Fast temperature cycling in microstructure devices

Pulsed activation in heterogeneous catalysis

“…However, in comparison to temperature cycling experiments reported in literature [64,74,67] the pulses created are almost four orders of magnitude faster at similar amplitudes. Note that the cited studies, while operating at cycling times of 1 − 10 s, are already reporting results which cannot be explained by the quasi steady state approximation (see section 1.6).…”

“…Specifically, van Neer and co-authors [59] is the primary reference for periodic temperature actuation of catalytic reactions, see e.g. the review by Silveston [47] and the more recent microreactor temperature forcing studies [64,65].…”

“…Specifically, Rouge and coworkers [122], Brandner and coworkers [64,94,95] and Jensen and coworkers [65] have published results on temperature cycling in the order of 10 1 − 10 2 K at frequencies in the order of 10 −1 − 10 0 Hz by using microstructured reactor designs. Sotowa and coworkers [67] achieved temperature cycling with an amplitude in the order of 10 2 − 10 3 K with a period in the order of 10 0 Hz by using a free floating heated wire.…”

“…More recently, several forced temperature studies have been performed in microreactor setups by two separate groups. Luther and coworkers built several devices for periodic temperature operation [64,94,95] and tested them on the CO oxidation reaction over a supported platinum catalyst (Pt/Al 2 O 3 ). Initially, they demonstrated the same trivial rate improvement, but further investigations showed up to 70% extra conversion over the QSS associated with that form of operation (thus beating the dashed line in figure 5.1).…”

Microstructured Reactors for Catalytic Reactions

“…Recently, microstructure devices for ''fast temperature cycling'' have been also described [86,87]. The devices allowed to obtain a periodic temperature change of 100 K within less than a second.…”