• Korean Journal of Poultry Science
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• v.29 no.2
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• pp.101-108
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• 2002

An experiment was conducted to compare the influences of artificial zeolite(AZ) produced from fly ash and natural zeolite(NZ), those were supplemented into broiler diets, on performances, intestinal microbes and some blood chemistry for 5 wks. The experimental diets contained 21.5 and 19% CP fur starting and finishing period, respectively. The ME was 3,100 kcal/kg of feed in both starter and finisher diets. Three hundred twenty chicks were assigned to 5 treatments with 4 replicates and fed one of five experimental diets containing different levels of AZ or NZ ; 0% zeolite, 1.5% AZ, 3.0% AZ, 1.5% NZ, and 3.0% NZ. Weight gain, feed intake and feed conversion were measured with weekly basis. Blood cholesterol and intestinal microflora were analyzed at the end of the experiment. Weight gain of chicks fed with NZ tended to increase, but was not statistically different from other diet groups. However, the birds of fed with 3.0% AZ showed significant decrement of weight gain compared to that of control(P<0.05). No significant difference in feed intake was found among five treatment. Feed conversion was significantly improved in 3.0% NZ treatment relative to that of 3.0% AZ(P<0.05). There were no consistent differences in intestinal microbes between the control and zeolite groups. Blood cholesterol was significantly lower in 3.0% NZ treatments than the others(P<0.05). These results suggest that AZ can be added to broiler feeds less than 1.5% without any detrimental effects on chick performances.

• Korean Journal of Soil Science and Fertilizer
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• v.32 no.4
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• pp.446-451
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• 1999

This study was carried out to investigate some mineralogical characteristics of Artificial Granular Zeolite (AGZ) and effect of AGZ on purification and alleviation of rice seedling damages of mine wastewater containing heavy metals. AGZ had mainly representative Na-P1 peaks and some $C_3S$ peaks of Portland cement in X-ray diffractogram. Differential thermal analysis represented that AGZ had weak endothermic peak around $130^{\circ}C$ and new deep endothermic peak around $750^{\circ}C$ as compared to powdery artificial zeolite. The ranking of heavy metals removals by AGZ, was lead> copper> cadmium> zinc in the synthetic wastewater. Root growth of rice seedling was greatly inhibited in the mine wastewater, and died after all. As AGZ treated into the mine wastewater with the ratio 1 : 50 (W : V) for one day or 1 : 100 for 4 days, the concentrations of heavy metals in the mine wastewater were decreased to below the critical concentration for agricultural use. And rice seedlings were grew with little damages in the purified water by AGZ.

• Clean Technology
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• v.30 no.2
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• pp.123-133
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• 2024

Zeolite template carbon (ZTC) was synthesized as an adsorbent to remove low-concentration CH₄ from the atmosphere. The synthesis of ZTC was performed using CH₄ and C₂H₂ as carbon precursors and their impact on adsorption was investigated. ZTC was also synthesized using Y zeolite ion-exchanged with CaCl₂ and LiCl as templates to investigate the effect of using metals in ion exchange. The comparison of the carbon precursors revealed that C₂H₂ had a higher carbon yield than CH₄. The synthesized ZTC exhibited developed micropores due to carbon deposition deep inside the micropores of the zeolite template. The kinetic diameter of C₂H₂ (0.33 nm) is smaller than that of CH₄ (0.38 nm), which allowed for its deposition. The study compared metal precursors used for ion exchange and confirmed that the CaCl₂-based ZTC developed more micropores compared to the LiCl-based ZTC. The ion-exchanged Ca inhibited pore blocking by the carbon precursor, allowing it to enter the pores. The ability of synthesized ZTC to adsorb N₂ and CH₄ at 298 K was investigated. The results showed that CH₄ had a higher overall adsorption amount than N₂. The sample synthesized using C₂H₂ and CaY exhibited the highest N₂ and CH₄ adsorption capacity. However, the sample synthesized with CH₄ had the highest CH₄/N₂ gas uptake ratio, which is a crucial factor in designing an adsorption process. The observed difference was likely caused by the underdevelopment of ultrafine pores that are associated with N₂ adsorption. This resulted in a reduction of N₂ adsorption, leading to an increase in CH₄/N₂ separation.

• Korean Chemical Engineering Research
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• v.51 no.4
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• pp.476-481
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• 2013

Ethylbenzene (EB) which has a similar physical properties with p-xylene (pX) was separated from EB/pX mixture by using MFI-type zeolite (TS-1, ZSM-5, and Silicalite-1) coated membranes. The zeolites were synthesized by microwave method to reduce the synthesis time and uniformly formed zeolite particles were coated on the ${\alpha}$-almina tubular support with a thickness of $3-4{\mu}m$. Separation factor and permeation flux of the synthesized zeolite coated membranes were measured to survey the best performance of ethylbenzene separation from different composition of EB/pX mixtures. When the EB/pX mixture of 5:5 molar ratio applied for the separation experiment, it represented the highest separation factor. We also have studied about the effect of the atomic composition of zeolites on the separation performance within the temperature range from 160 to $220^{\circ}C$. TS-1 showed the highest permeation flux of $1,666mol/m^{2*}s^*Pa$ and Silicate-1 showed the highest separation factor of 1.73 at $200^{\circ}C$ respectively.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.13 no.3
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• pp.22-27
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• 2014

