FTIR and31P-NMR Spectroscopic Analyses of Surface Species in Phosphate-Catalyzed Lactic Acid Conversion

Gunter, Garry C.; Crăciun, Radu; Tam, Man S.; Jackson, James E.; Miller, Dennis J.

doi:10.1006/jcat.1996.0376

Cited by 55 publications

(46 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lactic acid has been known as one of the most reactive species because it has both hydroxyl and carboxy functional groups. It can be converted into a variety of chemicals through polymerization [4], condensation [5][6][7], dehydration [8], esterification [9,10], and oxidation [11].…”

Section: Introductionmentioning

confidence: 99%

Catalytic conversion of lactic acid into propylene glycol over various metals supported on silica

et al. 2011

View full text Add to dashboard Cite

Catalytic hydrogenation of lactic acid to propylene glycol was performed over various metals (Ag, Co, Cu, Ni, Pt, and Ru) supported on silica prepared by an incipient wetness impregnation method. The loading amount of each metal was 5 wt%. Crystallinity of the synthesized catalysts was investigated by X-ray diffraction (XRD), and the BET method was utilized to examine the surface area. Pore volume and pore size of catalysts were determined using BJH analysis of the N 2 adsorption isotherm. Particle sizes of various metals were determined from transmission electron microscopy (TEM) images. The catalytic activity was found to be strongly dependent on the supported metal. Among catalysts tested, Ru/SiO 2 showed the highest propylene glycol yield. The yield of propylene glycol increased with pressure, and the highest yield was achieved at 130°C.

show abstract

Section: Introductionmentioning

confidence: 99%

Catalytic conversion of lactic acid into propylene glycol over various metals supported on silica

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Q 2 describes an internal phosphate tetrahedral bond, including linear polyphosphate chains (�20 ppm) and a metaphosphate-ringed structure (�22 ppm). 44,45 The calculated average chain length (N ˜) was approximately 40. The morphology of CPP (Figure 3 As shown in the FTIR spectra in Figure 5, the absorption peaks at 3421 cm �1 and 2943 cm �1 were attributed to the vibrations of -OH and C-H, respectively.…”

Section: Component and Morphology Characterizationmentioning

confidence: 98%

A novel degradable tricalcium silicate/calcium polyphosphate/polyvinyl alcohol organic-inorganic composite cement for bone filling

Zhang

Chen

et al. 2021

J Biomater Appl

View full text Add to dashboard Cite

In this study, tricalcium silicate (C3S) calcium/polyphosphate/polyvinyl alcohol organic-inorganic self-setting composites were successfully designed. A variety of tests were conducted to characterize their self-setting properties, mechanical properties, degradation properties, and related biological properties. The composite bone cements showed a short setting time (5.5–37.5 min) with a 5:5–6:4 ratio of C3S/CPP to maintain a stable compressive strength (28 MPa). In addition, PVA effectively reduced the brittleness of the inorganic phase. Degradation experiments confirmed the sustainable surface degradation of bone cement. A maximum degradation rate of 49% was reached within 56 days, and the structure remained intact without collapse. Culturing MC3T3 cells with bone cement extracts revealed that the composite bone cements had excellent biological properties in vitro. The original extract showed a proliferation promotion effect on cells, whereas most of the other original extracts of degradable bone cements were toxic to the cells. Meanwhile, extracellular matrix mineralization and alkaline phosphatase expression showed remarkable effects on cell differentiation. In addition, a good level of adhesion of cells to the surfaces of materials was observed. Taken together, these results indicate that C3S/CPP/PVA composite bone cements have great potential in bone defect filling for fast curing.

show abstract

“…However, in the spectrum of purified glycerin, there was a band at the height of 491 cm −1 , which was not present in the spectrum of crude glycerin. This band can be attributed to deformation since in the purification of glycerin, phosphoric acid was used, which was then neutralized with sodium hydroxide [52]. The green color resulted from the addition of an external color (artificial coloring).…”

Section: Glycerol Purifications and Applicationmentioning

confidence: 99%

Biodiesel and Bioplastic Production from Waste-Cooking-Oil Transesterification: An Environmentally Friendly Approach

et al. 2022

View full text Add to dashboard Cite

Alternative sources of fuel have been a concern in the last few decades. The growth of urbanization and industrialization will lead to the exhaustion of fossil fuels, attracting studies on alternative routes. The main aim of this study was to produce biodiesel from waste cooking oil (WCO) by methyl transesterification using sodium hydroxide as a catalyst. For this, the physicochemical parameters of biodiesel were studied in triplicate (density, acidity, saponification, viscosity, corrosiveness to copper, visual appearance, and cloud point). An analysis by thin layer chromatography and infrared spectrometry was also performed. The increase in yield (83.3%) was directly proportional to the increase in the catalyst (0.22 g of NaOH). The infrared absorption spectra of WCO and biodiesel showed the presence of common and singular bands of each material. Furthermore, a simple and low-cost mechanism was proposed for purifying glycerol. The spectra of glycerol versus purified glycerin showed that the glycerin produced was pure, being used in the formulation of bioplastic. The product was checked for biodegradation and photodegradation, with incredible soil-degradation times of 180 days and photodegradation of only 60 days. In this way, biodiesel production from WCO showed environmentally friendly proposals and applicability. As the next steps, it is necessary to test the biodiesel produced in combustion engines and improve the bioplastic production, including a spectroscopic characterization and extensive biodegradation testing.

show abstract

FTIR and31P-NMR Spectroscopic Analyses of Surface Species in Phosphate-Catalyzed Lactic Acid Conversion

Cited by 55 publications

References 0 publications

Catalytic conversion of lactic acid into propylene glycol over various metals supported on silica

Catalytic conversion of lactic acid into propylene glycol over various metals supported on silica

A novel degradable tricalcium silicate/calcium polyphosphate/polyvinyl alcohol organic-inorganic composite cement for bone filling

Biodiesel and Bioplastic Production from Waste-Cooking-Oil Transesterification: An Environmentally Friendly Approach

Contact Info

Product

Resources

About