Supported Chromium II Catalyst for Alkane Conversion
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Solution Overview
Problem
Current methods for upgrading the octane value of low molecular weight hydrocarbons and converting crude oil components into higher value gasoline components either require strong acids or high operating temperatures, which are undesirable.
Innovation Solution
The use of a supported chromium (II) catalyst to crack alkane reactants into both lower and higher molecular weight aliphatic hydrocarbon products at temperatures below 300°C, producing a mixture of hydrocarbons including linear, branched, and aromatic compounds, without the need for strong acids or high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strong acids are used to upgrade low molecular weight hydrocarbons, then the octane value is improved, but the process complexity and safety risks increase
Solution Approach 1:
The patent changes the fundamental parameter from using strong acids (chemical reagent) to using a solid catalyst (chromium-based catalyst on support). This parameter change eliminates the need for acid handling equipment, neutralization systems, and waste acid treatment facilities, thereby reducing device complexity while maintaining the ability to upgrade octane value through catalytic alkylation and isomerization reactions
Solution Approach 2:
The patent employs a solid catalyst that can be easily separated and regenerated, replacing the need for continuous acid consumption and disposal systems. The catalyst acts as a reusable component that simplifies the overall process design by eliminating complex acid management infrastructure
2Productivity
If high operating temperatures are used to crack crude oil components, then the conversion efficiency is improved, but the energy consumption increases
Solution Approach 1:
The patent introduces a chromium-based catalyst as an intermediary substance that facilitates the cracking and conversion reactions at lower temperatures. The catalyst provides an alternative reaction pathway with lower activation energy, enabling high conversion efficiency without the need for high operating temperatures, thereby reducing energy consumption while maintaining productivity
Solution Approach 2:
The patent changes the operating temperature parameter from high temperature (conventional cracking) to moderate temperature (catalytic conversion). This parameter change is enabled by the presence of the catalyst, which maintains reaction effectiveness at lower temperatures, thus reducing the energy input required while preserving conversion efficiency
3Reliability
If conventional catalysts are used in FCCU, then the cracking activity is maintained, but the catalyst activity deteriorates due to transition metals
Solution Approach 1:
The patent converts the harmful effect of transition metals (which normally deactivate conventional catalysts) into a beneficial feature by designing a chromium-based catalyst where the transition metal (chromium) is the active component. The chromium species on the support surface provides the desired catalytic activity for alkane conversion, transforming what is typically a detrimental factor into the source of catalytic functionality
Solution Approach 2:
The patent employs a composite catalyst structure consisting of chromium species dispersed on a support material. This composite design provides both the catalytic activity of chromium and the stability of the support, creating a robust catalyst that maintains activity without suffering from the deactivation issues that plague conventional single-material catalysts
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 process efficiently converts alkanes into a variety of hydrocarbon products at moderate temperatures, achieving high yields of lower and higher molecular weight hydrocarbons, including hydrogen, while avoiding the use of strong acids and high temperatures.
Implementation Method 1
contacting the alkane reactant with a supported chromium (II) catalyst to form the lower aliphatic hydrocarbon product
Data Source
AI summary
Processes for cracking an alkane reactant to form a lower aliphatic hydrocarbon product and for converting an alkane reactant into a higher aliphatic hydrocarbon product are disclosed, and these processes include a step of contacting the alkane reactant with a supported chromium (II) catalyst. In addition to the formation of various aliphatic hydrocarbons, such as linear alkanes, branched alkanes, 1-alkenes, and internal alkenes, aromatic hydrocarbons and hydrogen also can be produced.