Role of 1-Methyl-3-Ethylbenzimidazolium Bromide-Ruthenium Catalyst in the One-step Production of Ethylene Glycol via Formaldehyde Condensation and in its Direct Synthesis from Synthesis Gas

1987 ◽  
Vol 42 (3) ◽  
pp. 389-393 ◽  
Author(s):  
Kazuhisa Murata ◽  
Akio Matsuda ◽  
Takashi Masuda ◽  
Yoshihisa Kiso ◽  
Kenji Saeki
Keyword(s):  
Ethylene Glycol ◽  
Synthesis Gas ◽  
Direct Synthesis ◽  
Ruthenium Catalyst ◽  
One Step ◽  
The One

ChemInform Abstract: Cycling Properties of Sc- and Ce-Doped NaAlH4Hydrogen Storage Materials Prepared by the One-Step Direct Synthesis Method.

ChemInform ◽  
2009 ◽  
Vol 40 (22) ◽  
Author(s):  
Borislav Bogdanovic ◽  
Michael Felderhoff ◽  
Andre Pommerin ◽  
Ferdi Schueth ◽  
Nick Spielkamp ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
Synthesis Method ◽  
Storage Materials ◽  
One Step ◽  
The One

1-Alkylbenzimidazoles as unique promoters for a homogeneous ruthenium catalyst for direct ethylene glycol formation from synthesis gas

1987 ◽  
Vol 335 (3) ◽  
pp. C27-C31 ◽  
Author(s):  
Yoshihisa Kiso ◽  
Kenji Saeki ◽  
Tetsuo Hayashi ◽  
Masahide Tanaka ◽  
Yuichi Matsunaga ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Synthesis Gas ◽  
Ruthenium Catalyst

Synthesis of Oxygenates from Synthesis Gas over CuO/ZnO/Al2O3 Catalyst: The Role of a Dehydrating Component

2018 ◽  
Vol 18 (5) ◽  
pp. 12-18 ◽  
Author(s):  
M. A. Kipnis ◽  
I. A. Belostotskiy ◽  
E. A. Volnina ◽  
G. I. Lin
Keyword(s):  
Quartz Glass ◽  
Flow Rate ◽  
Synthesis Gas ◽  
Commercial Catalyst ◽  
Stage Synthesis ◽  
The Difference ◽  
Synthesis Of Methanol ◽  
The One ◽  
Al2o3 Catalyst

The influence of the flow rate on parameters of bifunctional catalysts with different dehydrating components in the synthesis of methanol/dimethyl ether (DME) from synthesis gas (19.1 vol.% CO, 5.9 vol.% CO2, 5.5 vol.% N2, rest H2) at 260 °C and 3 MPa was studied. The commercial catalyst Megamax 507 was used as the methanol agent and active γ-alumina as dehydrating agent, quartz glass, which is inert to methanol dehydration, being used for comparison. At flow rate below 20,000 L·(kgcat·h)–1, the conversion of CO and oxygenate capacity (calculated as C1) was higher over alumina-containing samples than over quartz glass. This observation was accounted for by a decrease in the rate of the reverse reaction of methanol with water at the partial conversion of methanol to DME to lead eventually to an increase in the methanol yield. The benefit of the one-stage synthesis against two-stage synthesis of oxygenates depended on the load: as the load increased, the difference in the capacity went through maximum.

Cycling properties of Sc- and Ce-doped NaAlH4 hydrogen storage materials prepared by the one-step direct synthesis method

2009 ◽  
Vol 471 (1-2) ◽  
pp. 383-386 ◽  
Author(s):  
Borislav Bogdanović ◽  
Michael Felderhoff ◽  
André Pommerin ◽  
Ferdi Schüth ◽  
Nick Spielkamp ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Hydrogen Storage Materials ◽  
Storage Materials ◽  
One Step ◽  
The One

Ultrastructure of bovine in vitro-produced blastocysts cryopreserved by vitrification

Zygote ◽  
1998 ◽  
Vol 6 (1) ◽  
pp. 17-26 ◽  
Author(s):  
Shigeki Ohboshi ◽  
Noboru Fujihara ◽  
Tatsuyuki Yoshida ◽  
Hiroshi Tomagane
Keyword(s):  
Ethylene Glycol ◽  
Cellular Damage ◽  
Bovine Embryos ◽  
Step Procedure ◽  
Direct Exposure ◽  
Subsequent Exposure ◽  
One Step ◽  
The One ◽  
Serious Injuries

SummaryThe objective of this study was to examine ultrastructural aspects of bovine in vitro-produced blastocysts associated with cryopreservation by vitrification. Morphologically good embryos were used and treated with ethylene-glycol-based vitrification solution (VS). The untreated embryos had conventional fine structure. The post-warming embryos treated with direct exposure to VS (one-step procedure) showed cellular damage structurally by cryopreservation, which included loss of microvilli, disruption of the plasma membrane, mitochondrial changes and swelling of the endoplasmic reticulum. However, nuclei and junctional regions seemed to be resistant to cryoinjury. In contrast, the post-warming embryos pre-equilibra ted with 10% ethylene glycol for 5 min and subsequent exposure to VS (two-step procedure) showed less damage than those treated by the one-step procedure. Post-warming embryos treated by the two-step procedure were cultured in vitro for 18 h. Some embryos survived and their structures re-formed to the former state, while other embryos showed serious injuries and could not reconstitute the blastocoele. Three post-warming embryos treated by the two-step procedure that survived after in vitro culture were transferred to three recipients and one of these resulted in pregnancy. These results indicate that cryopreservation by vitrification can damage membranous structures of the cells of bovine embryos, the extent and nature of this damage being dependent on the vitrification procedure.

