lecture 13: carbon capture and utilization...co2conversion: thermodynamics co2 + cxhyoz h2o gibbs...

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André BardowEnergy & Process Systems EngineeringETH Zurich

17.05.2020

Lecture 13: Carbon Capture and UtilizationCO2 Capture and Storage (CCS) and the Industry of Carbon-Based Resources

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Background of the group

2007-2010: TU Delft2010-2020: RWTH Aachen University2018 – now: Forschungszentrum JülichNow: ETH Zürich

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From molecules to sustainable life cycles for energy & chemicals

PROCESS

ECO SYSTEM

SUPPLY CHAINS

Energy

Renewableenergy

O = C = O Carbon

biomasswastefossil ?

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From molecules to sustainable life cycles for energy & chemicals

PROCESS

MOLECULE

THERMODYNAMICS

ECO SYSTEM

SUPPLY CHAINS

Anal

ysis

(Dire

ctPr

oble

m)

Design (Inverse Problem

)computer-aidedmolecular & design

automatedexperiments

conceptual process& systems design

Life cycleassessment

Power-to-Storage

Power-to-Chemicals

Power-to-Heat

Carbon capture,utilization & storage

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Carbon Capture and Utilization (CCU)

CO2

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CO2 utilization – Saving the Climate ?The Problem:

CO2-EmissionsThe Solution :

Captain CCU!

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Thermodynamics of CO2 conversionEnergy

CO2

Reactants

minerals

CO2-based products

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CO2 utilization: The solution or a waste of time?

CO2-utilizationis always good !

CO2-utilization always bad !

vs.

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At the end of this lecture, you will be able to …

• analyze the thermodynamics of carbon capture & utilization (CCU)

• distinguish services offered by CCU

• evaluate CCU pathways based on the functional unit

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CO2

Reactants

minerals

CO2-based products

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CO2 conversion - Stoichiometry

Carbon dioxide

WaterProductsReactor

Balances:

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CO2 conversion - Stoichiometry

Carbon dioxide

Water

ProductsReactor

CO2 conversion starting from CO2 + water= inverted combustion

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CO2 conversion: Minimal energy demand

Carbon dioxide

Waterisothermal-isobaric

Reactor

Products

Energy balance:

0 in out tH H Q P

Entropy balance

0 irrin out

QS S ST

reversible out inQ T S S

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CO2 conversion: Minimal energy demand

revt out out in inP H TS H TS

0 revin out out in tH H T S S P

revt out inP G G „Gibbs energy “

R R RG H T S

from last slide:

> 0 = „energy supply needed“< 0 = „energy released“

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CO2 conversion: ThermodynamicsReaction proceeds without energy supply ifGibbs Energy

reactants

products

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CO2 conversion: Thermodynamics

CO2

+ CxHyOz

H2O

Gibbs energy

Molecule State / kJ/mol

O g 232

H g 203

C (Diamant) s 2,9

H2 g 0

O2 g 0

C (Graphit) s 0

NH3 g -16

CH4 g -51

CO g -137

CH3OH l -162

C2H5OH l -175

H2O g -229

H2O l -237

SO2 g -300

SO3 g -371

CO2 g -394H2SO4 l -690

0f G

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Minimal energy demand for CO2 conversionProduct

Methane CH4 801Acetlyene C2H2 1227Ethen C2H4 1314Ethane C2H6 1442Propane C3H8 2074Butane C4H10 2703Octane (l) C8H18 5219Ethanol (l) C2H6O 1301

CO2 conversion starting from CO2 + water= inverted combustion= intrinsically energy-demanding 17

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Minimal energy demand: CO2 conversion vs. CO2 captureProduct

Methane CH4 801 148 5,4Acetlyene C2H2 1227 296 4,1Ethen C2H4 1314 296 4,4Ethane C2H6 1442 296 4,9Propane C3H8 2074 445 4,7Butane C4H10 2703 593 4,6Octane (l) C8H18 5219 1186 4,4Ethanol (l) C2H6O 1301 296 4,4

CO2 conversion starting from CO2 + water= 4-5 times the minimal energy demand of direct air capture

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analyze the thermodynamics of carbon capture & utilization (CCU)

• distinguish services offered by CCU


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Good news for CCU : We do not care about thermodynamics

Oil39%

Gas21%

Electricity7%

Wood10%

District heating4%

Solar thermal0%

Heat pumps18%

Other1%

Residential Heating in CH (2017)

Data source: Bundesamt für Statistik

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The vision: A sustainable world

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https://www.dbb-nrw.de

https://www.bayika.de https://www.ingenieur.de

https://www.studium-ratgeber.de

A sustainable world is more than clean electricity

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CO2 utilization can contribute todefossilization of the material world

A sustainable world is more than clean electricityThe next challenge:

Defossilization of the material world

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Thermodynamics of CO2 conversion: 1. Inverting combustionEnergy

Chemicals & fuels

O = C = O

+ H2O

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Thermodynamics of CO2 conversion: 2. More efficient chemistryEnergy

