Citation: BI Hui-Zi, DOU Rong-Fei, WANG Hao, PEI Yan, QIAO Ming-Hua, SUN Bin, ZONG Bao-Ning. Effect of the Support on Partial Hydrogenation of Toluene over Ru/Oxide Catalysts[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1765-1774. doi: 10.3866/PKU.WHXB201604085
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The supported Ru catalysts were prepared by the impregnation-chemical reduction method to investigate the effect of some conventional oxide supports (SiO2, m-ZrO2, t-ZrO2, γ-Al2O3, and P25) on the partial hydrogenation of toluene to methylcyclohexenes. The catalysts were characterized by N2 physisorption, powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was found that the supports influenced the size of the Ru nanoparticles (NPs) and consequently the catalytic performance. With the increase in the size of the Ru NPs from 2.6 to 17.3 nm, the turnover frequency (TOF) of toluene and the initial selectivity (S0) to methylcyclohexenes increased first, reached the maximum, and then decreased, following a volcano-like curve. At the Ru particle size of 3.0 nm, both TOF and S0 reached the highest values. Reaction conditions, such as the type and concentration of the modifiers, the temperature, and the pressure, were optimized over the best Ru/P25 catalyst among the supported Ru catalysts investigated herein. Under the reaction conditions of 423 K, H2 pressure of 5.0 MPa, and using 0.25 g zinc sulfate heptahydrate as the modifier, the initial hydrogenation activity (r0) of 26 mmol·g-1·min-1, the S0 of 57%, and the methylcyclohexenes yield of 36% were obtained.
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Keywords:
- Support,
- Ruthenium,
- Toluene,
- Partial hydrogenation,
- Methylcyclohexene
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