Characterization of ZSM-5 during Conversion of Glucose to Levulinic Acid

2012 ◽  
Vol 260-261 ◽  
pp. 1206-1209
Author(s):  
Ying Liu ◽  
Lu Lin ◽  
Xiao Yu Sui ◽  
Jun Ping Zhuang ◽  
Chun Sheng Pang
Keyword(s):  
Catalytic Activity ◽  
Levulinic Acid ◽  
Characteristic Peak ◽  
Relative Crystallinity ◽  
Al Content ◽  
Hydroxymethyl Furfural ◽  
Good Catalytic Activity ◽  
Acid Catalyzed ◽  
Hydrolysis Of

The effects of catalyst amount on the yields of levulinic and hydroxymethyl furfural were investigated during conversion of glucose to levulinic acid catalyzed by ZSM-5. XRD and XPS were used to analyse the characteristics of ZSM-5 before reaction and after reaction. The results showed that: ZSM-5 exhibited good catalytic activity in the reaction of hydrolysis of glucose to produce levulinic acid. The characteristic peak of ZSM-5 molecular sieve did not change after reaction compared to that of before reaction. The relative crystallinity of ZSM-5 decreased after reaction, which caused the catalytic activity decline. The surface O, Si and Al content of ZSM-5 decreased greatly. The increase of element C was the main reason of inactivation of catalyst.

Characteristics of Solid Super Acid SO42-/TiO2-Al2O3-SnO2 during Conversion of Glucose to Levulinic Acid

2012 ◽  
Vol 550-553 ◽  
pp. 103-106
Author(s):  
Ying Liu ◽  
Lu Lin ◽  
Xiao Yu Sui ◽  
Jun Ping Zhuang ◽  
Chun Sheng Pang
Keyword(s):  
Binding Energy ◽  
Levulinic Acid ◽  
Diffraction Peak ◽  
Catalyst Amount ◽  
Hydroxymethyl Furfural ◽  
Good Catalytic Activity ◽  
Super Acid ◽  
Diffraction Peaks ◽  
Acid Catalyzed ◽  
Hydrolysis Of

The effects of catalyst amount on the yields of levulinic and hydroxymethyl furfural were investigated during conversion of glucose to levulinic acid catalyzed by solid super acid SO42- / TiO2-Al2O3-SnO2. XRD and XPS were used to analyse the characteristics of solid super acid SO42- / TiO2-Al2O3-SnO2 before reaction and after reaction. The results showed that: solid super acid SO42- / TiO2-Al2O3-SnO2exhibited good catalytic activity in the reaction of hydrolysis of glucose to produce levulinic acid. There were three obvious peaks in these XRD spectra. The peaks on 44.6° and 67.1° were the characteristic diffraction peaks of γ-Al2O3. The anatase characteristic diffraction peak was on 37.4°. The catalyst was steady in the process. The binding energy of S 2p was similar to the binding energy of standard S6+ 2p in the S 2p XPS spectrum of solid super acid. O 1s XPS was double-peaked spectrum. The increase of element C was the main reason of inactivation of catalyst.

Conversion of Glucose to Levulinic Acid Catalyzed by ZSM-5 Loading SO42-/ ZrO2

2013 ◽  
Vol 291-294 ◽  
pp. 249-252
Author(s):  
Ying Liu ◽  
Lu Lin ◽  
Xiao Yu Sui ◽  
Jun Ping Zhuang ◽  
Chun Sheng Pang
Keyword(s):  
Reaction Time ◽  
Reaction Temperature ◽  
Levulinic Acid ◽  
Temperature Reaction ◽  
Catalyst Amount ◽  
Hydroxymethyl Furfural ◽  
Ft Ir ◽  
Acid Catalyzed ◽  
Molar Percent ◽  
Hydrolysis Of

Hydrolysis of glucose to produce levulinic acid catalyzed by ZSM-5 loading SO42-/ ZrO2 was studied in this paper. The effects of different factors such as catalyst amount, reaction temperature, reaction time on the yields of levulinic acid and hydroxymethyl furfural were investigated. It was found that the highest yield of levulinic acid was 55.03% (molar percent) under the conditions of catalyst amount 3 g, reaction temperature 180 °C and reaction time 2.5 h. Surface structure of catalyst was analyzed by FT-IR, indicating that crystallinity of catalyst was 0.66.

scholarly journals Identification of three critical acidic residues of poly(ADP-ribose) glycohydrolase involved in catalysis: determining the PARG catalytic domain

2005 ◽  
Vol 388 (2) ◽  
pp. 493-500 ◽  
Author(s):  
Chandra N. PATEL ◽  
David W. KOH ◽  
Myron K. JACOBSON ◽  
Marcos A. OLIVEIRA
Keyword(s):  
Catalytic Activity ◽  
Catalytic Domain ◽  
Functional Characterization ◽  
Sequence Alignments ◽  
Inhibitor Binding ◽  
Conserved Sequence ◽  
Binding Residue ◽  
Acidic Residues ◽  
Hydrolysis Of

