• Title/Summary/Keyword: Formic acid production

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Effect of Ensiling with Acremonium Cellulase, Lactic Acid Bacterial and Formic Acid on Tissue Structure of Timothy and Alfalfa

  • Asian, Aniwaru;Okamoto, M.;Yoshihira, T.;Ataku, K.;Narasaki, N.
    • Asian-Australasian Journal of Animal Sciences
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    • v.10 no.6
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    • pp.593-598
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    • 1997
  • The changes of tissue structure in timothy and alfalfa during ensiling process with silage additives; lactic acid bacteria, cellulase and formic acid, were observed with a video microscope. Stem samples were obtained from the second internode, and cut to divide into 2 pieces. One piece was for observation of ensiled material and the other was for silage. The latter piece was put into a nylon cloth bag, and ensiled with grass for 50 days in a small experimental silo Lignification of the plant tissues was checked by acid phloroglucinol. Natural silage fermentation resulted in some degradation of less lignified parenchyma in both plant species. However, lignified sclerenchyma and vascular bundles remained intact. The cellulase enhanced the degradation of parenchyma tissue, while the formic acid suppressed the degradation. The effect of lactobacillus was small. The percentage of remained cross sectional area of stem and the loss of NDF and ADF by silage fermentation confirmed the observation. High negative correlations were obtained between the remained area and loss of fibrous components during silage fermentation in both plants, and between the loss of fibrous components and in vitro dry matter digestibility in timothy but not in alfalfa.

혐기소화조에서 메탄 발생에 영향을 미치는 인자 분석

  • Choe, Gwang-Geun;Mun, Sun-Sik;Lee, Sang-Hun;Kim, Sang-Yong;Lee, Jin-Won
    • 한국생물공학회:학술대회논문집
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    • 2001.11a
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    • pp.525-528
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    • 2001
  • The purpose of this study is to looking for the optimal condition of methane production enhancement. The conditions tested for increasing methane production were temperature. pH. and various carbon sources including methanol. formic acid. sodium acetate. succinic acid. and glucose. As a result, optimal temperature was 55 .C and optimal pH was around neutral condition. And methanol seemed to be best carbon source which can drastically increase methane production.

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Improvement of Ethanol Yield by Addition of Acetic Acid and Acetatdehyde in Ethanol Fermentation (에탄올 발효에서 초산 및 아세트알데히드 첨가에 의한 에탄올 수율의 증진)

  • 김진현;여주상유영제
    • KSBB Journal
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    • v.10 no.4
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    • pp.370-373
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    • 1995
  • The major by-products in ethanol fermentation by Saccharomyces cerevisiae were glycerol, acetaldehyde, acetic acid, lactic acid, and formic acid. The effects of these by-products on the cell growth and ethanol production were studied. By adding acetaldehyde or acetic acid in the fermentation broth, the cell growth decreased while the ethanol production increased. But glycerol and lactic acid had nearly no effects on the cell growth and the ethanol production. Acetic acid and acetaldehyde inhibited the cell growth by diminishing the growth rate as well as by prolonging the lag phase. The ethanol yield increased with the elevation of concentrations of acetic acid and acetaldehyde in the fermentation broth. The maximum ethanol yield was obtained for $3g/\ell$ acetic acid and $2g/\ell$ acetaldehyde, respectively.

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Electrochemical Reduction of Carbon Dioxide Using a Proton Exchange Membrane (양이온 교환막을 이용한 이산화탄소의 전기화학적 환원)

