Core-shell Zinc Ferrite Catalyst for Butadiene Production
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Solution Overview
Problem
The economic feasibility of the oxidative dehydrogenation process for butene to butadiene is hindered by high steam costs and heat energy loss when large amounts of steam are used, leading to inefficient production and increased waste water disposal costs.
Innovation Solution
A catalyst system comprising a core and shell part, both made of zinc ferrite-based materials with different compositions, supported on a porous substrate, which suppresses side reactions and maintains low hot spot movement speed without altering the ferrite structure, allowing for high butadiene yield using reduced steam amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large amounts of steam are used in the oxidative dehydrogenation reaction, then butene conversion and butadiene selectivity are improved, but steam costs and heat energy loss increase significantly
Solution Approach 1:
The invention changes the chemical composition parameters of the catalyst by incorporating specific metal elements (such as Fe, Cr, Mn, Co, Ni, Cu, Zn, Mo, W, V, Nb, Ta, Pd, Pt, Rh, Ir) into the zinc ferrite structure in controlled amounts (0.1-10 wt%). This compositional modification alters the catalyst's electronic and geometric properties, enabling high butene conversion and butadiene selectivity without requiring large steam amounts, thus reducing heat energy loss while maintaining productivity
Solution Approach 2:
The invention creates a composite catalyst material by combining zinc ferrite with other metal oxides or metals. This composite structure synergistically combines the properties of different materials: zinc ferrite provides the base catalytic activity and spinel structure stability, while the added metal elements enhance specific reaction pathways for butene conversion and butadiene formation, reducing the need for steam as a reaction promoter and thereby minimizing energy loss
2Reliability
If large amounts of steam are used in the oxidative dehydrogenation reaction, then explosion range is reduced and reaction vessel stability is improved, but waste water disposal costs increase
Solution Approach 1:
The invention modifies the catalyst's chemical composition by adding specific metal elements to zinc ferrite, changing its catalytic properties to achieve high selectivity for butadiene formation. This parameter change reduces the need for large steam amounts used for safety and stability control, thereby minimizing the production of waste water containing oxygenates and reducing disposal costs while maintaining reaction vessel stability
Solution Approach 2:
The invention converts the potential harm of side reactions and safety concerns into benefits by using a modified catalyst composition that achieves superior selectivity and activity. The enhanced catalyst performance inherently suppresses unwanted reactions, reducing the need for excessive steam as a safety measure and converting what would be waste water disposal problems into a more efficient, cleaner process
3Productivity
If zinc ferrite catalyst is used for oxidative dehydrogenation, then butadiene selectivity is improved, but catalyst activity and service life need enhancement
Solution Approach 1:
The invention creates a composite catalyst system where zinc ferrite is combined with other metal elements (Fe, Cr, Mn, Co, Ni, Cu, Zn, Mo, W, V, Nb, Ta, Pd, Pt, Rh, Ir) to form a multi-component catalytic material. This composite structure synergistically enhances both the short-term activity (through improved butadiene selectivity from zinc ferrite) and long-term service life (through the stabilizing and promotional effects of the added metal elements that resist deactivation and maintain structural integrity over time)
Solution Approach 2:
The invention optimizes the catalyst's chemical composition parameters by precisely controlling the amount of added metal elements (0.1-10 wt%) within the zinc ferrite structure. This parameter optimization simultaneously improves catalytic activity for butadiene formation and enhances structural stability for extended service life, resolving the contradiction between achieving high selectivity and maintaining long-term durability
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 catalyst system achieves high butadiene yield and low hot spot movement speed, enhancing the economic viability of the process while minimizing steam usage and associated costs.
Implementation Method 1
A catalyst for an oxidative dehydrogenation reaction, and a method for producing same
Data Source
Figure 1~2
AI summary
The catalyst for an oxidative dehydrogenation reaction according to an exemplary embodiment of the present application comprises: a core part comprising a porous support, and a first zinc ferrite-based catalyst supported on the porous support; and a shell part comprising a second zinc ferrite-based catalyst supported on the core part, in which the first zinc ferrite-based catalyst and the second ferrite-based catalyst are different from each other.