ArticleSilicoaluminophosphate molecular sieve DNL-6: Synthesis with a novel template, N,N′-dimethylethylenediamine, and its catalytic application

Add time:08/18/2019    Source:sciencedirect.com

DNL-6, a silicoaluminophosphate (SAPO) molecular sieve with RHO topology, was hydrothermally synthesized using a new structure-directing agent (SDA), N,N′-dimethylethylenediamine. The obtained samples were characterized by X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, scanning electron microscopy, and N2 adsorption, which indicated that the synthesized DNL-6s have high crystallinity and relatively high Si content ranging from 20% to 35%. Solid-state magic-angle-spinning (MAS) nuclear magnetic resonance (13C, 29Si, 27Al, 31P, and 27Al multiple-quantum (MQ)) was conducted to investigate the status of the SDA and local atomic environment in the as-synthesized DNL-6. Thermal analysis revealed the presence of a large amount of amines in the DNL-6 crystals (about 4.4 SDAs per α-cage), which was the reason for the formation of DNL-6 with an ultrahigh Si content (36.4% Si per mole). Interestingly, DNL-6 exhibited excellent catalytic performance for methanol amination. More than 88% methanol conversion and 85% methylamine plus dimethylamine selectivity could be achieved due to the combined contribution of strong acid sites, suitable acid distribution, and narrow pore dimensions of DNL-6.

We also recommend Trading Suppliers and Manufacturers of N,N-Dimethylethylenediamine (cas 108-00-9). Pls Click Website Link as below: cas 108-00-9 suppliers

Prev:Regular paperSelective inhibition by bis(2-chloroethyl)methylamine (nitrogen mustard) of the Na+/K+/Cl− cotransporter of murine L1210 leukemia cells
Next:Full length articlePlasma enhanced atomic layer deposited silicon dioxide with divalent Si precursor [N,N′-tert-butyl-1,1-dimethylethylenediamine silylene])