  • Kim, Hak-Yoon;Ahn, Sang Hyun;Hwang, Seung Jun;Yoo, Sung Jong;Han, Jonghee;Kim, Jihyun;Kim, Soo-Kil;Jang, Jong Hyun
    • Journal of the Korean Electrochemical Society
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    • v.15 no.4
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    • pp.216-221
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    • 2012
  • Electrochemical reduction of carbon dioxide has been widely studied by many scientists and researchers. Recently, the production of formic acid, which is expensive but highly useful liquid material, is receiving a great attention. However, difficulties in the electrochemical reduction process and analyzing methods impede the researches. Therefore, it is important to design an adequate system, develop the reduction process and establish the analyzing methods for carbon dioxide reduction to formic acid. In this study, the production of formic acid through electrochemical reduction of carbon dioxide was performed and concentration of the product has been analyzed. Large scale batch cell with proton exchange membrane was used in the experiment. The electrochemical experiment has been performed using a series of metal catalysts. Linear sweep voltammetry (LSV) and chronoamperometry were performed for carbon dioxide reduction and electrochemical analysis using silver chloride and platinum electrode as a reference electrode and counter electrode, respectively. The concentration of formic acid generated from the reduction was monitored using high performance liquid chromatography (HPLC). The results validate the appropriateness and effectiveness of the designed system and analyzing tool.

A Techno-Economic Study of Commercial Electrochemical CO2 Reduction into Diesel Fuel and Formic Acid

  • Mustafa, Azeem;Lougou, Bachirou Guene;Shuai, Yong;Razzaq, Samia;Wang, Zhijiang;Shagdar, Enkhbayar;Zhao, Jiupeng
    • Journal of Electrochemical Science and Technology
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    • v.13 no.1
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    • pp.148-158
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    • 2022
  • The electrochemical CO2 reduction (ECR) to produce value-added fuels and chemicals using clean energy sources (like solar and wind) is a promising technology to neutralize the carbon cycle and reproduce the fuels. Presently, the ECR has been the most attractive route to produce carbon-building blocks that have growing global production and high market demand. The electrochemical CO2 reduction could be extensively implemented if it produces valuable products at those costs which are financially competitive with the present market prices. Herein, the electrochemical conversion of CO2 obtained from flue gases of a power plant to produce diesel and formic acid using a consistent techno-economic approach is presented. The first scenario analyzed the production of diesel fuel which was formed through Fischer-Tropsch processing of CO (obtained through electroreduction of CO2) and hydrogen, while in the second scenario, direct electrochemical CO2 reduction to formic acid was considered. As per the base case assumptions extracted from the previous outstanding research studies, both processes weren't competitive with the existing fuel prices, indicating that high electrochemical (EC) cell capital cost was the main limiting component. The diesel fuel production was predicted as the best route for the cost-effective production of fuels under conceivable optimistic case assumptions, and the formic acid was found to be costly in terms of stored energy contents and has a facile production mechanism at those costs which are financially competitive with its bulk market price. In both processes, the liquid product cost was greatly affected by the parameters affecting the EC cell capital expenses, such as cost concerning the electrode area, faradaic efficiency, and current density.

Effects of Formic Acid on the Quality of Rye Silage at Different Dry Matter Levels (개미산의 첨가가 건물함량이 다른 호밀 사일리지의 품질에 미치는 영향)

  • 신정남;배동호
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.6 no.1
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    • pp.6-13
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    • 1986
  • Experiments were conducted to study the effects of formic acid on the quality of the rye silages at the different dry matter content (19.2, 28.6 and 32.2%) and different formic acid addition levels (0.00, 0.24, 0.48 and 0.71%). Rye were taken at vegetative stage (plant height 40cm) on November 29, 1984. Herbage were adjusted dry matter contents by wilting. Materials were ensiled in small polyethelene film bag after addition planned formic acid, and stored under room temperature. The results obtained are as follows: 1. In the visual observation of silage quality by addition of formic acid in unwilted silage show more clear brownish-yellow color and sweet flavor and less acidity compared with untreated formic acid. 2. The pH values of the silage increased by increasing DM content. At lower dry matter contents in materials the pH values decreased with increased formic acid levels. At higher dry matter content silage, however, non significant difference were observed. 3. The formation of total organic acid decreased by increasing DM content in the materials, and there appeared a significant difference (P<01) among formic acid levels. The organic acid contents in silage decreased with higher formic acid levels. 4. The water soluble carbohydrate in silage increased by increasing DM content. And it was also increased (P<01) with increased formic acid addition level. 5. The production of NH_3 - N decreased (P<01) with increasing the addition of formic acid, and decreased by increasing DM content in materials. 6. The in vitro dry matter digestibility of silages showed not difference among dry matter contents of the materials but at 0.71% addition of formic acid in unwilted silages appeared higher (P<05) digestibility compared the others (0.00% and 0.24%).

