Hydrolysis of macroalgae using heterogeneous catalyst for bioethanol production
Inn Shi Tan1, Man Kee Lam, Keat Teong Lee
1School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
Carbohydrate Polymers
|April 3, 2013
Summary
Macroalgae biomass, like Eucheuma cottonii, can be converted to bioethanol using Amberlyst-15 catalyzed hydrolysis. This process achieved a 39.7% sugar yield and 65% bioethanol fermentation efficiency.
Area of Science:
- Biotechnology
- Renewable Energy
- Biomass Conversion
Background:
- Macroalgae biomass presents a sustainable alternative to lignocellulosic materials for bioethanol production.
- Efficient hydrolysis of algal carbohydrates is crucial for subsequent fermentation.
Purpose of the Study:
- To investigate the use of Amberlyst-15 as a heterogeneous catalyst for hydrolyzing Eucheuma cottonii biomass.
- To optimize hydrolysis conditions for maximizing reducing sugar yield.
- To evaluate the subsequent bioethanol fermentation of the hydrolysate.
Main Methods:
- Hydrolysis of Eucheuma cottonii using Amberlyst-15 catalyst.
- Optimization of reaction parameters: catalyst loading, temperature, time, and biomass loading.
- Fermentation of the resulting sugar hydrolysate using Saccharomyces cerevisiae.
Main Results:
- Optimal hydrolysis conditions yielded 39.7% sugar yield at 120°C, 4% catalyst loading, 12.5% biomass loading, and 1.5h reaction time.
- Fermentation with Saccharomyces cerevisiae produced a bioethanol yield of 0.33 g/g with 65% efficiency.
- Amberlyst-15 demonstrated effectiveness in macroalgae carbohydrate hydrolysis.
Conclusions:
- Heterogeneous-catalyzed hydrolysis of macroalgae biomass using Amberlyst-15 is a viable pretreatment step for bioethanol production.
- The combined hydrolysis and fermentation strategy offers a feasible route for sustainable bioethanol generation from Eucheuma cottonii.
- Further research can explore scaling up this process for industrial applications.
More Related Videos
Related Concept Videos
01:25Biofuels
The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
01:21Green Algae
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
01:26Microbial Bioremediation of Hydrocarbons
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to physical or...
01:25Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...