Direct Production of Higher Oxygenates by Syngas Conversion over a Multifunctional Catalyst

2019 ◽  
Vol 58 (14) ◽  
pp. 4627-4631 ◽  
Author(s):  
Tiejun Lin ◽  
Xingzhen Qi ◽  
Xinxing Wang ◽  
Lin Xia ◽  
Caiqi Wang ◽  
...  
Keyword(s):  
Direct Production ◽  
Syngas Conversion ◽  
Multifunctional Catalyst

Direct Production of Higher Oxygenates by Syngas Conversion over a Multifunctional Catalyst

2019 ◽  
Vol 131 (14) ◽  
pp. 4675-4679 ◽  
Author(s):  
Tiejun Lin ◽  
Xingzhen Qi ◽  
Xinxing Wang ◽  
Lin Xia ◽  
Caiqi Wang ◽  
...  
Keyword(s):  
Direct Production ◽  
Syngas Conversion ◽  
Multifunctional Catalyst

scholarly journals Direct production of olefins via syngas conversion over Co2C-based catalyst in slurry bed reactor

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4131-4139 ◽  
Author(s):  
Xinxing Wang ◽  
Tiejun Lin ◽  
Jie Li ◽  
Fei Yu ◽  
Dong Lv ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Direct Production ◽  
Syngas Conversion

Co2C-based catalyst exhibited a promising catalytic performance for direct production of olefins via syngas conversion in slurry bed reactor.

Advances in direct production of value-added chemicals via syngas conversion

2017 ◽  
Vol 60 (7) ◽  
pp. 887-903 ◽  
Author(s):  
Yunlei An ◽  
Tiejun Lin ◽  
Fei Yu ◽  
Yanzhang Yang ◽  
Liangshu Zhong ◽  
...  
Keyword(s):  
Value Added ◽  
Direct Production ◽  
Syngas Conversion

scholarly journals Designing a Multifunctional Catalyst for the Direct Production of Gasoline-Range Isoparaffins from CO2

JACS Au ◽  
2021 ◽  
Author(s):  
Abhay Dokania ◽  
Samy Ould-Chikh ◽  
Adrian Ramirez ◽  
Jose Luis Cerrillo ◽  
Antonio Aguilar ◽  
...  
Keyword(s):  
Direct Production ◽  
Multifunctional Catalyst

scholarly journals Directly converting CO2 into a gasoline fuel

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Jian Wei ◽  
Qingjie Ge ◽  
Ruwei Yao ◽  
Zhiyong Wen ◽  
Chuanyan Fang ◽  
...  
Keyword(s):  
Crucial Role ◽  
Active Sites ◽  
Catalytic Conversion ◽  
Acid Sites ◽  
Liquid Fuels ◽  
Tandem Reaction ◽  
Direct Production ◽  
Industrial Catalyst ◽  
Highly Efficient ◽  
Multifunctional Catalyst

Abstract The direct production of liquid fuels from CO2 hydrogenation has attracted enormous interest for its significant roles in mitigating CO2 emissions and reducing dependence on petrochemicals. Here we report a highly efficient, stable and multifunctional Na–Fe3O4/HZSM-5 catalyst, which can directly convert CO2 to gasoline-range (C5–C11) hydrocarbons with selectivity up to 78% of all hydrocarbons while only 4% methane at a CO2 conversion of 22% under industrial relevant conditions. It is achieved by a multifunctional catalyst providing three types of active sites (Fe3O4, Fe5C2 and acid sites), which cooperatively catalyse a tandem reaction. More significantly, the appropriate proximity of three types of active sites plays a crucial role in the successive and synergetic catalytic conversion of CO2 to gasoline. The multifunctional catalyst, exhibiting a remarkable stability for 1,000 h on stream, definitely has the potential to be a promising industrial catalyst for CO2 utilization to liquid fuels.

Directed Evolution of P450 Fatty Acid Decarboxylases via High-Throughput Screening Towards Improved Catalytic Activity

2019 ◽  
Author(s):  
Huifang Xu ◽  
Weinan Liang ◽  
Linlin Ning ◽  
Yuanyuan Jiang ◽  
Wenxia Yang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fatty Acid ◽  
Directed Evolution ◽  
High Throughput ◽  
High Throughput Screening ◽  
Colorimetric Detection ◽  
Screening Method ◽  
Random Mutagenesis ◽  
Direct Production ◽  
Consumption Activity

P450 fatty acid decarboxylases (FADCs) have recently been attracting considerable attention owing to their one-step direct production of industrially important 1-alkenes from biologically abundant feedstock free fatty acids under mild conditions. However, attempts to improve the catalytic activity of FADCs have met with little success. Protein engineering has been limited to selected residues and small mutant libraries due to lack of an effective high-throughput screening (HTS) method. Here, we devise a catalase-deficient <i>Escherichia coli</i> host strain and report an HTS approach based on colorimetric detection of H<sub>2</sub>O<sub>2</sub>-consumption activity of FADCs. Directed evolution enabled by this method has led to effective identification for the first time of improved FADC variants for medium-chain 1-alkene production from both DNA shuffling and random mutagenesis libraries. Advantageously, this screening method can be extended to other enzymes that stoichiometrically utilize H<sub>2</sub>O<sub>2</sub> as co-substrate.

