Pd-Ga Liquid Alloy Catalyst for Acetylene Hydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional nano-Ga—Pd supported SiO2 catalysts used for acetylene removal in ethylene polymerization have poor ethylene selectivity, which affects the quality of polyethylene products.
Innovation Solution
An activated carbon/palladium-gallium (Pd—Ga) liquid alloy composite catalyst is developed, where acid washed activated carbon supports a Pd—Ga liquid alloy, forming a self-protective oxide layer that enhances catalytic performance and ethylene selectivity by preventing deep hydrogenation of acetylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nano-Ga-Pd supported SiO2 catalyst is used for acetylene removal, then acetylene conversion rate increases, but ethylene selectivity deteriorates
Solution Approach 1:
The invention changes the support material from SiO2 to activated carbon, and modifies the metal component from solid Ga-Pd to liquid alloy Pd-Ga. This parameter change transforms the catalyst's surface properties and electronic structure, enabling it to achieve both high acetylene conversion (99.8%) and high ethylene selectivity (98.9%) by controlling the hydrogenation reaction pathway
Solution Approach 2:
The invention creates a composite catalyst system combining activated carbon support with Pd-Ga liquid alloy. The composite structure leverages the high surface area and porous structure of activated carbon alongside the unique catalytic properties of the liquid alloy, achieving synergistic effects that resolve the contradiction between conversion rate and selectivity
2Productivity
If conventional hydrogenation catalyst is used to remove acetylene, then acetylene conversion improves, but catalyst poisoning by acetylene mixed in feed gas occurs
Solution Approach 1:
The invention uses activated carbon as a support material that can be easily regenerated and replaced if needed. The activated carbon support provides high surface area and porosity that facilitates acetylene removal while maintaining catalyst stability, acting as a disposable yet effective support that prevents catalyst poisoning
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 acetylene conversion rate of 99.8% with ethylene selectivity of 98.9% during acetylene hydrogenation, improving the quality of ethylene polymerization products.
Implementation Method 1
The active component Pd—Ga, present in the form of liquid alloy, forms a self-protective oxide layer. This protects acetylene from secondary reactions on the surface of the catalyst, inhibits or reduces acetylene to deeply hydrogenate to form ethane
Implementation Method 2
selective catalytic hydrogenation features less pollution and lower energy consumption and has a good effect on acetylene removal
Implementation Method 3
the core primarily lies in the selection of a hydrogenation catalyst
Implementation Method 4
Because of more surface functional groups, the present invention selects the acid washed activated carbon to increase the binding ability of the support to the active component
Data Source
AI summary
An activated carbon/palladium-gallium (Pd—Ga) liquid alloy composite catalyst, including a support and an active component supported on the support. The support is acid washed activated carbon. The active component is Pd—Ga liquid alloy. In the present invention, the active component Pd—Ga, present in the form of liquid alloy, forms a self-protective oxide layer. This protects acetylene from secondary reactions on the surface of the catalyst, inhibits or reduces acetylene to deeply hydrogenate to form ethane, thereby increasing ethylene selectivity. The present invention further provides a preparation method of the catalyst, where the catalyst of the present invention is prepared by immersion. The preparation method is simple and easy to operate. When the activated carbon/Pd—Ga liquid alloy composite catalyst provided by the present invention is used for acetylene hydrogenation to prepare ethylene, conversion rate of acetylene is as high as 99.8%, while the ethylene selectivity is as high as 98.9%.