Sulfurized ZSM-5 Catalyst for Light Hydrocarbon Synthesis
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Solution Overview
Problem
Previous processes for forming light hydrocarbons using zeolites often result in broad product distributions with undesirable long chain hydrocarbons and solid waxes, which are not suitable for all applications.
Innovation Solution
A sulfurized ZSM-5 catalyst is used, comprising cobalt, an alkali metal, sulfur, and a reduction promoter, which is activated by contacting with a synthesis gas feed stream under specific conditions to produce hydrocarbons with five to twelve carbon atoms, minimizing the presence of longer chain hydrocarbons and solid waxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional zeolite catalysts with cobalt or ruthenium are used to produce light hydrocarbons, then hydrocarbon production is achieved, but the product distribution becomes broad with undesirable long chain hydrocarbons and solid waxes
Solution Approach 1:
The patent applies parameter changes by modifying the catalyst composition parameters - specifically incorporating sulfurized ZSM-5 with cobalt and alkali metal in controlled amounts. This changes the catalytic properties to achieve narrow product distribution centered on C5-C12 hydrocarbons while suppressing long chain hydrocarbons and waxes, thus resolving the contradiction between production quantity and product precision
Solution Approach 2:
The invention uses a composite catalyst material combining sulfurized ZSM-5 zeolite support with cobalt and alkali metal promoters. This composite structure creates synergistic effects that provide both high hydrocarbon production activity and selective control over product distribution, eliminating the need for separate functions that would otherwise be required
2Reliability
If mesopores are introduced in zeolites to modify catalyst properties, then certain catalytic performance is improved, but mesopores become undesirable for some applications
Solution Approach 1:
The patent applies local quality by maintaining the natural microporous structure of ZSM-5 without introducing mesopores, while locally modifying the catalyst properties through sulfurization and addition of cobalt and alkali metal. This preserves the shape selectivity and application versatility of the original zeolite structure while achieving the desired catalytic performance through localized chemical modifications
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 process effectively produces a liquid product stream with at least 25 wt% C5-C12 hydrocarbons and less than 5 wt% C13-C20 hydrocarbons, reducing the presence of solid waxes and achieving a more targeted hydrocarbon distribution.
Implementation Method 1
contacting a synthesis gas feed stream with a sulfurized ZSM-5 catalyst to form C5-C12 hydrocarbons
Data Source
AI summary
Form liquid product stream that has a C13 to C20 hydrocarbon content of less than 5.0 wt% based upon a total weight of the liquid product stream via a process that includes contacting synthesis gas with a sulfurized Zeolite Socony Mobil-5 catalyst. The sulfurized Zeolite Socony Mobil-5 catalyst can include ZSM-5, cobalt, an alkali metal, sulfur, and a reduction promoter.