The Utilization of Catalyst Sorbent in Scrubbing Acid Gases from Incineration Flue Gas

Wey, Ming‐Yen; Lu, Chi-Yuan; Tseng, Hui‐Hsin; Fu, Cheng-Hao

doi:10.1080/10473289.2002.10470790

Cited by 15 publications

(12 citation statements)

References 24 publications

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“…22 Earlier work has established that CeO 2 is the most active phase in the catalytic reaction, because it effectively increases O 2 storage capacity, even though noble metals are used as catalysts. 23,24 CeO 2 in a Cu catalyst may be assumed to promote the generation of the active phase of CuO under the conditions of NH 3 oxidation. X-ray powder diffraction confirmed the formation of CuNO 3 and CeO 2 active sites, at least synergistically affecting the Cu-Ce composite catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…Ce stabilizes the washcoat layer, increases the thermal resistance, enhances the catalytic activity of precious metals, and enables the storage of O 2 . [21][22][23][24] However, the feasibility of using a copper (Cu)-Ce composite catalyst to determining the reactive properties of these active metals in the SCO process seldom has been addressed. This work addresses the activity of the Cu-Ce composite catalyst in the oxidation of NH 3 , as determined by various parameters, and its effect on the removal of NH 3 from an effluent stream using the SCO process.…”

Section: M)mentioning

confidence: 99%

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Selective Catalytic Oxidation of Ammonia over Copper-Cerium Composite Catalyst

Lou

Hung

Yang

2004

Journal of the Air & Waste Management Association

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This work considers the oxidation of ammonia (NH 3 ) by selective catalytic oxidation (SCO) over a copper (Cu)-cerium (Ce) composite catalyst at temperatures between 150 and 400°C. A Cu-Ce composite catalyst was prepared by coprecipitation of copper nitrate and cerium nitrate at various molar concentrations. This study also considers how the concentration of influent NH 3 (500 -1000 ppm), the space velocity (72,000 -110,000 hr Ϫ1 ), the relative humidity (12-18%) and the concentration of oxygen (4 -20%) affect the operational stability and the capacity for removing NH 3 . The effects of the O 2 and NH 3 content of the carrier gas on the catalyst's reaction rate also are considered. The experimental results show that the extent of conversion of NH 3 by SCO in the presence of the Cu-Ce composite catalyst was a function of the molar ratio. The NH 3 was removed by oxidation in the absence of Cu-Ce composite catalyst, and ϳ99.2% NH 3 reduction was achieved during catalytic oxidation over the Cu-Ce (6:4, molar/molar) catalyst at 400°C with an O 2 content of 4%. Moreover, the effect of the initial concentration and reaction temperature on the removal of NH 3 in the gaseous phase was also monitored at a gas hourly space velocity of less than 92,000 hr ؊1 .

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Section: Resultsmentioning

confidence: 99%

Section: M)mentioning

confidence: 99%

Selective Catalytic Oxidation of Ammonia over Copper-Cerium Composite Catalyst

Lou

Hung

Yang

2004

Journal of the Air & Waste Management Association

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“…In correspondence, since 1990 the TEPA has devised the construction of a number of MSW incinerators to solve the MSW problem. By 2007, Taiwan has 22 MSW incineration refuse plants in operation. The volume of MSW materials and the treatment rate by incineration in 2006 are 7,336,496 tons and 53.34%, respectively, [9].…”

Section: Introductionmentioning

confidence: 99%

The prospect and development of incinerators for municipal solid waste treatment and characteristics of their pollutants in Taiwan

Kuo

Tseng

Rao

et al. 2008

Applied Thermal Engineering

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Taiwan is a small, densely populated island with unique experiences in the construction and operation of incinerators. In such a small area. Taiwan has built 22 incinerators over a short span of time, combusting large amount of municipal solid waste as much as 23,250 tons per day. This study focuses on the history of construction and development of incinerators in Taiwan its well as the characteristics of pollutants. such its heavy metals (Pb, Cd, and Hg), acid gases (NOx, SOx, CO, and HCl), and dioxins emitted from the incinerators. Further-more, the study also covers the generation and composition of municipal solid waste (MSW), and the production of energy in Taiwan. According to Taiwan's data on pollutant emissions, the emission level of pollutants is under control and meets the stringent regulations of Taiwan Environmental Protection Administration (TEPA). Researches have shown that using air pollution control devices (APCDs) in the operation of incinerators provides effective measures for air pollutant control in Taiwan. The main advantage of using incinerators is the generation of electricity (waste-to-energy) during the incineration of municipal solid waste, producing energy that can be consumed by the general public and the industry. Taiwan's extensive experience in incinerator construction and operation may serve as an example for developing countries in devising waste treatment technology, energy recovery, and the control of contagious viral diseases. (C) 2008 Elsevier Ltd. All results reserve

