超低银量显著提高了Ni/Ag/MgAlO双金属催化剂上甲烷干重整的稳定性

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Ran Ji, Weiguang Su, Xiaoyong Men, Jiadi Yang, Xudong Song, Yonghui Bai, Jiaofei Wang, Peng Lv, Guangsuo Yu
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引用次数: 0

摘要

将不同浸渍顺序的Ni、Ag双金属催化剂应用于甲烷干重整反应。当Ag/Ni的摩尔比仅为1/19时,超低量Ag不仅大大提高了Ni催化剂的稳定性,而且没有降低甲烷和二氧化碳的转化率。Ag浸渍顺序对DRM反应的活性和稳定性以及Ni、Ag双金属催化剂的理化性能有重要影响。先浸渍Ag再浸渍Ni合成的Ni/Ag/MgAlO在DRM反应中具有最高的活性和稳定性。在800℃下反应26 h后,CH4转化率从94.5 %略微下降到90.2 %,CO2转化率从96.3% %略微下降到92.7 %。Ag通过抑制晶须碳的成核和生长,有效地减少了碳的沉积量。Ag还增强了Ni与MgAlO的相互作用,阻止了Ni的聚集。Ni/Ag/MgAlO先浸渍Ag再浸渍Ni,其Ni、Ag和MgAlO相互作用最强,Ni0粒径最小,碳沉积量最少,最终在不降低DRM反应活性的前提下极大地提高了DRM反应的稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ultra-low amount of Ag substantially improves the stability for dry reforming of methane on Ni/Ag/MgAlO bimetallic catalyst

Ultra-low amount of Ag substantially improves the stability for dry reforming of methane on Ni/Ag/MgAlO bimetallic catalyst
Ni, Ag bimetallic catalysts with different impregnation sequence were applied to dry reforming of methane (DRM) reaction. When the molar ratio of Ag/Ni was only 1/19, ultra-low amount of Ag not only greatly improved the stability of Ni catalyst, but also did not reduce the methane and CO2 conversions. The impregnation sequence of Ag had an important effect on the activity and stability of DRM reaction as well as the physical and chemical properties of Ni, Ag bimetallic catalysts. Ni/Ag/MgAlO synthesized by first impregnating Ag and then Ni had the highest activity and stability in DRM reaction. CH4 conversion only decreased slightly from 94.5 % to 90.2 % and CO2 conversion from 96.3 % to 92.7 % after reacting for 26 h at 800 ℃. Ag effectively mitigated the amount of carbon deposition by inhibiting the nucleation and growth of whisker carbon. Ag also enhanced the interaction between Ni and MgAlO, preventing the aggregation of Ni species. Ni/Ag/MgAlO first impregnated Ag and then Ni had the strongest interaction among Ni, Ag and MgAlO, the smallest Ni0 particle size, and produced the least amount of carbon deposition, finally immensely improved the stability of DRM reaction without decreasing the DRM reaction activity.
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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