• Title, Summary, Keyword: Waste Catalyst

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Physicochemical Characteristics of Waste Catalyst and Their In-Process Products from Recycling (폐촉매 및 재활용 중간생성물의 물리화학적 특성 평가)

  • Park, Joon-Seok;Jeun, Byung-Do;Kim, Joung-Dae
    • Journal of Environmental Health Sciences
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    • v.37 no.2
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    • pp.150-158
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    • 2011
  • This research was conducted to estimate the physicochemical characteristics of waste catalyst and its in-process product from recycling and to suggest fundamental data for religious systems such as quality standards. Mo and V contents were increased from the waste catalyst to calcinated material and oxidized material. In the results of a heavy metals leaching test, Pb was not detected in any catalyst, calcinated and oxidized materials. Cu was not detected in the catalyst. However, it was detected in ${\leq}$1.16 mg/l for calcinated material and in 1.34~13.73 mg/l for $MoO_3$ oxidezed material. Concentrations in recycling in-process products (calcinated and oxidized materials) were higher than those of waste catalyst. Oil content of catalyst waste ranged from 0.01-14.03 wt%. Oil contents of calcinated and oxidized materials were greatly decreased compared to the catalyst waste. Carbon and sulfur contents as chemical poisoning material of catalyst waste ranged from 0.33-76.08 wt% and 5.00-22.00 wt%, respectively. The carbon contents of calcinated and oxidized materials showed below 20 wt%. The sulfur content showed below 8wt% for calcinated material and below 0.22 wt% for oxidized material.

Pretreatment Effect of Waste Automotive Catalysts for VOCs Combustion (VOCs 연소를 위한 자동차 폐촉매의 전처리 효과)

  • 문정선
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.2
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    • pp.191-198
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    • 2000
  • For a characterization of the pretreated waste automotive catalyst the following analysis techniques were applied : EA(Elemental Analysis) BET(Brunaure-Emmett-Teller) and ICP-AES(Inductively Coupled Plasma-Atomic Emission Spectrometry). The combustion activity of waste automotive catalyst was investigated for methanol acetaldehyde and toluene as model VOCs in a fixed bed reactor. carbon deposit amount was decreased with increasing catalyst showed a good catalytic activity for VOCs combustion at 40$0^{\circ}C$. Catalytic activity for methanol acetaldehyde and toluence combustion was very excellent and decreased with mileage. The catalytic activity of a waste automotive catalyst for methanol combustion increased after acid treatment. The acid effect of catalytic activity was summarized as follows: HNO3>HCI>H2SO4>CH3COOH. The waste automotive catalyst regenerated by the pretreatment method might have a excellent catalytic activity for VOCs combustion.

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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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Hydrocracking of waste lubricant into gasoline fraction over CoMo catalyst supported on mesoporous carbon from bovine bone gelatin

  • Pongsendana, Marthinus;Trisunaryanti, Wega;Artanti, Farin Windy;Falah, Iip Izul;Sutarno, Sutarno
    • Korean Journal of Chemical Engineering
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    • v.34 no.10
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    • pp.2591-2596
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    • 2017
  • The hydrocracking of waste lubricant into gasoline fraction was carried out using CoMo catalyst supported on mesoporous carbon. The carbon was synthesized using bovine bone gelatin and SBA-15 as a template. The metals were loaded onto the carbon by wet impregnation method. The total metal content of catalyst was prepared into two different amounts which were labelled as CoMo/MCG1 and CoMo/MCG2. Catalytic activity and selectivity were evaluated in hydrocracking of waste lubricant at 450, 475, and $500^{\circ}C$, and lubricant/catalyst weight ratio of 50, 100, 200, 300, and 400. The result revealed that acidity and specific surface area of the catalyst played an important role in determining the catalytic performance in the hydrocracking of waste lubricant. The highest percentage of gasoline fraction was 58.09%, produced by hydrocracking of waste lubricant at $475^{\circ}C$ and lubricant/catalyst weight ratio of 300 using CoMo/MCG2 catalyst.

Removing Volatile Organic Compound using the Waste Industrial Catalyst - The effect of pretreatment on Pt-based catalyst (폐 산업용 촉매를 이용한 휘발성유기화합물의 제거 -Pt 계 촉매의 전처리 효과-)

  • 김상채;서성규
    • Journal of Korean Society for Atmospheric Environment
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    • v.18 no.3
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    • pp.205-212
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    • 2002
  • The catalytic combustion of benzene, toluene and xylene over Pt-based catalyst was investigated in a fixed bed flow reactor system with atmospheric pressure to recycle the waste industrial catalyst for the processes of removing volatile organic compounds. According to the pretreatment condition, the properties of the waste Pt-based catalyst were characterized by XRD (X-ray diffraction) and BET (Brunauer-Emmett-Toller). In the carte of air pretreatment, 20$0^{\circ}C$ was found to be optimal, and increasing pretreatment temperature resulted in the reduction of the catalytic activity. When Pt-based catalyst pretreated at 20$0^{\circ}C$ by alto was retreated by hydrogen, the catalytic activity increased by increasing treatment temperature. In the case of HNO$_3$aqueous solution pretreatment, the catalytic activity decreased by increasing the concentration of HNO$_3$aqueous solution. The catalytic activity was seen to observe the following sequence : benzene > toluene > xylene.

