The operation of an industrial semi-batch reactor, in which the bulk chemical EHEC, ethyl hydroxyethyl cellulose, is produced, is studied and simulated. In the reactor a strongly exothermic polymerization reaction takes place followed by a slightly exothermic reaction, and we want to minimize the duration of the operation of the process. Various operational as well as quality and safety related...

Water dissociation on copper is one of the rate-limiting steps in the water-gas-shift (WGS) reaction. Copper atoms dispersed evenly from freshly made catalyst segregate to form clusters under the WGS operating conditions. Using density functional theory, we have examined water adsorption and dissociation on the smallest stable 3-dimensional copper cluster, Cu(7). Water molecules are adsorbed on...

Gas Phase Deposition In article number 2300448, Heiko O. Jacobs and co-workers propose gas phase route towards localised deposition of Pt/Al reactive layers. Nanoparticulate multilayers when ignited, undergoes self-propagating exothermic reaction forming bimetallic alloys with cubic structure as demonstrated in the cover image. Heat release locally melts multilayered nanomaterial to form surfac...

Mathematical models for an adiabatic tubular chemical reactor which forms irreversible exothermic reaction are investigated by efficient numerical technique, Fibonacci Collocation method in this study. The reaction's steady-state temperature is calculated several values of three parameters, namely, Peclet and Damkohler numbers the dimensionless increment. When generated outcomes compared with o...

Ammonia (NH3) dissociation and oxidation in a cylindrical quartz reactor has been experimentally studied for various inlet NH3 concentrations (5%, 10%, 15%) temperatures between 700 K 1000 K. The thermal effects during both (endothermic) (exothermic) were observed using bundle of thermocouples positioned along the central axis reactor, while corresponding conversions nitrogen oxides emissions d...

When an earthquake occurs, it is not only the crustal material in seismic zone that moves violently; waves of with certain level energy can act on crust over large areas, producing remote effects affect living environment. According to records long-term observation station Chinese Continental Scientific Drilling, near-surface caused by post-earthquake include following four aspects: (1) pore fi...

Previous chemical heater designs for isothermal nucleic acid amplification have been based on solid-liquid phase transition, but using this approach, developers have identified design challenges en route to developing a low-cost, disposable device. Here, we demonstrate the feasibility of a new heater configuration suitable for isothermal amplification in which one reactant of an exothermic reac...

In an earlier publication [1] it has been claimed that oxidative coupling of methane to higher hydrocarbons had been obtained with close to 100% selectivity at 600~ and atmospheric pressure in the presence of steam over a CaNiK oxide catalyst. These results have been confirmed in longer runs. Artifacts, such as carbonate formation on the catalyst, have been excluded. The reaction is slightly ex...

An efficient reaction cascade delivering a series of pyrrolo[1,2-a]quinolines bearing phosphonate or phosphine oxide moieties is presented. This sequence exploits the in situ transformation of propargylic alcohols into transient allenes by means of a strategic [2,3]-sigmatropic rearrangement followed by trapping of the resulting allenes by an adjacent pyrrole ring. Furthermore, the initial smal...