High-temperature desulfurization of hot coal gas on Mo modified Mn/KIT-1 sorbents

Zhang, Z.F.; Liu, B.S.; Wang, F.; Zheng, Shuyi

doi:10.1016/j.cej.2015.02.091

Cited by 35 publications

(9 citation statements)

References 56 publications

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“…The MnSO 4 and MnS phases cannot be observed in Figure . As in former work, − MnSO 4 cannot form under high regeneration temperature and low oxygen content, and MnS in the sulfide sample can be completely regenerated at 700 °C. So, it can be believed that the sulfide sample could be regenerated completely using 5% O 2 /N 2 during the regeneration process.…”

Section: Results and Discussionmentioning

confidence: 52%

Effect of La-Modified Supporter on H₂S Removal Performance of Mn/La/Al₂O₃ Sorbent in a Reducing Atmosphere

Peng

et al. 2019

Ind. Eng. Chem. Res.

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High temperature sorbents for removing H 2 S comprising manganese oxide and Al 2 O 3 support modified with La loadings were prepared with wet impregnation. The removal of H 2 S and the regeneration of sorbents were conducted at 850 °C to investigate the effect of the support modified with La on the desulfurization ability and durability of the Mn/La/Al 2 O 3 sorbents. The fresh sorbent, first sulfide sorbent, and fourth regenerated sorbent were characterized by nitrogen isothermal adsorption, X-ray power diffraction, scanning electron microscopy, and H 2 temperature-programmed reduction. The results showed that the highest initial breakthrough sulfur capacity (BSC) was obtained with Mn/0.78%La/Al 2 O 3 (M/0.78L), and the initial BSC decreased with increased La loadings due to the inhibiting of excessive La on the reaction between MnO and H 2 S. The BSC of sorbents with lower La loadings suffered more serious deactivation than Mn x O y /Al 2 O 3 during successive desulfurization−regeneration cycles, and the BSC durability of sorbents increased with an increase in La loadings and calcination temperature of La/Al 2 O 3 . Mn/4.83%La/Al 2 O 3 with La/Al 2 O 3 calcined at 900 °C (M/4.83H) had the best BSC durability, which was better than the BSC durability of Mn x O y /Al 2 O 3 (M) during several desulfurization−regeneration cycles. The characterization results showed that the structure of the M/4.83H sorbent was more stable than other sorbents. The M/ 4.83H sorbent derived the La(AlO 3 ) phase, which could maintain the structural stability of the sorbent during several desulfurization−regeneration cycles. The formation of the LaAlO 3 phase may inhibit Mn x O y from dissolving into Al 2 O 3 , which was beneficial for the durability of sorbents during several successive desulfurization−regeneration cycles.

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Section: Results and Discussionmentioning

confidence: 52%

Effect of La-Modified Supporter on H₂S Removal Performance of Mn/La/Al₂O₃ Sorbent in a Reducing Atmosphere

Peng

et al. 2019

Ind. Eng. Chem. Res.

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“…The observable peak shifts of XPS Si2p and Al2p are related to slight differences in the chemical coordination environment. The XPS spectra from Mn2p are centered between 640-643 and 650-653 eV, and are from the Mn2p 3/2 and Mn2p 1/2 (Zhang et al, 2015; Figure 5D). According to Mn2p 3/2 peaks fitting results, multivalent Mn oxides (Mn 2+ , Mn 3+ , and Mn 4+ ) are formed in all the catalysts (Dai et al, 2012).…”

Section: Characteristics Of Catalystsmentioning

confidence: 99%

Catalytic Ozonation of Nitrobenzene by Manganese-Based Y Zeolites

Nan

et al. 2020

Front. Chem.

