Mercury oxidation by hydrochloric acid over a VO /TiO2 catalyst

Kamata, Hiroyuki; Ueno, Seıjı; Naito, Toshiyuki; Yamaguchi, Akimasa

doi:10.1016/j.catcom.2008.06.010

Cited by 64 publications

(43 citation statements)

References 14 publications

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“…One study reported Hg el oxidation of 90% when vanadium content was 1.1-1.2 wt.-% and less than 40% when the content was 0.5 wt.-% [3]. Kamata et al [24] observed an increase in Hg el oxidation almost linearly with VO x loadings up to 10 wt.-%. Vanadia-based SCR catalysts were tested at temperatures above 300 °C, temperatures which are consistent with the SCR conditions in coal fired power plants.…”

Section: Influence Of Catalyst Composition Temperature and Space Velmentioning

confidence: 99%

“…This mechanism does not seem to be the most likely in the light of more recent findings. Senior [91] [23,24,72,73]. He et al [23] proposed that Hg el oxidation over SCR catalysts occurs via a Langmuir-Hinshelwood mechanism.…”

Section: Mechanismmentioning

confidence: 99%

“…Evidence of HCl adsorption on the catalyst surface was obtained by employing different surface analysis methods [23][24][25]. Following the reaction between HCl and the V 2 O 5 active sites on the catalyst surface, several vanadyl oxychloride complexes such as VOCl 2 , V 2 O 3 (OH) 2 Cl 2 , VO 2 Cl 2 are formed [23,24].…”

Section: Eley-rideal Mechanismmentioning

confidence: 99%

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Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

2012

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Abstract:The removal of mercury from flue gases in scrubbers is greatly facilitated if the mercury is present as water-soluble oxidized species. Therefore, increased mercury oxidation upstream of scrubber devices will improve overall mercury removal. For this purpose heterogeneous catalysts have recently attracted a great deal of interest. Selective catalytic reduction (SCR), noble metal and transition metal oxide based catalysts have been investigated at both the laboratory and plant scale with this objective. A review article published in 2006 covers the progress in the elemental mercury (Hg el ) catalytic oxidation area. This paper brings the review in this area up to date. To this end, 110 papers including several reports and patents are reviewed. For each type of catalyst the possible mechanisms as well as the effect of flue gas components on activity and stability are examined. Advantages and main problems are analyzed. The possible future directions of catalyst development in this environmental research area are outlined.

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Section: Influence Of Catalyst Composition Temperature and Space Velmentioning

confidence: 99%

Section: Mechanismmentioning

confidence: 99%

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Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

2012

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“…Zhang et al (2012) investigated that the double-conversion double absorption (DCDA) process in acid plant had mercury removal efficiency of over 99.0%. The catalytic mercury oxidation process took place simultaneously when SO 2 converted to SO 3 with the existence of a catalyst in the conversion tower (Kamata et al, 2008;Lee and Bae, 2009). The oxidized mercury could easily be absorbed in the sulfuric acid inside the absorption tower.…”

Section: Status Of Atmospheric Mercury Emission Control Technology Inmentioning

confidence: 99%

Current Status and Atmospheric Mercury Emissions Associated with Large-Scale Gold Smelting Industry in China

Gao

Yue

Zuo

et al. 2017

Aerosol Air Qual. Res.

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Mercury, being bound with metal concentrate, is released to atmosphere in the smelting process, and has adverse effects on surrounding ambient air quality and public health. In this study, based on literature and field investigations, onsite measurements of mercury emissions to the atmosphere for four large-scale gold smelters were estimated. Almost all of the atmospheric mercury released from the roasting pretreatment process occurred before acid plants. All the concentrations of mercury emitted from the four tested gold smelters were much lower than the emission standard of air pollutants for GB 9078-1996 Grade II level areas of 1000 µg m -3 . The speciation of Hg p took up the largest proportions for the total mercury concentrations. Because of using high mercury oxidation efficiency of double-conversion double absorption (DCDA) technology, the proportions of Hg 2+ in the exhaust flue gas was higher than Hg 0 . Average emission factors of atmospheric mercury for these four tested gold smelters were calculated to be 1.7 kg of Hg per ton gold produced, and the national total amount of mercury emitted from large-scale gold smelting industry in the year of 2014 was estimated to 639.9 kg. However, mercury emission factors obtained from present study were much lower than that in previous research. Thus, with the exact emission factor obtaining from more specific field-test data and the detailed activity data information about gold smelting industry, an accurate inventory of mercury emissions to the atmosphere from large-scale gold smelters in China can be updated in the future.

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“…MoO 3 is widely applied in, for instance, catalysts, sen-92 sors, photochromic and electrochromic materials, electrochemical 93 devices, and recording media [11,12]. While molybdenum is fre-94 quently added as a promoter to vanadium-based catalysts in the 95 selective catalytic reduction (SCR) of NOx [13] and in Hg 0 oxidation 96 [14], its catalytic oxidation activity is poor. 97 Silver has been recognized and is often used as an effective cat-98 alyst [15,16].…”

mentioning

confidence: 99%

Co-benefit of Ag and Mo for the catalytic oxidation of elemental mercury

Zhao

et al. 2015

Fuel

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Mercury oxidation by hydrochloric acid over a VO /TiO2 catalyst

Cited by 64 publications

References 14 publications

Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review

Current Status and Atmospheric Mercury Emissions Associated with Large-Scale Gold Smelting Industry in China

Co-benefit of Ag and Mo for the catalytic oxidation of elemental mercury

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