Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation

Abstract

We report the simple preparation of the barium hexaaluminate (BaO?6Al 2 O 3 , BHA) with high surface area (BHA-HSA) (>100 m 2 g 21 ) through a coprecipitation method using carbon black as the hard template. Ni catalysts supported on BHA-HSA (Ni/BHA-HSA) with different NiO loadings (10, 20, and 40 wt%) were investigated in CO methanation for the production of synthetic natural gas (SNG). The CO methanation reaction was carried out at 0.1 and 3.0 MPa with a weight hourly space velocity of 30 000 mL g 21 h 21 . It was found that Ni/BHA-HSA catalysts showed increased activity at low temperature (240-400 uC) compared with more conventional Ni/BHA catalysts with the same NiO loadings. A highest CH 4 yield of 95.7% can be obtained over Ni/BHA-HSA (40 wt% of NiO loading) at 400 uC and 3.0 MPa, and a lifetime test shows that, at 500 uC and 3.0 MPa, it is more stable than Ni/BHA. The serious aggregation of Ni nanoparticles is the major reason for the deactivation of the latter. The work demonstrates that BHA-HSA can be effectively prepared using carbon black as the hard template and is more suitable as a Ni catalyst support for CO methanation.

Nickel-promoted mesoporous ZSM5 for carbon monoxide methanation

“…Due to the abundance of carbon monoxide released into the atmosphere, methanation of CO has attracted increasing attention for effectively mitigating CO buildup and recycling the carbon resource. [4][5][6][7][8][9][10] Yan et al reported the use of plasma prepared Ni/SiO2 on CO methanation. 3 In previous reports, catalytic performances for CO methanation have been mostly investigated on various supports, such as silica, alumina, and mesoporous material.…”

“…6 100% CO conversion was obtained at 623 K. On the other hand, Liu et al studied the influence of V2O3 in the catalytic performance of Ni/Al2O3 for CO methanation. 9 It gave 100% CO conversion and 95.7% CH4 yield at 673 K. In addition, Jia et al reported the improved CO methanation with the use of nickel supported on the perovskite oxide CaTiO3 (Ni/CTO). Moreover, Zhang et al reported that 10 wt% Ni-MCM-41 exhibited excellent activity and stability in the CO methanation with 95.7% CH4 yield at 623 K. 8 Besides, Gao et al prepared the high surface area Ni supported on barium hexaaluminate (Ni/BHA) for improved CO methanation compared with the conventional Ni/BHA.…”

Structure–Activity Relationships of Nickel–Hexaaluminates in Reforming Reactions Part I: Controlling Nickel Nanoparticle Growth and Phase Formation

“…Additionally, carbon selectivity is widely believed to depend on Ni nanoparticle size, with a prerequisite for larger particles to favor growth of carbon deposits such as carbon whiskers. [24][25][26][27] The potential very high specific surface area of Ba-hexaaluminates recently reported at 70-100 m 2 g À1 [28][29][30] and up to 160 m 2 g À1 [31] with calcination temperatures up to 1300 8C can offer a sufficiently large specific surface for the stabilization of Ni nanoparticles. Therefore, the influence of the mirror plane cation as well as the substitution cation concentration was investigated with four series of Ni-hexaaluminates ANi y Al 12Ày O 19Àd (A = Sr, La, Ba, and y = 0.25, 0.5, 1) that were prepared by a convenient impregnation.…”

Materiais cerâmicos catalíticos à base de hexa-aluminato de metais alcalino terrosos (Ba e Ca): síntese e análise estrutural

“…Resultados obtidos em pesquisas anteriores sobre síntese de materiais cerâmicos com estrutura de espinélio [8][9][10] mostraram que após a calcinação de um composto de aluminato de cálcio a 800 °C durante 2 h, o pó cerâmico apresentava-se amorfo; mas, ao elevar-se a temperatura de calcinação para 1000 °C, a cristalinidade aumentou consideravelmente e a fase α-Al 2 O 3 era identificada nas estruturas dos materiais obtidos. Aumentando-se a temperatura de calcinação para 1100 °C, a fase α-Al 2 [11,12].…”