Hydrocracking Catalyst Y and Beta Zeolite Jet Fuel Yield
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Solution Overview
Problem
Current hydrocracking catalysts for producing distillate and jet fuel lack superior activity, selectivity, and stability, which are essential for efficiently converting hydrocarbon feedstocks into desired petroleum products with optimal boiling point ranges.
Innovation Solution
A catalyst composition comprising a beta zeolite with a silica to alumina mole ratio of less than 30 and an SF6 adsorption capacity of at least 28 weight-percent, combined with a Y zeolite having a unit cell size of 24.37 to 24.43 angstroms, and a weight ratio of Y zeolite to beta zeolite ranging from 4 to 7, along with a metal hydrogenation component like nickel, cobalt, tungsten, or molybdenum, enhances activity and selectivity for hydrocracking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrocracking catalysts are used, then the hydrocracking process can proceed, but the activity, selectivity, and stability are insufficient for efficiently producing jet fuel and distillate
Solution Approach 1:
The patent employs a composite catalyst system combining Y zeolite and beta zeolite with a hydrogenation component. The Y zeolite provides cracking activity with controlled pore structure (unit cell size 24.37-24.43 Å), while the beta zeolite (silica to alumina mole ratio <30, SF6 adsorption capacity ≥28 wt%) contributes additional cracking functionality and stability. This composite structure resolves the contradiction by achieving both high reliability (activity/stability) and high productivity (production efficiency) through synergistic interaction of multiple materials.
2Productivity
If the catalyst composition is optimized for high activity, then the conversion rate improves, but the selectivity for desired product ranges may be compromised
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different zeolite components within the catalyst. The Y zeolite with specific unit cell size (24.37-24.43 Å) is optimized for producing jet fuel range products (127-288°C), while the beta zeolite with controlled silica to alumina ratio (<30) and high SF6 adsorption capacity (≥28 wt%) contributes to distillate range production (149-371°C). This localized functional differentiation enables the catalyst to achieve both high conversion rate and precise product selectivity simultaneously.
3Stability of the object's composition
If the silica to alumina ratio of beta zeolite is increased to improve stability, then the catalyst lifespan extends, but the SF6 adsorption capacity and cracking activity may decrease
Solution Approach 1:
The patent optimizes the silica to alumina mole ratio of beta zeolite to be less than 30, which represents a specific parameter change from conventional high-silica beta zeolites. This parameter optimization achieves a balance where the catalyst maintains adequate stability while preserving high cracking activity (evidenced by SF6 adsorption capacity ≥28 wt%). The specific parameter range identified in the patent resolves the contradiction by finding the optimal point where both stability and activity are sufficiently high.
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 composition significantly improves the yield and activity for producing jet fuel and distillate, achieving a higher proportion of products within the desired boiling ranges, outperforming existing commercial catalysts in terms of activity and selectivity.
Implementation Method 1
a beta zeolite having an overall silica to alumina (SiO2 to Al2O3) mole ratio of less than 30 and a SF6 adsorption capacity of at least 28 weight-percent
Implementation Method 2
a metal hydrogenation component such as nickel, cobalt, tungsten, molybdenum, or any combination thereof
Data Source
AI summary
Increased yields of middle distillate and jet fuel and increased catalyst activity are obtained in a hydrocracking process by the use of a catalyst containing a beta zeolite and a Y zeolite having a unit cell size from 24.37 to 24.43 angstrom. The catalyst has a relatively high amount of Y zeolite relative to beta zeolite.