Preparation of Pd-Pt/HZSM-5 catalysts and their catalytic performance for low-concentration methane combustion

被引：0

作者：

Gao, Qianwen ^{[1
]}

Wang, Xiaobo ^{[1
]}

Deng, Cunbao ^{[1
]}

Zhang, Xinqi ^{[1
]}

Wang, Xuefeng ^{[1
]}

Wang, Xun ^{[1
]}

机构：

[1] College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Shanxi, Taiyuan

来源：

Jingxi Huagong/Fine Chemicals | 2024年 / 41卷 / 08期

关键词：

bimetal; catalysts; catalytic combustion; HZSM-5; low-concentration methane;

D O I：

10.13550/j.jxhg.20230459

中图分类号：

学科分类号：

摘要：

Pd-Pt/HZSM-5 catalysts were prepared by impregnation method using Pt(NH3)4Cl2 and Pd(NO3)2•2H2O as precursor salts of Pt as well as Pd, and HZSM-5 molecular sieves as carriers. The Pd-Pt/HZSM-5 catalysts with different Si/Al ratios [n(SiO2)∶n(Al2O3)=38∶1, 200∶1, 800∶1], named as Pd-Pt/HZSM-5(38), Pd-Pt/HZSM-5(200) and Pd-Pt/HZSM-5(800), respectively, were characterized by XRD, SEM, TEM, Raman, XPS, CO2-TPD and NH3-TPD, and evaluated on their catalytic activity for low-concentration (0.5% volume fraction) methane combustion by a fixed bed reactor. The results showed that Pd-Pt/HZSM-5(38) exhibited the best catalytic performance with smaller Pd/Pt particle size (6.3 nm), the largest number of PdO crystals, active Pd/Pt species and acidic sites, the highest n(Pd0)∶n(Pd2+) and the highest Pt mass fraction (0.19%). Compared with those of Pd-Pt/HZSM-5(800) and Pd-Pt/HZSM-5(200), the ignition temperature (T10) of low-concentration methane combustion catalyzed by Pd-Pt/HZSM-5(38) decreased by 27.54 and 30.92 ℃, respectively, while the total conversion temperature (T90) was reduced by 3.38 and 17.51 ℃, respectively. Moreover, Pd-Pt/HZSM-5(38) could run stably at 360 ℃ for 150 h with no significant decrease in the activity, and the methane conversion rate was maintained above 99.6%. © 2024 Fine Chemicals. All rights reserved.

引用

页码：1788 / 1794and1803

共 45 条

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