• Title, Summary, Keyword: 폐촉매

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Toluene Oxidation over Spent Zeolite Catalyst (폐제올라이트 촉매를 이용한 톨루엔 산화반응)

  • Song, Min-Young;Park, Young-Kwon;Park, Sung-Hoon;Jeon, Jong-Ki;Ko, Young-Soo;Jung, Kyeong-Youl;Yim, Jin-Heong;Sohn, Jung-Min
    • Clean Technology
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    • v.14 no.4
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    • pp.271-274
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    • 2008
  • In this work, the feasibility of spent zeolite catalyst for reusing as a support was investigated in catalytic odor removal reaction. As a model reaction for odor removal, toluene was selected as a reactant. 10wt% Cu was impregnated on spent HZSM-5 catalyst and spent FCC catalyst. The catalytic activity of the spent HZSM-S was higher than that of spent FCC catalyst in toluene oxidation. This was due to the fact that the surface area of spent HZSM-S was higher than that of spent FCC catalyst. These results may suggest that spent HZSM-S can be reused as a cheap catalyst for toluene removal.

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A Review on Recycling of Spent Autocatalyst in Korea (국내 자동차 폐촉매의 발생 및 재활용 현황)

  • Kwon, Young-Shik;Lee, Jae-Chun;Shin, Do Yun;Yi, Seung-Hoon;Kim, Hyung-Jin;Choi, Yoon-Geun
    • Resources Recycling
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    • v.23 no.1
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    • pp.3-16
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    • 2014
  • Recycling of spent autocatalyst that includes the platinum group metals (PGMs), namely palladium, platinum and rhodium, is a very profitable endeavor. In order to ensure an efficient promotion of an appropriate policy-making and the technical development of the recycling process of spent autocatalyst in Korea, the generated amount, trading conditions, and recycling technology for spent autocatalyst were surveyed. The generated amount of spent autocatalyst was estimated by analyzing the domestic statistical data of registration & disuse of automobiles and the records of autocatalyst installation to new cars. The review of the recycling technology was carried out by surveying the recycling processes of 'Heesung PMTech Ltd.', which is the largest company in the recycling industry for spent autocatalyst in Korea. In addition to the above, some policy suggestions for the improvement of recycling industries for spent autocatalyst were offered.

Regeneration of Spent Nickel Catalyst for Hydrogenation (수소화 반응용 니켈 폐촉매의 재생)

  • 전종기;박영권;김주식
    • Resources Recycling
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    • v.13 no.3
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    • pp.27-36
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    • 2004
  • Nickel oxide was recovered through roasting of a spent catalyst for hydrogenation reaction. Nickel on Kieselguhr catalysts were prepared by a precipitation method after a treatment of the recovered-nickel oxide with an acid. Effects of roasting temperature of the spent catalyst on recovery of nickel oxide was investigated. Most of nickel oxide could be recovered through roasting of the spent catalyst at $1000^{\circ}C$. In regeneration of catalysts by the precipitation method after the treatment of nickel oxide with an acid, the effect of promoter, precipitation condition and reduction condition on catalytic performance in vegetable oil hydrogenation were investigated. The addition of CaO or $Ce_2$$O_3$ resulted in an increase of catalytic activity.

A basic study on the recovery of Ni, Cu, Fe, Zn ions from wastewater with the spent catalyst (폐산화철촉매에 의한 폐수중 Ni, Cu, Fe, Zn이온 회수에 관한 기초연구)

  • Lee Hyo Sook;Oh Yeung Soon;Lee Woo Chul
    • Resources Recycling
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    • v.13 no.2
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    • pp.3-8
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    • 2004
  • A basic study on the recovery of heavy metals such as Zn, Ni, Cu and Fe ions from wastewater was carried out with the spent iron oxide catalyst, which was used in the Styrene Monomer(SM) production company. The heavy metals could be recovered more than 98% with the spent iron oxide catalyst. The alkaline components of the spent catalyst could be precipitated the metal ions of the wastewater as metal hydroxides at the higher pH 10.6 in Ni, pH 8.0 in Cu, pH 6.5 in Fe, pH 8.5 in Zn. But the metal ions are adsorbed physically on the surface of the spent catalyst in the range of the pH of the metal hydroxides and pH 3.0, which is the isoelectric point of the iron oxide catalyst.