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Modulation of Phosphoenolpyruvate Metabolism of Anaerobiospirillum succiniciproducens ATCC 29305

  • Yoo, Jin Young;J. Gregory Zeikus
    • Journal of Microbiology and Biotechnology
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    • v.6 no.1
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    • pp.43-49
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    • 1996
  • Modulation of the catabolic PEP-pathway of Anaerobiospirillum succiniciproducens was tried using some enzymatic inhibitors such as gases and chemicals in order to enhance succinic acid production. 10$\%$ CO increased the succinic acid/acetic acid (S/A) ratio but inhibited growth as well as production of succinic and acetic acid. Hydrogen gas also increased the S/A ratio and inhibited the synthesis of pyruvate: ferredoxin oxidoreductase when used in mixture with $CO_2$, Catabolic repression by acetic, lactic and formic acid was not recognized and other modulators such as glyoxylate, pyruvate derivatives, arsenic salt, phosphate and sulfate were shown not to be effective. Magesium carbonate was shown effective for repressing acetate production. Palmitic acid, myristic acid and phenylalanine did not affect acetate production but carprylic acid completely inhibited growth.

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EFFECTS ON EATING AND RUMINATION BEHAVIOUR IN SHEEP OF FORMIC ACID AND FORMALDEHYDE TREATMENT AND METHIONINE-SUPPLEMENTATION TO LADINO CLOVER FIBROUS RESIDUE SILAGE

  • Fujihara, T.;Ichinohe, T.;Nakao, T.
    • Asian-Australasian Journal of Animal Sciences
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    • v.8 no.5
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    • pp.477-480
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    • 1995
  • The effects of formic acid and formaldehyde treatment and methionine supplementation to ladino clover fibrous residue silage on eating and rumination behaviour were studied in sheep. From the ladino clover fibrous residue, two silage were prepared, either untreated or treated with formic acid and formaldehyde. Four experimental diets: untreated silage, treated silage, untreated silage with supplementation of methionine and treated silage with supplementation of methionine, were offered to four sheep at a restricted level of DM intake (2% of BW/d) twice daily in a two-way layout design. Methionine supplementation with the treated silage significantly (p < 0.05) reduced daily time spent eating, and consequently, markedly increased rate of eating. However, there was little effect of methionine supplementation on the daily time spent eating and eating rate for sheep offered untreated silage. Methionine supplementation with the treated silage reduced daily time spent ruminating, although the same effect was not observed for untreated silage. The rumination index (time spent ruminating/100 g DM eaten) was remarkably smaller (p < 0.05) with methionine supplement in feeding treated silage, although it did not differ for sheep offered untreated silage. There were no clear effect of methionine supplementation on the rumination efficiency (i.e. number of chews/bolus, bolus time and rumination chewing rate) both feeding untreated silage and treated silage.

Competitiveness of Formic Acid Fuel Cells: In Comparison with Methanol (포름산 연료전지의 경쟁력)

  • Uhm, Sunghyun;Seo, Minhye;Lee, Jaeyoung
    • Applied Chemistry for Engineering
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    • v.27 no.2
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    • pp.123-127
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    • 2016
  • Methanol fuel cells having advantages of relatively favorable reaction kinetics and higher energy density have attracted increasing interests as best alternative to hydrogen fuel cell because of H2 production, storage and distribution issues. While there have been extensive research works on developing key components such as electrocatalysts as well as their physicochemical properties in practical formic acid fuel cells, there have also been urgent requests for investigating which fuel sources will be more suitable for direct liquid fuel cells in future. In this mini-review, we highlight the overall interest and outlook of formic acid fuel cells in terms of electrocatalysts, fuel supply and crossover, water management, fuel cell efficiency and system integration in comparison with methanol fuel cells.