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Stable extra-large pore zeolites are highly desirable for catalysis and molecular separation, but most remain microporous, limiting their effectiveness for bulky substrates. Among the few extra-large pore zeolites that exhibit mesoporosity, the pores typically form as elongated, non-circular pore aperture. we report NJU120-6, a stable silicate zeolite with an intrinsic cylindrical mesoporous system, have the currently largest 36-ring windows with a free diameter of 25.71 Ångstroms by 19.12 Ångstroms. NJU120-6 exhibits the lowest framework density of 9.39 Si atoms nm−3 and a pore volume of 0.66 cubic centimeters per grams. It remains stable up to 1173 K and can incorporate aluminum and titanium, enabling superior performance in catalytic cracking and in liquid-phase alkene oxidations of bulky molecules, respectively.

Source: A 36-ring zeolite with intrinsic cylindrical mesopores | Science