Deactivation mechanism of Ni supported on Mg-Al spinel during autothermal reforming of model biogas

Luneau, Mathilde; Gianotti, Elia; Meunier, Frédéric; Mirodatos, C.; Puzenat, E.; Schuurman, Y.; Guilhaume, N.

doi:10.1016/j.apcatb.2016.10.023

Cited by 47 publications

(23 citation statements)

References 30 publications

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“…Moreover, as Ni is placed on the filament top, it is difficult to regenerate the catalytic system because the contact between metal and support is lost [23,24]. This deteriorates the attrition resistance of the catalyst and limits its applicability in fluidized catalytic reactors.…”

Section: Introductionmentioning

confidence: 99%

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Charisiou

Tzounis

Sebastián

et al. 2019

Applied Surface Science

146

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catalysts were investigated for the biogas reforming reaction using CH 4 /CO 2 mixtures with minimal dilution. Stability tests at various reaction temperatures were conducted and TGA/DTG, Raman, STEM-HAADF, HR-TEM, XPS techniques were used to characterize the spent samples. Graphitized carbon allotrope structures, carbon nanotubes (CNTs) and amorphous carbon were formed on all samples. Metallic Ni 0 was recorded for all (XPS), whereas a strong peak corresponding to Ni 2 O 3 /NiAl 2 O 4 , was observed for the Ni/Al sample (650-750°C). Stability tests confirm that the Ni/LaAl catalyst deactivates at a more gradual rate and is more active and selective in comparison to the Ni/Al for all temperatures. The Ni/LaAl exhibits good durability in terms of conversion and selectivity, whereas the Ni/Al gradually loses its activity in CH 4 and CO 2 conversion, with a concomitant decrease of the H 2 and CO yield. It can be concluded that doping Al 2 O 3 with La 2 O 3 stabilizes the catalyst by (a) maintaining the Ni 0 phase during the reaction, due to higher dispersion and stronger active phase-support interactions, (b) leading to a less graphitic and more defective type of deposited carbon and (c) facilitating the deposited carbon gasification due to the enhanced CO 2 adsorption on its increased surface basic sites.

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Section: Introductionmentioning

confidence: 99%

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Charisiou

Tzounis

Sebastián

et al. 2019

Applied Surface Science

146

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“…The main challenge of DRM is related to the catalytic deactivation, together with side reactions such as reserve water-gas-shift reaction (RWGS). The deactivation is mostly due to coke deposition and catalyst modification (active phase and/or support) at high temperature [12][13][14][15]. Thus, much work was devoted to the development of new performing catalysts to prevent catalytic deactivation.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Phan

Sane

Vasconcelos

et al. 2018

Applied Catalysis B: Environmental

135

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A B S T R A C T Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has all the criteria of a catalyst support, in particular its high thermal stability. However it is still less studied in the heterogeneous catalysis. For the first time, hydroxyapatite supported bimetallic Co-Ni catalysts were prepared and evaluated in the dry reforming of methane (DRM) process. Nanoparticles containing both nickel and cobalt were well formed on the surface of HAP by conventional impregnation methods. No modification of HAP structure was observed after metals deposition. DRM reaction was carried out at 700-750°C and around 1.6 bar, using a fixed-bed reactor which was fed with a mixture of 20%vol CH 4 , 20%vol CO 2 and 60%vol N 2 . CH 4 and CO 2 conversion reached up to 60 and 68% at 700°C, respectively, and 73 and 79% at 750°C, respectively during long reaction times of 50-160 h. Water as a by-product could be quantified along the catalytic reaction indicating the implication of reverse water-gas-shift reaction. TEM-EDX analysis of the used catalysts recovered after catalytic tests showed that coke deposition was limited and there was slight modification of metals particle size. The results obtained were very promising for the design of an efficient catalytic system for DRM process.

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“…Из сепаратора газ поступает в холодильник (5). Количество синтетического газа регистрируется с помощью газового счетчика (6). По достижении заданной температуры отбиралась проба газа для проведения хроматографического анализа.…”

Section: экспериментальная частьunclassified

“…Одна из важнейших химических реакции, пригодная для промышленного получения синтез-газа является углекислотная конверсия метана [5][6][7]:…”

Section: Introductionunclassified

Получение Синтез-Газ Газификацией Угля И Углекислотной Конверсией Метана. Процесс Фишера-Тропша

Досумов¹,

Ергазиева²,

Ermagambet³

et al. 2019

Горение и Плазмохимия

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В статье рассматриваются способы получения синтез-газа газификацией угля, углекислотной конверсией метана и производство жидких углеводородов методом Фишера-Тропша. Установлено, что при газификации угля в плотном слое прямым методом, при температуре 900 оС наблюдается образование синтезгаза с соотношением Н2:СО равным 1,8:1,0. При углекислотной конверсии метана на катализаторе 5 мас.% NiO-MoO3/Al2O3 при температуре реакции 800 оС, с соотношением СН4:СО2 в исходной реакционной смеси равной 3:1 можно получить синтез-газ состава 2:1. Определено, что в интервале температур 250-350 оС и давлении 5 атм. в присутствии катализатора CuO –ZnO/СаА синтез-газ с соотношением 2:1 (Н2:СО) конвертируется в жидкие углеводороды (метанол, этанол и диметиловый эфир). Выход жидких углеводородов составляет 10-15 об.%.

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Deactivation mechanism of Ni supported on Mg-Al spinel during autothermal reforming of model biogas

Cited by 47 publications

References 30 publications

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Investigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Получение Синтез-Газ Газификацией Угля И Углекислотной Конверсией Метана. Процесс Фишера-Тропша

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