Hydrodesulfurization Catalyst with Al-Si-Ti Carrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hydrodesulfurization catalysts face challenges in maintaining high desulfurization performance over a long period, as they tend to degrade quickly under high-temperature and high-pressure conditions, which affects their efficiency in removing sulfur from hydrocarbon oils.
Innovation Solution
A hydrodesulfurization catalyst comprising an inorganic oxide carrier with Si, Ti, and Al, and a metal component such as molybdenum, tungsten, cobalt, or nickel, with specific surface area and pore volume characteristics, and a production method involving the mixing of mineral acid and basic aluminum salts to create a carrier precursor that is calcined and impregnated with metal components, ensuring high dispersibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrodesulfurization catalysts are used to achieve high desulfurization performance, then the initial activity is high, but the catalyst degrades quickly under high-temperature and high-pressure conditions
Solution Approach 1:
The patent uses a composite inorganic oxide carrier containing Al2O3, SiO2, and TiO2 in specific proportions (Al2O3: 50-90 wt%, SiO2: 5-30 wt%, TiO2: 10-40 wt%). This composite structure combines the high surface area and porosity of alumina with the structural stability of silica and the phot catalytic activity of titania, creating a carrier that maintains catalyst activity and stability under harsh hydrodesulfurization conditions for extended periods
Solution Approach 2:
The patent optimizes specific parameters including the Al2O3/SiO2/TiO2 ratio, surface area (150-450 m2/g), pore volume (0.30-0.80 ml/g), and TiO2 crystal structure (predominantly anatase phase). These parameter optimizations ensure the carrier maintains structural integrity and catalytic activity under high-temperature and high-pressure conditions, preventing rapid degradation while sustaining high desulfurization performance
2Ease of manufacture
If the inorganic oxide carrier has high surface area and pore volume for high dispersibility, then the metal component dispersibility is improved, but the mechanical strength may be reduced
Solution Approach 1:
The patent creates a composite inorganic oxide carrier where Al2O3 provides high surface area (150-450 m2/g) and pore volume (0.30-0.80 ml/g) for excellent metal component dispersibility, while SiO2 and TiO2 contribute to mechanical strength and structural stability. This composite approach allows simultaneous achievement of high dispersibility and adequate mechanical strength
Solution Approach 2:
The patent creates different functional zones within the carrier structure: the Al2O3-rich regions provide high surface area and porosity for metal component dispersion, while SiO2 and TiO2 phases provide structural framework and mechanical strength. This local differentiation of properties allows the carrier to simultaneously achieve high dispersibility and adequate mechanical strength
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 and stable desulfurization performance, effectively retaining its activity over a long period even under harsh conditions, thereby meeting stringent sulfur content regulations in fuel oils.
Implementation Method 1
an absorption edge wavelength of an absorption peak from Ti is 364 nm or shorter as measured by ultraviolet spectroscopy
Implementation Method 2
a step of calcining the carrier precursor to obtain a carrier
Implementation Method 3
a step of making the carrier to carry at least one metal component selected from the group consisting of group 6 elements, group 8 elements, group 9 elements and group 10 elements
Data Source
AI summary
Provided is a hydrodesulfurization catalyst for hydrocarbon oil, the catalyst comprising: an inorganic oxide carrier comprising Si, Ti and Al; and at least one metal component, carried on the inorganic oxide carrier, being selected from the group consisting of group 6 elements, group 8 elements, group 9 elements and group 10 elements, wherein the content of Al in the inorganic oxide carrier is 50% by mass or higher in terms of Al2O3; the content of Si therein is 1.0 to 10% by mass in terms of SiO2; and the content of Ti therein is 12 to 28% by mass in terms of TiO2; and in the inorganic oxide carrier, the absorption edge wavelength of an absorption peak from Ti is 364 nm or shorter as measured by ultraviolet spectroscopy.