Thermal behavior of the mixed composition xSb2O3–(1 − x)Bi2O3–6(NH4)2HPO4

Melnikov, Petr; Santos, H. W. L. dos; Gonçalves, Renato V.

doi:10.1007/s10973-009-0551-0

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…Compared with the sample prepared using the impregnation method and mechanical mixing method, the CeZrPAl samples prepared using the sol–gel method exhibit a shift towards smaller pores, with a portion of the pore size distribution being in the range of 0–2 nm, indicating the presence of some micropores in the sample. The formation of micropores might be due to the decomposition of ammonium salts during the calcination process of phosphorus-containing samples [ 45 ]. The more the micropores present, the larger the specific surface area and pore volume.…”

Section: Resultsmentioning

confidence: 99%

“…With an increase in phosphorus content in the CeZrPAl samples, the pore size distribution gradually shifts towards smaller pores, with a portion of the pore size distribution in the range of 0–2 nm, indicating the presence of some micropores in the samples. The formation of micropores is due to the decomposition of ammonium salts during the calcination process of phosphorus-containing samples [ 45 ]. Therefore, as the phosphorus content increases, the number of micropores in the sample also increases, resulting in a larger specific surface area and pore volume of the sample.…”

Section: Resultsmentioning

confidence: 99%

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The Effect P Additive on the CeZrAl Support Properties and the Activity of the Pd Catalysts in Propane Oxidation

Feng,

Li,

Yang

et al. 2024

Materials

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The properties of a catalyst support are closely related to the catalyst activity, yet the focus is often placed on the active species, with little attention given to the support properties. In this work, we specifically investigated the changes in support properties after the addition of P, as well as their impact on catalyst activity when used for catalyst preparation. We prepared the CeO2-ZrO2-P2O5-Al2O3 (CeZrPAl) composite oxides using the sol–gel, impregnation, and mechanical mixing methods, and characterized the support properties using techniques such as XRD, XPS, SEM-EDS, N2 adsorption–desorption, and Raman spectra. The results showed that the support prepared using the sol–gel method can exhibit a more stable phase structure, larger surface area, higher adsorption capacity for oxygen species, and greater oxygen storage capacity. The addition of an appropriate amount of P is necessary. On the one hand, the crystallization and growth of CePO4 can lead to a decrease in the Ce content in the cubic phase ceria–zirconia solid solution, resulting in a phase separation of the ceria–zirconia solid solution. On the other hand, CePO4 can lock some of the Ce3+/Ce4+ redox pairs, leading to a reduction in the adsorption of oxygen species and a decrease in the oxygen storage capacity of the CeZrPAl composite oxides. The research results indicated that the optimal P addition is 6 wt.% in the support. Therefore, we prepared a Pd/CeZrPAl catalyst using CeZrAl with 6 wt.% P2O5 as the support and conducted the catalytic oxidation of C3H8. Compared with the support without P added, the catalyst activity of the support loaded with P was significantly improved. The fresh and aged (1000 °C/5 h) catalysts decreased by 20 °C and 5 °C in T50 (C3H8 conversion temperature of 50%), and by 81 °C and 15 °C in T90 (C3H8 conversion temperature of 90%), respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%