堇青石负载Pd-Pt型催化剂的制备及催化甲烷燃烧性能  

Preparation and Catalytic Performance of Pd-Pt Type Catalyst Loaded with Cordierite for Methane Combustion

作　　者：孙立梅 谷丽梅 王刚[1] 朱秀娟 于滨 王宏扬 刘家磊 史和昌 SUN Li-Mei;GU Li-Mei;WANG Gang;ZHU Xiu-Juan;YU Bin;WANG Hong-Yang;LIU Jia-Lei;SHI He-Chang(Petroleum Engineering Technology Research Institute of Sinopec Shengli Oilfield Branch,Dongying 257000,China;Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China;Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China)

机构地区：[1]中国石化胜利油田分公司石油工程技术研究院,东营257000 [2]中国农业科学院农业环境与可持续发展研究所,海淀100081 [3]中国科学院长春应用化学研究所,生态环境高分子材料重点实验室,长春130022

出　　处：《应用化学》2024年第11期1620-1628,共9页Chinese Journal of Applied Chemistry

基　　金：中国石油化工股份有限公司胜利油田分公司项目(No.YC2308)资助。

摘　　要：以Pt(NH_(3))_(4)Cl_(2)和Pd(NO_(3))_(2)·2H_(2)O为Pt和Pd的前驱体盐,堇青石(Crd)陶瓷蜂窝材料为载体,采用浸渍法制备了Pd-Pt/Crd型催化甲烷燃烧性能的催化剂Pd-Pt/Crd-1[n(Pd):n(Pt)=1:2]和Pd-Pt/Crd-2[n(Pd):n(Pt)=2:1]。实验表明,2种催化剂均能在载体表面均匀分散,且Pt和Pd存在形式相同。其中,掺杂n(Pd):n(Pt)=2:1型催化剂的颗粒间空隙大于n(Pd):n(Pt)=1:2,其表面上负载的金属Pd/Pt的催化位点多于n(Pd):n(Pt)=1:2。此外,掺杂n(Pd):n(Pt)=2:1的催化剂的表面存在更加丰富的酸性位点,具有更加优异的热稳定性。催化甲烷燃烧反应活性的实验显示,2种催化剂均能在450℃达到几乎100%的甲烷的完全转化效率,其中n(Pd):n(Pt)=2:1型催化剂在燃烧温度为410℃时能够达到68.43%的甲烷转化效率,是n(Pd):n(Pt)=1:2型催化剂(60.08%)的1.14倍,因此当金属Pd与Pt的掺杂摩尔比为2:1时,该催化剂在低温区域表现出最佳的催化性能。Using Pt(NH_(3))_(4)Cl_(2) and Pd(NO_(3))_(2)·2H_(2)O as precursor salts of Pt and Pd,and cordierite(Crd)ceramic honeycomb material as carrier,Pd-Pt/cordierite type catalysts for methane combustion performance,Pd-Pt/Crd-1[n(Pd)∶n(Pt)=1∶2]and Pd-Pt/Crd-2[n(Pd)∶n(Pt)=2∶1],were prepared by impregnation method.The measurement results show that both catalysts can be uniformly dispersed on the surface of the carrier,and Pt/Pd exist in the same form.Wherein the interstitial space between particles doped with n(Pd)∶n(Pt)=2∶1 type catalyst is greater than n(Pd)∶n(Pt)=1∶2,and the catalytic sites of metal Pd/Pt loaded on its surface are more than n(Pd)∶n(Pt)=1∶2.Moreover,catalyst doped with n(Pd)∶n(Pt)=2∶1 exhibits richer acidic sites on the surface,showing superior thermal stability.The experimental results on catalytic activity of methane combustion reaction show that both catalysts can achieve almost 100%complete methane conversion efficiency at 450℃.Impressively,the n(Pd)∶n(Pt)=2∶1 catalyst can achieve a methane conversion efficiency of 68.43%at a combustion temperature of 410℃,which is 1.14 times higher than the n(Pd)∶n(Pt)=1∶2 catalyst(60.08%).Therefore,the catalyst demonstrates optimal catalytic performance in the low-temperature region when the doping molar ratio of metals Pd to Pt is 2∶1.

关 键 词：催化剂 双金属 甲烷燃烧 催化活性 

分 类 号：O643[理学—物理化学]