Template free crystallization of zeolite Rho via Hydrothermal synthesis: Effects of synthesis time, synthesis temperature, water content and alkalinity
Source abstract
Abstract
Abstract Four parameters affecting organic template free hydrothermal synthesis of Rho zeolite were investigated, including synthesis time, synthesis temperature, water content, and alkalinity. XRD and SEM techniques were applied to characterize the synthesized zeolite Rho powders. The results showed that synthesis time has a higher impact on the crystal size. The crystal size increases from 1.45 to 1.90 μm by increasing synthesis time from 4 to 10 days. Synthesis time is also effective on the crystals morphology and there is an extremum in the diagram of crystallinity versus synthesis time for zeolite Rho. In addition, synthesis temperature has high impact on morphology of the crystals and can change the zeolite phases. Besides, water content is also highly effective on crystallinity of the synthesized powders and with increasing water content the crystallinity decreases dramatically. At last, increasing alkalinity increases the nucleation and decreases the crystals size. At water content of 400 mol, pollucite phase was synthesized at two ratios of Na 2 O/Al 2 O 3 =6 and Cs 2 O/Al 2 O 3 =0.8, and also two ratios of Na 2 O/Al 2 O 3 =9 and Cs 2 O/Al 2 O 3 =1.2; and for these ratios the mean crystal sizes were 0.70 and 0.40 μm, respectively, confirming the negative effect of alkalinity on the mean crystal size.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Zeolite Catalysis and Synthesis · Mesoporous Materials and Catalysis · Catalytic Processes in Materials Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (52)
Show source-provided references
1. Pure, single phase, high crystalline, chamfered-edge zeolite 4A synthesized from coal fly ash for use as a builder in detergents10.1016/j.jhazmat.2006.02.014 ↗
2. Laundry detergent additive containing zeolite, polycarboxylate, and perborate10.1016/0144-2449(91)80394-F ↗
3. Reaction pathways of methanol over Pt/zeolite catalysts: effect of different active sites10.1016/0144-2449(89)90047-X ↗
4. Catalytic performances of dealuminated Hβ zeolite supported Pt catalysts doped with Cr in hydroisomerization of n-heptane10.1016/j.cej.2008.12.016 ↗
5. Modified ZSM-5 zeolite as DENOX catalyst10.1016/S0269-7491(98)80100-0 ↗
6. Adsorption of carbon dioxide on alkali-modified zeolite 13X adsorbents10.1016/S1750-5836(07)00072-2 ↗
7. The investigation of phenol removal from aqueous solutions by zeolites as solid adsorbents10.1016/j.jhazmat.2010.08.059 ↗
8. Kinetics of sorption in deactivated zeolite crystal adsorbents10.1016/S0098-1354(02)00259-4 ↗
9. Application of natural zeolites in the purification and separation of gases10.1016/S1387-1811(03)00353-6 ↗
10. On the optimization of gas separation processes using zeolite membranes10.1205/026387603765444483 ↗
11. Gas separation characteristics of DDR type zeolite membrane10.1016/j.micromeso.2003.11.016 ↗
12. Fundamentals and applications of pervaporation through zeolite membranes10.1016/j.memsci.2004.06.059 ↗
13. A study on the pervaporation of water–acetic acid mixtures through ZSM-5 zeolite membranes10.1016/S0376-7388(03)00172-8 ↗
14. Pervaporation dehydration of ethylene glycol by NaA zeolite membranes10.1016/j.cherd.2011.12.003 ↗
15. Membrane separation process—pervaporation through zeolite membrane10.1016/j.seppur.2008.07.010 ↗
16. Catalytic dehydrogenation of cyclohexane in an FAU-type zeolite membrane reactor10.1016/j.memsci.2003.08.004 ↗
17. Hydrogen-selective zeolite membrane reactor for low temperature water gas shift reaction10.1016/j.cej.2012.05.064 ↗
18. Isobutane dehydrogenation in a DD3R zeolite membrane reactor10.1016/j.cej.2010.11.021 ↗
19. Ion exchange in zeolite EU-1: Part 2. The effect of the chemical nature of the exchange site10.1016/0144-2449(94)90127-9 ↗
