A Six-Membered Ring Molecular Sieve Achieved by a Reconstruction Route

Area of Science:

• Materials Science
• Catalysis
• Separation Science

Background:

• Zeolite molecular sieves with eight-membered rings are industrially significant.
• Six-membered ring zeolites are often considered unusable due to pore blockage by templates or cations.

Purpose of the Study:

• To demonstrate a reconstruction route for creating a novel six-membered ring molecular sieve (ZJM-9) with fully open micropores.
• To evaluate the performance of ZJM-9 in selective dehydration of mixed gases.

Main Methods:

• A reconstruction method was employed to synthesize the ZJM-9 molecular sieve.
• Mixed gas breakthrough experiments (CH3OH/H2O, CH4/H2O, CO2/H2O, CO/H2O) were conducted at 25 °C to assess dehydration efficiency.

Main Results:

• The novel ZJM-9 molecular sieve exhibited efficient selective dehydration capabilities.
• ZJM-9 demonstrated a significantly lower desorption temperature (95 °C) compared to commercial 3A molecular sieve (250 °C).

Conclusions:

• A new, fully open six-membered ring molecular sieve (ZJM-9) was successfully synthesized via a reconstruction route.
• ZJM-9 shows promise for energy-efficient dehydration processes due to its lower desorption temperature.