Cobalt Mesoporous Oxide Catalyst Aerosol Spray Drying Synthesis
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Solution Overview
Problem
Conventional Fischer-Tropsch synthesis catalyst production methods are complex, energy-intensive, and environmentally costly, with limitations in catalyst reactivity and compatibility, particularly when using pre-formed nanoparticles of cobalt and silica, which restricts the development of efficient hydrocarbon synthesis processes.
Innovation Solution
A process involving the direct incorporation of cobalt molecular precursors into a mesoporous oxide matrix through aerosol spray drying, followed by reduction treatment, to create a catalyst with improved cobalt dispersion and reactivity, simplifying the production and enhancing catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods for preparing supported metallic catalysts are used (depositing precursor on pre-formed oxide support), then the catalyst can be produced with established procedures, but the process becomes complex with many steps including synthesis of oxide support, impregnation, drying, calcining, and activation
Solution Approach 1:
The patent combines the synthesis of the oxide support and the deposition of the metallic precursor into a single simultaneous process. Both the oxide support and cobalt precursor are formed together in the same reaction medium, eliminating the need for separate support synthesis and impregnation steps. This merging of operations directly reduces the number of process steps while maintaining catalyst quality.
Solution Approach 2:
The patent incorporates the metallic precursor into the support matrix during the support formation process itself, rather than adding it afterward. By performing the precursor incorporation as a preliminary action during support synthesis, the method eliminates subsequent impregnation and drying steps, simplifying the overall manufacturing process.
2Productivity
If multiple separate steps are used for catalyst preparation (synthesis of support, impregnation, drying, calcining, activation), then each step can be optimized independently, but the total energy consumption increases and production time is extended
Solution Approach 1:
The patent merges multiple energy-intensive steps (drying, calcining, and precursor decomposition) into a single heating step. By combining these operations, the total energy consumption is reduced compared to performing each step separately with intermediate cooling and reheating cycles. The simultaneous formation of support and precursor in one reaction vessel eliminates redundant heating/cooling cycles.
Solution Approach 2:
The patent maintains continuous useful action throughout the process by avoiding idle periods between steps. The precursor is present during the entire support synthesis and drying process, and activation occurs continuously during the final heating step. This continuous utilization of reactants and energy, without interruption or intermediate storage, improves overall productivity and reduces energy waste.
3Reliability
If pre-formed nanoparticles of cobalt and silica are used, then the catalyst components are readily available, but the reactivity and compatibility of the catalyst are limited
Solution Approach 1:
The patent creates local quality variations within the catalyst structure by incorporating the cobalt precursor directly into the oxide matrix during synthesis. This results in non-uniform distribution of cobalt species at the molecular level, with different local environments (surface-exposed vs. embedded) that enhance both reactivity and compatibility. The local structural variations allow the catalyst to adapt to different reaction conditions.
Solution Approach 2:
The patent creates a composite material where the cobalt precursor and oxide support are intimately mixed at the molecular level during synthesis, rather than being separate pre-formed nanoparticles. This composite structure with intimate contact between components enhances reactivity and compatibility, as the cobalt species are integrated into the support matrix rather than merely physically mixed with it.
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
This approach results in a more efficient and environmentally friendly synthesis of linear paraffinic hydrocarbons, reducing production costs and environmental impact while maintaining or exceeding the performance of conventional catalysts, with improved catalytic performances and yield in hydrocarbon synthesis.
Implementation Method 1
aerosol spray drying the mixture obtained in step a) in order to result in the formation of spherical liquid droplets
Implementation Method 2
activation of said solid particles by means of a reduction treatment in a manner such as to form nanoparticles of cobalt with an oxidation state of 0
Implementation Method 3
Process for the synthesis of hydrocarbons from synthesis gas in the presence of a catalyst based on cobalt trapped in a mesoporous oxide matrix
Data Source
AI summary
A process for the synthesis of linear paraffinic hydrocarbons from a feed of carbon monoxide and dihydrogen in the presence of a catalyst of a mesoporous oxide matrix and a content by weight of the element cobalt of 0.5% to 60%, wherein the catalyst is prepared bya) mixing, in an aqueous or hydro-organic solvent, a molecular precursor containing cobalt and a molecular precursor of the mesoporous oxide matrix containing element X of silicon, aluminium, titanium, zirconium and or cerium;b) aerosol spray drying the mixture to form spherical liquid droplets;c) drying to obtain solid particles at a temperature of 10° C. to 300° C.;d) activation by a reduction treatment to form nanoparticles of cobalt with an oxidation state of 0.