Cooperative chemical adsorption of acid gases in functionalized metal-organic frameworks
An acid gas, organic framework technology, applied in the field of metal-organic frameworks with metal atoms, which can solve problems such as reduced adsorption capacity
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example 1
[0107] To illustrate the present technique, several metal-organic frameworks (mmen-M 2 (dobpdc): mmen=N, N'-dimethylethylenediamine; M=Mg, Mn, Fe, Co, Zn; dobpdc 4- = 4,4'-Dioxybiphenyl-3,3'-dicarboxylate).
[0108] All reagents and solvents were purchased and were of reagent grade purity or higher; N,N'-dimethylethylenediamine (mmen) was dissolved in n-hexane to form a stock solution with a concentration of 10% v / v for amines functional reaction. mmen solution in N 2 stored in a 200 mL Schlenk bottle under conditioned conditions and by adding freshly ground CaH 2 Keep sewage free of moisture. Compound H 4 (dobpdc) was synthesized using conventional methods.
[0109] for Mg 2 (dobpdc) synthesis, the H 4 dobpdc (27.4mg, 0.10mmol) was added to a 20ml glass scintillation vial, followed by Mg(NO 3 ) 2 ·6H 2 O (64.0 mg, 0.25 mmol) and 10 ml of mixed solvent (55:45 MeOH:DMF). The scintillation vials were then sealed with polytetrafluoroethylene (PTFE) lined caps and plac...
example 2
[0113] To further illustrate the principle of operation of the method, spectroscopic and diffraction measurements were used to determine the sorbent (such as mmen-Mg 2 (dobpdc)) Adsorption of CO 2 The mechanism behind the formation of steep steps. In particular, in the isomeric compound mmen-Mn 2 Powder X-ray diffraction studies performed on (dobpdc) provide insight into the CO 2 How to key in specific structural information in the channel of the material. After exposing the sample to 5 bar CO 2 Diffraction data collected at 100K before or after showed only a 1.112(8)% shrinkage in unit cell volume, but exhibited large changes in the relative intensities of selected diffraction peaks.
[0114] By using the simulated annealing method, a complete structural model for data setting is formed, such as Rietveld refinement of the data after implementation by TOPAS-Academic software. When exposed to CO 2 Previously, the mmen molecule was bonded to the Mn through an amine group ...
example 3
[0118] CO 2 The adsorption mechanism suggests that changes in the metal-amine bond strength may provide a means to tune the position of the isotherm step. Measured Mmen-M 2 CO of (dobpdc)(M=Mg, Mn, Fe, Co, Ni, Zn) compounds at 25, 40, 50 and 75°C 2 Adsorption isotherm series. With the exception of Ni compounds that show conventional Langmuir-type adsorption behavior, all other materials show steep isotherm steps that shift to higher pressures with increasing temperature. The Hill coefficients of M=Mg, Mn, Fe, Co, and Zn are 10.6, 5.6, 7.5, 11.5, and 6.0, respectively, through the analysis of the isotherm ladder at 25°C, reflecting the CO 2 Synergy of adsorption mechanism.
[0119] For a given temperature, the step position varies in the order of Mg
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