Selective C2+ Alcohol Synthesis from CO2 Hydrogenation via Reaction-Coupling Strategy

Higher alcohol synthesis (HAS) from non-petroleum carbon resources (a mixture of H2 and CO2) is an attractive but challenging research target. This reaction still suffers from poor higher alcohol (HA)...

Coexpression Analysis Identified PcMYB25 as a Patchoulol Synthase Gene Activator to Enhance Patchouli Alcohol Biosynthesis in Pogostemon Cablin

BackgroundPatchouli alcohol is an effective component of the medicinal plant patchouli. Similar to other secondary metabolites, its synthesis is likely also regulated by transcription factors. Although the biosynthetic pathway of patchouli alcohol has been characterized, the regulatory mechanism of patchouli alcohol biosynthesis has not been fully revealed.ResultsThis study combined the transcriptome data of patchouli leaves treated with different hormones and WGCNA to establish a coexpression network. The modules correlated to patchouli alcohol content were identified, and PcMYB25 played a crucial role in regulating patchouli alcohol biosynthesis. The overexpression of PcMYB25 can promote the expression of patchouli alcohol synthase (PTS), thereby increasing the content of patchouli alcohol.Conclusions This is the first report that MYB25 regulates the secondary metabolism of patchouli. These experimental results lay the foundation for further analysis of the regulatory mechanism of patchouli alcohol synthesis.

Modified Composite Based on Magnetite and Polyvinyl Alcohol: Synthesis, Characterization, and Degradation Studies of the Methyl Orange Dye from Synthetic Wastewater

The goal of the present paper was to synthesize, characterize, and evaluate the performance of the modified composite based on magnetite (Fe3O4) and polyvinyl alcohol (PVA). The obtained composite was used to degrade Methyl Orange dye from synthetic wastewater by a laboratory photocatalytic reactor. Various parameters of the photodegradation process were tested: composite dosage, amount of hydrogen peroxide (H2O2), and pH. The composite was characterized by Fourier Transform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). The degradation experiments indicated that the complete dye decolorization depended on the amount of H2O2. In addition, the H2O2 could accelerate Methyl Orange degradation to more highly oxidized intermediates in the presence of UV light (99.35%). The results suggested that the obtained modified composite could be used to treat wastewater containing various types of dyes.

Carbon-Supported KCoMoS2 for Alcohol Synthesis from Synthesis Gas

KCoMoS2 was supported on various carbon support materials to study the support effect on synthesis gas conversion. Next to two activated carbons with high micropore volume, a traditional alumina (γ-Al2O3) support and its carbon coated form (CCA) were studied for comparison. Coating alumina with carbon increases the selectivity to alcohols, but the AC-supported catalysts show even higher alcohol selectivities and yields, especially at higher temperatures where the conversions over the AC-supported catalysts increase more than those over the γ-Al2O3-based catalysts. Increasing acidity leads to decreased CO conversion yield of alcohols. The two activated-carbon-supported catalysts give the highest yield of ethanol at the highest conversion studied, which seems to be due to increased KCoMoS2 stacking and possibly to the presence of micropores and low amount of mesopores.

Nano-Magnetic NiFe2O4 and Its Photocatalytic Oxidation of Vanillyl Alcohol—Synthesis, Characterization, and Application in the Valorization of Lignin

Here, we report on a phyto-mediated bimetallic (NiFe2O4) preparation using a Boswellia carterii extract, which was characterized by XRD, FT-IR, TGA, electron microscopy, magnetic spectroscopy, and Mössbauer spectroscopy measurements. The prepared nano-catalysts were tested for oxidation of lignin monomer molecules—vanillyl alcohol and cinnamyl alcohol. In comparison with previously reported methods, the nano NiFe2O4 catalysts showed high photocatalytic activity and selectivity, under visible light irradiation with a nitroxy radical initiator (2,2,6,6-tetramethylpiperidinyloxy or 2,2,6,6-tetramethylpiperidine 1-oxyl; TEMPO) at room temperature and aerobic conditions. The multifold advantages of the catalyst both in terms of reduced catalyst loading and ambient temperature conditions were manifested by higher conversion of the starting material.