Spherical Group IVb Oxide Catalyst Supports With Low Pressure Drop
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Solution Overview
Problem
Existing catalyst supports based on Group IVb metal oxides, such as titanium dioxide and zirconium dioxide, face challenges in achieving high purity, uniform sphericity, low diameter standard deviation, high porosity, BET surface area, and good mechanical properties, while maintaining low abrasion loss and pressure drop.
Innovation Solution
A manufacturing process involving wet chemical production, extrusion, spheronization, and calcination is employed to create spherical catalyst supports with precise diameter control, high porosity, and improved mechanical properties, using pure or doped Group IVb metal oxides with minimal inorganic binders, ensuring purity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalysts are dispersed on high surface area supports to improve activity, then catalytic activity increases, but pressure drop across the bed increases and fluidization becomes difficult
Solution Approach 1:
The catalyst system is segmented into discrete spherical particles with controlled size distribution (0.5-2.0 mm diameter), allowing individual particles to maintain high surface area for catalysis while the collective bed maintains adequate fluidization properties through proper particle size selection
Solution Approach 2:
The support material parameters are optimized by selecting specific surface area between 100-500 m²/g and pore volume 0.3-0.8 cm³/g, creating spherical particles with controlled density and size that balance catalytic activity requirements with fluidization operational requirements
2Ease of operation
If catalyst particles are made smaller to improve fluidization, then fluidization improves, but pressure drop increases and catalyst loss increases
Solution Approach 1:
The patent specifies a dynamic particle size distribution range (0.5-2.0 mm) rather than a single size, allowing the system to adapt fluidization behavior through size variation while maintaining particles large enough to minimize entrainment losses during fluidization operations
3Stability of the object's composition
If mechanical strength of catalyst particles is increased to reduce breakage, then catalyst stability improves, but surface area decreases and activity reduces
Solution Approach 1:
The catalyst is formulated as a composite material comprising active metal oxide components (0.5-5 wt% of group IVB metal oxide) supported on a high surface area support material (100-500 m²/g), creating a structure where the support provides mechanical strength while the high surface area maintains catalytic activity
Solution Approach 2:
The catalyst particles exhibit local quality differentiation where the outer surface and internal pore structures are optimized for catalytic function with high surface area, while the overall spherical particle structure and support matrix provide the necessary mechanical strength and stability
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 resulting spheres exhibit superior mechanical properties, low abrasion loss, and optimal reactor void volume, with BET surface areas comparable to or exceeding commercial extrudates, facilitating efficient catalyst impregnation and reducing pressure drop.
Implementation Method 1
supports having a surface area of from 100 to 500 m2/g and a pore volume of from 0.3 to 0.8 cm3/g
Implementation Method 2
pore volume of from 0.3 to 0.8 cm3/g
Implementation Method 3
fluidized catalytic cracking
Implementation Method 4
catalytic cracking of hydrocarbons
Data Source
AI summary
In the field of supports for catalysts, as a consequence of the development of new processes, there is considerable demand for matrices that are alternative to alumina and silica; the aim of the present invention is to create a spherical catalyst or a support for the catalyst which is based on metal oxides of group IVb (in particular titanium dioxide, zirconium dioxide or doped versions) that has high purity, good sphericity and reduced standard deviation on the measured diameter; moreover, the spherical catalyst or support for catalyst must have a high porosity and BET surface area and at the same time good mechanical properties; the spherical support is required in many chemical processes to facilitate the process itself or simply to avoid modifying the structure of the reactor.