A Study on Catalytic Hydrolysis of Corncob by Formic Acid

2012 ◽  
Vol 560-561 ◽  
pp. 321-324
Author(s):  
Jing Wen Xue ◽  
Zhe Wang
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Formic Acid ◽  
Degradation Products ◽  
Chemical Compositions ◽  
Catalytic Hydrolysis ◽  
Higher Temperature ◽  
Hydrolysis Residue ◽  
Hydrolysis Of

Corncob powder was hydrolyzed with formic acid under the catalyzation of hydrochloric acid. Sugar contents in hydrolysis liquor at different reaction time and temperature were determined. The chemical compositions in hydrolysis residue were also analyzed. Results showed that the formic acid could hydrolyze the polysaccharides in corncob and the degradation products were dissolved in hydrolysis liquor. The addition of catalytic hydrochloric acid accelerated the hydrolysis of polyose. The proper hydrolysis condition was 80°C for 3h. Lignin might undergo hydrolysis at higher temperature.

Hydrolysis of Bamboo Fiber for Production of Fermentable Sugars in Saturated Formic Acid

2012 ◽  
Vol 535-537 ◽  
pp. 2442-2445 ◽  
Author(s):  
Jun Ping Zhuang ◽  
Xue Ping Li
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Formic Acid ◽  
Bamboo Fiber ◽  
Fermentable Sugars ◽  
Solution Temperature ◽  
Hydrochloric Acid Concentration ◽  
Formic Acid Solution ◽  
Hydrolysis Of

Bamboo is thought as an alternative feedstock for the production of fine chemicals, such as fuel ethanol and lactic acid to reduce our reliance on fossil fuels. Pretreatment is an essential step in the enzymatic hydrolysis of biomass for bioethanol production. In this study, hydrolysis of bamboo fiber for fermentable sugars production in hydrochloric acid used as a catalyst in saturated formic acid solution were studied. The purpose of this study is to investigate the effects of the hydrochloric acid concentration, temperature, the ratio of solid to liquid and reaction time on the fermentable sugars production. The optimum conditions were: adding 4% hydrochloric acid in saturated formic acid solution, temperature of 65 °C, 4% of the ratio of solid to solvent, with a reaction time of 90 min, under these conditions, the hydrolysate contained 23.52% glucose and 28.51% reducing sugars.

scholarly journals Catalytic hydrolysis of Dichlorodifluoromethane over MoO3/ZrO2 -TiO2 solid acid

2020 ◽  
Author(s):  
Zhiqian Li ◽  
Tong Zhou ◽  
Guoqing Ren ◽  
Xiaofang Tan ◽  
Lijuan Jia ◽  
...  
Keyword(s):  
Water Vapor ◽  
Degradation Rate ◽  
Solid Acid ◽  
Degradation Products ◽  
Vapor Concentration ◽  
Water Vapor Concentration ◽  
Catalytic Hydrolysis ◽  
Hydrolysis Temperature ◽  
Continuous Reaction ◽  
Hydrolysis Of

Abstract The catalytic behaviors of solid acid of MoO3/ZrO2-TiO2 calcined at different temperature for the catalytic hydrolysis of Dichlorodifluoromethane have been studided. The effects of catalytic hydrolysis temperature and water vapor concentration on catalytic hydrolysis of Dichloro difluoromethane were also studied. The Results show 98.65 % of Dichlorodifluoromethane is degraded over MoO3/ZrO2-TiO2 catalyst calcined at 500 ℃ with a concentration of water vapor of 83.18% when the hydrolysis temperature is 350 ℃ and the Dichlorodifluoromethane flux rate is 1 mL/min with main degradation products were CO, CO2, HF and HCl. A maintained degradation rate of 65.34% of Difluoromethylene Chloride has been observed through 30 hours’ continuous reaction over the catalyst of MoO3/ZrO2-TiO2. The XRD result reveals the main phase of solid MoO3/ZrO2-TiO2 catalyst is the tetragonal Zr (MoO4)2 that dopedTiO2 of anatase.

