Adsorption/desorption behavior of carbonyl sulfide gas on Scheelite type MWO4 adsorbent

Kim, Junyeong; Yeon, Jeong; Park, No‐Kuk; Hong, Jin Woo; Kang, Misook

doi:10.1016/j.seppur.2018.06.040

Cited by 18 publications

(3 citation statements)

References 45 publications

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“…Carbonyl sulfide (COS), as an organic odorless, tasteless, and colorless sulfur compound, is widely present in raw materials and industrial waste gases. − COS may cause serious harm to human health, with the minimum lethal concentration of 204–400 mg/m 3 . Also, it brings severe issues to industrial production and the environment. − When COS exists in the feedstocks, it can lead to serious deactivation of catalysts and the corrosion of production equipment. , COS has to be removed from most gaseous industrial products such as blast-furnace gas, coke oven gas, natural gas, shale gas, and so forth before they are transported to the downstream users. − However, it is pretty difficult to remove COS by using the conventional wet or dry desulfurization process due to its stable chemical properties, weak acidity, and low reactivity. Several COS removal methods including hydrogenolysis, hydrolysis, oxidation, and adsorption have been established.…”

Section: Introductionmentioning

confidence: 99%

Catalysts of Ordered Mesoporous Alumina with a Large Pore Size for Low-Temperature Hydrolysis of Carbonyl Sulfide

Jin

Qi-chao

et al. 2021

Energy Fuels

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Carbonyl sulfide (COS) generated from various chemical and metallurgical industry sectors has been receiving considerable attention due to its environmental impact and threat to production chains. The catalytic hydrolysis of COS has been considered an economic way for converting the unremovable COS into H 2 S that subsequently can be easily removed through the mature wet or dry desulfurization process. Searching for an effective catalyst with stable activity is always crucial for COS hydrolysis. In this study, alkali-free ordered mesoporous Al 2 O 3 with a larger pore size, incorporated with Ni, Cu, or Fe as an additive, and synthesized via a one-pot approach has been investigated for the catalytic hydrolysis of COS at low temperatures. It has been demonstrated that alumina with ordered mesoporous structures exhibits significant catalytic activity over COS hydrolysis whose activity improved further when incorporated with transition metals. More importantly, the enlargement of mesopore size for all the catalysts is critical for maintaining their catalytic performance. By optimizing the pore size and the type of additive, a highly active and stable catalyst of Ni-containing mesoporous Al 2 O 3 with a large pore size has been established, which exhibits a long-term COS conversion above 95% and strong sulfur resistance. With the help of various characterization techniques, the details of the hydrolysis reaction, as well as the sulfur poisoning mechanism, have been revealed. It is envisaged that the synthesized catalyst of alkali-free ordered mesoporous Al 2 O 3 holds great application potential for the catalytic hydrolysis of COS in practical industrial applications.

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Section: Introductionmentioning

confidence: 99%

Catalysts of Ordered Mesoporous Alumina with a Large Pore Size for Low-Temperature Hydrolysis of Carbonyl Sulfide

Jin

Qi-chao

et al. 2021

Energy Fuels

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“…There have been a number of synthetic routes reported for the preparation of MgWO 4 nanostructures, including but not limited to the hydrothermal/solvothermal method, microwave-assisted reactions, the solid-state process and flux growth techniques, in addition to electrospinning and calcination-based protocols [4–12]. Use of these different procedures has led to the generation of various discrete and distinctive shapes, including nanowires [11], irregular nanoparticles[13,14], bulk formulations [4,10,15], nanosheets [6,8], nanoparticles [16], nanorods [3,8,17], wool balls [8,16] and stars [8,9]. In addition, it has been reported that both the monoclinic wolframite and the triclinic crystal phases of these metal tungstates can be produced, most frequently under high-temperature annealing conditions [6,8,11,13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the photoluminescent properties, scintillation behaviour and toxicological profile of various magnesium tungstate nanoscale motifs

et al. 2022

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We have synthesized several morphologies and crystal structures of MgWO 4 using a one-pot hydrothermal method, producing not only monoclinic stars and large nanoparticles but also triclinic wool balls and sub-10 nm nanoparticles. Herein we describe the importance of reaction parameters in demonstrating morphology control of as-prepared MgWO 4 . Moreover, we correlate structure and composition with the resulting photoluminescence and radioluminescence properties. Specifically, triclinic-phase samples yielded a photoluminescence emission of 421 nm, whereas monoclinic-phase materials gave rise to an emission maximum of 515 nm. The corresponding radioluminescence data were characterized by a broad emission peak, located at 500 nm for all samples. Annealing the wool balls and sub-10 nm particles to transform the crystal structure from a triclinic to a monoclinic phase yielded a radioluminescence (RL) emission signal that was two orders of magnitude greater than that of their unannealed counterparts. Finally, to confirm the practical utility of these materials for biomedical applications, a series of sub-10 nm particles, including as-prepared and annealed samples, were functionalized with biocompatible PEG molecules, and subsequently were found to be readily taken up by various cell lines as well as primary cultured hippocampal neurons with low levels of toxicity, thereby highlighting for the first time the potential of this particular class of metal oxides as viable and readily generated platforms for a range of biomedical applications.

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“…To prevent equipment damage and catalyst empoisoning in various processes such as methane reforming and oil refining, the efficient removal of COS can be achieved by adsorption using aqueous solutions of various alkanolamines . The removal of COS and reducing its emission have aroused much attention. − The knowledge of Gibbs free energy plays an important role for understanding adsorbate–adsorbent interactions. A higher negative value of the change in the Gibbs free energy implies a more energetically favorable adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Predictions of Entropy and Gibbs Energy for Carbonyl Sulfide

Jia

Wang

Wei³

et al. 2019

ACS Omega

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Many chemical and physical equilibrium conditions can be determined from minimizing the Gibbs free energies of the system. Efficient analytical representations of the entropy and Gibbs free energy of carbonyl sulfide remain elusive in the communality of science and engineering. Here, we report two analytical representations of the entropy and Gibbs free energy for carbonyl sulfide, and the prediction procedures only involve six molecular constants of the carbonyl sulfide molecule. In the temperature range from 300 to 6000 K, the average relative deviations of the predicted molar entropy and reduced Gibbs free energy values of carbonyl sulfide from the National Institute of Standards and Technology database are arrived at 0.150 and 0.189%, respectively.

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Adsorption/desorption behavior of carbonyl sulfide gas on Scheelite type MWO4 adsorbent

Cited by 18 publications

References 45 publications

Catalysts of Ordered Mesoporous Alumina with a Large Pore Size for Low-Temperature Hydrolysis of Carbonyl Sulfide

Catalysts of Ordered Mesoporous Alumina with a Large Pore Size for Low-Temperature Hydrolysis of Carbonyl Sulfide

Investigation of the photoluminescent properties, scintillation behaviour and toxicological profile of various magnesium tungstate nanoscale motifs

Predictions of Entropy and Gibbs Energy for Carbonyl Sulfide

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