Citation: XU Da, LIU Shi-Yan, LIU Yun-Ling, WANG Zhen-Lü. Effect of pH Value on the Properties of Molybdenum-Based Multiphasic Oxide Catalysts in Selective Oxidation of Isobutene to Methacrolein[J]. Acta Physico-Chimica Sinica, ;2012, 28(11): 2690-2696. doi: 10.3866/PKU.WHXB201208282 shu

Effect of pH Value on the Properties of Molybdenum-Based Multiphasic Oxide Catalysts in Selective Oxidation of Isobutene to Methacrolein

1.
1 Key Laboratory of Surface and Interface Chemistry of Jilin Province, College of Chemistry, Jilin University, Changchun 130021, P. R. China;
2 State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130021, P. R. China

Received Date: 21 June 2012
Available Online: 28 August 2012
Fund Project: 无机合成与制备化学国家重点实验室开放课题(2012-15) (2012-15)吉林大学科学前沿与交叉学科创新项目(2012)资助 (2012)

The effect of different pH values on Mo-Bi-Fe-Co-Mn multiphasic oxide catalysts prepared via co-precipitation methods was studied. In addition, selective oxidation of isobutylene to methacrolein (MAL) reaction was evaluated. The structures and crystal phases of the catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), N₂ adsorption-desorption, and temperature-programmed reduction of H₂ (H₂-TPR). The characterization results showed that the structures and properties depended on the pH during preparation. The amount of the special crystalline phase MX on the catalysts increased with increasing pH value during the preparation process. When the precipitation pH value was 7, the crystalline phase MX reached maximum levels on the corresponding sample. The conversion of isobutene and selectivity for methacrolein were 99.9% and 95.6%, respectively. When increasing the precipitation pH, the MX content decreased, and the conversion of isobutene and selectivity for methacrolein decreased. The results revealed that synergistic effects or cooperation between multiphasic oxides and the special phase MX might be important for improving catalytic performance.
- Molybdenum,
- Multiphasic oxides,
- pH value,
- Isobutene,
- Oxidation
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