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High-purity C 2 H 4 and C 2 H 2 are the most commonly used basic raw materials for synthetic chemicals in industry
.
In the process of industrial production of ethylene, acetylene by-products will inevitably be produced.
Adsorption-based separation methods, such as adsorption separation and membrane separation, are effective methods to solve this problem because of their high efficiency and low cost
.
In recent years, many researchers have developed different types of microporous materials such as metal organic framework materials (MOFs), zeolites and activated carbons for the separation of C 2 hydrocarbons, and have achieved good separation performance at low temperatures
Recently, the team of Professor Zhang Zhenxin and Li Yanshuo of Ningbo University reported that a kind of transition metal oxide molecular sieves (ZOMOs) based on ε-Keggin units, namely sodium cobalt molybdate (Na-CM), can be realized at higher temperatures.
Effective separation of C 2 hydrocarbons
Figure 1.
POM structure model based on ε-Keggin unit
The material cavity (7.
4 Å) is formed by connecting ten POM units, and the opening is only 3.
4 Å, which is close to the size of C 2 hydrocarbon gas
.
This material has different adsorption properties for C 2 H 6 , C 2 H 4 and C 2 H 2 , and has strong interaction with C 2 H 4 and C 2 H 2 , and has a high ideal solution adsorption theory ( IAST) selectivity
Figure 2.
Na-CM at 85℃, 100kPa, (a) C 2 H 4 /C 2 H 6 , (b) C 2 H 2 /C 2 H 6 , (c) C 2 H 2 /C 2 H The breakthrough curve of 4 and (d) the corresponding gas breakthrough selectivity
.
The material shows good performance in terms of repeatability, stability and separation performance.
Dynamic competitive adsorption experiments show that the material can effectively separate C 2 binary mixtures and even ternary mixtures, and has high selectivity
.
When the temperature is increased to 85 ℃, the material can still maintain good separation performance
This result was recently published on Angewandte Chemie International Edition.
