Titanium Oxide-Coated Catalyst Supports for Acidic Pyrolysis Oil
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Solution Overview
Problem
Biomass-derived pyrolysis oil's high acidity and oxygen content lead to rapid plugging and fouling of catalysts in hydrogenation reactors, and existing acid-resistant catalyst supports lack both strength and surface area, making them unsuitable for harsh processing environments.
Innovation Solution
Developing titanium oxide-coated inorganic powders with high surface areas, which are extruded into acid-resistant catalyst supports, providing strength and resistance to leaching in acidic environments, and impregnating them with metals like molybdenum, cobalt, or nickel for enhanced catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard catalyst supports (e.g., alumina) are used in hydrogenation reactors, then high surface area and strength are provided, but rapid plugging and fouling occur due to catalyst dissolution in harsh acidic environments
Solution Approach 1:
The patent employs a composite catalyst support structure consisting of alumina core particles coated with a shell of acid-resistant material (such as silica, titania, zirconia, or their mixtures). This composite design combines the high surface area and strength of alumina with the acid resistance of the coating material, preventing catalyst dissolution in the harsh acidic environment of pyrolysis oil hydrogenation while maintaining mechanical integrity and catalytic activity.
2Reliability
If acid-resistant catalyst supports (e.g., titania or zirconia) are used to resist leaching, then resistance to dissolution is improved, but both strength and surface area are reduced
Solution Approach 1:
The patent creates a composite support where acid-resistant materials (titania, zirconia, silica, or their mixtures) form a coating shell around a high-strength alumina core. This composite structure provides the acid resistance needed to prevent leaching in harsh environments while the alumina core maintains the mechanical strength and high surface area required for effective catalysis.
3Reliability
If acid-resistant catalyst supports (e.g., titania or zirconia) are used to prevent dissolution, then resistance to leaching is improved, but surface area is reduced
Solution Approach 1:
The patent utilizes a composite support structure with an alumina core that provides high surface area and a coating of acid-resistant material (silica, titania, zirconia, or mixtures) that prevents leaching. This composite design maintains the high surface area of alumina while adding the acid resistance of the coating, solving both requirements simultaneously.
4Productivity
If conventional catalysts are used for hydrogenation of pyrolysis oil, then catalytic activity is provided, but rapid plugging and fouling occur due to solid formation
Solution Approach 1:
The patent employs a composite catalyst support with alumina core and acid-resistant coating (silica, titania, zirconia, or mixtures) that prevents both the support dissolution and catalyst deactivation/fouling in harsh acidic environments. This composite structure maintains high catalytic activity while preventing plugging and fouling, thereby extending catalyst longevity.
Solution Approach 2:
The acid-resistant coating material acts as an intermediary protective layer between the catalytically active alumina and the harsh acidic environment of pyrolysis oil. This coating prevents direct contact between the acid and the alumina catalyst, thereby preventing dissolution, deactivation, and fouling while allowing the catalyst to maintain its activity.
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 titanium oxide-coated catalyst supports maintain stability and activity in harsh conditions, preventing leaching and fouling, and effectively convert oxygenated hydrocarbons in biomass-derived pyrolysis oil into hydrocarbons, improving the processing efficiency and longevity of catalysts.
Implementation Method 1
coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders
Implementation Method 2
preventing leaching and fouling, and effectively convert oxygenated hydrocarbons in biomass-derived pyrolysis oil into hydrocarbons
Implementation Method 3
impregnating them with metals like molybdenum, cobalt, or nickel for enhanced catalytic activity
Data Source
AI summary
A process for preparing a catalyst comprises coating substantial internal surfaces of porous inorganic powders with titanium oxide to form titanium oxide-coated inorganic powders. After the coating, an extrudate comprising the titanium oxide-coated inorganic powders is formed and calcined to form a catalyst support. Then, the catalyst support is impregnated with a solution containing one or more salts of metal selected from the group consisting of molybdenum, cobalt, and nickel.