The effect of the sandblasting method on the performance of LaNiO₃/γ-Al₂O₃ adhesion in a microchannel reactor for dry reforming of methane process

Dry methane reforming for hydrogen gas production has become one of the most popular methods in recent years. For this purpose, the performance of thin-film LaNiO₃ and LaNiO₃/γ-Al₂O₃ perovskite catalysts in a microchannel reactor has been investigated. Alumina support was used to improve the H₂/CO ratio in the LaNiO₃ catalyst. It should be noted that the molar ratio of CH₄: CO₂: He in the feed was 1:1:8. Additionally, the temperature, pressure, and residence time are 800 °C, 1 atm, and 3 s, respectively. Also, the weight of the catalyst coated on the plate for GC tests and the reaction rate are \(8.2 \times {10}^{-3}\) $8.2\times {10}^{-3}$ g and 0.006 mol CH₄/min.gr cat, respectively. Extensive characterization of these nanocatalyst powders (C.P.) using XRD, FT-IR, SEM, and EDX confirmed the correct synthesis of the C.P. without any impurities in the thin layer catalyst. The H₂/CO ratio for LaNiO₃/γ-Al₂O₃ was 0.98 and the catalyst was uniformly stable for 30 h on the stream. Since the H₂/CO ratio, for LaNiO₃ was 0.91 at 15h on the stream, it was found that the alumina support can significantly increase the stability and decrease the deactivation rate compared to the LaNiO₃ catalyst. In other words, catalyst coating (C.C.) on stainless steel is costly and requires certain coating conditions. Using the new novel sandblasting method for roughness and coating synthesized catalyst on stainless steel causes considerable adhesion of the catalyst on the surface compared to the other coating method, providing better control over the catalyst load.