Trimetallic Catalyst for Bio-Oil Upgrading

The patent employs a composite catalyst system comprising multiple metal components (nickel, cobalt, and molybdenum) supported on alumina with phosphorus promotion. This composite structure synergistically combines the functions of different metals: nickel and cobalt for hydrogenation activity, molybdenum for acidity control, and phosphorus for structural stabilization. The composite material approach resolves the contradiction by achieving both high yield (81-90%) and low acidity (TAN ≤ 0.17 mg KOH/g) simultaneously, which cannot be achieved with conventional single-metal or bimetallic catalysts.

The patent merges multiple catalytic functions (hydrogenation, hydrodeoxygenation, hydrodesulfurization, and acidity control) into a single integrated catalyst system. The composite catalyst with nickel, cobalt, molybdenum, and phosphorus on alumina support performs all necessary upgrading reactions in one step, eliminating the need for multiple sequential treatment stages with different reagents and fluid media. This consolidation simplifies the操作流程 while maintaining comprehensive upgrading effectiveness.

The patent optimizes critical parameters including the metal composition ratios (Ni:Co:Mo = 1:1:3), phosphorus content (0.5-2 wt%), and calcination temperature (500-700°C) to achieve maximum catalytic efficiency at moderate operating conditions. The optimized catalyst enables effective upgrading at lower temperatures and pressures compared to conventional systems, reducing energy consumption. Additionally, the high activity of the composite catalyst allows for shorter reaction times and reduced catalyst loading, further lowering both energy and operational costs.