Reactants

Chemicals & fuels

O = C = O

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Thermodynamics of CO2 conversion: 3. MineralizationEnergy

minerals

O = C = O

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Reactants

minerals

Chemicals & fuels

O = C = O

+ H2O

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Thermodynamics of CO2 conversion: 1. MineralizationEnergy

minerals

O = C = O

(Mg/Ca)XOYSiz + CO2 α (Mg/Ca)CO3+ β SiO2

Heat

HesamOstovari

storage utilization

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https://doi.org/10.1039/D0SE00190B

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The carbon footprint of CO2 mineralization to cement substitutes

stor

age

utiliz

atio

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The carbon footprint of CO2 mineralization to cement substitutes

stor

age

utiliz

atio

n

• CO2 mineralization combines storage + utilization• GHG savings possible – even today !• benefit from substitution of current materials• product development crucial

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Global cement production

Status Quo:• Cement Market:

4.5 Gt/year

• CO2e emissions: 3.6 Gt CO2e/year

Miller, Vanderley Pacca, Horvath, (2018): Cement and Concrete Research 114, 115–124.

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Thermodynamics of CO2 conversion: 2. More efficient chemistryEnergy

Reactants

Chemicals & fuels

O = C = O

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CO2-based polymers: Project “Dream Production“

Scrubbing and supply of CO2

Process development and conversion of CO2

Fundamental researchLife Cycle Assessment

Production and testing of polyurethanes with CO2

von der Assen, Bardow, Green Chem., 2014, 16, 3272

Niklas von der Assen

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Chemical conversion of CO2: Dream Production

Energy

CO2

Epoxide

Polyols

Langanke et al., Green Chem.,2014,16,1865–1870

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Chemical conversion of CO2: Dream Production

Energy

CO2

Epoxide

Polyols

Langanke et al., Green Chem.,2014,16,1865–1870

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• CO2 replaces part of epoxides• better catalysis & reaction engineering

allows to produce the desired product properties

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Dream Production: Life-cycle assessment

conventional polyol

kg CO2-eq /

(1.00 kg polyol +0.36 kWh electricity)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

CO2-based polyol

3.57

−0.47+0.08 3.03

Substitution ofraw materials

−0.15

CO2capture

3.5

Epoxides Epoxides

Epoxides


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Dream Production: Life-cycle assessment

conventional polyol

kg CO2-eq /

(1.00 kg polyol +0.36 kWh electricity)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

CO2-based polyol

3.57

−0.47+0.08 3.03

Substitution ofraw materials

−0.15

CO2capture

3.5

Epoxides Epoxides

Epoxides

1 kg CO2 as feedstock can save

3 kg of CO2 emissions


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Conclusions from CO2-based polymers

CO2 can substitute fossil resourcesand thereby reduce GHG emissions today

CO2 avoided can exceed the amount of CO2 utilized

more CO2-based polymers are becoming available(e.g. elastomers, see Meys, Kätelhön, Bardow, Green Chem., 2019, 21, 3334)

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Global polyurethane production

Status Quo:• polyurethane market:

33 Mt /year

• CO2e emissions: 164 Mt / year

R Geyer, JR Jambeck, KL Law. Production, use, and fate of all plastics ever made. Sci. Adv., 2017Zheng, Suh, "Strategies to reduce the global carbon footprint of plastics." Nature Climate Change (2019)

The potential for CO2–based polyurethanes:

• 20% CO2e reduction= 33 Mt CO2e/year

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Thermodynamics of CO2 conversion: 3. Inverting combustionEnergy

Chemicals (& fuels)

O = C = O

+ H2O

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CO2 Utilization in the Chemical Industry

What is the large-scale potential of CCU in the chemical industry ?

20 basic chemicals = 75% of CO2 emissions of chemical industry

ArneKätelhön

RaoulMeys

Sarah Deutz

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Methodology for determining CO2-Mitigation Potential

• Best Available Fossil Technologies• CO2-based production

(high- and low-TRL*) • Industrially validated database• 160 process with

engineering-level data

Mass & Energy Balances+ CO2 emissions

What is the large-scale potential of CCU in the chemical industry ?

20 basic chemicals = 75% of CO2 emissions of chemical industry

*TRL = Technology Readiness Level

Process Flowsheets

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Methodology for determining CO2-Mitigation Potential

Superstructure modelwith 160 processes

s.t. Demand for 20 basic chemicals in 2030Given carbon footprint of electricity

min Greenhouse Gas emissions

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Today: Fossil-based chemical industry

Kätelhön, Meys, Deutz, Suh, Bardow, PNAS, 2019https://doi.org/10.1073/pnas.1821029116

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CO2-based chemical industry

Kätelhön, Meys, Deutz, Suh, Bardow, PNAS, 2019

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• mass flows x 2.9• need for massive water supply

CO2-based chemical industry


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Life cycle: Fossil-based vs CO2-based chemical industry

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Life cycle: Fossil-based vs CO2-based chemical industry

• Chemically identical products identical use phase and end-of-life no benefit from temporary storage (!!!) benefit change in raw materials & production

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CO2-Mitigation Potential of CCU in the Chemical Industry

• CCU can lead to practically

carbon-neutral chemical industry

• GHG savings require

low-carbon electricity


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CO2-Mitigation Potential of CCU in the Chemical Industry

• CCU can lead to carbon-neutral

chemical industry

• GHG savings require


additional electricity


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Electricity need for CCU in the Chemical Industry

Cur

rent

glob

al e

lect

ricity

• GHG savings require a lot of



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Reactants

minerals

Chemicals & fuels

O = C = O

+ H2O

• CO2 utilization can provide many services • CO2 can reduce GHG emissions

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distinguish services offered by CCU


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The functional unit

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The functional unit – definition (ISO 14040)

“A system may have a number of possible functionsand the one(s) selected for a study depend(s) on the goal and scope of the LCA.

