Hydrophilicity Modification of MCM-41 With Zirconia and Supported Ruthenium-Lanthanum for Benzene Hydrogenation to Cyclohexene

Abstract

Zirconia modified mesoporous molecular sieve MCM-41 supports were prepared by hydrothermal synthesis method, in situ synthesis method and precipitation method. Ruthenium and lanthanum supported on MCM-41 and zirconia modified MCM-41 catalysts were prepared via two solvents impregnation method. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, nitrogen adsorption-desorption, and water/benzene static adsorptions techniques. It has been found that Ru-La supported on MCM-41 modified with zirconia by hydrothermal synthesis method (Ru-La/ZrO 2 -MCM-41-HS) leads to the biggest increase of the hydrophilicity. Ru-La/ZrO 2 -MCM-41-HS catalyst with the highest hydrophilicity shows the best performance in liquid phase hydrogenation of benzene to cyclohexene.

Influence of Preparation Conditions on the Structure of MCM-41 and Catalytic Performance of Ru/MCM-41 in Benzene Hydrogenation

“…Ru-La supported on zirconia modified MCM-41 catalysts were prepared and used for benzene hydrogenation in our previous work. 33 The results show that the cyclohexene selectivity increases to a certain degree with the hydrophilic modification of zirconia to MCM-41 and the improvement of ruthenium dispersion. However, the interaction between ruthenium and the ordered mesoporous structure of MCM-41 has not been discussed in depth.…”

Partial Hydrogenation of Benzene to Cyclohexene over Ru‐Zn/MCM‐41

“…Ru has been found to be the most efficient catalyst for this process. To improve cyclohexene selectivity, the addition of a second element to the Ru-based catalyst, such as Zn [1,3,6,9,13,21,25,29,30], Co [4,16], Ce [20], Ba [19], Fe [17], La [2,5,9,33], B [7,8,28,35], and Cu [24], is needed. Among these additives, Zn is the most popular, and to date the only industrialized production process for cyclohexene via the partial hydrogenation of benzene, developed by Asahi Chemical Industry Co., employs the Ru-Zn catalyst.…”