Silicon-Phosphorus-Calcium Catalyst for Biomass Gasification
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Solution Overview
Problem
Conventional biomass gasification in fluidized bed reactors produces significant byproducts such as char, tar, and ash, leading to reduced efficiency and fouling issues, which are costly and difficult to manage, especially when tar mixes with water in gas cleaning systems.
Innovation Solution
A catalyst with specific compositions, such as silicon-phosphorus-calcium-containing composite oxides, is used in a fluidized bed reactor to inhibit byproduct formation and enhance gasification efficiency, prepared by immersing industrial byproducts in a phosphorus-containing solution and subjecting them to an annealing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluidized bed gasification is used, then syngas production is achieved, but byproduct formation (char, tar, ash) increases leading to reduced efficiency and fouling
Solution Approach 1:
The patent changes the chemical composition parameters of the gasification system by introducing a specific catalyst containing Si, P, Ca, Fe, and other elements in controlled proportions. This catalyst modifies the reaction parameters to favor syngas production while suppressing byproduct formation, directly resolving the contradiction between productivity and harmful factors
Solution Approach 2:
The patent employs a composite catalyst material combining multiple elements (Si, P, Ca, Fe, and optional Mg, Al, Mn, Ti, K, S) in specific weight ratios. This composite structure creates synergistic effects that enhance gasification efficiency while simultaneously reducing tar and char formation, addressing both improving and worsening features
2Ease of manufacture
If tar is condensed and mixed with water in gas cleaning systems, then gas cleaning is achieved, but water treatment problems arise that are costly and difficult to solve
Solution Approach 1:
The patent converts the harmful effect of tar condensation into a beneficial outcome by using the catalyst to prevent tar formation in the first place. The catalyst promotes complete gasification reactions that minimize tar production, thereby eliminating the need for complex water treatment systems while maintaining effective gas cleaning
3Ease of manufacture
If industrial byproducts are used as catalyst materials, then production cost is reduced, but catalyst performance and composition control become challenging
Solution Approach 1:
The patent establishes specific parameter ranges for catalyst composition (Si: 4-6wt%, P: 5-10wt%, Ca: 25-35wt%, Fe: 8-21wt%) that balance cost-effectiveness of industrial byproduct usage with required catalytic performance. These controlled parameters ensure consistent gasification efficiency while allowing flexibility in material sourcing
Solution Approach 2:
The patent creates a composite catalyst system where multiple elements work synergistically, allowing the use of various industrial byproducts containing these elements. The composite nature provides tolerance to variations in individual component sources while maintaining overall catalytic function, resolving the contradiction between cost reduction and composition control
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 effectively reduces byproduct formation, enhancing hydrocarbon conversion efficiency and lowering production costs by using readily available and inexpensive industrial byproducts, with gasification conversion efficiencies ranging from 25% to 58% and a heating value of 3-18 MJ/Nm³ for the syngas.
Implementation Method 1
a solution includes a phosphorus-containing compound dissolved in a solvent
Implementation Method 2
the mixture is dried to remove the solvent
Implementation Method 3
The solid is subjected to an annealing process to obtain the catalyst of the disclosure
Implementation Method 4
A heating process is performed to convert the carbon source into a syngas by means of the catalyst
Data Source
AI summary
A catalyst, a method for preparing the catalyst, and a method for preparing a syngas are provided. The catalyst meets one of the following two conditions (1) and (2): (1) 4wt%-6wt% of Si, 5wt.%-10wt.% of P, 25wt.%-35wt.% of Ca, 8wt.%-21wt.% of Fe, 36wt.%-41wt.% of O, and 0.1wt.%-5wt.% of Mg, Al, Mn, or a combination thereof, based on the weight of the catalyst; and (2) 3wt%-6wt.% of Al, 6wt.%-8wt.% of Si, 12wt.%-16wt.% of P, 28wt.%-32wt.% of Ca, 38wt.%-50wt.% of O, and 0.1wt.%-3wt.% of Mg, S, K, Ti, Mn, Fe, or a combination thereof, based on the weight of the catalyst. The catalyst is prepared by immersing steel slag into a solution of a phosphorus-containing compound. It is used in the preparation of syngas.