Heterogeneous Nickel Catalyst on Alumina for Polyetheramine Synthesis

The patent applies composite materials by combining nickel with aluminum oxide support to create a heterogeneous catalyst system. The nickel particles are dispersed on the aluminum oxide surface, creating a composite structure that maintains high catalytic activity while improving stability. This is achieved through the synergistic interaction between the metal catalyst and oxide support, preventing nickel aggregation and degradation during prolonged reaction periods.

The patent utilizes porous materials by employing aluminum oxide with controlled porosity as the support. The porous structure provides high surface area for nickel dispersion, enhances mass transfer of reactants and products, and improves mechanical strength. The porous aluminum oxide matrix stabilizes nickel particles and prevents their leaching, thereby maintaining long-term catalytic stability while preserving activity.

The patent applies parameter changes by optimizing the preparation conditions including calcination temperature, reduction temperature, and metal loading concentration. By carefully controlling these parameters, the catalyst achieves optimal balance between activity and selectivity. The calcination temperature affects nickel particle size and distribution, while reduction conditions influence metal crystallinity, all of which tune the catalytic performance to maintain high activity with improved selectivity.

The patent implements local quality by creating non-uniform nickel distribution on the aluminum oxide support surface. The nickel particles are dispersed heterogeneously with varying sizes and concentrations in different regions, creating sites with different catalytic properties. This local variation allows simultaneous presence of high-activity sites and high-selectivity sites, resolving the contradiction between activity and selectivity.