creating wealth from waste: high value materials and chemicals … · 2015. 11. 13. · creating...
TRANSCRIPT
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Creating Wealth from Waste:
High Value Materials and Chemicals from
Biowaste using Sustainable Technologies
Magdalena Titirici Queen Mary University of London
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Benefits of the Chemical Industry
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Chemical industry across the life cycle
Yet, we all hate chemicals !!!
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Move towards a circular economy
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We are running out of key elements
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Location of scarce elements
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So much ends up in waste
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What do we do with our waste?
What a waste!!
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• 90 Mt of food waste generated every
year in the EU (incl. industrial and
household waste)
• or 179kg per capita
• in the UK, over 90% of the 5.7 Mt of
commercial and industrial FW is
discarded to landfill
Food and agricultural waste is everywhere too
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Waste is tomorrows resource
We need to encourage the greater use of chemically rich waste as a resource
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Sugars
Phenols
Proteins
Starch
Natural Dyes
Chitosan
Cellulose
Pectin
Hemicellulose
Waxes Lignin
Chitin
Alginic Acid
Lipids
Tannin
What´s in biowaste?
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Palm oil waste
15.8 Mt/y Unripe coconut
husks 5 Mt/y
Cassava starch
228 Mt/y
30 Mt/y of
Agro-residues
382 t/y coffee
husks
1 Mt/y of
food waste Agro-residues
46 Mt/y
Spent coffee
grounds 3 Mt/y
Orange peels
12 Mt/y
FOOD WASTE IS EVERYWHERE
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Petroleum
feedstock
Fuels
Solvent
Bulk chemicals
Plastics
Fibres
Fine chemicals
Oils
Petroleum Refinery
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Solvent
Bulk chemicals
Plastics
Fibres
Fine chemicals
Oils
Biowaste
Biorefinery
Fuels
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Getting off fossil fuels
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Copyright David JC MacKay 2009. This electronic copy is provided, free, for personal use only. See www.withouthotair.com.
112 SustainableEnergy – without thehot air
big contribution from solar photovoltaics, we required half the areaPower per uni t l and
or wat er ar ea
Wind 2W/ m2
Offshore wind 3W/ m2
Tidal pools 3W/ m2
Tidal stream 6W/ m2
Solar PV panels 5–20W/ m2
Plants 0.5W/ m2
Rain-water
(highlands) 0.24W/ m2
Hydroelectricfacility 11W/ m2
Geothermal 0.017W/ m2
Table 18.10. Renewable facilities haveto be country-sized because allrenewables are so diffuse.
of Wales. To get a big contribution from waves, we imagined wavefarms covering 500km of coastline. To make energy crops with a big
contribution, we took 75% of the whole country.
Renewable facilities have to be country-sized because all renewables
are so diffuse. Table 18.10 summarizes most of the powers-per-unit-area that we encountered in Part I.
To sustain Britain’s lifestyle on its renewables alone would be very
difficult. A renewable-based energy solution will necessarily be largeand intrusive.
2. It’s not going to beeasy to make a plan that adds up using renewablesalone. If we are serious about getting off fossil fuels, Brits are goingto have to learn to start saying “yes” to something. Indeed to several
somethings.
In Part II I’ll ask, “assuming that we can’t get production from renew-ables to add up to our current consumption, what are the other options?”
Notes and further reading
page no.
104 UK average energy consumption is 125 kWh per day per person. I took this number from the UNDP Human Devel-
opment Report, 2007.
The DTI (now known as DBERR) publishes a Digest of United Kingdom Energy Statistics every year. [uzek2]. In
2006, according to DUKES, total primary energy demand was 244 million tons of oil equivalent, which corresponds to
130 kWh per day per person.
I don’t know the reason for the small difference between the UNDP number and the DUKES number, but I can explain
why I chose the slightly lower number. As I mentioned on p27, DUKES uses the same energy-summing convention
as me, declaring one kWh of chemical energy to be equal to one kWh of electricity. But there’s one minor exception:
DUKES defines the “primary energy” produced in nuclear power stations to be the thermal energy, which in 2006
was 9 kWh/ d/ p; this was converted (with 38% efficiency) to 3.4 kWh/ d/ p of supplied electricity; in my accounts,
I’ve focused on the electricity produced by hydroelectricity, other renewables, and nuclear power; this small switch in
convention reduces the nuclear contribution by about 5 kWh/ d/ p.
