Bismuth Molybdate Catalyst Butadiene Yield Optimization
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Solution Overview
Problem
Current multi-component bismuth molybdate catalysts for butadiene production from butene mixtures 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 synthesis.
Innovation Solution
A multi-component bismuth molybdate catalyst comprising bismuth, molybdenum, and at least one monovalent or trivalent cation, with the addition of cesium and potassium, prepared through specific precursor solutions and calcination processes, is used to enhance conversion ratio, yield, and selectivity of butadiene production from butene mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-component bismuth molybdate catalysts with various metals are used to improve butadiene yield, then catalytic activity is improved, but catalyst components become complicated and synthesis route becomes complex
Solution Approach 1:
The patent applies universality by using a standardized set of metal components (Fe, Co, Cs, K) that can be systematically combined in different ratios to address multiple catalytic requirements. This multi-functional approach allows a single catalyst system to optimize various reaction aspects without continuously adding new metal types, thereby improving butadiene yield while controlling complexity through a universal component framework.
Solution Approach 2:
The patent employs parameter changes by systematically varying the molar ratios of established metal components (Fe:Co:Cs:K) rather than adding new metal types. This approach allows optimization of catalytic activity and butadiene yield through controlled adjustment of existing component proportions, avoiding the complexity increase that would result from continuously introducing new metal elements into the catalyst system.
2Quantity of substance
If C4 mixture with high normal-butane content is used as reactant, then feedstock availability is improved, but butadiene yield decreases and separation requirements increase
Solution Approach 1:
The patent applies parameter changes by modifying the catalyst's metal composition ratios (specifically Fe, Co, Cs, and K proportions) to adapt to varying feedstock compositions. This allows the catalyst to maintain high butadiene yield even when processing C4 mixtures with high normal-butane content, eliminating the need to reduce normal-butane content for feedstock preparation and thereby improving both feedstock availability and productivity simultaneously.
3Productivity
If oxidative dehydrogenation is performed at high temperature to improve reaction rate, then productivity is improved, but energy consumption increases and carbon deposition occurs
Solution Approach 1:
The patent employs parameter changes by modifying the catalyst's metal oxide composition and ratios to enhance catalytic activity at lower temperatures. This allows the oxidative dehydrogenation reaction to proceed at reduced temperatures while maintaining high reaction rates, thereby improving productivity without increasing energy consumption or causing carbon deposition issues associated with high-temperature operation.
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 improved butadiene yield and selectivity, along with process stability, even at low hot spot temperatures, by optimizing the molar ratios of cesium and potassium, thereby improving economic efficiency and simplifying catalyst synthesis.
Implementation Method 1
a bismuth molybdenum-based catalyst which is a composite of bismuth oxide and molybdenum oxide is known to exhibit superior activity
Implementation Method 2
a method of preparing the same
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.