test results show that the S content on the surface of the PSe_(0.10)T catalyst is the lowest,and the sulfurization product is TiOSO 4;SO_(2)-TPD analysis shows that the PSe_(0.10)T catalyst has weak SO_(2)adsorption and a low sulfate decomposition temperature,showing good sulfur resistance performance.The results can provide a theoretical basis for the development of high-performance sulfur resistance CO oxidation catalyst.

关 键 词：Pt/TiO_(2)催化剂 CO催化氧化 改性 抗硫 

分 类 号：X757[环境科学与工程—环境工程]