Multi-Component Bismuth Molybdate Catalyst for Butadiene Production
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Solution Overview
Problem
Current methods for producing butadiene from butene mixtures using bismuth molybdate catalysts face limitations in yield, selectivity, and process stability, especially when using C4 mixtures with high normal-butane content, leading to economic inefficiencies and complex catalyst compositions.
Innovation Solution
A multi-component bismuth molybdate catalyst comprising bismuth, molybdenum, iron, cobalt, cesium, and potassium, with a specific molar ratio, is prepared through a method involving precursor solutions, mixing, reaction, drying, and calcination, and used in a fixed bed reactor for oxidative dehydrogenation of butene-containing C4 mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-component bismuth molybdate catalysts containing various metals are used to improve catalytic activity, then butadiene yield and selectivity are improved, but catalyst composition becomes complicated and synthesis route becomes complex
Solution Approach 1:
The patent optimizes the catalyst composition by specifying precise molar ratios of metal components (Bi: 0.5-2.0, Mo: 1.0-3.0, Fe: 0.1-0.5, Co: 0.1-0.5, Cs: 0.01-0.1, K: 0.01-0.1 relative to butene), transforming the catalyst from a complex mixture to a precisely parameterized composition that achieves high butadiene yield (85-95%) with controlled synthesis complexity
Solution Approach 2:
The patent creates a composite catalyst material combining multiple metal oxides (bismuth oxide, molybdenum oxide, iron oxide, cobalt oxide, cesium oxide, potassium oxide) in specific proportions, where each component contributes specific functionality: Bi and Mo provide catalytic activity, Fe and Co enhance selectivity, while Cs and K improve stability, achieving high productivity through material composition optimization
2Adaptability or versatility
If C4 mixture with high normal-butane content is used as reactant, then availability and economic efficiency are improved, but butadiene yield decreases due to low normal-butene content
Solution Approach 1:
The patent modifies the reaction parameters by optimizing temperature (200-400°C), pressure (0.1-10 MPa), and oxygen concentration (1-20% in feed gas) to enhance the catalytic conversion efficiency, enabling high butadiene yield (85-95%) even when processing C4 mixtures with varying normal-butene contents including those with high normal-butane content
Solution Approach 2:
The patent creates different functional zones within the catalyst structure where specific metal oxides are distributed to perform localized functions: Bi-Mo regions handle dehydrogenation, Fe-Co regions enhance selectivity, and Cs-K regions promote stability, allowing the catalyst to effectively process diverse C4 mixture compositions
3Productivity
If oxidative dehydrogenation is performed at high temperature to increase reaction rate, then productivity is improved, but energy consumption increases and hot spot formation occurs
Solution Approach 1:
The patent optimizes the reaction temperature parameter to the range of 200-400°C, which is lower than conventional processes, achieving high reaction rates through enhanced catalytic activity from the multi-component oxide system while reducing energy input requirements and preventing hot spot formation
Solution Approach 2:
The composite catalyst material combines metal oxides with different thermal and catalytic properties: Bi2O3 and MoO3 provide high catalytic activity at lower temperatures, while Fe2O3, Co3O4, Cs2O, and K2O contribute to thermal stability and heat distribution, enabling high productivity with reduced energy consumption
4Productivity
If pure normal-butene is used as reactant to achieve high butadiene yield, then butadiene yield is improved, but separation cost increases and economic efficiency deteriorates
Solution Approach 1:
The patent optimizes reaction parameters including temperature (200-400°C), pressure (0.1-10 MPa), and oxygen feed composition (1-20%) to maximize butadiene selectivity and yield (85-95%) when processing C4 mixtures, eliminating the need for expensive normal-butene separation while maintaining high productivity
Solution Approach 2:
The catalyst system performs multiple functions simultaneously: it catalyzes dehydrogenation of both 1-butene and 2-butene, tolerates varying C4 mixture compositions, and maintains stability over extended operation, making the process universally applicable to different feedstocks without requiring pre-separation
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 achieves high butadiene conversion ratios (95% or more) and selectivity (90% or more), while maintaining process stability and reducing hot spot temperatures, thereby improving economic efficiency and simplifying catalyst synthesis.
Implementation Method 1
a multi-component bismuth molybdate catalyst for production of butadiene from a butene mixture
Implementation Method 2
oxidative dehydrogenation (ODH) of normal-butene to produce butadiene has advantages of reducing energy consumption because it is an exothermic reaction
Data Source
AI summary
Disclosed is a multi-component bismuth molybdate catalyst for production of butadiene which comprises bismuth, molybdenum and at least one metal having a monovalent, divalent or trivalent cation, and further comprises cesium and potassium and thus has advantages of improving conversion ratio, yield and selectivity of butadiene and of providing stability of process operation.