본 연구는 Ni/CexZr1-xO2 촉매를 이용하여 프로판의 자열개질반응을 통한 수소제조에 관한 것이다. Ni/CexZr1-xO2 촉매는 용매로서 물을 사용한 방법(CZ-W), 우레아와 물을 사용한 방법(CZ-UW), 우레아, 에탄올 및 물을 사용한 방법 (CZ-UWA)으로 각각 제조하였다. 반응물질의 조성은 Steam/C3H8=3, C3H8/O2=2.70 이었고, 반응은 상압 고정층 유통식 반응기에서 300~700 ℃ 온도범위에서 진행하였다. 촉매제조시 용매에 우레아 및 에탄올을 첨가할 경우 촉매의 활성이 증가하였다. CZ-UW 촉매의 경우 클러스터형태의 탄소생성에 기인한 활성점 피막으로 인해 쉽게 비활성화가 초래됐다. 하지만 CZ-UWA 촉매의 경우 반응 후 탄소가 활성에 영향을 미치지 않는 나노파이버형태로 존재하여 활성저하가 발생되지 않음을 SEM을 통해 확인했다. 또한 Ni/Ce0.75Zr0.25O2 촉매의 전환율 및 수율이 더 좋게 나타났으며 또한 소량의 Cobalt를 첨가했을 때 탄소에 대한 저항성이 크게 향상됨을 TGA로 확인하였다.

In this study, the catalytic performance and characterization of Ni/CexZr1-xO2 were investigated using an autothermal reforming (ATR) process for hydrogen production. The Ni/CexZr1-xO2 catalysts were prepared using the following methods: the water method (CZ-W), urea water method (CZ-UW) and urea, water and ethanol method (CZUWA). The performance of Ni/CexZr1-xO2 catalysts in autothermal reforming of propane for hydrogen production was studied in a fixed-bed flow reactor. Reaction tests were conducted by using a feed of H2O/C3H8/O2=3/1/0.37 and 300~700 ℃. The CZ-UW and CZ-UWA catalysts showed higher propane conversion and hydrogen yield than the CZ-W catalyst. The activity test confirmed that the improvement in the water.ethanol catalyst was due to the low level of carbon deposition. SEM showed that the surface carbon consisted of clusters on the used CZ-UW catalyst, which is incontrast to the nano-fiber morphology observed on the used CZ-UWA catalyst. It was found that the amount of carbon deposition depends on the preparation method. Especially the Ni/Ce0.75Zr0.25O2 was showed higher propane conversion and hydrogen yield than the other catalysts. Also TGA showed that the resistance of carbon deposition increase to Co addition.

Autothermal Reforming Ceria-Zirconia Hydrogen Propane Catalysts

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