Engelhard titanosilicate

The good news is that such a filter exists. Recent work by Steven Kuznicki and Valerie Bell at Engelhard Corporation in New Jersey and Michael Tsapatsis at the University of Massachusetts has produced a molecular sieve in which the pore (passage) sizes can be adjusted precisely enough to separate N2 molecules from CH4 molecules. The material involved is a special hydrated titanosilicate (contains H2O, Ti, Si, O, and Sr) compound patented by Engelhard known as ETS-4 (Engelhard TitanoSilicate-4). When... 

Yazdanbakhsh et al. [158] reported the H2S breakthrough capacity of copper-exchanged Engelhard Titanosilicate-2 (ETS-2). The adsorbent efficiency remains unchanged up to 950 °C. Below 750 °C, the adsorption capacity at breakthrough is 0.7 mol of H2S per mol of copper while >750 °C the capacity of the adsorbent is halved. The change in H2S capacity is due to Cu + reduction by the H2 which is formed through the thermal dissociation of H2S. 

---