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

doi:10.19894/j.issn.1000-0518.240154

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (11): 1620-1628.DOI: 10.19894/j.issn.1000-0518.240154

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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.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)

Abstract

Abstract:

Using Pt（NH₃）₄Cl₂ and Pd（NO₃）₂·2H₂O 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

CLC Number:

O643

Li-Mei SUN, Li-Mei GU, Gang WANG, Xiu-Juan ZHU, Bin YU, Hong-Yang WANG, Jia-Lei LIU, He-Chang SHI. Preparation and Catalytic Performance of Pd-Pt Type Catalyst Loaded with Cordierite for Methane Combustion[J]. Chinese Journal of Applied Chemistry, 2024, 41(11): 1620-1628.

Figures/Tables 9

Fig.1 Digital photographs of the （A） Pd-Pt/Crd-1 and （B） Pd-Pt/Crd-2 catalyst

Fig.2 The X-ray diffraction pattern of Pd-Pt/Crd catalyst

Table 1 The structural parameters of Pd-Pt/Crd catalyst

Catalyst	Specific surface area/（m²·g^-1）	Total pore volume/（cm3·g^-1）	Average pore diameter/nm
Pd-Pt/Crd-1	14.983 9	0.063 0	16.821 0
Pd-Pt/Crd-2	11.407 0	0.046 7	16.377 6

Fig.3 （A， C） The SEM image of Pd-Pt/Crd-1 catalyst；（B， D） The SEM image of Pd-Pt/Crd-2 catalyst

Fig.4 The TEM image of Pd-Pt/Crd-1 （A） and Pd-Pt/Crd-2 （B）； The elemental mapping images of energy-dispersive spectroscopy for Pd-Pt/Crd-1 （C） and Pd-Pt/Crd-2 （D）（green： Pd； red： Pt）

Fig.5 XPS spectra of （A） Pd3d and（B） Pt4f in Pd-Pt/Crd

Fig.6 The （A） CO2-TPD and （B） NH3-TPD curves of Pd-Pt/Crd catalyst

Fig.7 The TG-DSC curves of （A） Pd-Pt/Crd-1 and （B） Pd-Pt/Crd-2

Fig.8 The CH4 conversion rate of Pd-Pt/Crd catalyst at different reaction temperatures

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

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