20. Synthesis and characterization of zeolite W and its ion-exchange properties to K+ in seawater10.1016/j.powtec.2012.04.046 ↗
21. Synthesis of highly ordered cubic zeolite A and its ion-exchange behavior10.1016/j.colsurfa.2009.06.038 ↗
22. Chapter four—zeolites and their potential uses in agriculture
23. Solubility of apatite in clay and zeolite bearing systems: application to agriculture10.1016/0169-1317(87)90037-8 ↗
24. Copper cation removal in an electrokinetic cell containing zeolite10.1016/j.jhazmat.2010.10.086 ↗
25. Magnetic P zeolites: synthesis, characterization and the behavior in potassium extraction from seawater10.1016/j.seppur.2008.04.015 ↗
26. Magnetic properties of Co-impregnated zeolites10.1016/j.jmmm.2009.07.046 ↗
27. Selective detection of hazardous VOCs using zeolite/Metglas composite sensors10.1016/j.sna.2011.12.030 ↗
28. The effect of platinum clusters in the zeolite micropores of a zeolite-based potentiometric hydrocarbon gas sensor10.1016/j.snb.2008.11.039 ↗
29. Zeolite-modified WO3 gas sensors—Enhanced detection of NO210.1016/j.snb.2011.08.014 ↗
30. Zeolites in biomedical application: Zn-exchanged clinoptilolite-rich rock as active carrier for antibiotics in anti-acne topical therapy10.1016/j.clay.2004.04.004 ↗
31. van Bekkum · 2001
32. Payra · 2003
33. Synthesis of zeolites
34. Crystallization process of zeolite rho prepared by hydrothermal synthesis using 18-crown-6 ether as organic template10.1016/j.jcis.2012.02.038 ↗
35. The hydrothermal synthesis of zeolites: precursors, intermediates and reaction mechanism10.1016/j.micromeso.2005.02.016 ↗
36. Rigid unit modes and the phase transition and structural distortions of zeolite rho10.1016/S1387-1811(98)00207-8 ↗
37. Selective N,N-methylation of aniline over cocrystallized zeolites RHO and zeolite X (FAU) and over Linde type L (Sr,K-LTL)
38. Flexibility of the zeolite RHO framework: effect of dehydration on the crystal structure of the beryllophosphate mineral, pahasapaite10.1016/0144-2449(91)80302-G ↗
39. The structure of cesium-exchanged zeolite-RhO at 293K and 493K determined from high resolution neutron powder data10.1016/0025-5408(83)90062-4 ↗
40. Cesium-free synthesis of aluminosilicate RHO zeolite in the presence of cationic polymer10.1016/j.micromeso.2010.03.012 ↗
41. J. Bronić, Handbook of Zeolite Science and Technology, Theoretical and Practical Aspects of Zeolite Crystal Growth, Zagreb, Croatia, 2003.
42. Influence of alkalinity of the starting system on size and morphology of the zeolite A crystals10.1016/j.matchemphys.2011.12.043 ↗
43. Controllable and SDA-free synthesis of sub-micrometer sized zeolite ZSM-5. Part 1: influence of alkalinity on the structural, particulate and chemical properties of the products10.1016/j.micromeso.2010.10.043 ↗
44. Organic template-free synthesis of ZSM-5/ZSM-11 co-crystalline zeolite10.1016/j.micromeso.2011.05.033 ↗
45. Synthesis of zeolite Zsm-5 small particle aggregates by a two-step method in the absence of an organic template10.1016/S1872-2067(10)60275-6 ↗
46. Organic template-free synthesis of ZSM-5 zeolite particles using rice husk ash as silica source10.1016/j.ceramint.2012.07.083 ↗
47. Amine-templated syntheses and crystal structures of zeolite rho analogs10.1016/S1387-1811(98)00122-X ↗
48. Synthesis of zeolite rho: aging temperature effect10.1007/BF01134026 ↗
49. X. Liu, X. Zhang, X. Tan, Z. Chen, Hydrothermal synthesis of zeolite Rho using methylcellulose as the space-confinement additive, Ceramics International, in press10.1016/j.ceramint.2012.12.054 ↗
50. Incorporation of boron into nano-size MFI zeolite structure using a novel microwave-assisted two-stage varying temperatures hydrothermal synthesis10.1016/j.micromeso.2010.07.011 ↗
51. Effect of reaction temperature on hydrothermal syntheses of potassium type zeolites from coal fly ash10.1016/j.minpro.2008.03.001 ↗
52. The influence of gel alkalinity in the synthesis and physicochemical properties of the zeolite [Ti,Al]-Beta10.1016/j.micromeso.2007.11.019 ↗