Effect of precipitants on Ni-CeO2 catalysts prepared by a co-precipitation method for the reverse water-gas shift reaction

• Published in: Journal of rare earths Vol. 31; no. 10; pp. 969 - 974
• Main Authors: WANG, Luhui, LIU, Hui, LIU, Yuan, CHEN, Ying, YANG, Shuqing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2013
• Subjects: co-precipitation; Ni-CeO2 catalyst; oxygen vacancy; precipitant; rare earths; reverse water-gas shift reaction; X-射线衍射; 二氧化; 共沉淀法; 制备; 反向; 氢氧化钠; 水煤气变换反应; 铈催化剂; co-precipitation; Ni-CeO2 catalyst; precipitant; oxygen vacancy; reverse water-gas shift reaction; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(13)60014-9

A series of Ni-CeO2 catalysts were prepared by co-precipitation method with Na2CO3, NaOH, and mixed precipitant （Na2CO3：NaOH; 1：1 ratio） as precipitant, respectively. The effect of the precipitants on the catalytic performance, physical and chemical properties of Ni-CeO2 catalysts was investigated with the aid of X-ray diffraction （XRD）, Bmmaner-Emmett-Teller method （BET）, Fou- rier-transform infrared spectroscopy （FT-IR）, thermogravimetry （TG）, and H2-TPR characterizations. The Ni-CeO2 catalysts were exam- ined with respect to their catalytic performance for the reverse water-gas shift reaction, and their catalytic activities were ranked as： Ni-CeO2-CP （Na2CO3：NaOH=I：I）〉Ni-CeO2-CP（Na2CO3）〉Ni-CeO2-CP（NaOH）- Correlating to the characteristic results, it was found that the catalyst prepared by co-precipitation with mixed precipitant （Na2CO3：NaOH; 1：1 ratio） as precipitant hadthe most amount of oxygen vacancies accompanied with highly dispersed Ni particles, which made the corresponding Ni-CeO2-CP（Na2CO3：NaOH=I： 1） catalyst exhibit the highest catalytic activity. While the precipitant of Na2CO3 or NaOH resulted in less or no oxygen vacancies in Ni-CeO2 catalysts. As a result, Ni-CeO2-CP（Na2CO3） and Ni-CeO2-CP（NaOH） catalysts presented poor catalytic performance.