An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

Rivero-Mendoza, Daniel E.; Stanley, Jessica N. G.; Scott, Jason; Aguey‐Zinsou, Kondo‐François

doi:10.3390/catal6110170

Cited by 41 publications

(30 citation statements)

References 48 publications

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“…The selectivity of catalysts is slightly changed after introduction of cerium. The observed changes of the activity of promoted catalysts are consistent with recently published data[32][33][34][35][36]. An increased activity of Ce and La promoted nickel catalysts has been often attributed…”

supporting

confidence: 91%

“…Such discrepancy may result from limited accessibility of surface sites and partial coverage of nickel crystallites by the support. in the literature to the improved nickel dispersion and changes of the acid-base properties of catalysts [32][33][34][35][36]. Figure 3 shows the results of durability studies of catalysts in CO 2 methantion reaction performed at 475 °C.…”

Section: Properties Of Catalysts Determined Prior To the Co 2 Methanamentioning

confidence: 99%

“…Nickel dispersion has been also improved by the use of suitable promoters and modifiers, e.g. Ce [29][30][31][32], La [33][34][35][36][37], Mo [38], W [39], Mn [40], Fe [41][42][43]. Hydrogen sulfide (H 2 S) is found to be the most unfavorable component of biogas.…”

Section: Introductionmentioning

confidence: 99%

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CO2 Methanation in the Presence of Ce-Promoted Alumina Supported Nickel Catalysts: H2S Deactivation Studies

et al. 2019

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The performance of alumina supported unpromoted and cerium promoted nickel catalysts in CO 2 methanation reaction was investigated. It was found that the activity of catalysts in CO 2 methanation reaction at low reaction temperatures can be improved by the increase in nickel loading and introduction of cerium promoter. The catalysts showed high resistance for sintering and coking at high reaction temperatures. A few stages of catalysts deactivation by H 2 S in the methanation reaction carried out at 475 °C with the time on stream were identified. It was found that an introduction of H 2 S to the stream (8 ppm) did not induce rapid decrease of activity. Slight and then strong drop of CO 2 conversion and simultaneously the loss of methane selectivity was observed after specific time, depending on the catalysts composition. Deactivation of catalysts was related to the nickel content and the presence of cerium. X-ray diffraction studies indicated small changes of crystallite size with the time on stream. Raman spectroscopy studies pointed out that deactivation of catalysts was not connected with formation of carbon deposits. An in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy studies showed that exposition of catalysts to the reaction mixture containing the traces of H 2 S led to the blocking of nickel active sites responsible for CO 2 and H 2 activation and successive transformation to carbonyl and formate species.

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supporting

confidence: 91%

Section: Properties Of Catalysts Determined Prior To the Co 2 Methanamentioning

confidence: 99%

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CO2 Methanation in the Presence of Ce-Promoted Alumina Supported Nickel Catalysts: H2S Deactivation Studies

et al. 2019

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“…Recently, Rivero-Mendoza et al reported La-Ni/γ-Al 2 O 3 catalytic activity relative to the Sabatier reaction [112], where catalytic studies coupled with in situ DRIFTS analyses provide insights on the CO 2 methanation mechanism. The activation process of the catalyst promotes formation of oxidized Ni particles (Ni 2+ ) decorated with LaO x moieties.…”

Section: Alumina-supported Nickelmentioning

confidence: 99%

Supported Catalysts for CO2 Methanation: A Review

et al. 2017

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CO 2 methanation is a well-known reaction that is of interest as a capture and storage (CCS) process and as a renewable energy storage system based on a power-to-gas conversion process by substitute or synthetic natural gas (SNG) production. Integrating water electrolysis and CO 2 methanation is a highly effective way to store energy produced by renewables sources. The conversion of electricity into methane takes place via two steps: hydrogen is produced by electrolysis and converted to methane by CO 2 methanation. The effectiveness and efficiency of power-to-gas plants strongly depend on the CO 2 methanation process. For this reason, research on CO 2 methanation has intensified over the last 10 years. The rise of active, selective, and stable catalysts is the core of the CO 2 methanation process. Novel, heterogeneous catalysts have been tested and tuned such that the CO 2 methanation process increases their productivity. The present work aims to give a critical overview of CO 2 methanation catalyst production and research carried out in the last 50 years. The fundamentals of reaction mechanism, catalyst deactivation, and catalyst promoters, as well as a discussion of current and future developments in CO 2 methanation, are also included.

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“…Methane (CH 4 ), the main constituent of natural gas plays an increasingly important role in meeting future global energy demands [1]. It is widely used in various applications such as electrical power generation and other heating applications.…”

Section: Introductionmentioning

confidence: 99%

Active and Stable Methane Oxidation Nano-Catalyst with Highly-Ionized Palladium Species Prepared by Solution Combustion Synthesis

et al. 2018

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We report on the synthesis and testing of active and stable nano-catalysts for methane oxidation. The nano-catalyst was palladium/ceria supported on alumina prepared via a one-step solution-combustion synthesis (SCS) method. As confirmed by X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HTEM), SCS preparative methodology resulted in segregating both Pd and Ce on the surface of the Al 2 O 3 support. Furthermore, HTEM showed that bigger Pd particles (5 nm and more) were surrounded by CeO 2 , resembling a core shell structure, while smaller Pd particles (1 nm and less) were not associated with CeO 2 . The intimate Pd-CeO 2 attachment resulted in insertion of Pd ions into the ceria lattice, and associated with the reduction of Ce 4+ into Ce 3+ ions; consequently, the formation of oxygen vacancies. XPS showed also that Pd had three oxidation states corresponding to Pd 0 , Pd 2+ due to PdO, and highly ionized Pd ions (Pd (2+x)+ ) which might originate from the insertion of Pd ions into the ceria lattice. The formation of intrinsic Ce 3+ ions, highly ionized (Pd 2+ species inserted into the lattice of CeO 2 ) Pd ions (Pd (2+x)+ ) and oxygen vacancies is suggested to play a major role in the unique catalytic activity. The results indicated that the Pd-SCS nano-catalysts were exceptionally more active and stable than conventional catalysts. Under similar reaction conditions, the methane combustion rate over the SCS catalyst was~18 times greater than that of conventional catalysts. Full methane conversions over the SCS catalysts occurred at around 400 • C but were not shown at all with conventional catalysts. In addition, contrary to the conventional catalysts, the SCS catalysts exhibited superior activity with no sign of deactivation in the temperature range between~400 and 800 • C.

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An Alumina-Supported Ni-La-Based Catalyst for Producing Synthetic Natural Gas

Cited by 41 publications

References 48 publications

CO2 Methanation in the Presence of Ce-Promoted Alumina Supported Nickel Catalysts: H2S Deactivation Studies

CO2 Methanation in the Presence of Ce-Promoted Alumina Supported Nickel Catalysts: H2S Deactivation Studies

Supported Catalysts for CO2 Methanation: A Review

Active and Stable Methane Oxidation Nano-Catalyst with Highly-Ionized Palladium Species Prepared by Solution Combustion Synthesis

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