Modified Zeolite Beta Catalyst for Hydrocracking Ammonia Tolerance
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Solution Overview
Problem
Current hydrocracking catalysts face challenges in achieving superior overall activity, selectivity, and stability for producing gasoline and middle distillates, particularly due to the interference of ammonia in zeolite catalysts, which requires severe operating conditions and affects product distribution.
Innovation Solution
The use of modified zeolite beta with specific acidity indices, combined with amorphous inorganic refractory oxides and hydrogenation components, as a catalyst support to enhance hydrocracking efficiency and selectivity for middle distillates, reducing the impact of ammonia and optimizing operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Y zeolite catalysts are used in hydrocracking, then catalytic activity is achieved, but ammonia interference occurs requiring severe operating conditions and affecting product distribution
Solution Approach 1:
The patent applies parameter changes by modifying the zeolite structure (transitioning from Y-zeolite to beta-zeolite with specific Si/Al ratios), changing the acidity parameters (NH3-TPD and IEC values), and adjusting metal component loading to optimize catalytic performance while reducing ammonia interference
Solution Approach 2:
The patent employs composite materials by combining beta-zeolite with amorphous inorganic oxides (alumina, silica-alumina) and metal hydrogenation components (Group VIII and Group VIB metals) to create a multifunctional catalyst that simultaneously provides acid catalysis, hydrogenation, and ammonia tolerance
2Productivity
If severe operating conditions are used to overcome ammonia interference, then catalytic activity is maintained, but energy consumption increases and selectivity decreases
Solution Approach 1:
The patent changes the catalyst parameters (beta-zeolite structure, Si/Al ratio, metal content) to enable milder operating conditions while maintaining high conversion rates, thereby reducing energy consumption and improving selectivity
3Productivity
If traditional catalyst compositions are used, then hydrocracking activity is achieved, but selectivity for middle distillates is insufficient
Solution Approach 1:
The patent applies local quality by creating specific active sites with controlled acidity and metal distribution within the beta-zeolite structure, and by using amorphous oxides as a matrix to provide localized hydrogenation functions, thereby achieving high selectivity for middle distillates while maintaining overall catalytic 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 modified zeolite beta catalysts demonstrate increased selectivity and stability for middle distillate production, achieving higher conversion rates and improved product distribution compared to traditional Y zeolite catalysts, with superior performance in hydrocracking processes.
Implementation Method 1
catalytic compositions comprising beta zeolite and a hydrogenation component and their use in hydrocracking of hydrocarbons
Implementation Method 2
the organonitrogen components and the organosulphur components contained in the feedstock are converted to ammonia and hydrogen sulphide, respectively
Data Source
AI summary
A hydrocarbon conversion catalyst comprising a modified beta zeolite, an amorphous inorganic oxide and a hydrogenation component wherein the said catalyst support has an NH3-AI of less than 3.5 and/or an IEC-AI of less than 3.7.