Production of Fermentable Sugars from Wheat Straw by Formic Acid Pretreatment

2012 ◽  
Vol 550-553 ◽  
pp. 1258-1261 ◽  
Author(s):  
Jun Ping Zhuang ◽  
Xue Ping Li ◽  
Ying Liu
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Formic Acid ◽  
Fossil Fuels ◽  
Structural Characteristics ◽  
Fermentable Sugars ◽  
Solution Temperature ◽  
Hydrochloric Acid Concentration ◽  
Acid Pretreatment ◽  
Hydrolysis Of Cellulose

Emerging biorefinery technologies offer a sustainable alternative through the utilisation of carbohydrates to reduce our reliance on fossil fuels. Cellulose molecules consist of long chains of glucose molecules as do starch molecules, but have a differentstructural configuration. These structural characteristics plus the encapsulation by lignin makes cellulosic materials more difficult to hydrolyze than starchy materials. In recent years, treatment of lignocellulosic biomass with dilute acid has been primarily used as a means of hemicellulose hydrolysis and pretreatment for enzymatic hydrolysis of cellulose and a significant advancement has also been found by adding hydrochloric acid with catalyst dosage in saturated formic acid. In the present work, the hydrochloric acid concentration, temperature, the ratio of solid to liquid and reaction time were prepared for the fermentable sugars production. The obtained optimum conditions were: adding 4% hydrochloric acid in saturated formic acid solution, temperature of 105 °C, with a reaction time of 90 min, and the maximum glucose and reducing sugars production were 26.84 g/L% and 27.4%, respectively.

Catalytic Effects of Super Acid SO42-/γ-Al2O3 to PET Depolymerization under Microwave Irradiation

2012 ◽  
Vol 550-553 ◽  
pp. 280-283 ◽  
Author(s):  
Hong Mei Yan ◽  
Yong Shuai Ma ◽  
Wei Lu Zhang ◽  
Dong Zhang
Keyword(s):  
Reaction Time ◽  
Microwave Irradiation ◽  
Polyethylene Terephthalate ◽  
Catalytic Hydrolysis ◽  
Whole Process ◽  
Morphology Analysis ◽  
Different Temperatures ◽  
Super Acid ◽  
Catalytic Effects ◽  
Hydrolysis Of

The effects of different temperatures on catalytic hydrolysis of polyethylene terephthalate(PET) by solid super acids SO42-/γ-Al2O3as a catalyst under microwave irradiation were studied, and in the meantime, the morphology analysis of the undepolymerized PET under the same temperature was investigated by SEM. The results indicate that the depolymerization rate of PET is seriously influenced by reaction time and temperature. The depolymerization mechanism is changed by the solid super acid SO42-/γ-Al2O3, and the depolymerization rate is higher than that of with no catalyst in the whole process of reaction.

scholarly journals Catalytic hydrolysis of Dichlorodifluoromethane over MoO3/ZrO2 -TiO2 solid acid

2019 ◽  
Author(s):  
Zhiqian Li ◽  
Tong Zhou ◽  
Guoqing Ren ◽  
Xiaofang Tan ◽  
Lijuan Jia ◽  
...  
Keyword(s):  
Water Vapor ◽  
Degradation Rate ◽  
Solid Acid ◽  
Degradation Products ◽  
Vapor Concentration ◽  
Catalytic Hydrolysis ◽  
Tio2 Catalyst ◽  
Hydrolysis Temperature ◽  
Continuous Reaction ◽  
Hydrolysis Of

