Eggshell Catalyst For Waste Oil Biodiesel

ISEF Category: Chemistry

Subcategory: Environmental Chemistry  ·  Difficulty: Advanced  ·  Setup: University Lab  ·  Time: Full Year

The Hook

One kitchen waste stream can help turn another into fuel. Eggshells contain calcium carbonate, which can become calcium oxide, a strong catalyst for biodiesel making. That means the shells from breakfast could help convert used cooking oil into something with energy value. Your project can test whether that idea works well enough to matter.

What Is It?

This project asks whether eggshells can become a useful catalyst for making biodiesel from waste cooking oil. A catalyst is a material that helps a reaction happen faster or more cleanly without being used up. In this case, the eggshells are heated so the calcium carbonate changes into calcium oxide, or CaO, which can help break the oil molecules into biodiesel.

Think of the catalyst like a helper that opens a hard-to-move zipper. The oil molecules do not want to react easily on their own. The CaO gives the reaction a better path, so the oil can transform into methyl esters, the main chemical family in biodiesel. You can then check whether the fuel-like product looks different from the original oil by measuring viscosity, density, and infrared spectra, which show how chemical bonds changed.

The DFT part means density functional theory, a computer chemistry method that predicts how molecules vibrate and absorb infrared light. You can compare predicted FTIR peaks with the real spectrum from your product. That comparison helps you see whether your chemistry and your analysis agree.

Why This Is a Good Topic

This is a strong science fair topic because you can test a real environmental problem, waste oil disposal, while measuring clear chemical outcomes. You can change catalyst preparation, reaction conditions, or feedstock type, then compare product quality with simple physical measurements and spectra. The project can teach you catalysis, materials recycling, fuel properties, and data analysis all at once.

Research Questions

• How does the eggshell calcination method affect CaO catalyst activity in waste oil transesterification?
• What is the effect of catalyst loading on biodiesel viscosity and density?
• Does pre-treatment of waste cooking oil change biodiesel yield and purity?
• To what extent does the source of eggshells affect the FTIR profile of the final biodiesel?
• Which reaction condition gives the best match between measured FTIR peaks and predicted DFT spectra?
• How does repeated reuse of the eggshell-derived catalyst change product quality?

Basic Materials

• Clean eggshells.
• Hot plate or muffle furnace access for calcination.
• Waste cooking oil from a single source.
• Methanol or another approved alcohol for biodiesel synthesis.
• Base catalyst or eggshell-derived CaO, depending on your design.
• Glass beakers, flasks, and stirring rods.
• Digital balance with 0.01 g resolution.
• Graduated cylinders or volumetric glassware.
• Funnel and filter paper.
• Viscometer or a simple flow-time setup.
• Density meter, hydrometer, or pycnometer.
• FTIR access through a school or shared lab.
• Safety goggles, gloves, and lab coat.

Advanced Materials

• Analytical balance.
• Muffle furnace or controlled tube furnace.
• GC-MS access for product composition confirmation.
• FTIR spectrometer with ATR accessory.
• Viscometer with temperature control.
• Pycnometer or oscillating U-tube density meter.
• XRD access to verify CaO formation from eggshells.
• SEM-EDS access to examine catalyst surface and composition.
• Magnetic stirrer with heating control.
• Drying oven or vacuum oven.
• DFT-capable software access through a university cluster.
• Reference compounds for FTIR comparison, including fatty acid methyl esters.

Software & Tools

• Python: Organizes measurements, graphs trends, and runs basic statistical tests.
• Excel: Helps you build tables, calculate averages, and make clean plots.
• ImageJ: Measures peak heights or image-based assay data if you document reactions visually.
• Avogadro: Lets you build small molecules before running DFT calculations.
• ORCA: Runs quantum chemistry calculations for FTIR-related vibrational predictions.

Experiment Steps

1. Define the exact fuel property you want to improve, then pick one main variable to change first.
2. Choose a catalyst preparation route, and plan how you will confirm that eggshells really became CaO.
3. Set up comparison groups so you can separate catalyst effects from oil quality and mixing effects.
4. Build a measurement plan for viscosity, density, and FTIR so each result can be compared on the same basis.
5. Decide how you will translate DFT output into predicted infrared peaks that match your lab data.
6. Plan your statistics before you run the samples so you know how many repeats you need.

Common Pitfalls

• Using mixed waste oil from many sources, which changes the feedstock enough to hide the catalyst effect.
• Calcining eggshells without checking whether CaCO3 actually converted to CaO, which makes the catalyst identity uncertain.
• Measuring viscosity at different temperatures, which makes one sample look better only because it was warmer.
• Skipping a proper blank or control spectrum, which makes FTIR peak assignment shaky.
• Comparing DFT predictions directly to raw spectra without accounting for scaling and peak shifts, which leads to false matches.

What Makes This Competitive

A strong version of this project goes past a simple before-and-after demo. You can compare multiple catalyst preparations, test reuse, and pair real measurements with predicted spectra instead of stopping at one outcome. Better entries also control oil source, temperature history, and measurement conditions, then use statistics to show whether differences are real. That kind of careful design makes the project look like real chemical research.

Project Variations

• Test eggshell CaO against another low-cost waste-derived catalyst, such as seashell powder, to compare activity and fuel quality.
• Use different waste oils, such as fryer oil and restaurant oil, to see how feedstock changes biodiesel properties.
• Skip one analysis route and focus on a stronger materials question, such as how calcination temperature changes catalyst structure and reusability.

Learn More

• PubMed: Search for review articles on heterogeneous catalysts, biodiesel quality, and waste-derived CaO catalysts.
• NASA Technical Reports Server: Search for open reports on alternative fuels and combustion property testing.
• USGS Open-File Reports: Look for environmental studies on waste reuse, fuel additives, and life-cycle impacts.
• MIT OpenCourseWare, Chemistry and Chemical Engineering courses: Find free lectures on catalysis, kinetics, and spectroscopy.
• Royal Society of Chemistry journals: Search for open-access papers on biodiesel catalysis and FTIR characterization.