应用化学 ›› 2024, Vol. 41 ›› Issue (11): 1620-1628.DOI: 10.19894/j.issn.1000-0518.240154

• 研究论文 • 上一篇    下一篇

堇青石负载Pd-Pt型催化剂的制备及催化甲烷燃烧性能

孙立梅1, 谷丽梅1, 王刚1, 朱秀娟1, 于滨1, 王宏扬2, 刘家磊2(), 史和昌3   

  1. 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
  • 收稿日期:2024-05-12 接受日期:2024-10-19 出版日期:2024-11-01 发布日期:2024-12-04
  • 通讯作者: 刘家磊

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

Li-Mei SUN1, Li-Mei GU1, Gang WANG1, Xiu-Juan ZHU1, Bin YU1, Hong-Yang WANG2, Jia-Lei LIU2(), He-Chang SHI3   

  1. 1.Petroleum Engineering Technology Research Institute of Sinopec Shengli Oilfield Branch,Dongying 257000,China
    2.Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China
    3.Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
  • Received:2024-05-12 Accepted:2024-10-19 Published:2024-11-01 Online:2024-12-04
  • Contact: Jia-Lei LIU
  • About author:liujialei@caas.cn
  • Supported by:
    the Projects of Sinopec Shengli Oilfield Branch(YC2308)

摘要:

以Pt(NH34Cl2和Pd(NO32·2H2O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。

关键词: 催化剂, 双金属, 甲烷燃烧, 催化活性

Abstract:

Using Pt(NH34Cl2 and Pd(NO32·2H2O 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.

Key words: Catalysts, Bimetallic, Methane combustion, Catalytic activity

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