Physical and Chemical Characteristics of Waste Automotive Catalysts (자동차 폐촉매의 물리 화학적 특성)

  • Seo, Seong-Gyu;Moon, Joung-Sun
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.5
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    • pp.819-825
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    • 2000
  • The physico-chemical characteristics and the combustion activities of a waste automotive catalyst were carried out in this study. The physico-chemical characteristics of waste automotive catalyst was examined by EA(Elemental analysis), ICP-AES (Inductively coupled plasma-atomic emission spectrophotometer), and XRD(X-ray diffraction) analysis. Carbon deposit amount was higher in front brick than rear brick of catalyst, and increased with mileage. The content of Pt. Pd and Rh in waste automotive catalyst was different from the car manufacturing company. The combustion activities of waste automotive catalyst were investigated for acetaldehyde as a model VOC in a fixed bed reactor at atmospheric pressure. The catalytic activity of rear brick for acetaldehyde combustion was better than front brick of waste automotive catalyst. The catalytic activity of waste automotive catalyst for acetaldehyde combustion decreased with mileage. The linear relationship between catalytic activity and mileage was negative and has a very excellent correlation. Finally, the waste automotive catalyst has a good catalytic activity for acetaldehyde combustion. and can be used to control of small emission source.

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Catalytic Oxidation of Volatile Organic Compounds Over Spent Three-Way Catalysts (배기가스 정화용 폐 자동차 촉매를 이용한 휘발성 유기화합물의 제거)

  • Shim, Wang Geun;Kim, Sang Chai
    • Applied Chemistry for Engineering
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    • v.19 no.5
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    • pp.574-581
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    • 2008
  • The optimum regeneration conditions for the regeneration of three way spent catalysts (TWCs), which were taken from automobiles with different driving conditions, were investigated to evaluate the suitability as alternative catalysts for removing VOCs. The spent catalysts were washed with five different acids ($HNO_3$, $H_2SO_4$, $C_2H_2O_4$, $C_6H_8O_7$, and $H_3PO_4$) to remove contaminants and examine the optimum conditions for recovering the catalytic activity. The physicochemical properties of spent and its regenerated TWCs were evaluated by using nitrogen adsorption-desorption isotherms, XRD, and ICP. The relative atomic ratios of contaminants and platinum group metals (PGMs) of the spent TWCs were greatly dependent on the placed positions. The main contaminants formed were lubricant oil additives and metallic components. Also, the regeneration treatment increased the PGMs ratio, BET surface area, and average pore diameter of TWCs. The catalytic activity results indicated that the spent TWCs have the possibility for removing VOCs. Moreover, the employed acid treatments greatly enhanced the catalytic activity of the spent TWCs. Especially, nitric and oxalic acids provided the most improvement in the catalytic behavior. The catalytic activities of the regenerated TWCs were significantly influenced by the containing platinum ratios rather than the removal ratios of contaminants and the changes in the structural properties offered by the acid treatments.

A Study on the Remanufacturing Effect of Aged Three-Way Catalysts (사용후 가솔린 자동차 삼원촉매의 재제조 효과 고찰)

  • Kwak, Seung-Min;Lim, Jong-Sun;Kim, Tae-Won;Park, Hae-Kyoung
    • Applied Chemistry for Engineering
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    • v.20 no.4
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    • pp.430-436
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    • 2009
  • Deactivated three-way catalysts which had been exposed to gasoline engine exhaust for a long time were remanufactured by ultra sonic cleaning with distilled water, sulfuric acid solution and impregnation with precious metals (Pt, Pd, Rh). The catalytic properties as well as conversion reactivity of CO, THC and NOx about fresh, aged and remanufactured catalysts were examined. Most of the pollutants deposited on the aged three-way catalysts were removed in the remanufacturing process of those catalysts. At the same time a little amount of precious metals like Pt and Pd were removed in the remanufacturing process. Under the experimental condition used in this study, in the case of the remanufactured catalysts with impregnation of precious metals, the catalytic activities were recovered to almost the same level, or higher level of that of the fresh catalyst.