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Catalytic ozonation process (COP) is considered as a cost-efficient technology for the treatment of refractory chemical wastewaters. The catalyst performance plays an important role for the treatment efficiency. The present study investigated efficiencies and mechanisms of manganese (Mn)-based Y zeolites in COPs for removing nitrobenzene from water. The catalysts of Mn/NaY and Mn/USY were prepared by incipient wetness impregnation, while Mn-USY was obtained by hydrothermal synthesis. Mn-USY contained a greater ratio of Mn 2+ than Mn/NaY, and Mn/USY. Mn oxides loaded on Y zeolites promoted the COP efficiencies. Mn/NaY increased total organic carbon removal in COP by 7.3% compared to NaY, while Mn/USY and Mn-USY increased 11.5 and 15.8%, respectively, relative to USY in COP. Multivalent Mn oxides (Mn 2+ , Mn 3+ , and Mn 4+ ) were highly dispersed on the surface of NaY or USY, and function as catalytic active sites, increasing mineralization. Mn-USY showed the highest total organic carbon removal (44.3%) in COP among the three catalysts, because Mn-USY had a higher ratio of Mn 2+ to the total Mn oxides on the surface than Mn/NaY and Mn/USY and the catalytic effects from intercorrelations between Mn oxides and mesoporous surface structures. The hydroxyl radicals and superoxide radicals governed oxidations in COP using Mn-USY. Nitrobenzene was oxidized to polyhydroxy phenol, polyhydroxy nitrophenol, and p-benzoquinone. The intermediates were then oxidized to small organic acids and ultimately carbon dioxide and water. This study demonstrates the potential of Y zeolites used in COP for the treatment of refractory chemical wastewaters.

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“…Mesoporous silica is used as a carrier of metals and metal oxides due to its structure with available pores of a uniform size and a high surface area; it enables a selective adsorption of contaminants [7,27]. The following absorbents may serve as examples: NiO-CeO 2 /Al 2 O 3 -SiO 2 , which shows high efficiency of H 2 S adsorption and is used for desulfurization of Jet-A kerosene at ambient conditions [28] as well as the commercial ZnO/SBA-15 and Mn-Cu/SBA-1 [27]. Also, manganese oxide with molybdenum added may be used during desulfurization processes [27].…”

Section: Sorbents Used For Biogas Desulfurizationmentioning

confidence: 99%

“…The following absorbents may serve as examples: NiO-CeO 2 /Al 2 O 3 -SiO 2 , which shows high efficiency of H 2 S adsorption and is used for desulfurization of Jet-A kerosene at ambient conditions [28] as well as the commercial ZnO/SBA-15 and Mn-Cu/SBA-1 [27]. Also, manganese oxide with molybdenum added may be used during desulfurization processes [27]. In the temperature range of 400-1000°C it has the highest initial rate of H 2 S removal, compared with oxides of Cu, Zn, Mn, Fe, V, Mo, W, Co, Ca, Sr, and Ba.…”

Section: Sorbents Used For Biogas Desulfurizationmentioning

confidence: 99%

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Sorbents Used for Biogas Desulfurization in the Adsorption Process

Kwaśny¹,

Balcerzak²

2016

Pol. J. Environ. Stud.

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High-temperature desulfurization of hot coal gas on Mo modified Mn/KIT-1 sorbents

Cited by 35 publications

References 56 publications

Effect of La-Modified Supporter on H₂S Removal Performance of Mn/La/Al₂O₃ Sorbent in a Reducing Atmosphere

Effect of La-Modified Supporter on H₂S Removal Performance of Mn/La/Al₂O₃ Sorbent in a Reducing Atmosphere

Catalytic Ozonation of Nitrobenzene by Manganese-Based Y Zeolites

Sorbents Used for Biogas Desulfurization in the Adsorption Process

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High-temperature desulfurization of hot coal gas on Mo modified Mn/KIT-1 sorbents

Cited by 35 publications

References 56 publications

Effect of La-Modified Supporter on H2S Removal Performance of Mn/La/Al2O3 Sorbent in a Reducing Atmosphere

Effect of La-Modified Supporter on H2S Removal Performance of Mn/La/Al2O3 Sorbent in a Reducing Atmosphere

Catalytic Ozonation of Nitrobenzene by Manganese-Based Y Zeolites

Sorbents Used for Biogas Desulfurization in the Adsorption Process

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Effect of La-Modified Supporter on H₂S Removal Performance of Mn/La/Al₂O₃ Sorbent in a Reducing Atmosphere

Effect of La-Modified Supporter on H₂S Removal Performance of Mn/La/Al₂O₃ Sorbent in a Reducing Atmosphere