Determination of non-metallic inclusions in metal alloys by spark atomic emission spectrometry (review)

2018 ◽  
Vol 84 (12) ◽  
pp. 5-19
Author(s):  
D. N. Bock ◽  
V. A. Labusov
Keyword(s):  
Spectral Line ◽  
Internal Standard ◽  
Detection Limits ◽  
Radiation Detectors ◽  
Metal Alloys ◽  
Emission Spectrometry ◽  
Direct Production ◽  
Metallic Inclusions ◽  
Dissolved Form

A review of publications regarding detection of non-metallic inclusions in metal alloys using optical emission spectrometry with single-spark spectrum registration is presented. The main advantage of the method - an extremely short time of measurement (~1 min) – makes it useful for the purposes of direct production control. A spark-induced impact on a non-metallic inclusion results in a sharp increase (flashes) in the intensities of spectral lines of the elements that comprise the inclusion because their content in the metal matrix is usually rather small. The intensity distribution of the spectral line of the element obtained from several thousand of single-spark spectra consists of two parts: i) the Gaussian function corresponding to the content of the element in a dissolved form, and ii) an asymmetric additive in the region of high intensity values ??attributed to inclusions. Their quantitative determination is based on the assumption that the intensity of the spectral line in the single-spark spectrum is proportional to the content of the element in the matter ablated by the spark. Thus, according to the calibration dependence constructed using samples with a certified total element content, it is possible not only to determine the proportions of the dissolved and undissolved element, but also the dimensions of the individual inclusions. However, determination of the sizes is limited to a range of 1 – 20 µm. Moreover, only Al-containing inclusions can be determined quantitatively nowadays. Difficulties occur both with elements hardly dissolved in steels (O, Ca, Mg, S), and with the elements which exhibit rather high content in the dissolved form (Si, Mn). It is also still impossible to determine carbides and nitrides in steels using C and N lines. The use of time-resolved spectrometry can reduce the detection limits for inclusions containing Si and, possibly, Mn. The use of the internal standard in determination of the inclusions can also lower the detection limits, but may distort the results. Substitution of photomultipliers by solid-state linear radiation detectors provided development of more reliable internal standard, based on the background value in the vicinity of the spectral line. Verification of the results is difficult in the lack of standard samples of composition of the inclusions. Future studies can expand the range of inclusions to be determined by this method.

Bioactive Secondary Metabolites from Endophytic Fungi

2020 ◽  
Vol 27 (11) ◽  
pp. 1836-1854 ◽  
Author(s):  
Elena Ancheeva ◽  
Georgios Daletos ◽  
Peter Proksch
Keyword(s):  
Secondary Metabolites ◽  
Endophytic Fungi ◽  
Host Plants ◽  
Biological Activities ◽  
Cytotoxic Agents ◽  
Special Focus ◽  
Plant Metabolites ◽  
Direct Production ◽  
Bioactive Secondary Metabolites ◽  
Fungal Genes

Background: Endophytes represent a complex community of microorganisms colonizing asymptomatically internal tissues of higher plants. Several reports have shown that endophytes enhance the fitness of their host plants by direct production of bioactive secondary metabolites, which are involved in protecting the host against herbivores and pathogenic microbes. In addition, it is increasingly apparent that endophytes are able to biosynthesize medicinally important “phytochemicals”, originally believed to be produced only by their host plants. Objective: The present review provides an overview of secondary metabolites from endophytic fungi with pronounced biological activities covering the literature between 2010 and 2017. Special focus is given on studies aiming at exploration of the mode of action of these metabolites towards the discovery of leads from endophytic fungi. Moreover, this review critically evaluates the potential of endophytic fungi as alternative sources of bioactive “plant metabolites”. Results: Over the past few years, several promising lead structures from endophytic fungi have been described in the literature. In this review, 65 metabolites are outlined with pronounced biological activities, primarily as antimicrobial and cytotoxic agents. Some of these metabolites have shown to be highly selective or to possess novel mechanisms of action, which hold great promises as potential drug candidates. Conclusion: Endophytes represent an inexhaustible reservoir of pharmacologically important compounds. Moreover, endophytic fungi could be exploited for the sustainable production of bioactive “plant metabolites” in the future. Towards this aim, further insights into the dynamic endophyte - host plant interactions and origin of endophytic fungal genes would be of utmost importance.

scholarly journals Cover Feature: Impurity Control in Catalyst Design: The Role of Sodium in Promoting and Stabilizing Co and Co 2 C for Syngas Conversion (ChemCatChem 4/2021)

ChemCatChem ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 1036-1036
Author(s):  
Arun S. Asundi ◽  
Adam S. Hoffman ◽  
Sindhu S. Nathan ◽  
Alexey Boubnov ◽  
Simon R. Bare ◽  
...  
Keyword(s):  
Catalyst Design ◽  
Syngas Conversion ◽  
Impurity Control
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