Optimization of photocatalytic production of hydrogen from hydrogen sulfide in alkaline solution using response surface methodology

Hydrogen gas production via glycerol steam reforming using nickel (Ni) loaded zeolite (HZSM-5) catalyst was focused on this research. 15 wt % Ni(HZSM-5) catalyst loading has been investigated based on the parameter of different range of catalyst weight (0.3-0.5g) and glycerol flow rate (0.2-0.4mL/min) at 600 ºC and atmospheric pressure. The products were analyzed by using gas-chromatography with thermal conductivity detector (GC-TCD), where it used to identify the yield of hydrogen. The data of the experiment were analyzed by using Response Surface Methodology (RSM) and Artificial Neural Network (ANN) in order to predict the production of hydrogen. The results show that the condition for maximum hydrogen yield was obtained at 0.4 ml/min of glycerol flow rate and 0.3 g of catalyst weight resulting in 88.35 % hydrogen yield. 100 % glycerol conversion was achieved at 0.4 of glycerol flow rates and 0.3 g catalyst weight. After predicting the model using RSM and ANN, both models provided good quality predictions. The ANN showed a clear superiority with R2 was almost to 1 compared to the RSM model.

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Application of Response Surface Methodology to Optimize the Process of Saponification Reaction from Coconut Oil in Ben Tre - Vietnam

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.279.235 ◽

2018 ◽

Vol 279 ◽

pp. 235-239 ◽

Cited By ~ 30

Author(s):

Nguyen Phu Thuong Nhan ◽

Tran Thien Hien ◽

Le Thi Hong Nhan ◽

Phan Nguyen Quynh Anh ◽

Le Tan Huy ◽

...

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Alkaline Solution ◽

Coconut Oil ◽

Solution Concentration ◽

Significant Error ◽

Solution Temperature ◽

Two Factors ◽

Good Repeatability ◽

Rsm Model

Response Surface Methodology (RSM) is used to optimize the conditions of the saponification reaction (Concentration of alkaline solution (%), temperature (°C) and reaction time (hour)). Level of foaming and durability of the emulsion (cleaning ability) from the product of the saponification reaction are two factors to evaluate the optimization process by RSM. After optimization, the alkaline solution concentration is 11%, the reaction was carried out for 2.5-3 hours at 85°C for the highest level of foaming and the most prolonged durability of the emulsion. This parameter was compared with the experiment, and the results showed that there was no significant error, this proves that the RSM model has good repeatability, can optimally correct and is essential in optimizing the survey parameters.

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ChemInform Abstract: Electrochemical Production of Hydrogen and Sulfur by Low-Temperature Decomposition of Hydrogen Sulfide in an Aqueous Alkaline Solution.

ChemInform ◽

10.1002/chin.199047013 ◽

1990 ◽

Vol 21 (47) ◽

Cited By ~ 1

Author(s):

A. A. ANANI ◽

Z. MAO ◽

R. E. WHITE ◽

S. SRINIVASAN ◽

A. J. APPLEBY

Keyword(s):

Hydrogen Sulfide ◽

Low Temperature ◽

Alkaline Solution ◽

Aqueous Alkaline Solution ◽

Temperature Decomposition ◽

Production Of Hydrogen ◽

Electrochemical Production

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Extraction Optimization of Astragaloside IV by Response Surface Methodology and Evaluation of Its Stability during Sterilization and Storage

Molecules ◽

10.3390/molecules26082400 ◽

2021 ◽

Vol 26 (8) ◽

pp. 2400

Author(s):

Lin Xu ◽

Kongjiong Wei ◽

Jiaolong Jiang ◽

Lianfu Zhang

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Alkaline Solution ◽

Retention Rate ◽

Traditional Approach ◽

Radix Astragali ◽

Astragaloside Iv ◽

Practical Applications ◽

Significant Difference ◽

The Stability

Radix Astragali is referred to as a variety of food-medicine herb, and it is commonly applied as Traditional Chinese Medicine (TCM). However, it is extremely difficult to extract its bio-active compounds (astragaloside IV) and apply it in food processing efficiently, which restricts its practical applications. In this study, the conditions required for the extraction of astragaloside IV were optimized by following the response surface methodology. More specifically, ammonia with a concentration of 24% was used as an extracting solvent, the solid–liquid ratio was 1:10 (w:v); the Radix Astragali was soaked at 25 °C for 120 min in advance and then stirred at 25 °C for 52 min (150 rpm) to extract astragaloside IV. This method promoted the transformation of other astragalosides into astragaloside IV and replaced the traditional approach for extraction, the solvent reflux extraction method. The yield of astragaloside IV reached the range of 2.621 ± 0.019 mg/g. In addition, the stability of astragaloside IV was evaluated by detecting its retention rate during sterilization and 60-day storage. As suggested by the results, the astragaloside IV in acidic, low-acidic, and neutral solutions was maintained above 90% after sterilization (95 °C and 60 min) but below 60% in an alkaline solution. High temperature and short-term sterilization approach is more appropriate for astragaloside IV in an alkaline solution. It was also found out that the astragaloside IV obtained using our method was maintained over 90% when stored at room temperature (25 °C), and there was no significant difference observed to low temperature (4 °C) in solutions regardless of acidity.

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Optimization of Hydrogen Yield from the Anaerobic Digestion of Crude Glycerol and Swine Manure

Catalysts ◽

10.3390/catal9040316 ◽

2019 ◽

Vol 9 (4) ◽

pp. 316

Author(s):

Aguilar-Aguilar F. A. ◽

Adriana Longoria ◽

Juantorena A. U. ◽

Santos A. S. ◽

Pantoja L. A. ◽

...

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Crude Glycerol ◽

Swine Manure ◽

Hydrogen Yield ◽

Fermentation Time ◽

Production Of Hydrogen ◽

Two Factors ◽

Carbon Nitrogen Ratio ◽

Nitrogen Ratio

Crude glycerol and swine manure are residues with exponential production in Mexico, nonetheless, they have the potential to generate hydrogen from the fermentation process. For this reason, this study has evaluated the optimization of hydrogen yield from crude glycerol and swine manure, using the response surface methodology. The response surface methodology helps in the compression of the mixture of crude glycerol/ swine manure, with the production of hydrogen as a result, which improves the yields of the process, reducing variability and time of development. A central composite design was employed with two factors, six axial points and four central points. The two factors evaluated were crude glycerol and swine manure concentrations, which were examined over a range of 4 to 10 g L−1 and 5 to 15 g L−1, respectively. This study demonstrated that the thermal pretreatment method is still the most suitable method to be applied, mainly in the preparation of hydrogen-producing inoculum. The maximum hydrogen yield was 142.46 mL per gram of volatile solid added. It used up 21.56% of the crude glycerol (2.75 g L−1) and 78.44% (10 g L−1) of the swine manure, maintaining a carbon/nitrogen ratio of 18.06, with a fermentation time of 21 days. The response surface methodology was employed to maximize the hydrogen production of crude glycerol/swine manure ratios by the optimization of factors with few assays and less operational cost.

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