The functional unit defines the quantification of the identified functions (performance characteristics) of the product. The primary purpose of a functional unit is to provide a reference to which the inputs and outputs are related. This reference is necessary to ensure comparability of LCA results. Comparability of LCA results is particularly critical when different systems are being assessed, to ensure that such comparisons are made on a common basis.”

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Electricity need for CCU in the Chemical Industry

Cur

rent

glob

al e

lect

ricity




Goal & Scope:

use renewable energyto most reduce GHG emissions

Goal & Scope:

produce all chemicalswith minimal environmental impacts

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Power-to-CCU or Power-to-Something else? Renewable energies = limited resource

Sternberg, Bardow, Energy Environ. Sci., 2015, 8, 389

Which Power-to-X routeuses electricity best?

AndréSternberg

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P2X-EfficiencyWhich Power-to-X route uses electricity best?

P2X-Efficiency =

GHGP2X GHGfossil

GHGReduction = GHGfossil − GHGP2X

1 MWh

electricityConventional

processproductPower-to-X (P2X)process

Sternberg and Bardow, Energy Environ. Sci., 2015,8, 389-400.

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Power-to-Chemicals vs Power-to-X



• Declining efficiency

• Power-to-Chemicals often less efficient

than Power-to-Heatand Power-to-Mobility

• but there are high efficiency opportunities

Sternberg, Bardow, Energy Environ. Sci., 2015, 8, 389Kätelhön, Meys, Deutz, Suh, Bardow, PNAS, 2019

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Power-to-Chemicals vs Power-to-Cement



• Declining efficiency

• Power-to-Chemicals often less efficient

than Power-to-Heatand Power-to-Mobility

• but there are high efficiency opportunities

Sternberg, Bardow, Energy Environ. Sci., 2015, 8, 389


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• Power-to-Chemicals from CO2 and H2O

intrinsicallyless efficient

than Power-to-CCS

Power-to-Chemicals vs Power-to-CCS

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Cement sector• Giga-ton potential• Challenge:

The right productfor market uptake

Chemicals• High value opportunities

for economicsand the environment

• Large-scale chemicalsintrinsically inefficient

… BUT:

Steel sector

CO2‘s contribution to defossilization of the material world ?

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... is more than clean electricity

... is more than CO2-neutral

The vision: A sustainable world

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CO2-based fuels OME1: NOx & soot trade-off

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0

OME1: Diesel (vol. %) 0:100

Euro 6 NOx level

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0


Euro 6 NOx level

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0

OME1: Diesel (vol. %) 0:100 100:0

Euro 6 NOx level

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0

OME1: Diesel (vol. %) 0:100 35:65 100:0

Deutz, Bongartz, Heuser, Kätelhön, Schulze Langenhorst, Omari, Walters, Klankermayer, Leitner, Mitsos, Pischinger, Bardow, Energy Environ. Sci., 2018, 11, 331

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Sarah Deutz

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CO2-based fuels OME1: NOx & soot trade-off

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0


Euro 6 NOx level

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0


Euro 6 NOx level

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0

OME1: Diesel (vol. %) 0:100 100:0

Euro 6 NOx level

Filte

r Sm

oke

Num

ber /

-

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ind. spec. NOx / g/kWh0.0 0.2 0.4 0.6 0.8 1.0

OME1: Diesel (vol. %) 0:100 35:65 100:0

Chemically differing fuel overcomes NOx & soot trade-off

Deutz, Bongartz, Heuser, Kätelhön, Schulze Langenhorst, Omari, Walters, Klankermayer, Leitner, Mitsos, Pischinger, Bardow, Energy Environ. Sci., 2018, 11, 331

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Sarah Deutz

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The vision: A sustainable worldA sustainable world needs:1. clean electricity 2. a lot of clean electrictiy3. seriously, an awful lot of clean electricity

• Invest clean electricity where most efficient

• CO2 use is often not first choice to solve climate changebut CO2 provides a sustainable carbon feedstock with potential climate benefits:

Identify markets for products from CO2 mineralization Identify CO2-based chemicals with high benefits Exploit benefits of CO2-utilization beyond climate change Explore synergies with biomass & other carbon cycles

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distinguish services offered by CCU

evaluate CCU pathways based on the functional unit

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lecture 13: carbon capture and utilization...co2conversion: thermodynamics co2 + cxhyoz h2o gibbs...

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