With the EPA taking tougher stances on coal emissions a it seems that it's not going to be economically viable to use coal as a fuel source in a utility combustion boiler. I was curious if anyone as worked with chemical looping combustion for the purpose of power generation.
https://en.wikipedia.org/wiki/Chemical_looping_combustion
It's a technology that caught my interest and was wondering how well it would scale up and if there are any applications of it's use currently. If it's practical on an efficiency standpoint etc.
Have any of you come across it before in use or in academia?
For example Pentane which is C5H12. I know incomplete combustion is Pentane+1/2 Oxygen> Water+Carbon Dioxide but how do you balance it when in chemical form. Can someone help please if possible thank you.
I'm looking for reagent(s) to add to a slab of wood that will change the appearance/texture (excluding wood stain or combustion).
A carbohydrate such as cornstarch is able to combust, but it’s balanced equation (following the general equation for combustion) is extremely large and arbitrary. Like, 5 C27H48O20 + 85O2 = 135 CO2 + 12 H20. Is this still correct? FYI, this is for an experiment on ‘fire breathing’ using powdered starches and carbohydrates. Thanks so much :)
The loading–reaction‐barrier relationship over VO x /TiO2 catalysts is investigated for chemical looping oxidative dehydrogenation of propane. Sub‐monolayer or monolayer vanadia nanostructures, compared with conventional crystalline V2O5 oxygen carriers, dramatically suppress the CO2 co‐production by evading O2− bulk diffusion and subsequent evolution into surface electrophilic oxygen species.
Abstract
Chemical looping provides an energy‐ and cost‐effective route for alkane utilization. However, there is considerable CO2 co‐production caused by kinetically mismatched O2− bulk diffusion and surface reaction in current chemical looping oxidative dehydrogenation systems, rendering a decreased olefin productivity. Sub‐monolayer or monolayer vanadia nanostructures are successfully constructed to suppress CO2 production in oxidative dehydrogenation of propane by evading the interference of O2− bulk diffusion (monolayer versus multi‐layers). The highly dispersed vanadia nanostructures on titanium dioxide support showed over 90 % propylene selectivity at 500 °C, exhibiting turnover frequency of 1.9×10−2 s−1, which is over 20 times greater than that of conventional crystalline V2O5. Combining in situ spectroscopic characterizations and DFT calculations, we reveal the loading–reaction barrier relationship through the vanadia/titanium interfacial interaction.
https://ift.tt/2YyCYWa
Please respond quickly because my chemistry homework is due tomorrow.
Edit: Thanks for your help everybody, I understand it now.
The loading–reaction‐barrier relationship over VO x /TiO2 catalysts is investigated for chemical looping oxidative dehydrogenation of propane. Sub‐monolayer or monolayer vanadia nanostructures, compared with conventional crystalline V2O5 oxygen carriers, dramatically suppress the CO2 co‐production by evading O2− bulk diffusion and subsequent evolution into surface electrophilic oxygen species.
Abstract
Chemical looping provides an energy‐ and cost‐effective route for alkane utilization. However, there is considerable CO2 co‐production caused by kinetically mismatched O2− bulk diffusion and surface reaction in current chemical looping oxidative dehydrogenation systems, rendering a decreased olefin productivity. Sub‐monolayer or monolayer vanadia nanostructures are successfully constructed to suppress CO2 production in oxidative dehydrogenation of propane by evading the interference of O2− bulk diffusion (monolayer versus multi‐layers). The highly dispersed vanadia nanostructures on titanium dioxide support showed over 90 % propylene selectivity at 500 °C, exhibiting turnover frequency of 1.9×10−2 s−1, which is over 20 times greater than that of conventional crystalline V2O5. Combining in situ spectroscopic characterizations and DFT calculations, we reveal the loading–reaction barrier relationship through the vanadia/titanium interfacial interaction.
https://ift.tt/2YyCYWa
Chemical looping provides an energy and cost effective route for alkane utilization. However, there is considerable CO 2 co‐production caused by kinetically mismatched O 2‐ bulk diffusion in current chemical looping oxidative dehydrogenation systems, rendering a decreased olefin productivity. This paper describes the successful construction of sub‐monolayer or monolayer vanadia nanostructures to suppress CO 2 production in oxidative dehydrogenation of propane by evading the interference of O 2‐ bulk diffusion (monolayer versus multi‐layer). The highly dispersed vanadia nanostructures on titanium dioxide support showed over 90% propylene selectivity at 500 °C, exhibiting highest turnover frequency of 1.9×10 ‐2 s ‐1 , which is over 20 times greater than that of conventional crystalline V 2 O 5 oxygen carriers. Combining in situ spectroscopic characterizations and density functional theory calculation, we revealed the loading–reaction barrier relationship through the vanadia/titanium interfacial interaction. This work demonstrates that sub‐monolayer or monolayer nanostructures have the potential to serve as a general oxygen carrier materials platform for redox reactions.
https://ift.tt/2YyCYWa
