Mixed Metal Oxide Catalyst for Propane Dehydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The industry faces a need for cost-effective, environmentally friendly dehydrogenation catalysts that are commercially viable, particularly for the production of propylene, as existing catalysts like Platinum-based and Chromium-based systems are expensive and pose environmental concerns.
Innovation Solution
A mixed metal oxide catalyst composition comprising Transition Metals (Cu, Fe, Mn, Nb, Zn) supported on oxides of Al, Si, Ti, and Zr, with Rare Earth metals as stabilizers, characterized by specific activity, selectivity, and stability parameters, is developed for the dehydrogenation of paraffins, avoiding the use of Platinum and Chromium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Platinum-based catalyst is used for dehydrogenation, then catalytic activity is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive Platinum-based catalysts with cheaper alternative catalyst systems comprising metal oxides (such as Ga2O3, ZnO, Nb2O5) supported on alumina or other oxide supports. These alternative catalysts achieve acceptable dehydrogenation activity at a fraction of the cost of Platinum, making the process economically viable despite potentially shorter catalyst lifetime requiring regeneration.
Solution Approach 2:
The patent employs composite catalyst formulations combining multiple metal oxides (e.g., Ga2O3-Nb2O5, ZnO-Ga2O3) on oxide supports. These composite materials synergistically provide the necessary catalytic activity for dehydrogenation while maintaining cost-effectiveness and resistance to deactivation, replacing the need for noble metal Platinum.
2Quantity of substance
If Chromium-based catalyst is used for dehydrogenation, then cost is reduced compared to Platinum, but environmental harm increases due to carcinogenicity
Solution Approach 1:
The patent extracts and eliminates Chromium from the catalyst formulation, replacing it with environmentally benign metal oxides such as Ga2O3, ZnO, and Nb2O5. These alternative materials maintain the necessary catalytic function for dehydrogenation without the carcinogenic properties of Chromium, thereby resolving the environmental harm issue while keeping costs low.
Solution Approach 2:
The patent adopts cheaper, non-toxic metal oxide catalysts that can be regenerated and reused multiple times. These catalysts provide cost-effective dehydrogenation activity without the environmental hazards of Chromium, achieving both economic and environmental goals through disposable/regenerable catalyst design.
3Productivity
If steam cracker is used for propylene production, then production capacity is maintained, but propylene/ethylene ratio is low
Solution Approach 1:
The patent applies dehydrogenation catalysts with specific selectivity properties to convert propane directly to propylene with high selectivity. This localized chemical transformation at the catalyst level achieves a high propylene/ethylene ratio by targeting specific C-H bond activation and preventing unwanted cracking reactions that produce ethylene in steam crackers.
Solution Approach 2:
The patent changes the reaction parameters from high-temperature steam cracking (which produces mixed olefins with low propylene/ethylene ratio) to controlled dehydrogenation conditions using metal oxide catalysts. This parameter change enables selective propylene production from propane with high selectivity and improved propylene/ethylene ratio while maintaining production capacity.
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 exhibits high activity, selectivity, and stability in dehydrogenating paraffins, with superior performance in propane dehydrogenation, offering a cost-effective and environmentally friendly alternative for propylene production.
Implementation Method 1
A mixed metal oxide catalyst composition comprising Transition Metals (Cu, Fe, Mn, Nb, Zn) supported on oxides of Al, Si, Ti, and Zr, with Rare Earth metals as stabilizers, characterized by specific activity, selectivity, and stability parameters, is developed for the dehydrogenation of paraffins
Implementation Method 2
A mixed metal oxide catalyst composition comprising Transition Metals (Cu, Fe, Mn, Nb, Zn) supported on oxides of Al, Si, Ti, and Zr
Data Source
AI summary
The invention relates to a catalyst composition suitable for the dehydrogenation of paraffins having 2-8 carbon atoms comprising zinc oxide and titanium dioxide, optionally further comprising oxides of cerium (Ce), dysprosium (Dy), erbium (Er), europium (Eu), gadolinium (Gd), lanthanum (La), neodymium (Nd), praseodymium (Pr), samarium (Sm), terbium (Tb), ytterbium (Yb), yttrium (Y), tungsten (W) and Zirconium (Zr) or mixtures thereof, wherein said catalyst composition is substantially free of chromium and platinum. The catalysts possess unique combinations of activity, selectivity, and stability. Methods for preparing improved dehydrogenation catalysts and a process for dehydrogenating paraffins having 2-8 carbon atoms, comprising contacting the mixed metal oxide catalyst with paraffins are also described. The catalyst may also be disposed on a porous support in an attrition-resistant form and used in a fluidized bed reactor.