Catalysts for conversion of synthesis gas

Palma, Vincenzo; Ruocco, Concetta; Martino, Marco; Meloni, Eugenio; Ricca, Antonio

doi:10.1016/b978-0-08-101031-0.00007-7

Cited by 8 publications

(6 citation statements)

References 233 publications

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“…16 It is possible that the interaction with silica support stabilizes the metastable W 2 C phase. 61 By varying the number of cycles, an intermediate interaction between W x C and SiO 2 exists that contributes to the best catalytic performance observed over the Rh/5c-W x C/ SiO 2 system. The Rh/2c-W x C/SiO 2 catalyst with the less distinct W x C phase shows higher selectivity toward methane (i.e., 19.1%) as compared to Rh/5c-W x C/SiO 2 (i.e., 12.6%), probably caused by increased contributions from Rh/SiO 2 .…”

Section: Resultsmentioning

confidence: 98%

“…Won et al have also reported that a catalyst which preferentially formed the W 2 C phase showed higher productivity to mixed alcohols compared to WC and WO 3 . It is possible that the interaction with silica support stabilizes the metastable W 2 C phase . By varying the number of cycles, an intermediate interaction between W x C and SiO 2 exists that contributes to the best catalytic performance observed over the Rh/5c-W x C/SiO 2 system.…”

Section: Results and Discussionmentioning

confidence: 98%

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Synthesis Gas Conversion over Rh-Mn-W_xC/SiO₂ Catalysts Prepared by Atomic Layer Deposition

et al. 2018

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The catalytic conversion of synthesis gas to value-added oxygenates and light hydrocarbons was studied on Rh and Rh−Mn clusters on tungsten carbide-overcoated silica (W x C/SiO 2 ) at 523 K, 580 psi, and CO/H 2 = 1/1. The W x C-modified SiO 2 support was prepared by the overcoating of WO x on SiO 2 using atomic layer deposition (ALD) followed by carburization. The reactivities of Rh/W x C/SiO 2 catalysts with varying number of ALD cycles (number of cycles = 2, 5, 10, 20, and 30) were measured and showed that 5 ALD cycles of W x C suppressed the formation of methane. All W x C-modified catalysts showed enhancement in selectivity toward methanol and ethanol through CO hydrogenation and acetaldehyde hydrogenation, respectively. These catalysts also improved the overall turnover frequency (TOF). The addition of Mn species further promoted the activity and the selectivity toward ethanol and C 2+ hydrocarbons, especially light alkenes. The best performing Rh-2Mn/5cycle-W x C/SiO 2 catalyst (Rh:Mn molar ratio = 1:2) achieved 84.7% selectivity toward valuable oxygenates and C 2+ hydrocarbons with a ratio of alkenes to alkanes equal to 1.7, compared to Rh/SiO 2 which exhibited 80.4% selectivity toward the products aforementioned with a ratio of 0.5. The overall TOF was 20 times higher than that over Rh/SiO 2 (i.e., 5.6 × 10 −2 s −1 vs 2.9 × 10 −3 s −1 ). X-ray diffraction revealed that the existence of W 2 C, which was the dominant phase in Rh/5cycle-W x C/SiO 2 , favored the suppression of methane and enhanced the production of alcohols and C 2+ hydrocarbons compared to the WC support. Density functional theory calculations for Rh 19 , Rh 31 , and Rh 37 clusters on various WC surfaces suggested that the shape of Rh clusters is condition dependent and subject to H 2 pressure. The C-and O-binding energies on various sites for the clusters were used with scaling relations to probe their catalytic activity. With the use of this approach, the increase in the O binding energy when moving from the SiO 2 -supported Rh 37 cluster to the WC-supported cluster leads to an increase in the activity of Rh/W x C/SiO 2 at the expense of the reduction in the number of sites that are selective toward C 2 oxygenates.

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Section: Resultsmentioning

confidence: 98%

Section: Results and Discussionmentioning

confidence: 98%

Synthesis Gas Conversion over Rh-Mn-W_xC/SiO₂ Catalysts Prepared by Atomic Layer Deposition

et al. 2018

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“…Thermal catalytic degradation of NH 3 occurs primarily through the opposite NH 3 formation mechanism. Dolomite and iron-based low-cost catalysts can successfully remove up to 70-80% of NH 3 from syngas (Palma et al, 2017). Nibased low-cost catalyst has also shown promising results, and capable of removing up to 75% of NH 3 (Palma et al, 2017).…”

Section: Nitrogen Compoundsmentioning

confidence: 99%

“…Dolomite and iron-based low-cost catalysts can successfully remove up to 70-80% of NH 3 from syngas (Palma et al, 2017). Nibased low-cost catalyst has also shown promising results, and capable of removing up to 75% of NH 3 (Palma et al, 2017). However, deactivation of sulphur is a big concern associated with these catalysts.…”

Section: Nitrogen Compoundsmentioning

confidence: 99%

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A review on the production of renewable aviation fuels from the gasification of biomass and residual wastes

Shahabuddin

Alam

Krishna

et al. 2020

Bioresource Technology

204

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre -including this research content -immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Biochar as a Catalytic Material

Singh

2021

Catalysis for Clean Energy and Environmental Sustainability

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Catalysts for conversion of synthesis gas

Cited by 8 publications

References 233 publications

Synthesis Gas Conversion over Rh-Mn-W_xC/SiO₂ Catalysts Prepared by Atomic Layer Deposition

Synthesis Gas Conversion over Rh-Mn-W_xC/SiO₂ Catalysts Prepared by Atomic Layer Deposition

A review on the production of renewable aviation fuels from the gasification of biomass and residual wastes

Biochar as a Catalytic Material

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Catalysts for conversion of synthesis gas

Cited by 8 publications

References 233 publications

Synthesis Gas Conversion over Rh-Mn-WxC/SiO2 Catalysts Prepared by Atomic Layer Deposition

Synthesis Gas Conversion over Rh-Mn-WxC/SiO2 Catalysts Prepared by Atomic Layer Deposition

A review on the production of renewable aviation fuels from the gasification of biomass and residual wastes

Biochar as a Catalytic Material

Contact Info

Product

Resources

About

Synthesis Gas Conversion over Rh-Mn-W_xC/SiO₂ Catalysts Prepared by Atomic Layer Deposition

Synthesis Gas Conversion over Rh-Mn-W_xC/SiO₂ Catalysts Prepared by Atomic Layer Deposition