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“…9 Conventionally, the ␥-Al 2 O 3 catalyst support is prepared from bauxite directly or from the monohydrate by dehydration or recrystallization at elevated temperature. 10 Relatively small surface area and poor attrition resistance are the two major drawbacks of the adsorbents prepared by conventional methods.…”

Section: Introductionmentioning

confidence: 99%

Copper Loaded on Sol-Gel-Derived Alumina Adsorbents for Phosphine Removal

Hsu

Bai

et al. 2010

Journal of the Air & Waste Management Association

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The hydride gas of phosphine (PH 3 ) is commonly used for semiconductor and optoelectronic industries. The local scrubbers must immediately abate it because of its high toxicity. In this study, copper (Cu) loaded on the sol-gelderived ␥-alumina (Al 2 O 3 ) adsorbents are prepared and tested to investigate the possibility of PH 3 removal and sorbent regeneration. Test results showed that during the breakthrough time of over 99% PH 3 removal efficiency, the maximum adsorption capacity of Cu loaded on the sol-gel-derived ␥-Al 2 O 3 adsorbent is 18 mg-PH 3 /gadsorbent. This is much higher than that of Cu loaded on the commercial ␥-Al 2 O 3 adsorbent-8.6 mg-PH 3 /gadsorbent. The high specific surface area, narrow pore size distribution, and well dispersion of Cu loaded on the sol-gel-derived ␥-Al 2 O 3 could be the reasons for its high PH 3 adsorption capacity. The regeneration test shows that Cu loaded on the sol-gel-derived ␥-Al 2 O 3 adsorbent can be regenerated after a simple air purging procedure. The cumulative adsorption capacity for five regeneration cycles is 65 mg-PH 3 /g-adsorbent, which is approximately double that of the Cu/zeolite adsorbent demonstrated in the literature. INTRODUCTIONThe hydride gas of phosphine (PH 3 ) is used in large quantity for semiconductor, liquid crystal display (LCD), and light-emitting diode (LED) manufacturing industries in various processes. The unutilized PH 3 gas must be abated right after the process tool because of its high toxicity and flammability. In addition, the PH 3 gas is thought to be an airborne molecular contaminant (AMC), which decreases the product yield. Dry chemical adsorption is a preferred method used for hazardous gas removals from these manufacturing factories. It can treat PH 3 effectively, 1-3 especially when the PH 3 coexists with arsine (AsH 3 ) in the exhaust gases. However, commercialized dry chemical adsorbents cannot be reused and they must be treated as hazardous wastes. Thus it is essential to develop a regenerative adsorbent for reducing the amount of hazardous waste production.Earlier researchers 4 treated PH 3 by carbon dry adsorption. The capacity of activated carbon (AC) can reach approximately12 mg-PH 3 /g-AC at 140°C 5 ; however, its disadvantage is its inflammability. 6 The spent carbon might react exothermically with air and result in spontaneous combustion. Thus the AC adsorbent is not practically acceptable in abating the toxic hydride gases for the semiconductor and optoelectronic industries. Li et al. 7 used metal (Cu, Zn, or Mn)-loaded ZSM-5 and Y zeolite adsorbents for the adsorption of PH 3 toxic gas. Their results showed that more than 99% PH 3 adsorption efficiency was achieved when zeolites were loaded with Cu. However, they also revealed that PH 3 removal efficiencies

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The Utilization of Catalyst Sorbent in Scrubbing Acid Gases from Incineration Flue Gas

Cited by 15 publications

References 24 publications

Selective Catalytic Oxidation of Ammonia over Copper-Cerium Composite Catalyst

Selective Catalytic Oxidation of Ammonia over Copper-Cerium Composite Catalyst

The prospect and development of incinerators for municipal solid waste treatment and characteristics of their pollutants in Taiwan

Copper Loaded on Sol-Gel-Derived Alumina Adsorbents for Phosphine Removal

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