Porous Spherical Titanium Dioxide for Stable Catalysis
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Solution Overview
Problem
Porous metal oxide particles, particularly titanium dioxide, are unstable under pressure and in aqueous solvent systems, leading to particle fracture and clumping, which complicates their use in large-scale processes like Fischer-Tropsch and chromatography due to poor stability and pore size distribution.
Innovation Solution
A chemically and physically stable porous spherical titanium dioxide material with a TiO2 content of at least 99% by weight, optimized particle size distribution, and pore structure, produced without additives or binders, using a spray drying process that maintains stability under supercritical and hydrothermal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If porous metal oxide particles are used in aqueous solvent systems, then the material can be applied in chemical and catalytic processes, but the particles become unstable and rehydrate the metal oxide surface
Solution Approach 1:
The patent applies parameter changes by carefully controlling the pore size (1-30 nm) and pore volume (0.1-0.4 cm³/g) of the titanium dioxide particles. These specific parameter ranges optimize both the chemical reactivity needed for catalytic processes and the structural stability to prevent rehydration. The narrow particle size distribution (B90/10 ≤ 120 μm) is also controlled as a key parameter to maintain particle integrity in aqueous systems.
Solution Approach 2:
The patent creates a composite structure within the titanium dioxide particles by forming a stable porous network that resists rehydration. The material combines high TiO2 content (>99% by weight) with a controlled porous structure, creating a composite-like architecture that maintains both reactivity and stability. The spherical particle morphology with specific size distribution also contributes to this composite structural stability.
2Productivity
If pressure is applied to porous metal oxide particles, then the material can be used in fixed bed processes, but particle fractures occur and fine particles are created
Solution Approach 1:
The patent optimizes the particle size parameters (d50: 30-350 μm, B90/10 ≤ 120 μm) to achieve a balance between flow characteristics in fixed beds and resistance to fracture under pressure. The spherical morphology and controlled pore structure enhance mechanical strength while maintaining the productivity needed for industrial fixed bed processes.
Solution Approach 2:
The patent prepares the titanium dioxide particles with a pre-strengthened porous structure before they are subjected to pressure in fixed bed processes. The controlled pore size and volume create a resilient internal structure that cushions against mechanical stress, preventing fracture and fine particle generation during operation.
3Productivity
If the pore size is increased to improve reactivity, then catalytic activity increases, but particle stability decreases and fine grain formation occurs
Solution Approach 1:
The patent precisely controls the pore size parameter within the range of 1-30 nm to optimize the balance between catalytic reactivity and hydrothermal stability. This specific pore size range provides sufficient surface area and accessibility for catalytic reactions while maintaining the structural integrity needed to prevent fine grain formation under hydrothermal conditions (>40 bar, >250°C).
Solution Approach 2:
The patent creates local quality variations within the particle structure by having a distributed pore size network rather than uniform pores. This allows different regions of the particle to serve different functions - smaller pores provide structural stability while larger pores within the 1-30 nm range provide catalytic activity, achieving both reactivity and reliability simultaneously.
4Strength
If binders and organic compounds are added during production to improve particle strength, then particle stability improves, but chemical purity decreases and stability is compromised
Solution Approach 1:
The patent extracts or eliminates binders and organic compounds from the production process entirely. By using a binder-free approach with carefully controlled drying and sintering parameters, the patent achieves particle strength without compromising chemical purity. The high TiO2 content (>99% by weight) is maintained by removing all additive residues through the production process.
Solution Approach 2:
The patent enables the titanium dioxide particles to self-strengthen through controlled sintering and pore structure formation without requiring external binders. The particles develop intrinsic mechanical strength through their porous network structure and spherical morphology, eliminating the need for organic additives that would compromise chemical purity and long-term 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 material exhibits enhanced mechanical and chemical stability across a wide pH range, preventing particle clumping and maintaining flow in multi-phase systems, making it suitable for applications in chromatography and catalysis without the need for additional processing steps.
Implementation Method 1
sprayed into a spray tower, in which the solvent thus evaporates
Implementation Method 2
a porous, spherical titanium dioxide with a TiO 2 content of at least 99.0% by weight, and with a pore diameter of 1 to 30 nm, a pore volume of at least 0.1 cm 3/g
Data Source
Figure 1~2
AI summary
The invention relates to a novel titanium dioxide material, processes for the production thereof and its use as support material in multiphase systems.