Bimetallic Catalyst for Vegetable Oil Hydroconversion
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Solution Overview
Problem
Current methods for converting vegetable oils to diesel fuels face inefficiencies at high temperatures and high hydrogen pressures, with catalysts losing activity over time and producing products that do not meet specifications for use as transportation fuels.
Innovation Solution
A catalyst composition comprising Group III, V, and VIII elements supported on an inorganic porous material, specifically aluminum oxide, with controlled pore size distribution and surface area, is developed for efficient hydroconversion of vegetable oils to diesel-range hydrocarbons, using a process involving sulfidation and calcination steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts are used for vegetable oil hydroconversion at high temperatures and pressures, then conversion activity is initially achieved, but catalyst activity is lost over time and product specifications are not met
Solution Approach 1:
The patent uses a composite catalyst system comprising Group VI metal (molybdenum or tungsten) and Group VIII metal (nickel, cobalt, or ruthenium) supported on inorganic porous materials. This composite structure combines the hydrodeoxygenation activity of Group VI metals with the hydrogenation and isomerization capabilities of Group VIII metals, providing stable catalyst activity and extended lifespan under high temperature and pressure conditions
Solution Approach 2:
The catalyst employs inorganic porous supports with controlled pore size distribution (0.003-0.06 μm) and surface area (150-350 m²/g) to maintain high catalyst activity stability. The porous structure provides high surface area for active metal dispersion and facilitates mass transfer of reactants and products, preventing catalyst deactivation and extending operational duration
2Ease of manufacture
If existing petroleum refinery infrastructure is used for vegetable oil processing, then capital investment is reduced, but catalyst performance and product specification compliance become challenging
Solution Approach 1:
The patent optimizes process parameters including temperature (300-450°C), pressure (30-150 bar), and LHSV (0.5-5 h⁻¹) to achieve compliance with diesel fuel specifications when using existing refinery infrastructure. The catalyst composition is specifically designed to function effectively within these parameter ranges, enabling production of hydrocarbons meeting ASTM D975 standards for cetane number, sulfur content, and aromatic content
3Productivity
If trans-esterification route is used for biodiesel production, then new production capacity is created, but capital investment increases and glycerol disposal becomes a problem
Solution Approach 1:
The hydroconversion catalyst system performs multiple functions simultaneously: hydrodeoxygenation of triglycerides, saturation of unsaturated bonds, removal of heteroatoms (sulfur, nitrogen), and production of diesel-range hydrocarbons. This multi-functionality eliminates the need for separate trans-esterification and glycerol processing units, reducing device complexity while maintaining high productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The catalyst composition achieves nearly complete conversion of vegetable oils to diesel at high temperatures and pressures, maintaining activity over longer durations and producing high cetane number diesel with improved fuel properties, suitable for blending with conventional diesel.
Implementation Method 1
catalyst composition for conversion of vegetable oils to hydrocarbon products in the diesel boiling range
Implementation Method 2
Group III, V elements; mono or bimetallic groups VI and VIII elements supported on inorganic porous support
Data Source
AI summary
The present invention relates to a catalyst composition for conversion of vegetable oils to hydrocarbon products in the diesel boiling range, comprising a porous support; Group III A or VA element in the range of 1-10 wt %; Group VI B elements in the range of 1 to 20 wt %; Group VIII B elements in range of 0.01 to 10 wt %. The present invention further provides the process for preparing the catalyst composition for conversion of vegetable oils to hydrocarbon products in the diesel boiling range. The present invention also provides the process for conversion of vegetable oils to hydrocarbon products in the diesel boiling range using the catalyst composition or discarded refinery spent hydro-treating catalyst.