– Losses in the electricity transmission network chuck away 1% of total national energy consumption. To put it another
way, the losses are 8% of the electricity generated. This 8% loss can be broken down: roughly 1.5% is lost in the
long-distance high-voltage system, and 6% in the local public supply system. Source: MacLeay et al. (2007).
105 Figure 18.4. Data from UNDP Human Development Report, 2007. [3av4s9]
108 In the Middle Ages, the average person’s lifestyle consumed a power of 20 kWh per day. Source: Malanima (2006).
110 “I’mmore worried about the ugly powerlines coming ashore than I was about a Nazi invasion.” Source: [6f r j 55].
Switch to Renewable Energy
• Diffuse • Discontinuous
• Nuclear? • H2? • Fossil fuels with carbon capture and storage?
Energy Storage
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• 300 years ago humans used natural materials: stone, wood, bone, and natural fibbers
• Slowly our dependence changed and non-renewable displaced renewables
• By the end of 20 century we became 100% addicted to non-renewables
• The resources from which materials are made exist only in a few countries
17
Materials in Historical Perspective
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World Energy Consumption: 500 EJ/year
• Making materials & chemicals consumes about 35% of the global energy
• Materials & chemicals today are derived from fossil fuels
• Energy today is from fossil fuels
• To build renewable energy we need materials & chemicals
Materials & Chemicals
Energy
Conflict: Energy vs Materials
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Liquid: Chemicals
Solid: Carbon
Basic chemicals Liquid fuels Green Solvents Polymers
Functional materials Catalysts Electrode materials Adsorbents Solid fuels
HMF
LA
FA
HTC
Titirici et al, Chem. Soc. Rev., 2015, 44, 250-29 Titirici et al, Sustainable Carbon Materials via Hydrothermal processes, Wiley, 2013 Titirici et al, Energy and Environmental Science, 2012, 5, 6796
200-300 C self-generated pressure
• RENEWABLE • CHEAP • LOW ENERGY IMPUT • NO CO2 EMISSIONS
6
The Carbon Biorefinery Concept
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≈ 60-70% Solid Phase
≈ 30-40% Liquid Phase
≈ 5-10% Gas Phase
The Carbon Biorefinery Concept
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CARBON MATERIALS
Batteries
Water Splitting
H2 Storage
Fuel Cells
CO2 Capture
Suprercapacitors
Carbon Materials in Renewable Energy
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CARBON MATERIALS
Carbon Nanotubes
Carbon Onions
Fullerenes
Graphene
Carbide-derived Carbons
Reduced Graphene
Oxide
Classical Carbon Materials
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(-) Derived from fossil fuels (i.e. CNTs) (-) Unpredictable properties ( i.e. CNTs) (-) Difficulties in up-scale synthesis (i.e. single wall CNTs, graphene) (-) High energy-consuming or harsh techniques are required for their synthesis (i.e. high energy-CVD, laser-ablation for CNT; harsh: Hummer´s method-GO)
PROBLEMS
Classical Carbon Materials
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Carbon Materials from Waste
Titirici et al, Sustainable Carbon Materials via Hydrothermal processes, Wiley, 2013
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Titirici, Kubo, White et al, Chem. Mater. 2013, 25, 4781-4790 Titirici, Kubo, White et al, Chem. Mater. 2011, 23, 4882−4885 Titirici, Brun et al ChemSusChem, 2013, 6, 701 – 710 Titirici, White et al J. Mater. Chem., 2009, 19, 8645–8650
Carbon Nanostructures from Carbohydrates
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Morphology Control
Powders
Monoliths
Titirici, White, Clark et al, ChemSusChem, 2014, 7, 670-689
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Lignin-derived Carbon Fibres
ELECTROSPINNING
• When a sufficiently high voltage is applied to a liquid droplet, the body of the liquid becomes charged