PARG [poly(ADP-ribose) glycohydrolase] catalyses the hydrolysis of α(1″→2′) or α(1‴→2″) O-glycosidic linkages of ADP-ribose polymers to produce free ADP-ribose. We investigated possible mechanistic similarities between PARG and glycosidases, which also cleave O-glycosidic linkages. Glycosidases typically utilize two acidic residues for catalysis, thus we targeted acidic residues within a conserved region of bovine PARG that has been shown to contain an inhibitor-binding site. The targeted glutamate and aspartate residues were changed to asparagine in order to minimize structural alterations. Mutants were purified and assayed for catalytic activity, as well as binding, to an immobilized PARG inhibitor to determine ability to recognize substrate. Our investigation revealed residues essential for PARG catalytic activity. Two adjacent glutamic acid residues are found in the conserved sequence Gln755-Glu-Glu757, and a third residue found in the conserved sequence Val737-Asp-Phe-Ala-Asn741. Our functional characterization of PARG residues, along with recent identification of an inhibitor-binding residue Tyr796 and a glycine-rich region Gly745-Gly-Gly747 important for PARG function, allowed us to define a PARG ‘signature sequence’ [vDFA-X3-GGg-X6–8-vQEEIRF-X3-PE-X14-E-X12-YTGYa], which we used to identify putative PARG sequences across a range of organisms. Sequence alignments, along with our mapping of PARG functional residues, suggest the presence of a conserved catalytic domain of approx. 185 residues which spans residues 610–795 in bovine PARG.

Preparation and characterization of carbon-encapsulated iron nanoparticles and their catalytic activity in the hydrogenation of levulinic acid

2014 ◽  
Vol 50 (1) ◽  
pp. 334-343 ◽  
Author(s):  
Ja Young Park ◽  
Mi Ae Kim ◽  
Seung Jae Lee ◽  
Jongjin Jung ◽  
Hye Mi Jang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Levulinic Acid ◽  
Iron Nanoparticles

scholarly journals The effect of pretreatment on methanesulfonic acid-catalyzed hydrolysis of bagasse to levulinic acid, formic acid, and furfural

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74525-74535 ◽  
Author(s):  
Darryn W. Rackemann ◽  
John P. Bartley ◽  
Mark D. Harrison ◽  
William O. S. Doherty
Keyword(s):  
Formic Acid ◽  
Levulinic Acid ◽  
Methanesulfonic Acid ◽  
Acid Catalyzed ◽  
Hydrolysis Of

scholarly journals Low temperature catalytic hydrolysis of carbon disulfide over nano-active carbon based catalysts prepared by liquid phase deposition

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40354-40361 ◽  
Author(s):  
Kai Li ◽  
Xin Song ◽  
Guijian Zhang ◽  
Chi Wang ◽  
Ping Ning ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Liquid Phase ◽  
Low Temperature ◽  
Carbon Disulfide ◽  
Metal Species ◽  
Catalytic Hydrolysis ◽  
Liquid Phase Deposition ◽  
Solution Ph ◽  
Good Catalytic Activity ◽  
Hydrolysis Of

Fe/nano-AC has good catalytic activity for CS2 hydrolysis. The activity of the catalyst was affected by the amount of pores (5–10 nm). Metal species affected the oxidation of H2S. The solution pH and fluoride affected the generation of Fe3+.

Monodisperse platinum nanoparticles supported on highly ordered mesoporous silicon nitride nanoblocks: superior catalytic activity for hydrogen generation from sodium borohydride

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58943-58951 ◽  
Author(s):  
Chrystelle Salameh ◽  
Alina Bruma ◽  
Sylvie Malo ◽  
Umit B. Demirci ◽  
Philippe Miele ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Silicon Nitride ◽  
Sodium Borohydride ◽  
Platinum Nanoparticles ◽  
Hydrogen Generation ◽  
Synthesis And Characterization ◽  
Mesoporous Silicon ◽  
Ordered Mesoporous ◽  
Hydrolysis Of

Synthesis and characterization of ordered mesoporous silicon nitride nanoblocks as efficient supports of platinum nanoparticles for the hydrolysis of sodium borohydride.

scholarly journals Acid-Catalyzed Conversion of Cellulose Into Levulinic Acid With Biphasic Solvent System

2021 ◽  
Vol 12 ◽  
Author(s):  
Changyue Ma ◽  
Bo Cai ◽  
Le Zhang ◽  
Junfeng Feng ◽  
Hui Pan
Keyword(s):  
Levulinic Acid ◽  
Value Added ◽  
Acid Catalyst ◽  
Solvent System ◽  
High Yield ◽  
Catalyst Loading ◽  
Amberlyst 15 ◽  
Hydrolysis Of Cellulose ◽  
Acid Catalyzed ◽  
Hydrolysis Of

In this work, acid-catalyzed conversion of cellulose into levulinic acid in a biphasic solvent system was developed. Compared to a series of catalysts investigated in this study, the Amberlyst-15 as a more efficient acid catalyst was used in the hydrolysis of cellulose and further dehydration of derived intermediates into levulinic acid. Besides, the mechanism of biphasic solvent system in the conversion of cellulose was studied in detail, and the results showed biphasic solvent system can promote the conversion of cellulose and suppress the polymerization of the by-products (such as lactic acid).The reaction conditions, such as temperature, time, and catalyst loading were changed to investigate the effect on the yield of levulinic acid. The results indicated that an appealing LA yield of 59.24% was achieved at 200°C and 180 min with a 2:1 ratio of Amberlyst-15 catalyst and cellulose in GVL/H2O under N2 pressure. The influence of different amounts of NaCl addition to this reaction was also investigated. This study provides an economical and environmental-friendly method for the acid-catalyzed conversion of cellulose and high yield of the value-added chemical.

Sign in / Sign up

Export Citation Format

Share Document