Abstract The catalytic behaviors of solid acid of MoO3/ZrO2-TiO2 calcined at different temperature for the catalytic hydrolysis of Dichlorodifluoromethane have been studided. The effects of catalytic hydrolysis temperature and water vapor concentration on catalytic hydrolysis of Dichlorodifluoromethane were also studied. The Results show 98.65 % of Dichlorodifluoromethane is degraded over MoO3/ZrO2-TiO2 catalyst calcined at 500 ℃ with a concentration of water vapor of 83.18% when the hydrolysis temperature is 400。C and the Dichlorodifluoromethane flux rate is 1mL/min with main degradation products were CO, CO2, HF and HCl. A maintained degradation rate of 65.34 % of Difluoromethylene Chloride has been observed through 30 hours’ continuous reaction over the catalyst of MoO3/ZrO2-TiO2. The XRD result reveals the main phase of solid MoO3/ZrO2-TiO2 catalyst is the tetragonal Zr(MoO4)2 that doped TiO2 of anatase.

Study on the Synthesis of Ethylene Glycol by Catalytic Hydrolyze of Ethylene Carbonate

2014 ◽  
Vol 989-994 ◽  
pp. 79-82
Author(s):  
Min Zhang
Keyword(s):  
Reaction Time ◽  
Ethylene Glycol ◽  
Influencing Factors ◽  
Reaction Temperature ◽  
Mass Fraction ◽  
Ethylene Carbonate ◽  
Catalytic Hydrolysis ◽  
Optimal Conditions ◽  
Reaction Products ◽  
Hydrolysis Of

The process for ethylene glycol (EG) by catalytic hydrolysis of ethylene carbonate (EC) was studied. The influencing factors of the reaction products were studied which include the reaction temperature, the mole ratio of H2O to EC, the mass fraction of the catalyst and the reaction time. The optimal conditions were identified as follows: the reaction temperature is 140-145°C, n (H2O) :n (EC) = 2.0-2.5 : 1, the catalyst of Al2O3is about 2.0wt%, the reaction time is about two hours. Under the above conditions, EC can be completely hydrolyzed and the selectivity of EG is above 98%.

scholarly journals Lattice disorder effect on magnetic ordering of iron arsenides

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Athena S. Sefat ◽  
Xiaoping P. Wang ◽  
Yaohua Liu ◽  
Qiang Zou ◽  
Mimgming Fu ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Magnetic Ordering ◽  
Structural Features ◽  
Lattice Parameter ◽  
Chemical Compositions ◽  
Lattice Disorder ◽  
Local Lattice ◽  
Higher Temperature ◽  
Disordered Crystal ◽  
Planar Strain

AbstractThis study investigates magnetic ordering temperature in nano- and mesoscale structural features in an iron arsenide. Although magnetic ground states in quantum materials can be theoretically predicted from known crystal structures and chemical compositions, the ordering temperature is harder to pinpoint due to potential local lattice variations that calculations may not account for. In this work we find surprisingly that a locally disordered material can exhibit a significantly larger Néel temperature (TN) than an ordered material of precisely the same chemical stoichiometry. Here, a EuFe2As2 crystal, which is a ‘122’ parent of iron arsenide superconductors, is found through synthesis to have ordering below TN = 195 K (for the locally disordered crystal) or TN = 175 K (for the ordered crystal). In the higher TN crystals, there are shorter planar Fe-Fe bonds [2.7692(2) Å vs. 2.7745(3) Å], a randomized in-plane defect structure, and diffuse scattering along the [00 L] crystallographic direction that manifests as a rather broad specific heat peak. For the lower TN crystals, the a-lattice parameter is larger and the in-plane microscopic structure shows defect ordering along the antiphase boundaries, giving a larger TN and a higher superconducting temperature (Tc) upon the application of pressure. First-principles calculations find a strong interaction between c-axis strain and interlayer magnetic coupling, but little impact of planar strain on the magnetic order. Neutron single-crystal diffraction shows that the low-temperature magnetic phase transition due to localized Eu moments is not lattice or disorder sensitive, unlike the higher-temperature Fe sublattice ordering. This study demonstrates a higher magnetic ordering point arising from local disorder in 122.

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