메뉴 건너뛰기
소속 기관 / 학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
고객센터 ENG
주제분류

논문 기본 정보

저자정보
출처
Royal Society of Chemistry (RSC) RSC Advances 14(26)
오류 신고하기
표지

검색

    초록·키워드

    Barium niobates with different crystalline structures and morphologies were prepared <i>via</i> a hydrothermal method and applied as a support for a ruthenium catalyst in ammonia synthesis. The sample synthesized with a nominal Ba/Nb ratio = 2.0, having a pure Ba<sub>5</sub>Nb<sub>4</sub>O<sub>15</sub> crystalline phase and uniform flake-like structure, exhibited the best performance as a support in ammonia synthesis. The flake-like substrate favored the uniform distribution of ruthenium on its surface, which could promote ruthenium to expose more B5 sites. Addition of a Ba- or Cs-promoter enhanced the activity of the Ru/Ba<sub>5</sub>Nb<sub>4</sub>O<sub>15</sub> catalyst markedly. The highest rate of ammonia synthesis over 2Cs- and 1Ba-4 wt% Ru/Ba<sub>5</sub>Nb<sub>4</sub>O<sub>15</sub> was 4900 and 3720 (μmol g<sup>-1</sup> <sub>cat</sub> h<sup>-1</sup>) at 0.1 MPa and 623 K, respectively. Both catalysts were stable during the reaction for 72 h at 673 K and 0.1 MPa. Thus, the synthesized Ba<sub>5</sub>Nb<sub>4</sub>O<sub>15</sub> is expected to be a promising oxide support for ruthenium catalysts for ammonia synthesis.

    본문·목차

    최근 본 자료 전체보기