Balancing Ce covering and Ni dispersion by precipitant dropwise addition control in Ni-Ce0.8Zr0.2O2 catalyst for dry reforming of methane

IF 4.8 2区 化学 Q2 CHEMISTRY, PHYSICAL
Geon-Hyeong Lee , Hyeon-Seok Kang , Jung-Hoon Lee , Dong-Seong Kim , Dae-Woon Jeong , Hyun-Seog Roh , Yeol-Lim Lee
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引用次数: 0

Abstract

Ni-Ce0.8Zr0.2O2 catalysts were synthesized via co-precipitation by varying the precipitant dropwise addition time (0, 5, 10, 20 min) to control nucleation and growth dynamics. This parameter critically influences the physicochemical properties of the catalysts, particularly the oxygen storage capacity (OSC) and Ni dispersion. Rapid dropwise addition (0, 5 min) resulted in insufficient lattice distortion, yielding fewer oxygen vacancies and lower oxygen storage capacity. Conversely, overly slow dropwise addition (20 min) led to excessive Ce3 + migration, promoting the Ce covering effect and suppressing Ni0 dispersion. An optimal dropwise addition time (10 min) revealed balanced characteristics with high OSC and superior Ni0 dispersion, leading to improved catalytic activity and stability in the dry reforming of methane. These findings demonstrate that fine-tuning of precipitation kinetics is crucial for optimizing Ce-Ni interfacial phenomena and maximizing catalytic performance.
甲烷干重整Ni- ce0.8 zr0.2 o2催化剂中沉淀剂滴加控制平衡Ce覆盖和Ni分散
通过改变沉淀剂滴加时间(0、5、10、20 min)来控制Ni-Ce0.8Zr0.2O2催化剂的成核和生长动力学,采用共沉淀法合成Ni-Ce0.8Zr0.2O2催化剂。该参数对催化剂的物理化学性质,特别是氧存储容量(OSC)和Ni分散性能有重要影响。快速滴入(0,5 min)导致晶格畸变不足,产生更少的氧空位和更低的氧存储容量。相反,过慢的滴入速度(20 min)会导致Ce3 +过度迁移,促进Ce覆盖效应,抑制Ni0色散。最佳滴加时间(10 min)表现出高盐含量和优异Ni0分散的平衡特性,从而提高了甲烷干重整的催化活性和稳定性。这些发现表明,沉淀动力学的微调对于优化Ce-Ni界面现象和最大化催化性能至关重要。
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来源期刊
Applied Catalysis A: General
Applied Catalysis A: General 化学-环境科学
CiteScore
9.00
自引率
5.50%
发文量
415
审稿时长
24 days
期刊介绍: Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.
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