十氢萘
萘
选择性
催化作用
镍
溴化铵
胶束
纳米颗粒
异构化
沸石
材料科学
溴化物
化学
无机化学
化学工程
水溶液
有机化学
纳米技术
肺表面活性物质
工程类
作者
Xiaoyun Song,Qingxin Guan,Yu Shu,Xiaojing Zhang,Wei Li
出处
期刊:Chemcatchem
[Wiley]
日期:2019-01-18
卷期号:11 (4): 1286-1294
被引量:13
标识
DOI:10.1002/cctc.201801788
摘要
Abstract Ni@MCM‐41 catalyst that has uniformly distributed, highly dispersed Ni nanoparticles (about 2.3 nm) was designed and successfully synthesized by in situ encapsulation of Ni in the channels of MCM‐41. This catalyst exhibits excellent thermal stability and hydrogenation activity. Water insoluble nickel acetylacetonate (Ni(acac) 2 ) was first dissolved aqueous solution of cetyltrimethyl ammonium bromide (CTAB) and encapsulated in micelles of CTAB. Sodium silicate was used as a silicon source to rapidly hydrolyze and then wrap on the micelle surface to synthesize the MCM‐41 zeolite. The MCM‐41 zeolite encapsulating Ni(acac) 2 was synthesized within a short time (4 h) at 120 °C. Compared with conventional supported catalysts, thus 3 wt.% Ni@MCM‐41 has ultra‐small uniformly distributed Ni nanoparticles and exhibits improved activity for the hydrogenation of naphthalene to decalin at very low reaction temperatures. The TOF and the apparent activation energy of Ni@MCM‐41 and the conventional catalysts (Ni/MCM‐41 and Pt/MCM‐41) were evaluated and compared. And the catalysis mechanism was analyzed. Furthermore, this Ni@MCM‐41 catalyst offers an additional advantage of selectivity in decalin isomerization; 92 % trans‐decalin selectivity was achieved at a wide temperature range.
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