Journal Article

Silicalite-Supported Ni Catalysts for Efficient CO 2 Conversion into CH 4

De, Avik, Shezad, Nasir, Samikannu, Ajaikumar, Akhtar, Farid, Mikkola, Jyri-Pekka

2026

Overview

The catalytic conversion of CO into methane (CH ) offers a sustainable solution to the worsening global warming scenario, especially for controlling CO levels. This study reports silicalite-1 supported Ni catalysts with different loadings for CO conversion to CH , prepared via wet impregnation. The X-ray diffraction pattern revealed an increase in crystallite size at higher Ni loadings, which was further supported by N sorption, where the specific surface area and microporosity of the catalysts were decreased. There was a slight shift in the reducibility of the catalysts, potentially indicating the impact of loading on dispersion and spatial distribution. The catalyst performance was evaluated over a range of temperatures at 5 bar and a GHSV of 20,000 mL g h . Surprisingly, the Ni(5)@Silicalite-1 exhibited higher CO conversion efficiency across the range of temperatures compared to Ni(10)@Silicalite-1. The NiO(5)@Silicalite-1 demonstrated a maximum CO conversion of 88% at 450 °C, which was approximately 14% higher than that of the catalyst with a 10 wt.% loading. Notably, the CH selectivity pattern was quite identical across the catalysts, underscoring that the reaction pathways were unaffected by the loadings. The higher performance of NiO(5)@Silicalite-1 could be ascribed to smaller NiO crystallites and improved textural properties.