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니켈 담지 모델촉매의 소결현상

Sintering of the Supported Nickel Model Catalysts

HWAHAK KONGHAK, June 1985, 23(3), 199-204(6), NONE
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Abstract

감마-알루미나에 담지된 니켈모델촉매의 소결현상을 젖은 수소분위기 하에서 시간과 온도의 함수로 실험하였다. 두가지 초기결정체의 크기분포, 즉, 응집분산과 균일분산을 sputtering조건을 변화시킴으로써 얻을 수 있었다. 각 니켈결정체의 변화를 추적하기 위하여 매 열처리후마다 투과전자현미경을 사용하여 시편의 같은 부분을 조사하였다. 니켈결정체의 표면은 ESCA로 관찰한 결과 산하상태로 존재함을 추측할 수 있었다. 최초의 1시간 동안에는 여러 변화들을 볼 수 있었는데 이것은 모든 가능한 소결기구를 적용하여 설명할 수 있다. 결정체이동기구, 원자이동기구 그리고 이 두가지 기구의 조합으로 설명할 수 있다.
The sintering behaviors of the nickel model catalysts supported on γ-alumina were studied under wet hydrogen atmosphere as a function of sintering time and temperature. Two types of initial crystallite size distribution, i.e., the aggregated and the uniformly dispersed, could be obtained by controlling the sputtering conditions. The same region of a specimen was examined with a transmission electron microscope after each heat treatment to follow the change of each nickel crystallite. The surface of nickel crystallite was believed to be in the oxide state as observed by the electron spectroscope for chemical analysis. The various events which had occurred during the first one hour were identified, and they could be explained by applying all the possible sintering mechanisms, i.e., the crystallite migration, the atomic migration and the combination of the two.

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