Sinter‐Resistant Pd/SiO₂ Nanocatalyst Prepared by Impregnation Method

Abstract

Dispersed on sand: Well‐dispersed Pd/SiO2 nanocatalysts with Pd loadings between 0.5 and 5.0 wt % and an excellent resistance to sintering can be prepared by using a simple impregnation method using palladium bis‐acetylacetonate as the Pd precursor. The mean size of the Pd particles on SiO2 remains at 3–4 nm even after calcination at 800 °C. The catalyst exhibits good activity for CO oxidation and aerobic oxidation of benzyl alcohol.

Kinetics of CO oxidation on palladium using microkinetics coupled with reaction route analysis

“…Thus the (a/V) for 5, 3 and 1 wt% Pd are 1.7424×10 5 , 1.1078×10 5 , 0.34024×10 5 m −1 , respectively which are used for the simulation. Figure 5 shows the prediction of conversion with the experimental data (Li et al, 2011). …”

“…The experimental condition 1, 2, 3 refer to Pd loading weight percentages (wt%) of 5, 3 and 1, respectively. The parameters used for the simulation are taken in accordance with the experimental parameters (Li et al, 2011), i.e., flow rate of 50 ml/min with inlet fraction (volume %) of 1:1:98 for CO, O 2 and He, respectively. The diameter of the bed was given as 5 mm.…”

“…The exit concentrations of each gas phase species are obtained for experimental temperature range. The exit conversion of gas phase CO obtained from the RR analysis is plotted against the experimental data (Li et al, 2011) for different Pd metal loading percentages. The experimental condition 1, 2, 3 refer to Pd loading weight percentages (wt%) of 5, 3 and 1, respectively.…”

Hydroreforming of the oils from LDPE thermal cracking over Ni–Ru and Ru supported over hierarchical Beta zeolite

“…Some of the most recent alternatives can be highlighted. For example, Li et al achieved Pd particles of 3-4 nm on silica which remained stable during calcination in air up to 800°C by impregnation with a large-molecule which behaves as a support-interacting precursor: bis-acetylacetonate [16]. Prieto et al employed impregnation with nitrates to prepare Nisupported catalysts.…”

Nanometal Thermocatalysts: Transformations, Deactivation, and Mitigation

“…The sintering of nanometals during catalysis is a major reason for the deactivation, [ 192–194 ] which thereby calls for urgent development of approaches toward mitigation. The exothermic nature of particle coalescence (Figure 17d) suggests that the coalescence of nanometals is an energetically favorable process, meaning we could only mitigate the merging kinetics toward reaching the equilibrium status, majorly through reducing of the mobility and diffusion kinetics of nanometals.…”