Zr 改性 LaNiO3 包晶材料的相变：二氧化碳转化甲烷为合成气的影响

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2024-01-22 DOI:10.3390/catal14010091

T. V. Sagar, N. Lingaiah, P. S. Sai Prasad, N. N. Tušar, U. L. Štangar

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引用次数: 0

摘要

采用溶胶-凝胶法合成了 Zr 改性 LaNiO3 催化剂（LaNixZr1-xO3；0 ≤ x ≤ 1）。使用不同的表征技术研究了材料的物理化学性质，并评估了 CO2 甲烷转化为合成气的情况。有趣的是，表征研究发现，根据材料中 Ni:Zr 的比例，会发生从 La-Zr 热绿晶体到 La-Ni 包晶体的相变。在高 Zr 含量的催化剂中观察到了热长石相的形成，从而产生了块状 NiO。在含镍量高的催化剂中观察到 La-Ni 包晶的形成，ZrO2 起到了支撑作用。在 ZrO2 上形成的 La-Ni 包晶增强了催化剂中 Ni 的分散。镍的高分散提高了催化活性，在所有研究的催化剂中，LaNi0.8Zr0.2O3 在转化率和 H2/CO 比率方面表现最佳。

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Phase Transformation of Zr-Modified LaNiO3 Perovskite Materials: Effect of CO2 Reforming of Methane to Syngas

Zr-modified LaNiO3 catalysts (LaNixZr1−xO3; 0 ≤ x ≤ 1) are synthesized by the sol–gel method. The physio-chemical properties of materials are investigated using different characterization techniques and evaluated for the CO2 reforming of methane to syngas. Interestingly, the characterization studies revealed the phase transformation from La-Zr pyrochlore to La-Ni perovskite depending on the Ni:Zr ratio in the material. The formation of the pyrochlore phase is observed for high-Zr-containing catalysts, thus leading to the production of bulk NiO. The formation of La-Ni perovskite is observed for high-Ni-containing catalysts and the ZrO2 acted as a support. The formation of La-Ni perovskite supported on ZrO2 enhanced the Ni dispersion of the catalysts. The high dispersion of Ni enhanced the catalytic activity, and LaNi0.8Zr0.2O3 showed the best performance among all of the studied catalysts in terms of conversions and the H2/CO ratio.

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来源期刊

Catalysts CHEMISTRY, PHYSICAL-

CiteScore

6.80

自引率

7.70%

发文量

1330

审稿时长

3 months

期刊介绍： Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.