Abstract
PdAg/ZrO2 alloy catalysts calcined at different temperatures were employed to elucidate the effect of support-metal interaction (SMI) on methane combustion. Combustion activity was depressed when the sample was calcined at an elevated temperature from 500 °C to 700 °C. However, calcination at 850 °C enhanced the beneficial SMI, which facilitated a more active phase for the oxidation reaction. The high-resolution transmission electron microscopy experiments show that a special micro-domain structure at the interface is formed during the reduction pretreatment. H2-TPR and O2-TPD measurements illustrate that the active phase would undergo reconstruction upon redox cycles. The active phase manipulated by the support is more suitable for combustion reaction in the course of temperature altering.
Highlights
Prominent environmental problems, especially the greenhouse effect, are increasingly being caused by unburned methane [1,2,3,4] and large amounts of CO2 emissions [5]
By calculating the lattice fringes, we find that the support-metal interaction (SMI) could manipulate the structure of the active phase
It is found that the degree of SMI can be adjusted by changing the calcination temperature
Summary
Especially the greenhouse effect, are increasingly being caused by unburned methane [1,2,3,4] and large amounts of CO2 emissions [5]. The supported Pd-based catalyst has excellent catalytic performance [6,7,8,9], but the Pd-based catalyst has many shortcomings, impoverished thermal stability [10,11,12], poor selectivity [13], needy resistance to sulfide poisoning [14], etc. Pd-Pt alloy catalysts have good high-temperature thermal stability [15,16] and enhance the anti-poisoning performance [17], Pd-Ni alloy catalysts have an adjustable electronic structure showing higher power density and high stability [18], and Pd-Ag nanoalloy catalysts can increase selectivity [13] and exhibit excellent activity [19,20]; alloy catalysts are increasingly gaining value.
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