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Bifurcated Dihydrogen Bonding in the Uptake of Gas-Phase Diborane on Silica

“…8 However, a recent investigation suggested that, under packed-bed flow conditions, reactions of B 2 H 6 with silica require water. 13 Our results are consistent with this hypothesis and strongly suggest that, in the absence of water, the B 2 H 6 + silanol interactions are nondissociative in nature.…”

“…In the previous studies, reactions of B 2 H 6 with interfacial Si–OH groups were hypothesized to occur via direct elimination of H 2 to produce surface-bound Si–O–B 2 H 5 . ,, Others speculated that surface reactions of B 2 H 6 occurred through dissociative adsorption at surface siloxane bridges . However, a recent investigation suggested that, under packed-bed flow conditions, reactions of B 2 H 6 with silica require water . Our results are consistent with this hypothesis and strongly suggest that, in the absence of water, the B 2 H 6 + silanol interactions are nondissociative in nature.…”

Online Detection of Selenium and Its Retention in Reducing Gasification Atmosphere

“…These experiments show the formation of a Se phase in dry gas atmosphere as revealed by postexperimental analysis of the sorbent by ICP-MS (7700x, Agilent; about 1.3 mg Se /g Sorbent , measured from solution of the digested support). This finding is concurrent with earlier studies performed at lower temperatures . However, as steam (5 vol %(rx)) is added to the gas mixture, no Se (below detection limit of 2 μg Se /g Sorbent , measured by ICP-MS from solution of the digested support) on the Al 2 O 3 support can be detected.…”

“…Both H 2 Se and H 2 O are species known to adsorb onto the surface of γ-Al 2 O 3 . − In order to evaluate their interaction under the chosen reaction conditions (250 °C; reactor inlet: 40 vol %(rx) H 2 , 4770 ppbv­(rx) H 2 Se, balance Ar), blank experiments involving only the Al 2 O 3 support were performed. These experiments show the formation of a Se phase in dry gas atmosphere as revealed by postexperimental analysis of the sorbent by ICP-MS (7700x, Agilent; about 1.3 mg Se /g Sorbent , measured from solution of the digested support).…”

“…γ-Al 2 O 3 as a support can interact with both H 2 Se and steam present in the gas. Watanabe et al investigated the adsorption of H 2 Se onto γ-Al 2 O 3 in dry N 2 atmosphere at room temperature. In their experiments, H 2 Se is adsorbed by both physisorption and chemisorption to significant extents.…”