CH4/N2 separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure
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Chabazite
Preparation of Shaped Binder‐Free SSZ‐13 Zeolite and Its Application in CO2 Adsorption and Catalysis
Abstract SSZ‐13, small‐pore zeolite with chabazite (CHA) topology, exhibits outstanding performance in gas adsorption‐separation and catalysis. However, most of the studies on SSZ‐13 zeolite are limited to the powder form. In practical application, the SSZ‐13 zeolite should be shaped with a certain amount of inert binder into technical form resulting in reduced performance. Herein, shaped binder‐free SSZ‐13 zeolite was prepared by treating the extruded SSZ‐13/SiO 2 sample with amantadine solution under hydrothermal conditions, to crystallize the SiO 2 binder into the zeolite phase. The characterization and DFT calculation results point out that the recrystallization of SiO 2 binder in shaped SSZ‐13 into zeolite crystal could improve the physical and chemical properties. Enhanced CO 2 adsorption capacity and catalysis performance in CO 2 ‐assisted oxidative dehydrogenation of ethane and propane were also found on the shaped binder‐free SSZ‐13 zeolite.
Chabazite
Hydrothermal Synthesis
Propane
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Chabazite
Thermal Stability
Hydrothermal Synthesis
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Clinoptilolite
Chabazite
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Current research on synthesis of zeolite and zeolite-like molecular sieve materials were reviewed. The research trend on zeolite molecular sieve synthesis was evaluated. Questions worth to pay attentions in synthesis research were pointed out, and research prospect on this field was also given.
Sieve (category theory)
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Chabazite
Sodalite
Mordenite
Ferrierite
Nanoporous
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Chabazite
Analcime
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Zeolite Phi is synthesized by two methods reported previously. Results from X-ray powder diffraction and scanning electron microscopy suggest that the materials are physical mixtures of chabazite and offretite; one sample has a small amount of phillipsite. The X-ray powder diffraction data from these samples, and those reported previously, are indexed and their unit-cell parameters compare well to those obtained from a physical mixture of chabazite and offretite. These samples show multiple particle morphologies that are indicative of physical mixtures. Zeolite Phi is concluded to be a physical mixture of chabazite and offretite and we suggest that the use of the name zeolite Phi be discontinued.
Chabazite
Powder Diffraction
Particle (ecology)
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The interzeolite conversion of faujasite (FAU-type) zeolites to chabazite (CHA-type) zeolite in the presence of N,N,N-trimethyladamantammonium and N,N,N-dimethylethylcyclohexylammonium cations was investigated over a large compositional range by carefully controlling the reaction mixture compositions. Highly crystalline CHA zeolites were also obtained by the transformation of several zeolite types including EMT, LTL, LEV, RTH, and MFI frameworks. The formation of CHA zeolite from FAU zeolite precursors was substantially faster than that from zeolite L with a similar composition. High-silica CHA zeolites were also produced successfully using a mixture of TMAda with a number of less expensive organic structure-directing agents. The CHA zeolite materials have been synthesized with high crystallinity and with a Si/Al ratio ranging from 5 to 140. Our data support the importance of structural similarity between the zeolite precursors, nucleation/crystallization processes, and the zeolite product in the interzeolite conversion compared to conventional amorphous aluminosilicate gels. Our synthetic methods could be used to prepare other 8-membered ring zeolites such as AEI and AFX frameworks, potential candidates for selective catalytic reduction of NOx, light olefin production, and CO2 abatement.
Chabazite
Faujasite
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4Azeolite molecular sieve was synthesized from natural zeolite.The effect of alkali solution and crystaillization conditions on synthesis of the zeolite molecular sieve was studied.The zeolite products were characterized by biological microscope and XRD.The natural zeolite was dissolved in 9%alkali solution at 60℃for 2h,and then aluminum was added to the solution before erystallization hydrothermally at 90 ℃ for 6h.Finally,the product was characterized by IR and SEM.It showed that under these conditions zeolite molecular sieve products was good erystallionity was obtained.
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(1) The changes in the zeolite chabazite during sorption have been investigated by means of X-ray examination of single crystals and of powders. (2) The heats of sorption for very small additions ammonia to the zeolite have been measured. (3) A theory has been advanced to explain the results.
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