Recovery of Nickel from Spent Petroleum Catalyst by Hydrometallurgical Process (습식제련공정에 의한 석유화학 폐촉매로부터 니켈의 회수)

  • Kim, Jong-Hwa;Song, Ju-Yeong;Yang, Seok-Jin;Jeon, Sung-Gyun
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.3
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    • pp.273-281
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    • 2010
  • Nickel recovery method was studied by the wet process from the catalyst used in hydrogenation process. Nickel content in waste catalyst was about 16%. At the waste catalyst leaching system by the alkaline solution, selective leaching of nickel was possible by amine complex formation reaction from ammonia water and ammonium chloride mixed leachate. The best leaching condition of nickel from mixed leachate was acquired at the condition of pH 8. LIX65N as chelating solvent extractant was used to recover nickel from alkaline leachate. The purity of recovered nickel was higher than 99.5%, and the whole quantity of nickel was recovered from amine complex.

Esterification of the Soybean Oil and Waste Vegetable Oil by Solid Catalysts (고체 촉매를 이용한 대두유와 폐식용유의 에스테르화)

  • Sin, Yong Seop
    • Journal of Environmental Science International
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    • v.13 no.1
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    • pp.79-87
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    • 2004
  • Esterification of soybean oil with methanol was investigated. First of all, liquid-liquid equilibriums for systems of soybean oil and methanol were measured at temperatures ranging from 40 to 65$^{\circ}C$. Profiles of conversion of soybean oil with time were determined from the glycerine content in reaction mixtures for the different kinds of catalysts, such as NaOH, CaO, Ca(OH)$_2$, MgO, Mg(OH)$_2$, and Ba(OH)$_2$. The effects of dose of catalyst, cosolvent and reaction temperature on final conversion were examined. Esterification of waste vegetable oil with methanol was investigated and compared to the case of soybean oil. Solubility of methanol in soybean oil was substantially greater than that of soybean oil in methanol. When the esterification reaction of soybean oil was catalyzed by solid catalyst, final conversion was strongly dependent on the alkalinity of the solid catalyst, and increased with the alkalinity of the metal. Hydroxides from the alkali metals were more effective than oxides. When Ca(OH)$_2$ was used for the esterification catalyst, maximum value of final conversion was measured at dose of 4%. When CHCl$_3$ as a cosolvent, was added into the reaction mixture of soybean oil which catalyzed by Ba(OH)$_2$, maximum value of final conversion was appeared at dose of 3%. When waste vegetable oil was catalyzed by NaOH and solid catalysts, high final conversion, over 90%, and fast reaction rate were obtained.

Biodiesel Production from Waste Cooking Oil Using Alkali Catalyst and Immobilized Enzyme 1. Fatty Acid Composition (알칼리 촉매와 고정화 효소를 이용한 폐식용유로 부터 바이오 디젤 생산 1. 지방산 조성)

  • Shin, Choon-Hwan
    • Journal of Environmental Science International
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    • v.19 no.10
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    • pp.1247-1256
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    • 2010
  • Since biodiesel as bioenergy is defined as ester compounds formed by esterification of animal/vegetable oils, in this study three vegetable cooking oils (market, waste and refined waste ones) were esterified by reactions of alkali catalyst and immobilized enzyme. The fatty acid composition of the formed ester compounds was analyzed to investigate the feasibility of biodiesel production. By lipolysis (i.e, hydrolysis of Triglyceride (TG)), all three vegetable oils used in this study were found to produce Diglyceride (DG), Monoglyceride (MD) and Fatty acid ethylester (FAEE). However, the amount of produced FAEE (which can be used as an energy source) was in the increasing order of market cooking oil, waste one and refined waste one. With NaOH catalyst, FAEE was produced about 24.92, 17.63 and 11.31 % for the respective oils while adding Lipozyme TL produced FAEE about 43.54, 38.16 and 24.47 %, respectively. This indicates that enzyme catalyst is more effective than alkali one for transesterification. In addition, it was found that the composition of fatty acids produced by hydrolysis of TG was unchanged with alkali and immobilized enzyme reactions. Thus it can be expected that stable conditions remain in the course of mixing with gasoline whose composition is similar to that of the fatty acids.

TREATMENT OF PHENOL CONTAINED IN WASTE WATER USING THE HETEROGENIZED FENTON SYSTEM

  • Kim, Seong-Bo
    • Environmental Engineering Research
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    • v.12 no.1
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    • pp.30-35
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    • 2007
  • Fenton system using homogeneous iron catalyst is very powerful in the degradation of organic compounds, but has a disadvantage to remove Fe ions from water after wastewater treatment. Thus, iron catalyst was bounded to support such as inorganic and polymer materials. The PVP supporting iron catalyst showed a good catalytic performance in degradation of phenol contained in waste water and iron catalyst supported on ${SO_4}^{2-}$ type PVP (KEX 511) showed the best catalytic performance. Also, reaction kinetic study was carried out in this system. Reaction constants on various catalysts was obtained from the pseudo first order equation. Reaction rate constants with the heterogenized $FeCl_2/PVP$ catalyst is a three-fold smaller than that of $FeCl_2$ 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.