Preparation of Mesoporous CeO2 with High Thermal Stability by Ammonium Carbonate Hydrolysis Method

IF 0.8 4区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR

无机化学学报 Pub Date : 2013-10-10 DOI:10.3969/J.ISSN.1001-4861.2013.00.219

Chen Shanhu, G. Yi, Lan Li, Zhao Ming, Shi Zhonghua, Gong Maochu, Chen Yaoqiang

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引用次数: 2

Abstract

Two series of CeO2 materials were prepared by two different synthetic routes, i.e. the conventional ammonia precipitation route (CR) and the ammonium carbonate hydrolysis route (HA) using (NH4)(2)CO3 in the presence of hydrogen peroxide. The formation process and decomposition behavior of the precipitates were investigated by FTIR, Raman, thermogravimetric and differential thermal analysis (TG/DTA) and X-ray photoelectron spectroscopy (XPS). The results show that the as-prepared precipitate obtained by HA consists of O-2(2-), CO32- and OH- species. However, after hydrothermal digestion at 80 degrees C, the CO32- species is gradually hydrolyzed into OH- species. Although the chemical components of the digested precipitates prepared by these two routes are almost the same, the agglomeration of CeO2 particles is markedly modified. The CeO2 powder produced by HA exhibits higher thermal stability and better reduction property compared to that obtained by CR. After the heat treatment at 900 degrees C for 3 h, the CeO2 powder from HA route still remains a surface area of 27 m(2).g(-1).

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碳酸铵水解法制备高热稳定性介孔CeO2

采用两种不同的合成路线，即常规氨沉淀法(CR)和在过氧化氢存在下用(NH4)(2)CO3水解碳酸铵法(HA)制备了两个系列的CeO2材料。采用红外光谱(FTIR)、拉曼光谱(Raman)、热重、差热分析(TG/DTA)和x射线光电子能谱(XPS)研究了沉淀的形成过程和分解行为。结果表明，羟基磷灰石制备的沉淀物主要由O-2(2-)、CO32-和OH-三种组分组成。但经过80℃的水热消化，CO32-类逐渐水解为OH-类。虽然这两种方法制备的消化沉淀物的化学成分几乎相同，但CeO2颗粒的团聚现象明显改变。与CR法制备的CeO2粉体相比，HA法制备的CeO2粉体表现出更高的热稳定性和更好的还原性能，在900℃下热处理3 h后，HA法制备的CeO2粉体的表面积仍保持在27 m(2).g(-1)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

无机化学学报化学-无机化学与核化学

CiteScore

1.40

自引率

42.90%

发文量

8709

审稿时长

2.2 months

期刊介绍： “Chinese Journal of Inorganic Chemistry” publishes fundamental studies in all phases of inorganic chemistry, including solid-state chemistry, coordination chemistry, inorganic materials chemistry, bioinorganic chemistry, organometallic chemistry, theoretical inorganic chemistry, supermolecule chemistry, applied inorganic chemistry and related field of catalysis. Emphasis is on the synthesis, thermodynamics, kinetics, spectroscopy, structure and bonding properties of new and known compounds. In addition to full-length research articles, “Chinese Journal of Inorganic Chemistry” also publishes notes, letters, and reviews. “Chinese Journal of Inorganic Chemistry” accepts manuscript written in simplified Chinese or English.