| Title |
A method for preparing a ni-based methanation catalyst on a Porous clay heterostructure support with a high specific Surface area, and a ni-based methanation catalyst thus Obtained |
| Authors |
Tamosiunas, Andrius ; Lukosiute, Stase Irena ; Baltusnikas, Arunas ; Cesniene, Jurate ; Zakarauskas, Kestutis ; Striugas, Nerijus |
| Full Text |
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| Abstract [eng] |
The invention relates to a method for preparing a Ni-based methanation catalyst deposited on a porous clay heterostructure support with a high specific surface area (PCH-HSA) formed by a chemical method. During the first step of the synthesis, modification of sodium bentonite with quaternary ammonium salt with molecule of branched structure, high molecular weight, and long alkyl chains (C16-C18) is performed. The modifier is intercalated into the interlayer space of silicate (sodium bentonite) and expands the distance between the tetrahedral layers up 3.9 nm. At the second step, long alkyl chain primary neutral amine (C18) together with silicate source (tetraethylorthosilicate) is intercalated to the expanded interlayer of the modified silicate. Hydrolysis and polycondensation reaction of silicate source take place. PCHHSA precursor is formed which is calcined at 640 oC for 5 hours. After the calcination, the PCH-HSA catalyst support with specific surface area SBET (up to 1000-1100 m2 /g), total pore volume (up to 1.15 cm3/g) and 4.09 nm interlayer spacing is formed. Then, a Ni catalyst is prepared by wetness impregnation of PCH-HSA with aqueous solutions of nickel nitrate with good dispersion of Ni nanoparticles (18 nm) on the PCH-HSA support. The Ni/PCH-HSA catalyst is characterized by high CO2 conversion of 94%, synthetic bio-CH4 yield of 88.6% and selectivity of 94%, respectively. |
| Type |
Patent |
| Language |
English |
| Publication date |
2022 |
