Base-Treated Hydroxyapatite Catalysts for Ethanol Conversion

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Solution Overview

Problem

Current methods for producing 1-butanol from ethanol using catalysts like calcium phosphates and hydroxyapatites face challenges in achieving high conversion rates, selectivity, and long catalytic lifetimes, which are essential for economic and efficient production of alternative fuels.

Innovation Solution

The use of hydroxyapatite catalyst compositions comprising magnesium, calcium, strontium, and barium cations, which are treated with a base to enhance their performance in converting ethanol to 1-butanol, offering improved activity and selectivity under specific temperature and pressure conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional calcium phosphate catalysts are used for ethanol conversion, then the process can proceed, but the catalytic activity and selectivity are insufficient

Engineering Contradiction:

Improveconversion rateVSAvoidcatalytic activity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the catalyst composition by changing the chemical parameters - specifically incorporating magnesium, strontium, and barium into the hydroxyapatite structure alongside calcium, and adjusting the Ca/Mg/Sr/Ba ratio to achieve optimal catalytic performance for ethanol conversion to 1-butanol

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite catalyst system by combining multiple metal cations (Ca, Mg, Sr, Ba) within the hydroxyapatite crystal structure, forming a multi-element catalyst composition that exhibits superior catalytic activity and selectivity compared to single-component calcium phosphate catalysts

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional catalysts are used, then ethanol conversion can occur, but the catalytic lifetime is short

Engineering Contradiction:

Improveconversion rateVSAvoidcatalytic lifetime

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent extends catalytic lifetime by modifying the chemical composition parameters of the catalyst - specifically incorporating alkaline earth metals (Mg, Sr, Ba) into the hydroxyapatite structure, which enhances the structural stability and resistance to deactivation of the catalyst during prolonged operation

Inventive Principle:

Principle #35Parameter changes

3Productivity

If conventional catalysts are used, then 1-butanol can be produced, but selectivity is poor with high byproduct formation

Engineering Contradiction:

Improveproduction rateVSAvoidselectivity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent improves selectivity by adjusting the chemical composition parameters - specifically the ratio of Ca to alkaline earth metals (Mg, Sr, Ba) in the hydroxyapatite structure, which optimizes the catalytic sites to favor 1-butanol production while minimizing byproducts like alkenes and diethyl ether

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite catalyst system with multiple metal cations (Ca, Mg, Sr, Ba) in specific ratios within the hydroxyapatite structure, where the synergistic interaction of these elements provides enhanced selectivity for 1-butanol production by optimizing the electronic and geometric properties of the catalytic sites

Inventive Principle:

Principle #40Composite materials

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 base-treated hydroxyapatite catalysts demonstrate increased selectivity and longevity, leading to higher yields of 1-butanol with reduced production of byproducts like alkenes and diethyl ether, thus improving the economic viability of ethanol conversion processes.

Implementation Method 1

catalytic conversion of ethanol to a reaction product comprising 1-butanol using hydroxyapatite catalyst compositions

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

1-butanol can be prepared by condensation from ethanol over basic catalysts at high temperature using the so-called 'Guerbet Reaction'

Methodology Applied

Scientific EffectCondensation reaction:

Data Source

PatentUS8962896B2Conversion of ethanol to a reaction product comprising 1-butanol using hydroxyapatite catalysts

Publication Date: 2015.02.24 VIRIDIS CHEMICAL LLC

AI summary

Catalytic processes to produce a reaction product comprising 1-butanol by contacting a reactant comprising ethanol with a catalyst composition under suitable reaction conditions are provided. The catalyst composition may comprise a hydroxyapatite of the Formula (MwM′xM″yM′″z)5(PO4)3(OH), wherein M is Mg; M′ is Ca; M″ is Sr; M′″ is Ba; w is any number between 0 and 1 inclusive; x is any number from 0 to less than 0.5; y is any number between 0 and 1 inclusive; z is any number between 0 and 1 inclusive; and w+x+y+z=1. Base-treated catalyst compositions may be used. Also provided are processes for contacting an initial catalyst composition comprising the hydroxyapatite with a base to produce a base-treated catalyst composition, and the base-treated catalyst compositions so obtained.