Efficient and Stable Ni/SBA-15 Catalyst for Dry Reforming of Methane: Effect of Citric Acid Concentration

Citric acid, one of the representative chelate compounds, has been widely used as an additive to achieve highly dispersed metal-supported catalysts. This study aimed investigate effect citric acid concentration on preparation Ni catalysts mesoporous silica (SBA-15) for dry reforming methane. A series Ni/SBA-15 with were prepared using acid-assisted incipient wetness impregnation method, and catalyst a reference was synthesized via method. First all, addition during synthesis step regardless its resulted in particles ~4–7 nm size catalysts, which had superior stable catalytic performance methane (93% CO2 conversion 86% CH4 conversion). In addition, amount coke formation much lower (~2–5 mgcoke gcat−1 h−1) compared pristine (~22 h−1). However, when became higher, more free NiO species that formed SBA-15 support, leading large after stability test. The is very clear strategy making but needs be carefully controlled.