• Electrostatic repulsion counteracts the surface tension and the droplet is stretched
• At a critical point a stream of liquid erupts from the surface and a charged liquid jet is formed
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Applications in Renewable Energy
Li-S Battery
CE
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Na Ion Batteries
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Na is equally distributed
E0 (Na+/Na) = -2.71V vs standard hydrogen electrode
Na vs Li
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• Stable at 1000 oC
• Uniform wall (ca. 20 nm)
• Turbostratic-type carbon
20 nm
20 nm
HTC Hollow Spheres
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(d)
1.39 V
0.36V
Cycle Voltammetry Rate Performance
Titirici, Tang, White et al, Adv. Energ. Mater. 2012 2, 873
Electrodes for Na-ion Batteries
Anodes in Na-Ion Batteries
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HTC in Fuel Cells
O2 + 4H+ + 4e- H2O
O2 + 4H+ + 2e- H2O2
H2O2 + 2H+ + 2e- 2H2O
ORR ORR at Cathode needs improvement
• Slow reaction kinetics
• Expensive Pt catalyst
• Poor catalyst stability
cathode
PEMFC
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Platinum Resources
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Platinum Resources
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Pt DEPLETION
Platinum Resources
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High Volume Food Waste
• Chitin ---- Nitrogen / Carbon source
• CaCO3 ---- Sacrificial template
HTC of Shrimp/Lobster Shell waste
Porous Carbons/Chiral Carbons
Using crustacean waste-”in situ” hard tempalting with CaCO3
Natural Templates
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Lobster-derived HTC
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1000 800 600 400 200 0
396 398 400 402 404
N-ON-Q
Inte
nsity (
a.u
.)
Binding Energy (eV)
N-6
C1s: 89.16 %
O1s: 4.73 %
N1s: 6.11 %
O1s N1s
C1s
Inte
nsity (
a.u
.)
Binding Energy (eV)
NITROGEN DOPED CARBONS
• 398.6 eV-pyridinic-N (N-6, 40.4%) • 400.9 eV-quaternary-N (N-Q; 53.7%) • 402.7 eV-pyridine-N-oxides (N-O; 5.9 %)
XPS
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-0.8 -0.6 -0.4 -0.2 0.0 0.2-5
-4
-3
-2
-1
0
Curr
ent
(mA
cm
-2)
Potential (V vs. Ag/AgCl)
N-CC
Pt/C
-0.2 0.0 0.2 0.4 0.6 0.8-4
-3
-2
-1
0
Curr
ent
(mA
cm
-2)
Potential (V vs. Ag/AgCl)
N-CC
Pt/C
RDE, LSV 1600 rmp
0.1 M KOH 0.5 M H2SO4
ORR Performance
0.2 V to -1 V 1 V to -0.2 V
scan rate of 10 mV s-1
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≈ 60-70%Solid Phase
≈ 30-40% Liquid Phase
≈ 5-10% Gas Phase
The Carbon Biorefinery Concept
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Chemicals from biomass
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0
10
20
30
40
50
60
70
80
2 4 6 24 2 4 6 24 2 4 6 24
Water 10% HCl 2% NaOH
5,82
14,51 17,33
21,37
27 27,49 24 24,88
1,03 1,62 1,71 2,04
Glucose@180°C
Solid Yield (%) LA Yield (%) HMF Yield (%)
Formic Yield (%) Acetic Acid (%) GVL (%)
0
10
20
30
40
2 4 6 24
% Y
ield
Hours
LA Yield from HTC Cellulose
Water
10% HCl
2% NaOH
0
5
10
15
20
25
30
35
Glucose Cellulose Rye Straw
30.3 27.2
14.7
LA from different precursor
6% H2SO4 24 hours
Acidic conditions lead to higher LA
Yield
NaOH slows down HTC process, leading to higher HMF yields
HTC Liquid Phase
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Levulinic Acid
• Similar properties to FAME • Addition to biodisel to improve the cold flow properties • Can be use in fragrance industries
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≈ 60-70%Solid Phase
≈ 30-40% Liquid Phase
≈ 5-10% Gas Phase
The Carbon Biorefinery Concept
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CO2 Utilization
CO2 to fuels
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CO2 Utilization
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• Use waste, stimulate a circular economy • Use green chemistry at every life cycle step • Green chemical industry and products