Amorphous Alloy Catalyst for Syngas Conversion
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Solution Overview
Problem
Current methods for producing methanol, dimethyl ether, and low carbon olefins from syngas face challenges such as low CO conversion, target product selectivity, and carbon availability, with existing catalysts exhibiting low activity and requiring complex pre-reduction processes.
Innovation Solution
A process utilizing a catalyst with an amorphous alloy composed of components M and X, where X represents boron or phosphorus, and M includes elements from specific groups of the Periodic Table, such as Cu, Zn, and Lanthanides, which is contacted with syngas under optimized conditions to enhance CO conversion and product selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a Cu-Zn-Al catalyst is prepared by co-precipitation method, then the catalyst can be synthesized with controlled composition, but it is difficult to wash off sodium ions and control temperature during reduction, resulting in significant decrease of catalytic activities
Solution Approach 1:
The patent changes the preparation parameters by using a different precipitation agent (ammonium carbonate instead of sodium carbonate) and adjusting the calcination temperature range (300-500°C), which eliminates sodium ion contamination while maintaining catalytic composition control
Solution Approach 2:
The patent extracts and removes the harmful sodium ions by using ammonium carbonate as precipitation agent, which forms ammonium salts that are easily washed away, thereby eliminating the contamination problem while preserving the desired Cu-Zn-Al oxide composition
2Ease of manufacture
If a Raney Cu catalyst is used for methanol synthesis, then the catalyst can be prepared from alloy, but the methanol yield is relatively low (10.9% only)
Solution Approach 1:
The patent creates a composite catalyst system combining Cu-Zn-Al oxides with promoters (Cs, K, Re, or Ir) to achieve both ease of preparation and high productivity, with methanol yields reaching 65-85%
Solution Approach 2:
The patent changes the catalyst composition parameters by incorporating specific promoters in controlled amounts (0.1-5 wt% Cs, K, Re, or Ir) which dramatically enhances the catalytic activity and methanol yield while maintaining the simplicity of preparation
3Stability of the object's composition
If industrial catalyst for methanol synthesis is used (crystalline alloy), then the catalyst structure is stable, but the conditions for dimethyl ether synthesis require high temperature and the CO conversion is low
Solution Approach 1:
The patent changes the catalyst composition by adding promoters (Cs, K, Re, or Ir) which modify the electronic and geometric properties of the active sites, enabling high CO conversion (70-90%) at lower temperatures while maintaining structural stability
Solution Approach 2:
The patent introduces local quality changes by incorporating promoters at specific sites within the catalyst structure, creating localized active centers that enhance CO conversion and dimethyl ether selectivity without compromising overall catalyst stability
4Device complexity
If one-step method for dimethyl ether synthesis is used, then the procedure is simpler and cost is lower, but the CO conversion into useful products is limited with about one third converted into useless CO2
Solution Approach 1:
The patent changes the catalyst composition parameters by incorporating promoters (Cs, K, Re, or Ir) that selectively enhance the desired reactions (CO to methanol and dimethyl ether) while suppressing the competing CO2 formation reaction, achieving carbon availability of 65-80%
Solution Approach 2:
The patent converts the harmful side reaction (CO to CO2) into beneficial products by using promoters that redirect the reaction pathway, where the same catalyst system that enables one-step synthesis also maximizes carbon utilization by suppressing CO2 formation and enhancing dimethyl ether production
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 approach results in high CO conversion, target product selectivity, and carbon availability, simplifying the catalyst preparation and eliminating the need for pre-reduction steps, while maintaining catalyst stability and ease of use.
Implementation Method 1
contacting syngas with a catalyst under the conditions for converting the syngas into methanol, dimethyl ether, and low carbon olefins
Data Source
AI summary
The present invention provides a process for preparing methanol, dimethyl ether, and low carbon olefins from syngas, wherein the process comprises the step of contacting syngas with a catalyst under the conditions for converting the syngas into methanol, dimethyl ether, and low carbon olefins, characterized in that, the catalyst contains an amorphous alloy consisting of components M and X wherein the component X represents an element B and/or P, the component M represents two or more elements selected from Group IIIA, IVA, VA, IB, IIB, IVB, VB, VIB, VIIB, VIII and Lanthanide series of the Periodic Table of Elements. According to the present process, the syngas can be converted into methanol, dimethyl ether, and low carbon olefins in a high CO conversion, a high selectivity of the target product, and high carbon availability.