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Mesoporous silica with mean pore size of ∼14 nm was coated by polydimethylsiloxane (PDMS) using a thermal deposition method. We showed that the inner walls of pores larger than ∼8 nm can be coated by thin layers of PDMS, and the surfaces consisting of PDMS-coated silica were superhydrophobic, with water contact angles close to 170°. We used the PDMS-coated silica as adsorbents of various gas-phase chemical warfare agent (CWA) simulants. PDMS-coated silica allowed molecular desorption of various CWA simulants even after exposure under highly humid conditions and, therefore, is applicable as an agent for the preconcentration of gas-phase analytes to enhance the sensitivities of various sensors.

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The reverse water gas shift (RWGS) reaction catalyzed by barium zirconate-based perovskite-type catalysts doped with Y, Zn, and Ce was investigated in terms of activities and chemical stabilities of various catalysts. All of the catalysts showed stable performances for the RWGS reaction at 600°C for 5 h, and in particular, the BaZr 0.8 Y 0.16 Zn 0.04 O 3 (BZYZ) catalyst showed an outstanding activity with an average CO 2 conversion of 37.5% and a CO selectivity of 97%. Insertion of additional Ce into the BZYZ structure did not have any positive effect on catalytic activity for the RWGS reaction, even though the ionic conductivity of BZYZ was improved by Ce insertion.