Nanosized zeolite was prepared in an autoclave at a hydrothermal temperature range of 100 to $170^{\circ}C$. In TEM and particle-size analyses, the size of the nanosized powders was found to be 10-300 nm, and its distribution is uniform and spherical, depending on the hydrothermal temperature. XRD confirms that the nanosized powder is MFI zeolite.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.3
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• pp.114-119
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• 2004

An oxyge generator, which is applied to a particular space such as automobile, must consider compactness and lightweight as well as problems caused by noise, vibration and heat dissipation. For these matters, a BLDC motor was adopted to reduce heat while a bed using synthetic zeolite NaX made it possible to generate high-density oxygen with relatively small size. Moreover, owing to the characteristic of synthetic zeolite Nax, a two-head vacuum pump was designed to desorb nitrogen without additional pump unit.

• Journal of the Korean Ceramic Society
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• v.33 no.9
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• pp.1064-1072
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• 1996

The synthetic conditions and characteristics of ZSM-5 type zeolites (ZSM-5/silicalite) for the preparation of the zeolite composite membranes for gas separation were investigated. ZSM-5 zeolites could be synthesized by the hydrothermal treatment of the mixture of colloidal silica sol aluminum nitrate sodium hydroxide and TPABr at a temperature range of 150-17$0^{\circ}C$ in the autoclave. Silicalties were done from the solution of water glass water and TPABr. Their crystalline structures transformed from orthorhombic to monoclinic from and their pore structures of three-dimensional channels were opened as TPABr filling channels was burned off at the calcination temperature of 50$0^{\circ}C$. The specific surface area of the calcined zeolite was about 360 m3/g and its surface property was hydrophobic. Crystal sizes of ZSM-5 and silicalite were 0.5-1.0${\mu}{\textrm}{m}$ and 8-10${\mu}{\textrm}{m}$ respectively having no change due to the calcination. In particular the shape and the size of the ZSM-5 type zeolite were sensitively varied with silica sources and concentrations of reaction solutions/sols.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.175-176
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• 2006

Zeolite의 이온교환 특성과 균일한 기공과 결정 모양을 가지는 구조적 특성을 이용하여 CdS 양자점 클러스터를 합성하였다. 합성된 CdS-Zeolite는 구조적으로 안정된 나노 크기의 새로운 반도체 물질이 된다. 또한 Zeolite 결정들이 유리판에 밀집하여 배열되는 경향을 이용하므로 CdS 양자점이 합성된 제올라이트를 기판에 정렬, 박막을 형성한다. CdS-Zeolite 결정 박막은 SEM 측정을 통해 구조와 표면 정렬 상태를 알고, photoluminescence 측정으로 양자점 특성의 발광 파장을 가짐을 알 수 있다.

• Korean Chemical Engineering Research
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• v.49 no.5
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• pp.657-663
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• 2011

Structure directing agent(SDA) containing piperidine moiety such as piperidine(PI), 2-methylpiperidine (MPI), 2,6-dimethylpiperidine(DMPI) and 2,2,6,6,-tetramethylpiperidine(TMPI), respectively has been utilized to synthesize aluminophosphate zeolite using hydrothermal method. The gel composition was $1.0Al_2O_3:1.0P_2O_5:0.76SDA:45H_2O$ and the hydrothermal heating was performed in an oven at 443 K and for 7 days at static mode. The obtained zeolitic material contained a lamellar structure when PI was used as the SDA. With a progressive increase of the SDA size, various structures of aluminophosphate including AlPO-5 of AFI structure were obtained. The aluminophosphate of SAS structure was formed when the largest TMPI was utilized as the SDA, which was confirmed by the Rietveld refinement. The result of $^{27}Al$ and $^{31}P$ MAS NMR of the sample suggested that Al and P were incorporated into the framework of the aluminophosphate.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2001.11a
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• pp.92-94
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• 2001

An experiment was conducted to compare the dietary supplemental influence of artificial zeolite produced from fly ash and natural zeolite on performance and physiological related factor of broiler chicks for five weeks. Diets contained CP 21.5, 19% and ME 3,100, 3,100kcal/kg for starting and finishing period. Three hundred twenty chicks were replaced into five treatments with four replicates. Control, 1.5 and 3.0% artificial(AZ) or natural zeolite(NZ) were supplemented to the basal diets, respectively. Weight gain, feed intake and feed conversion were weekly examined. Blood cholesterol, intestinal microflora, nutrients availability were measured at the end of experiment. Weight gain of chicks fed NZ tended to increase, but was not statistically different. However, the birds of fed 3.0% AZ showed significant decrement of weight gain compared to that of control(P<0.05). Feed intake was no difference in all treatments. Feed conversion was significantly improved in 3.0% NZ treatment relative to that of 3.0% AZ(P<0.05). There were no consistency in intestinal microbes between control and supplemental groups. Blood cholesterol was significantly lower in 3.0% NZ treatments than other treatments(P<0.05). Crude fiber digestibility of birds fed 3.0% NZ was significantly improved compared to that .of other treatments(P<0.05). As the results, artificial zeolite showed no detrimental effect in less than 1.5% addition on performance of broiler chicks.