Hydrotreating Catalyst Carbonaceous Substance
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Solution Overview
Problem
Existing hydrotreating catalysts face challenges in balancing high hydro-isomerization activity with suppressed cracking activity, leading to insufficient improvement in cold flow properties and yield of middle distillate in the GTL process.
Innovation Solution
A hydrotreating catalyst comprising an amorphous composite metal oxide with solid acidity and noble metals from Group 8 to Group 10, incorporating a carbonaceous substance derived from organic compounds, which selectively inhibits cracking activity while maintaining high hydro-isomerization activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cracking activity of the hydrotreating catalyst is suppressed by weakening solid acidity, then the yield of middle distillate is improved, but the hydro-isomerization activity is also reduced, resulting in insufficient improvement in cold flow property
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the catalyst structure. The catalyst support contains both high-acidity regions (for hydro-isomerization) and low-acidity regions (for suppressing cracking). This is achieved by using a composite structure with different metal oxide components having different acidity levels, allowing each region to perform its specific function optimally without interfering with the other.
Solution Approach 2:
The patent employs composite materials by combining multiple metal oxides (such as Al2O3, SiO2, TiO2, ZrO2, or B2O3) in specific ratios to create a catalyst support with tailored acidity characteristics. This composite structure enables simultaneous optimization of hydro-isomerization activity and cracking suppression, resolving the contradiction between yield improvement and cold flow property enhancement.
2Productivity
If the cracking activity is enhanced to improve catalyst performance, then the conversion of hydrocarbons is improved, but the yield of middle distillate is reduced due to production of light fraction
Solution Approach 1:
The patent applies parameter changes by precisely controlling the acidity parameters of the catalyst support through adjustment of metal oxide ratios and addition of metal components. By optimizing these parameters, the catalyst achieves high conversion activity while minimizing excessive cracking that would produce light fractions and reduce middle distillate yield.
Solution Approach 2:
The patent introduces metal components (such as Pt, Pd, Ni, Co, or Mo) as intermediaries that facilitate hydrocarbon conversion while controlling the cracking reaction. These metal components act as mediators that promote desired conversion pathways while suppressing unwanted cracking, thereby maintaining high productivity without sacrificing middle distillate yield.
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 achieves a high yield of middle distillate with excellent cold flow properties by converting straight-chain aliphatic hydrocarbons to branched-chain hydrocarbons, enhancing the cold flow properties and yield of the middle distillate.
Implementation Method 1
a hydrotreating catalyst comprising a catalyst support comprising an amorphous composite metal oxide having solid acidity, and at least one active metal supported by the catalyst support and selected from noble metals of Group 8 to Group 10 in the periodic table
Implementation Method 2
hydrocarbons are synthesized from this synthesis gas by a Fischer-Tropsch synthesis reaction... and the hydrocarbons are further refined by hydroprocessing
Implementation Method 3
a catalyst support having solid acidity such as zeolite and/or an amorphous composite metal oxide
Data Source
AI summary
The hydrotreating catalyst of the present invention is a hydrotreating catalyst including a catalyst support including an amorphous composite metal oxide having solid acidity, and at least one active metal supported by the catalyst support and selected from noble metals of Group 8 to Group 10 in the periodic table, wherein the hydrotreating catalyst contains a carbonaceous substance including a carbon atom, and the content of the carbonaceous substance in the hydrotreating catalyst is 0.05 to 1% by mass in terms of the carbon atom.