scholarly journals Latent curing systems stabilized by reaction equilibrium in homogeneous mixtures of benzoxazine and amine

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jun Wang ◽  
Ya Zhen Xu ◽  
Ya Fei Fu ◽  
Xiang Dong Liu
Keyword(s):  
Latent Curing Systems ◽  
Reaction Equilibrium ◽  
Curing Systems

The chemistry of new latent curing systems for epoxy resins

1961 ◽  
Vol 5 (15) ◽  
pp. 370-374 ◽  
Author(s):  
S. H. Langer ◽  
I. N. Elbling ◽  
A. B. Finestone ◽  
W. R. Thomas
Keyword(s):  
Epoxy Resins ◽  
Latent Curing Systems ◽  
Curing Systems

scholarly journals Glycerol Hydrogenolysis with In Situ Hydrogen Produced via Methanol Steam Reforming: The Promoting Effect of Pd on a Cu/ZnO/Al2O3 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 110
Author(s):  
Yuanqing Liu ◽  
Chau T. Q. Mai ◽  
Flora T. T. Ng
Keyword(s):  
Steam Reforming ◽  
Catalyst Activity ◽  
Promoting Effect ◽  
Glycerol Conversion ◽  
Glycerol Hydrogenolysis ◽  
Glycerol Dehydration ◽  
Effect Of Pd ◽  
Al2o3 Catalyst ◽  
Reaction Equilibrium

The glycerol hydrogenolysis to produce 1,2-propanediol without using externally supplied hydrogen was investigated using methanol present in crude glycerol to provide in situ hydrogen via its steam reforming reaction. This paper focuses on the promoting effect of Pd on the reactivity of a Cu/Zn/Al2O3 catalyst. Adding 2 wt% Pd onto a Cu/ZnO/Al2O3 catalyst significantly improved the selectivity to 1,2-propanediol from 63.0% to 82.4% and the glycerol conversion from 70.2% to 99.4%. This enhancement on the catalytic activity by Pd is mainly due to the improved hydrogenation of acetol, which is the intermediate formed during the glycerol dehydration. The rapid hydrogenation of acetol can shift the reaction equilibrium of glycerol dehydration forward resulting in a higher glycerol conversion. The improved reducibility of the catalyst by Pd allows the catalyst to be reduced in situ during the reaction preventing any loss of catalyst activity due to any potential oxidation of the catalyst. The catalyst was slightly deactivated when it was firstly recycled resulting in a 5.4% loss of glycerol conversion due to the aggregation of Cu and the deactivation became less noticeable upon further recycling.

Influence of Combined Sulfur and Peroxide Curing Systems and Ageing on the Properties of Rubber Magnets

2021 ◽  
Vol 395 (1) ◽  
pp. 2000258
Author(s):  
Ján Kruželák ◽  
Andrea Kvasničáková ◽  
Klaudia Hložeková ◽  
Jarmila Vilčáková ◽  
Ivan Hudec
Keyword(s):  
Peroxide Curing ◽  
Curing Systems

scholarly journals SiC mesoporous membranes for sulfuric acid decomposition at high temperatures in the iodine–sulfur process

RSC Advances ◽  
2020 ◽  
Vol 10 (68) ◽  
pp. 41883-41890
Author(s):  
Xin Yu ◽  
Qing Wang ◽  
Hiroki Nagasawa ◽  
Masakoto Kanezashi ◽  
Toshinori Tsuru
Keyword(s):  
Sulfuric Acid ◽  
High Temperatures ◽  
Membrane Reactor ◽  
Acid Decomposition ◽  
Sic Particles ◽  
Sulfuric Acid Decomposition ◽  
Mesoporous Membranes ◽  
Mesoporous Membrane ◽  
Reaction Equilibrium

In the present study, SiC particles derived mesoporous membrane was discovered and applied to membrane reactor for H2SO4 decomposition. The reaction equilibrium was moved the to the product side by membrane reactor with extraction at 600 °C.

scholarly journals Mechanical Properties of Carbon-Fiber RPC and Design Method of Carbon-Fiber Content under Different Curing Systems

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3759 ◽  
Author(s):  
Xuejian Zhang ◽  
Lincai Ge ◽  
Yunlong Zhang ◽  
Jing Wang
Keyword(s):  
Carbon Fiber ◽  
Design Method ◽  
Fiber Content ◽  
Practical Application ◽  
X Ray Diffraction ◽  
Curing Conditions ◽  
Influencing Mechanism ◽  
Reactive Powder ◽  
Curing Compound ◽  
Curing Systems

Natural, standard, and compound curing are adopted to study the effect of different curing systems on the reinforcement of carbon fiber in reactive powder concrete (RPC). This work systematically studies the changes in RPC compressive and tensile strengths under different curing systems. Taking age, fiber content, and curing system as parameters, Scanning electron microscope (SEM) and X-ray diffraction (XRD) microscopic methods are used to study the influencing mechanism of carbon-fiber content and curing systems on RPC. The calculation methods of the RPC strength of different carbon-fiber contents are studied. Results show that the optimum carbon-fiber content of carbon-fiber RPC is 0.75% under the natural, standard, and compound curing conditions. In comparison with standard curing, compound curing can improve the early strength of carbon-fiber RPC and slightly affect the improvement of late strength. The strength is slightly lower in natural curing than in standard curing, but the former basically meets the requirements of the project and is beneficial for the practical application of this project. The calculation formula of 28-day compressive and splitting tensile strengths of carbon-fiber content from 0% to 0.75% is proposed to select the carbon-fiber content flexibly to satisfy different engineering requirements.

Rubber Magnetic Composites Cross-Linked with Peroxide Curing Systems

2019 ◽  
Vol 61 (6) ◽  
pp. 865-873
Author(s):  
Ján Kruželák ◽  
Elena Medlenová ◽  
Andrea Kvasničáková ◽  
Rastislav Dosoudil ◽  
Ivan Hudec ◽  
...  
Keyword(s):  
Magnetic Composites ◽  
Peroxide Curing ◽  
Curing Systems

Hydrogen Production via Catalytic Autothermal Reforming of Desulfurized Jet-A Fuel

2016 ◽  
Author(s):  
Shuyang Zhang ◽  
Xiaoxin Wang ◽  
Peiwen Li
Keyword(s):  
Energy Efficiency ◽  
Hydrogen Production ◽  
Hydrogen Storage ◽  
Coke Formation ◽  
Autothermal Reforming ◽  
Operating Conditions ◽  
Hydrogen Yield ◽  
Fuel Conversion ◽  
Optimal Operating ◽  
Reaction Equilibrium

On-board hydrogen production via catalytic autothermal reforming is beneficial to vehicles using fuel cells because it eliminates the challenges of hydrogen storage. As the primary fuel for both civilian and military air flight application, Jet-A fuel (after desulfurization) was reformed for making hydrogen-rich fuels in this study using an in-house-made Rh/NiO/K-La-Ce-Al-OX ATR catalyst under various operating conditions. Based on the preliminary thermodynamic analysis of reaction equilibrium, important parameters such as ratios of H2O/C and O2/C were selected, in the range of 1.1–2.5 and 0.5–1.0, respectively. The optimal operating conditions were experimentally obtained at the reactor’s temperature of 696.2 °C, which gave H2O/C = 2.5 and O2/C = 0.5, and the obtained fuel conversion percentage, hydrogen yield (can be large than 1 from definition), and energy efficiency were 88.66%, 143.84%, and 64.74%, respectively. In addition, a discussion of the concentration variation of CO and CO2 at different H2O/C, as well as the analysis of fuel conversion profile, leads to the finding of effective approaches for suppression of coke formation.

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