Effects of MoO3 loading and calcination temperature on the activity of the sulphur-resistant methanation catalyst MoO3/γ-Al2O3

Wang, Baowei; Ding, Guangya; Shang, Yuguang; Lv, Jing; Wang, Haiyang; Wang, Erdong; Li, Zhenhua; Ma, Xinbin; Qin, Shaodong; Sun, Qi

doi:10.1016/j.apcata.2012.04.029

Cited by 89 publications

(38 citation statements)

References 38 publications

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“…Therefore, MoS 2 ‐based catalysts can be directly used for converting the syngas without undergoing any deep desulfurization. In fact, a low content of the sulfur in syngas is usually required to maintain the stability of MoS 2 ‐based catalysts via replenishing the leached sulfur from the catalyst . For CO hydrogenation reactions, the MoS 2 ‐catalyzed synthesis of methanol, higher alcohols, methane, and light olefins has been reported from the sulfur‐containing syngas, and the product selectivity is highly dependent on both promoters and operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of olefins, favorable conditions are slightly higher temperature of 360–400 °C and clearly lower pressure of 1.0–4.0 MPa ,,. If the desired product is methane, a wide range of temperatures (350–500 °C) and pressures (1.0–4.0 MPa) is commonly employed ,. If the alkali metal as a promoter is added to MoS 2 based catalysts, the product selectivity is significantly changed .…”

Section: Introductionmentioning

confidence: 99%

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The Active Nature of Crystal MoS₂ for Converting Sulfur‐Containing Syngas

et al. 2019

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Molybdenum disulfides are attractive sulfur-tolerant catalysts suitable for the direct conversion of sulfur-containing syngas, which avoids the expensive step of the deep desulfurization. However, the catalytic activity of MoS 2 -based catalysts is relatively low. To improve the activity, previous works have focused on modifying MoS 2 with various promoters and supports, but the structural aspects are largely overlooked. In this work, we investigated the active nature of the MoS 2 -based catalysts for the catalytic hydrogenation of carbon monoxide. Thus, the bulk MoS 2 with varied crystallite sizes was synthesized by the hydrothermal and the thermal decomposition methods. The catalysts before and after catalytic tests were characterized by in-situ X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscope techniques. The CO hydrogenation under low-temperature methanation conditions (The syngas with a H 2 /CO = 2 and 40.0 ppm H 2 S, T = 360°C, and P = 2 MPa) was applied to evaluate MoS 2 as a catalyst for converting syngas. The catalytic results indicate that the MoS 2 with smaller crystallite sizes exhibited a higher CO conversion. By correlating the structural propriety with the catalytic activity, a hexagonal-prim-shaped model was developed to describe different sites on the MoS 2 crystallite. Based on this model, the activity of different active sites on the bulk MoS 2 for CO hydrogenation decreased in the order of rim sites > edge sites @ basal sites. The highest catalytic activity over the bulk MoS 2 with smallest particles was attributed to the highest exposure of the rim sites.[a] Dr.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Active Nature of Crystal MoS₂ for Converting Sulfur‐Containing Syngas

et al. 2019

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“…Because of its catalytic properties and excellent resistance to sulphur poisoning, molybdenum disulphide could be a potential candidate for valorisation of biosyngas. Moreover, the presence of sulphur in syngas is often even required for the stable catalyst operation [10]. Extremely low sulphur concentration in syngas could lead to sulphur loss in the catalysts and subsequent deactivation.…”

Section: Introductionmentioning

confidence: 99%

“…Extremely low sulphur concentration in syngas could lead to sulphur loss in the catalysts and subsequent deactivation. On the non-promoted MoS 2 catalysts, syngas is mainly transformed to methane [7,10] which is a relatively inexpensive reaction product.…”

Section: Introductionmentioning

confidence: 99%

Impact of potassium content on the structure of molybdenum nanophases in alumina supported catalysts and their performance in carbon monoxide hydrogenation

Liu

Virginie

Griboval-Constant

et al. 2015

Applied Catalysis A: General

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“…On the contrary, silicon‐based ordered mesoporous materials, such as MCF SBA‐15, MCM‐41, or KIT‐6, have been widely reported; however, on these materials, metal particles tend to migrate from the mesoporous channels to the external surface at high temperatures due to the weak metal–support interaction, resulting in severe sintering of metals and decreased activity. On the contrary, the ordered mesoporous alumina (OMA) has a strong interaction with the metal species, and the OMA catalyst can effectively restrain the sintering of active metal nanoparticles in a fixed space. Yuan et al prepared highly long‐range ordered mesoporous alumina by a solvent evaporation‐induced self‐assembly (EISA) method, which had excellent thermal stability and could maintain high ordered mesoporous structure at 1000 °C.…”

Section: Introductionmentioning

confidence: 99%

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

et al. 2020

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To address the problems of sintering of Ni particles and poor low‐temperature activity of Ni‐based catalysts for CO methanation, MoOx‐doped (x < 3) ordered mesoporous Ni/Al2O3 catalysts are prepared by two different methods, including the impregnation method and evaporation‐induced self‐assembly (EISA) method. The samples before and after the catalytic reaction are thoroughly characterized by scanning electron microscopy and transmission electron microscopy. The ordered mesoporous structure is retained in all catalysts, whereas the ones prepared by the EISA method demonstrate high specific surface area, small Ni particle size, and high metal dispersion. After reduction in H2 flow, the Mo promoter is in the form of MoOx (x < 3) with the mixed valence of Mo (IV) and Mo (VI), which can increase the density of Ni atomic electron clouds and reduce the Ni particle size. The optimal mesoporous Ni‐Mo/Al2O3 catalyst reaches the maximum CO conversion and CH4 yield of 97.9% and 93.8%, respectively, at 375 °C, 0.1 MPa, and a weight hourly space velocity of 60 000 mL g−1 h−1. In addition, this catalyst demonstrates excellent stability in 100 h‐lifetime test at high space velocity owing to the confinement of the ordered mesoporous structure and the addition of MoOx promoter.

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Effects of MoO3 loading and calcination temperature on the activity of the sulphur-resistant methanation catalyst MoO3/γ-Al2O3

Cited by 89 publications

References 38 publications

The Active Nature of Crystal MoS₂ for Converting Sulfur‐Containing Syngas

The Active Nature of Crystal MoS₂ for Converting Sulfur‐Containing Syngas

Impact of potassium content on the structure of molybdenum nanophases in alumina supported catalysts and their performance in carbon monoxide hydrogenation

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

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Effects of MoO3 loading and calcination temperature on the activity of the sulphur-resistant methanation catalyst MoO3/γ-Al2O3

Cited by 89 publications

References 38 publications

The Active Nature of Crystal MoS2 for Converting Sulfur‐Containing Syngas

The Active Nature of Crystal MoS2 for Converting Sulfur‐Containing Syngas

Impact of potassium content on the structure of molybdenum nanophases in alumina supported catalysts and their performance in carbon monoxide hydrogenation

MoOx‐Doped Ordered Mesoporous Ni/Al2O3 Catalyst for CO Methanation

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The Active Nature of Crystal MoS₂ for Converting Sulfur‐Containing Syngas

The Active Nature of Crystal MoS₂ for Converting Sulfur‐Containing Syngas

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation