Preparation method for zeolitic imidazolate frameworks
申请人:China University of Petroleum-Beijing
公开号:US10815253B2
公开(公告)日:2020-10-27
The present invention provides a preparation method for zeolitic imidazolate frameworks. The preparation method comprises: adding a metal carbonate or oxide, an organic ligand to a hydrophilic liquid to obtain a mixture; introducing an acidic gas to reach a reaction pressure of 0.1 MPa to 2.0 MPa, and reacting for a predetermined time; heating to 30° C.-60° C. and vacuuming to obtain the zeolitic imidazolate framework. The present invention also provides a zeolitic imidazolate framework obtained by the above preparation method. The preparation method according to the present invention is environmentally friendly and has a high yield.
Highly Efficient Non-Precious Metal Electrocatalysts Prepared from One-Pot Synthesized Zeolitic Imidazolate Frameworks
作者:Dan Zhao、Jiang-Lan Shui、Lauren R. Grabstanowicz、Chen Chen、Sean M. Commet、Tao Xu、Jun Lu、Di-Jia Liu
DOI:10.1002/adma.201304238
日期:2014.2
synthesis of non‐PGM ORR electrocatalysts through thermolysis of one‐pot synthesized ZIF is demonstrated. The electrocatalysts exhibit excellent activity, with a maximum volumetric current density of 88.1 A cm−3 measured at 0.8 V in PEFC tests. This approach not only makes ZIFs‐based electrocatalysts easy to scale up, but also paves the way for the tailored synthesis of electrocatalysts.
通过单罐合成ZIF的热解,可以轻松合成非PGM ORR电催化剂。电催化剂表现出优异的活性,在PEFC测试中,在0.8 V下测得的最大体积电流密度为88.1 A cm -3。这种方法不仅使基于ZIFs的电催化剂易于扩大规模,而且为定制的电催化剂合成铺平了道路。
WO2007/87434
申请人:——
公开号:——
公开(公告)日:——
Structural Descriptors of Zeolitic–Imidazolate Frameworks Are Keys to the Activity of Fe–N–C Catalysts
Active and inexpensive catalysts for oxygen reduction are crucially needed for the widespread development of polymer electrolyte fuel cells and metal air batteries. While iron nitrogen carbon materials pyrolytically prepared from ZIF-8, a specific zeolitic imidazolate framework (ZIF) with sodalite topology, have shown enhanced activities toward oxygen reduction in acidic electrolyte, the rational design of sacrificial metal organic frameworks toward this application has hitherto remained elusive. Here, we report for the first time that the oxygen reduction activity of Fe-N-C catalysts positively correlates with the cavity size and mass specific pore volume in pristine ZIFs. The high activity of Fe-N-C materials prepared from ZIF-8 could be rationalized, and another ZIF structure leading to even higher activity was identified. In contrast, the ORR. activity is mostly unaffected by the ligand chemistry in pristine ZIFs. These structure property relationships will help identifying novel sacrificial ZIF or porous metal organic frameworks leading to even more active Fe-N-C catalysts. The findings are of great interest for a broader application of the class of inexpensive metal-nitrogen carbon catalysts that have shown promising activity also for the hydrogen evolution (Co-N-C) and carbon dioxide reduction (Fe-N-C and Mn-N-C).