Biogas Dry Reforming Over Ni–Mg–La–Al Catalysts: Influence of La/Mg Ratio

Performance Analysis of Hydrogen Production for a Solid Oxide Fuel Cell System Using a Biogas Dry Reforming Membrane Reactor with Ni and Ni/Cr Catalysts

“…An SOFC system can also use CO produced via biogas dry reforming as a fuel, providing an effective energy production system. Some researchers have investigated biogas dry reforming [5][6][7][8][9][10][11][12][13][14][15]. The catalyst for biogas dry reforming is one of the important factors for promoting the performance of biogas dry reforming.…”

“…A catalyst with low Ni loading (2.5 wt%) modified with Gd, Sc or La was developed, and it exhibited CH 4 conversion of 49% and CO 2 conversion of 96% at 750 • C as its best performance [7]. The H 2 /CO ratio was over 0.9 at 750 • C. The impact of the La/Mg ratio on the performance of a biogas-dry-reforming Ni/Mg/La/Al catalyst was evaluated [8]. The Mg 1 La 4 (Ni: 55 mol%; Al: 33 mol%; Mg: 2.2 mol%; La: 8.8 mol%) exhibited the best performance, which was CH 4 conversion of 80% and CO 2 conversion of 94% as well as a H 2 /CO ratio of 2 at 700 • C. Bimetallic Ni/Ru and Ni/Re catalysts also exhibited CH 4 conversion of 82% and CO 2 conversion of 75% with a 0.5 Ni/Ru (Ni: 15.2 wt%; Ru: 0.4 wt%; the other materials: modified support) catalyst at 700 • C as their best performance [9].…”

“…In addition, most of the previous studies were conducted at over 700 • C. Since biogas dry reforming entails an endothermic reaction, a lower reaction temperature is better to promote the thermal efficiency of the reactor. Although several Ni-based catalysts have been attempted as described above, including Ni-SiO 2 @SiO 2 [6], Ni loading modified with Gd, Sc or La [7], Ni/Mg/La/Al [8], bimetallic Ni/Ru and Ni/Re [9], Yttria-modified Zr supported on 5 wt% of a Ni-based catalyst, changing the Ce from 1 wt% to 3 wt% [10], Ni-Ce/TiO 2 -ZrO 2 [11], Ni/Al layered double hydroxides (LDH) reconstructed with Mg and Zn [12], Ni/γ-Al 2 O 3 cordierite monolith, and Ni/Co supported on a TiO 2 catalyst, a Ni/Cr has not been investigated. According to a previous study reporting the performance of Ni/MgO with Sn, Ce, Mn and Co [16], the higher catalytic activity for Co-promoted catalysts can be attributed to its high affinity for O 2 species due to promoting the coke resistance properties.…”

Overview of Ni-Based Catalysts for Hydrogen Production from Biogas Reforming

“…Calgaro et al [64] evaluated the La/Mg ratio in Ni-Mg-La-Al catalysts derived from hydrotalcites for the biogas DR (CH 4 /CO 2 ratio of 2.33). The increase in the La/Mg ratio decreased the average crystallite size of Ni and increased the strength of acid sites, improving the catalytic activity at 700 • C. The catalyst with La/Mg = 4 presented the best activity and stability due to its greater resistance to sintering and a proper combination of acidic and basic sites.…”

“…The catalysts supported on promoted supports exhibited higher methane conversion in DRM at all temperatures (550-750 • C). The catalyst promoted with CeO 2 exhibited the highest activity and the lowest coke formation, which was related to the redox properties of the ceria.Calgaro et al[64] evaluated the La/Mg ratio in Ni-Mg-La-Al catalysts derived from hydrotalcites for the biogas DR (CH 4 /CO 2 ratio of 2.33). The increase in the La/Mg ratio decreased the average crystallite size of Ni and increased the strength of acid sites, improving the catalytic activity at 700 • C. The catalyst with La/Mg = 4 presented the best…”