Ni-Mn-Al catalysts obtained from layered double hydroxides for CO2 hydrogenation

被引:0
|
作者
Polycarpo, Joana Mara [1 ]
Torquato, Mattheus [2 ]
Zotin, Fatima Maria Zanon [1 ]
Rangel, Maria do Carmo [3 ]
Faro, Arnaldo da Costa [4 ]
Palacio, Luz Amparo [1 ]
机构
[1] Univ Estado Rio de Janeiro, Inst Quim, Rua Sao Francisco Xavier 524, BR-20550013 Rio De Janeiro, RJ, Brazil
[2] Inst Nacl Tecnol, Ctr Caracterizacao Nanotecnol Mat & Catalise CENAN, Ave Venezuela, 82-518, BR-20081312 Rio De Janeiro, Brazil
[3] Univ Fed Rio Grande do Sul, Inst Quim, Ave Bento Goncalves 9500, BR-90650001 Porto Alegre, RS, Brazil
[4] Univ Fed Rio de Janeiro, Inst Quim, Ave Athos Silveira Ramos 149-302-A, BR-21941909 Rio De Janeiro, RJ, Brazil
来源
MOLECULAR CATALYSIS | 2025年 / 578卷
关键词
Ni-Mn-Al mixed oxides; Layered Double Hydroxides; Methanation; CO; 2; valorization; CARBON-DIOXIDE; IN-SITU; THERMAL-BEHAVIOR; METHANATION; TEMPERATURE; COPPER; KINETICS; NANOCATALYSTS; PERFORMANCE; PRECURSORS;
D O I
10.1016/j.mcat.2025.114965
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
It is widely agreed among researchers that global warming is directly linked to increased concentrations of carbon dioxide (CO2) in the atmosphere. As such, technologies aimed at reducing CO2 emissions have been extensively studied. In this study, bimetallic (Ni-Mn, Ni-Al, Mn-Al) and trimetallic (Ni-Mn-Al) precursors were synthesized by a coprecipitation method to obtain layered double hydroxides (LDH). Preparation of the studied catalysts is easily scalable, due to the relative simplicity and reproducibility of LDH synthesis. The effects of pH and molar proportion of the metals on their physical and chemical properties were evaluated. After calcination and in-situ reduction, the oxides were evaluated as catalysts in the CO2 hydrogenation reaction, which is a possible alternative to the abatement of global warming. It was concluded that Mn increased the specific surface area of the oxides and the content of basic sites in the catalyst, as well as facilitated the onset of the materials reduction. The most active catalyst, obtained at lower pH, had only 6 mol% Mn and showed CO2 conversion and CH4 selectivity equal to 82 % and 100 % at 350 degrees C, respectively. It was also stable during 16 h on stream, at the temperature of maximum conversion. At low temperatures, this catalyst was one of the best reported in the literature, with CO2 conversion and CH4 selectivity of 40 % and 100 % at 225 degrees C, respectively. Additionally, 50 % conversion was achieved at 248 degrees C (T50). At temperatures higher than 400 degrees C, the reverse water gas shift reaction, which competes with methanation, was inhibited in solids with higher Mn contents (>= 40 mol%).
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页数:14
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