scholarly journals Hydrogen and Oxygen Evolution in a Membrane Photoreactor Using Suspended Nanosized Au/TiO2 and Au/CeO2

2019 ◽  
Vol 3 (1) ◽  
pp. 5 ◽  
Author(s):  
Tiziana Marino ◽  
Alberto Figoli ◽  
Antonio Molino ◽  
Pietro Argurio ◽  
Raffaele Molinari
Keyword(s):  
Oxygen Evolution ◽  
Membrane Reactor ◽  
Experimental Tests ◽  
Ion Concentration ◽  
Oxygen Generation ◽  
Photocatalytic System ◽  
One Step ◽  
The One ◽  
Positive Effect

Photocatalysis combined with membrane technology could offer an enormous potential for power generation in a renewable and sustainable way. Herein, we describe the one-step hydrogen and oxygen evolution through a photocatalytic membrane reactor. Experimental tests were carried out by means of a two-compartment cell in which a modified Nafion membrane separated the oxygen and hydrogen evolution semi-cells, while iron ions permeating through the membrane acted as a redox mediator. Nanosized Au/TiO2 and Au/CeO2 were employed as suspended photocatalysts for hydrogen and oxygen generation, respectively. The influence of initial Fe3+ ion concentration, ranging from 5 to 20 mM, was investigated, and the best results in terms of hydrogen and oxygen evolution were registered by working with 5 mM Fe3+. The positive effect of gold on the overall water splitting was confirmed by comparing the photocatalytic results obtained with the modified/unmodified titania and ceria. Au-loading played a key role for controlling the photocatalytic activity, and the optimal percentage for hydrogen and oxygen generation was 0.25 wt%. Under irradiation with visible light, hydrogen and oxygen were produced in stoichiometric amounts. The crucial role of the couple Fe3+/Fe2+ and of the membrane on the performance of the overall photocatalytic system was found.

Activity and Deactivation of ZSM–5 Catalysts in the Dimethyl Ether Synthesis from CO and H2 and Methanol Dehydration

2016 ◽  
Vol 683 ◽  
pp. 406-414 ◽  
Author(s):  
Pavel Musich ◽  
Lubov Shilyaeva ◽  
Larisa Kurina ◽  
Alexander Vosmerikov ◽  
Natalia Kosova
Keyword(s):  
Dimethyl Ether ◽  
Synthesis Gas ◽  
Condensation Products ◽  
Dimethyl Ether Synthesis ◽  
Before And After ◽  
One Step ◽  
Increasing Demand ◽  
The One ◽  
Ether Synthesis ◽  
Synthesis Of Dimethyl Ether

The increasing demand for producing dimethyl ether from synthesis gas explains the renewed interest in studying the activity and stability of catalysts. In the present work, resource catalytic testing of ZSM-5 zeolites was carried out in the one-step synthesis of dimethyl ether from synthesis gas for 120 hours. Formation of condensation products was observed on zeolite surface after catalytic tests which leads to lower catalytic activity of samples. Condensation products were investigated by thermal analysis in an oxidizing atmosphere. Textural characteristics of zeolites before and after reaction were investigated. It was shown that methanol significantly contribute to formation of condensation products on the catalyst surface in the process of dimethyl ether production.

scholarly journals Synthesis of Poly(Trimethylene Carbonate) from Amine Group Initiation: Role of Urethane Bonds in the Crystallinity

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 280
Author(s):  
Thomas Brossier ◽  
Gael Volpi ◽  
Vincent Lapinte ◽  
Sebastien Blanquer
Keyword(s):  
Thermal Studies ◽  
Trimethylene Carbonate ◽  
X Ray Diffraction ◽  
One Pot ◽  
Free Process ◽  
One Step ◽  
The One ◽  
Natural Amino Acids ◽  
The Impact

Semi-crystalline poly(trimethylene carbonate) (PTMC) can be efficiently prepared by ring-opening polymerization (ROP) initiated by amine using various catalysts. More promising results were reached with the one-step process of stannous octanoate unlike the two-step one-pot reaction using TBD and MSA catalysts. The ROP-amine of TMC consists in a simple isocyanate free process to produce polycarbonate-urethanes, compatible with the large availability of amines ranging from mono- to multifunctional until natural amino acids. ROP-amine of TMC leads to urethane bonds monitored by FTIR spectroscopy. The relationship between the nature of amines and the crystallinity of PTMC was discussed through X-ray diffraction and thermal studies by DSC and TGA. The impact of the crystallinity was also demonstrated on the mechanical properties of semi-crystalline PTMC in comparison to amorphous PTMC, synthesized by ROP initiated by alcohol. The semi-crystalline PTMC synthesized by ROP-amine opens many perspectives.

Sign in / Sign up

Export Citation Format

Share Document