Catalytic performance of vanadia-doped alumina-pillared clay for selective oxidation of H2S

Bineesh, Kanattukara Vijayan; Kim, Moon-Il; Lee, Goo-Hwa; Selvaraj, Manickam; Park, Dae‐Won

doi:10.1016/j.clay.2012.04.023

Cited by 27 publications

(14 citation statements)

References 59 publications

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“…12,29,32 The intensity of the (001) peak was also decreased which can be attributed to the intercalation of Al into the MMT clay interlayer's, no other structural changes were observed in the XRD spectra of both the samples as rest of the peak positions remained unchanged. The average crystallite size of the Co 3 O 4 nanoparticles calculated using the scherer equation was found to be in the range of 22-50 nm.…”

Section: Resultsmentioning

confidence: 85%

Effect of Manganese Promotion on Al-Pillared Montmorillonite Supported Cobalt Nanoparticles for Fischer-Tropsch Synthesis

Ahmad¹,

Hussain²,

Muhammad³

et al. 2013

Bulletin of the Korean Chemical Society

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The effect of Mn-promotion on high surface area Al-pillared montmorillonite (AlMMT) supported Co nanoparticles prepared by hydrothermal method have been investigated. A series of different weight% Mnpromoted Co nanoparticles were prepared and characterized by XRD, TPR, TGA, BET and SEM techniques. An increase in the surface area of MMT is observed with Al-pillaring. Fischer-Tropsch catalytic activity of the as prepared catalysts was studied in a fixed bed micro reactor at 225 o C, H 2 /CO = 2 and at 1 atm pressure. The data showed that by the addition of Mn the selectivity of C 1 dropped drastically while that of C 2 -C 12 hydrocarbons increased significantly over all the Mn-promoted Co/AlMMT catalysts. The C 13 -C 20 hydrocarbons remained almost same for all the catalysts while the selectivity of C 21+ long chain hydrocarbons decreased considerably with the addition of Mn. The catalyst with 3.5%Mn showed lowest C 21+ and highest C 2 -C 12 hydrocarbons selectivity due to cracking of long chain hydrocarbons over acidic sites of MMT.

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Section: Resultsmentioning

confidence: 85%

Effect of Manganese Promotion on Al-Pillared Montmorillonite Supported Cobalt Nanoparticles for Fischer-Tropsch Synthesis

Ahmad¹,

Hussain²,

Muhammad³

et al. 2013

Bulletin of the Korean Chemical Society

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“…Hence, the activity loss is mainly due to the gradual oxidation of H 2 S into elemental sulfur and further into the sulfuric acid and sulfurous acid with time on stream on the surface of the sorbent. As a low cost and widely used sorbent, the sulfur capacity of the iron oxide sorbent is relatively lower than that of activated carbon, zeolites, and other metal based sorbents . Thus, the improvement of sulfur capacity will greatly stimulate its application.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, high H 2 S concentrations seriously affect the nervous and respiratory system of human. Many attentions have been focused on H 2 S removal from odor gas arising from sewage treatment facilities as the restrictive emission standards are enacted world widely . The removal of H 2 S with iron oxide sorbents is a classic and effective desulfurization method due to its advantages of high sulfur removal efficiency, low cost, simple operation, and no secondary waste for additional treatment .…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Properties of Iron Oxide Sorbents on Hydrogen Sulfide Removal from Odor

Zeng

Liu

Gong

et al. 2015

CLEAN Soil Air Water

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Hydrogen sulfide (H2S) removal is the key issue for the odor control of sewage treatment facilities. In this paper, the iron oxide sorbents with different surface acid–base properties were prepared by acid and base modification. Effect of surface properties of iron oxide sorbents on H2S removal was revealed by the characterization of surface pH, Fourier‐transform infrared spectroscopy, X‐ray photoelectron spectroscopy, and solid‐state NMR spectroscopy. The results show that the activity loss of the iron oxide sorbent is mainly due to the gradual oxidation of H2S into elemental sulfur and further into the sulfuric acid and sulfurous acid with time on stream. Meanwhile, the surface basic environment of base‐treated iron oxide sorbent significantly increases the H2S removal activity by suppression the formation of H2SO4 or H2SO3 during the desulfurization process. Our findings will help us to prepare novel sorbent for more effective H2S removal from, e.g., odor gas.

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“…In some studies supported catalysts that use Al 2 O 3 , SBA‐15, clays (such as layered double hydroxides and laponite), and SiC as the catalyst support materials were tested in H 2 S oxidation . In the literature, it has been emphasized that the sufficient distribution of active metals within the catalyst support is particularly important for improving catalytic activity …”

Section: Introductionmentioning

confidence: 99%

A new sol‐gel route alumina for selective oxidation of H₂S to sulphur

et al. 2019

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In this study, a new synthesis method was developed for the production of modified sol‐gel alumina (SG‐M) for the selective oxidation of H2S to elemental sulphur. The catalytic activity of this modified alumina without any active metal incorporation was then compared with the activity of commercial alumina (alumina‐com) for H2S selective oxidation. The N2 adsorption‐desorption isotherm showed that the SG‐M alumina synthesized in this work has a mesoporous structure with well‐defined hysteresis loops. Both alumina materials showed a γ‐Al2O3 crystalline phase with an amorphous structure in their crystal structure. The surface acidity of the alumina materials was determined using pyridine‐adsorbed FTIR analyses, and both alumina showed Lewis acid sites on their surfaces. The catalytic activity tests were performed at 250°C using a feed ratio of O2/H2S:0.5. The complete conversion of H2S over SG‐M was achieved during 400 minutes of reaction time. However, the commercial alumina lost its activity at earlier reaction times. Lewis acid sites and surface hydroxyl groups caused the alumina to be active in H2S selective catalytic oxidation, and the formation of Al‐S bonds, observed when the H2S conversion fell, caused a decrease in the catalytic activity of the alumina materials. A high sulphur yield (≥95%) was obtained over SG‐M, even though there was no active metal incorporation and even in the presence of excess oxygen. Considering the catalytic activities, the new sol‐gel alumina synthesized in this work is superior to commercial alumina. It was concluded that, as a catalyst without any active metal, SG‐M is a promising catalyst in H2S selective oxidation to sulphur.

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Catalytic performance of vanadia-doped alumina-pillared clay for selective oxidation of H2S

Cited by 27 publications

References 59 publications

Effect of Manganese Promotion on Al-Pillared Montmorillonite Supported Cobalt Nanoparticles for Fischer-Tropsch Synthesis

Effect of Manganese Promotion on Al-Pillared Montmorillonite Supported Cobalt Nanoparticles for Fischer-Tropsch Synthesis

Effect of Surface Properties of Iron Oxide Sorbents on Hydrogen Sulfide Removal from Odor

A new sol‐gel route alumina for selective oxidation of H₂S to sulphur

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Catalytic performance of vanadia-doped alumina-pillared clay for selective oxidation of H2S

Cited by 27 publications

References 59 publications

Effect of Manganese Promotion on Al-Pillared Montmorillonite Supported Cobalt Nanoparticles for Fischer-Tropsch Synthesis

Effect of Manganese Promotion on Al-Pillared Montmorillonite Supported Cobalt Nanoparticles for Fischer-Tropsch Synthesis

Effect of Surface Properties of Iron Oxide Sorbents on Hydrogen Sulfide Removal from Odor

A new sol‐gel route alumina for selective oxidation of H2S to sulphur

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A new sol‐gel route alumina for selective oxidation of H₂S to sulphur