USY Zeolite Hydrorefining Catalyst Isomerization
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Solution Overview
Problem
Current hydrorefining methods fail to simultaneously isomerize normal paraffins and reduce oxygen-containing compounds in fuel stocks while maintaining fuel stock yields, as existing catalysts either decompose the fuel or do not effectively convert oxygen-containing compounds.
Innovation Solution
A hydrorefining method involving a catalyst with USY zeolite and specific solid acids, combined with metals from Group VIb and VIII, is used to contact fuel stocks containing normal paraffins and oxygen-containing compounds in the presence of hydrogen, allowing for effective conversion of oxygen-containing compounds to paraffins and isomerization of normal paraffins while preventing fuel stock lightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrorefining is performed to convert normal paraffins to isoparaffins, then octane numbers and cold flow properties are improved, but fuel stock yields decrease due to decomposition
Solution Approach 1:
The invention changes the chemical parameters of the catalyst system by combining specific metal components (Mo, Co, Ni, Pt, Pd) with USY zeolite support, creating a bifunctional catalyst that operates at lower temperatures to achieve isomerization without decomposition, thus improving fuel quality while maintaining yields
Solution Approach 2:
The invention uses a composite catalyst material consisting of metal sulfides or metal oxides supported on USY zeolite, combining the hydrodesulfurization activity of metals with the isomerization activity of zeolite, enabling simultaneous conversion of normal paraffins to isoparaffins while preventing fuel stock decomposition
2Quantity of substance
If existing catalysts are used for hydrorefining, then normal paraffin conversion is achieved, but oxygen-containing compounds are not effectively reduced
Solution Approach 1:
The invention creates a universal catalyst system that performs multiple functions simultaneously: hydrodesulfurization, isomerization of normal paraffins, and removal/conversion of oxygen-containing compounds, thereby improving both conversion rate and oxidation stability
Solution Approach 2:
The USY zeolite support acts as an intermediary that facilitates the interaction between metal catalyst components and various fuel constituents, enabling effective conversion of oxygen-containing compounds through acid-catalyzed reactions while maintaining metal-catalyzed hydrodesulfurization 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
This method achieves simultaneous isomerization of normal paraffins and reduction of oxygen-containing compounds in fuel stocks, maintaining fuel stock yields and preventing lightening, thereby improving the octane numbers and cold flow properties of the fuel.
Implementation Method 1
contacting, in the presence of hydrogen, a fuel stock comprising normal paraffins and oxygen-containing compounds, with a hydrorefining catalyst comprising a support containing USY zeolite and at least one solid acid selected from among silica-alumina, alumina-boria, silica-zirconia, silica-magnesia and silica-titania, and at least one metal selected from among metals of Group VIb and metals of Group VIII of the Periodic Table supported on the support
Implementation Method 2
effective conversion of the oxygen-containing compounds such as alcohols in the fuel stock to paraffins
Implementation Method 3
effective conversion (isomerization) of the normal paraffins derived from the oxygen-containing compounds and the normal paraffins originally present in the fuel stock
Implementation Method 4
sufficiently inhibit lightening of the fuel stock that occurs with conversion of the oxygen-containing compounds to paraffins and isomerization to normal paraffins
Data Source
AI summary
The hydrorefining method of the invention is characterized by contacting, in the presence of hydrogen, a fuel stock comprising normal paraffins and oxygen-containing compounds, with a hydrorefining catalyst comprising a support containing USY zeolite and at least one solid acid selected from among silica-alumina, alumina-boria, silica-zirconia, silica-magnesia and silica-titania, and at least one metal selected from among metals of Group VIb and metals of Group VIII of the Periodic Table supported on the support.