The study of characterization of extracted vanadium in waste catalyst for vanadium redox flow battery (폐촉매에서 추출한 바나듐 레독스 흐름전지용 바나듐의 특성 연구)

  • Kang, Ung Il
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.10
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    • pp.598-602
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    • 2018
  • This study examined the characteristics of the waste catalyst used in the petroleum refinery operations. The total pore volume, specific surface area, and average pore size of the spent catalyst used in the petroleum refinery operations were 3.96cc/g, 13.81m2/g, and 1.15A, respectively. The weight loss observed in the range from $25^{\circ}C-700^{\circ}C$ for the spent catalysts using TG and DTA was approximately 23 wt. %. EDS analysis of the waste catalyst sample showed that the five major components were vanadium, nickel, manganese, iron, and copper. The extraction system is attractive for liquid-liquid extraction. In this study, Cynex 272 was used to extract vanadium from waste catalyst. The electrochemical characteristics of the extracted vanadium solution were measured by cyclic voltammetry (CV). As a result, an oxidation / reduction peak appeared, indicating the potential of an electrolytic solution.

The Effects of Zeolite-Type Catalysts on the Pyrolysis Reaction of PP to Produce Fuel-oil (폴리프로필렌 수지 이용 연료유 생성을 위한 열분해 반응에서 제올라이트계 촉매의 영향)

  • Bak, Young-Cheol;Choi, Joo-Hong;Oh, Se-Hui
    • Korean Chemical Engineering Research
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    • v.50 no.3
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    • pp.442-448
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    • 2012
  • The effects of zeolite-type catalysts addition on the thermal decomposition of the PP resin have been studied in a thermal analyzer, a Pyrolyser GC-mass, and a small batch reactor. The zeolite type catalysts tested were natural zeolite, used FCC catalyst, and ZSM-5. As the results of TGA experiments, the pyrolysis starting temperature for PP varied in the range of $330{\sim}360^{\circ}C$ according to the heating rate. Addition of the zeolite type catalysts in the PP resin increased the pyrolysis rate in the order of used FCC catalyst> natural zeolite> ZSM-5 > PP resin. Adding the used FCC catalyst in the PP reduced most effectively the pyrolysis finishing temperature. In the PY-G.C. mass experiments, addition of zeolite type catalysts decreased the molecular weight of pyrolyzed product. In the batch system experiments, the mixing of used FCC catalyst enhanced best the initial yield of fuel oil, but the final yield of fuel oil was 2% higher in the case of mixing of natural zeolite. Also in the carbon number analysis, used FCC catalyst was the most useful one in this experiments for fuel oil.

Environmental analysis on Waste Catalyst Recycling Technology using Life Cycle Assessment (전과정평가를 통한 폐촉매 재활용 기술의 환경성 분석)

  • Ahn, Joong Woo;Pak, Jong-Jin
    • Resources Recycling
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    • v.27 no.1
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    • pp.64-73
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    • 2018
  • This study aims to analysis the environmental impact on waste catalyst recycling technology using entire life cycle assessment. Environmental impacts consist of the five categories of impacts: global warming, resource depletion, acidification, eutrophication, and photochemical oxide production. The waste catalyst recycling presently have a GWP 3.53 ton $CO_2$ equivalent/ton, a ADP 0.017 ton Sb equivalent/ton, a AP 0.051 $SO_2$ equivalent/ton, a EP 0.0092 $PO{_4}^{3-}$ equivalent/ton, a 0.0019 ton $C_2H_4$ equivalent/ton. The smelting reduction process is the greatest contributor to all categories of environmental impacts in waste catalyst recycling. Electricity used in the smelting reduction process is the major contributor of all impact categories.