NOx reduction by CO over ASC catalysts in a simulated rotary reactor: Effect of reaction conditions

Sun, Peiliang; Cheng, Xingxing; Wang, Zhiqiang; Lai, Yanhua; Ma, Chunyuan; Chang, Jiang

doi:10.1016/j.joei.2018.04.009

Cited by 14 publications

(12 citation statements)

References 39 publications

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“…Nitrogen oxides, such as NO and NO 2, commonly known as NOx are usually emitted from the consumption of fossil fuel in power generation and industrial production, endanger life and pose a threat to the environment [1, 2]. NO x has been considered one of the major air pollutants, which do not only harm the human body, but also trigger a series of serious environmental problems like global warming, photochemical smog, ozone depletion, and respiratory diseases [3, 4, 5]. NOx further reacts with OH − radicals in the atmosphere to form nitric acid, thereby producing acid rain [6].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

Kartohardjono

Merry

Rizky

et al. 2019

Heliyon

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Emissions of nitrogen oxides such as NO and NO2, which are commonly known as NOx, are threats to human existence and cause environmental problems. Mainly, two techniques have been developed to drastically reduce these emissions, which are dry and wet processes. The wet process has several advantages, major identifiable advantages are the adaptability to the flue gas, low operating temperatures and no poisoning and inactivation catalyst. Also, a mixture of hydrogen peroxide and nitric acid are used as absorbents solution for NOx reduction in the wet process. The advantages of using this mixture include the ability to reduce the negative effect of NOx and does not contaminate the scrubbing solution. In addition, nitric acid has an economical advantage in the process considering the fact that it is produced in the process. Finally, it can be conducted at ambient temperature. This study furthermore used a mixture of hydrogen peroxide and nitric acid solutions as an absorbent to reduce NOx in hollow fiber membrane modules. The hydrogen peroxide oxidized HNO2 to nitric acid, while enhances the oxidation through an autocatalytic reaction. The effects of the feed gas flow rate, hydrogen peroxide concentrations and number of fibers on the NOx reduction, absorbed NOx and flux were varied to study. The experimental results showed that the increase in the feed gas flow rate from 100 to 200 mL/min decreased NOx reduction from about 98 to 94% but increased the absorbed NOx and flux from about 0.13 to 0.255 mmol/h and 0.85–1.63 mmol/m2.h, respectively The increase in proportion of NOx in the feed gas effect was dominant than the increase in absorbed NOx. An increase in hydrogen peroxide concentration from 0.5 to 10 wt.% in the absorbent solutions increased NOx reduction, absorbed NOx and flux from about 94 to 98%, 0.257–0.267 mmol/h and 1.09–1.13 mmol/m2.h, respectively. Additionally, the H2O2 plays an important role in enhancing HNO2 oxidation to HNO3. Furthermore, an increase in the number of fibers from 50 to 150 in the membrane module increased NOx reduction and absorbed NOx from 86 to 97% and 0.23–0.27 mmol/h. Flux decreased from 2.98 to 1.13 mmol/m2.h due to increment in the gas-liquid contact surface area.

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Section: Introductionmentioning

confidence: 99%

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

Kartohardjono

Merry

Rizky

et al. 2019

Heliyon

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“…However, the effect of H 2 O was considered to be reversible. 17 Previous studies of our group 14,18 also found that H 2 O had obvious inhibitory effect on CO deNO x process over activated semi coke catalysts, but the mechanism was rarely reported.…”

Section: Introductionmentioning

confidence: 99%

NO_xreduction by CO over ASC catalysts in a simulated rotary reactor: effect of CO₂, H₂O and SO₂

et al. 2018

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“…Furthermore, 49% of NOx comes from motor vehicles, 27% comes from the activities of the electricity generation industry, and 19% comes from household activities. NOx has also been reported to have the ability to cause acid rain, form fog fumes, decrease water quality, destroy ecosystems, and contribute to global warming (Choi et al, 2014;Gao et al, 2018;Kartohardjono et al, 2019a;Sun et al, 2019). In addition, NOx is also having harmful effect on the human being (Kartohardjono et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

Kartohardjono¹,

Rizky

Karamah³

et al. 2020

IJTech

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As a type of gas that contributes to air pollution, nitrogen oxide (NOx) has harmful effects on humans and the environment. Among several types of NOx, nitric oxide (NO) and nitrogen dioxide (NO2) are most commonly found in air. The utilization of membranes as reactors is a system that combines chemical reactions with the separation process through membranes to increase the conversion of the reaction. This study investigated the absorption process by utilizing a hollow fiber membrane module (polysulfone) as a bubble reactor with H2O2 (0.5 wt.%) and HNO3 (0.5M) as the absorbent. NOx feed gas was flown into the tube side of the membrane; the shell side was filled with static H2O2 and HNO3 and the shell input and the tube output flow were closed to create gas bubbles. The experimental results showed that the absorption efficiency increased, but the mass transfer coefficient and flux decreased as the number of fibers in the membrane module increased at the same feed gas flow rate. The NOx loading is relatively constant as the amount of fiber in the membrane module increased at the same feed gas flow rate. The experimental results also showed that the mass transfer coefficient, flux, and NOx loading increased with increasing feed gas flow rate, but the absorption efficiency decreased when using the same number of fibers in the membrane module. The maximum NOx absorption efficiency achieved in this study was 94.6% at the feed gas flow rate of 0.1 L/min, using a membrane module with 48 fibers.

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NOx reduction by CO over ASC catalysts in a simulated rotary reactor: Effect of reaction conditions

Cited by 14 publications

References 39 publications

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

NO_xreduction by CO over ASC catalysts in a simulated rotary reactor: effect of CO₂, H₂O and SO₂

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

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NOx reduction by CO over ASC catalysts in a simulated rotary reactor: Effect of reaction conditions

Cited by 14 publications

References 39 publications

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

NOxreduction by CO over ASC catalysts in a simulated rotary reactor: effect of CO2, H2O and SO2

The Effect of the Number of Fibers in Hollow Fiber Membrane Modules for NOx Absorption

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NO_xreduction by CO over ASC catalysts in a simulated rotary reactor: effect of CO₂, H₂O and SO₂