Preparation of highly dispersed Ni/ Al2O3 catalysts by heat treatment of supported basic nickel nitrate with hydrogen-containing gas

The process of preparing a highly concentrated Ni/Al₂O₃ catalyst by impregnating γ-Al₂O₃ with a nickel nitrate solution followed by calcination in a hydrogen-containing atmosphere was studied. Calcination of the supported Ni₃(OH)₄(NO₃)₂, which is formed during the heat treatment of the impregnated carrier at 200 °C, in an H₂ environment (H₂ content ≥20%) at 230 °C promotes the formation of a phase of highly dispersed NiO. In this case, nitrate ions are completely removed and there is no enlargement of the active component particles compared to the initial Ni₃(ОН)₄(NO₃)₂ phase. A decrease in the H₂ concentration in the gas mixture reduces the rate of nitrate decomposition and leads to an agglomeration of the active component particles at an H₂ content of ≤5%. An assumption is made about the role of hydrogen in the process of calcining the catalyst precursor.

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