Synthesis of Dispersed Mesoporous Powders of Solid Solution Zr0.88Ce0.12O2 for Catalyst Carrier of the Conversion of Methane to Synthesis-Gas

被引：1

作者：

Morozova L.V. ^{[1
]}

Drozdova I.A. ^{[1
]}

机构：

[1] Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg

来源：

Inorganic Materials: Applied Research | 2020年 / 11卷 / 05期

关键词：

catalyst carrier; coprecipitation; mesopores; nanocrystalline powders; solid solutions based on ZrO[!sub]2[!/sub; ultrasonic treatment;

D O I：

10.1134/S2075113320050238

中图分类号：

学科分类号：

摘要：

Abstract: The xerogels in the system 0.88 mol % ZrO2–0.12 mol % CeO2 were obtained by the method of coprecipitation in a neutral (pH 7) and slightly alkaline (pH 9) medium under the influence of ultrasound with the size of the agglomerates of 70–230 nm. It is shown that the coprecipitation of hydroxides of zirconium and cerium at pH 9 with the use of ultrasonic treatment facilitates the formation of primary crystalline particles in the xerogel, whose size is ~ 5 nm, whereas the xerogel synthesized in a neutral environment consists only of the X-ray amorphous phase. The effect of pH precipitation on deposition processes of dehydration of the xerogels and crystallization of the solid solution based on zirconia oxide in the metastable pseudocubic modification (с'-ZrO2) was discovered. It was found that, in the temperature range of 500–800°C, there is a phase transition с'-ZrO2 → t-ZrO2; the size of the crystallites of the formed tetragonal solid solutions is 8 and 11 nm. The dispersion properties and characteristics of the pore structure of the powders of the solid solution Zr0.88Ce0.12O2 were investigated by the method of low-temperature nitrogen adsorption. It is determined that the specific surface area of t-ZrO2 samples obtained after firing at 800°C is 117 and 178 m2/g, the total pore volume reaches 0.300–0.325 cm3/g, and the pore size distribution is monomodal and is in the range of 2–8 nm. The effect of thermal “aging” at a temperature of 800°C (40 h) on the structure and dispersion of the solid solution t-ZrO2 powders was studied. © 2020, Pleiades Publishing, Ltd.

引用

页码：1244 / 1252

页数：8

共 19 条

[1]

Arutyunov V.S., Krylov O.V., Oxidative conversion of methane, Russ. Chem. Rev., 7, pp. 1216-1245, (2005)

[2]

Usachev N.Y., Kharlamov V.V., Belanova E.P., Conversion of hydrocarbons to synthesis-gas: problems and prospects, Petrol. Chem., 51, pp. 96-106, (2011)

[3]

Song Y.Q., He D.H., Xu B.Q., Effects of preparation methods of ZrO 2 support on catalytic performances of Ni/ZrO 2 catalysts in methane partial oxidation to syngas, Appl. Catal., A, 337, 1, pp. 19-28, (2008)

[4]

Demidov D.V., Sakharovskii Y.A., Rozenkevich M.B., Nickel–zirconium catalysts for syngas production by methane vaporacid conversion, Usp. Khim. Khim. Tekhnol., 26, pp. 63-68, (2012)

[5]

Antsiferov V.N., Porozova S.E., Solnyshkov I.V., Loktev A.S., Et al., Effect of zirconium dioxide on the properties of nickel catalysts of oxidative conversion of methane, Perspekt. Mater., 11, pp. 65-70, (2013)

[6]

Galanov S.I., Sidorova O.I., Effect of a precursor on the phase composition and particle size of the active component of Ni–ZrO<sub>2</sub> catalytic systems for the oxidation of methane into syngas, Russ. J. Phys. Chem. A, 88, pp. 1629-1636, (2014)

[7]

Kuznetsova T.G., Sadykov V.A., Specific features of the defect structure of metastable nanodisperse ceria, zirconia, and related materials, Kinet. Catal., 49, pp. 840-858, (2008)

[8]

Gusev A.I., Nanomaterials, Nanostructures, and Nanotechnology, (2007)

[9]

Gusev A.I., Kurlov A.S., Certification of nanocrystalline materials by particle size (grains), Metallofix. Nov. Tekhnol., 30, pp. 679-694, (2008)

[10]

Sing K.S.W., Everett D.H., Haul R.A.W., Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity, Pure Appl. Chem., 57, pp. 603-619, (1985)

← 1 2 →