Stability of MCM-41-Supported CoMo Hydrotreating Catalysts

Chromium Species as Captors of Sulfur Molecules on Nickel-Based Hydrotreating Catalysts

“…A material with a high specific surface and a sizable pore diameter together with proper acidic functions has been the main goal of many researchers in this area. To date, the discovery of MCM-41 mesoporous silica has proven to be the material of choice. − However, their poor thermal stability has posed serious limitations on their practical applications. , New mesoporous silica-type materials have been developed in recent years, intending to optimize the synthesis methods to obtain mesoporous supports similar to MCM-41. So far, it seems that SBA-15 is the best candidate to replace MCM-41, so long as one can minimize the limitations found when thermal and hydrothermal stability are considered but retain the advantages of the materials that they intend to replace .…”

SBA-15 supports modified by Ti and Zr grafting for NiMo hydrodesulfurization catalysts

“…It was found that zirconium improves hydrogenation activities of the samples. However, the MCM-41 and HMS type materials have poor stability [28,29] and relatively small pores (about 20-35 Å diameter), which can be easily blocked by HDS active phases [27]. These disadvantages represent a serious limitation to the practical applications of MCM-41 or HMS-based formulations.…”

Controllable Synthesis of Spherical Al-SBA-16 Mesoporous Materials with Different Crystal Sizes and Its High Isomerization Performance for Hydrodesulfurization of Dibenzothiophene and 4,6-Dimethyldibenzothiophene

“…One of the most important topics is the design of HDS catalytic materials . Alumina is considered as the typical support material in the industrial processes due to its low cost, good properties, and ease of synthesis. , However, there are also some drawbacks, mainly related to the presence of undesired metal–support interactions, which severely restricts the formation of NiMoS-II active phases. , To overcome the aforementioned disadvantages of commercial support and realize the ultradeep HDS, different supports like MCM-41, , HMS, , KIT-6, , and SBA-15 , have been used in HDS reactions. However, these one- or two-dimensional supports cannot provide more space for reactant and product molecules to diffuse in and out .…”

“…19,20 However, there are also some drawbacks, mainly related to the presence of undesired metal−support interactions, which severely restricts the formation of NiMoS-II active phases. 21,22 To overcome the aforementioned disadvantages of commercial support and realize the ultradeep HDS, different supports like MCM-41, 23,24 HMS, 25,26 KIT-6, 27,28 and SBA-15 29,30 have been used in HDS reactions. However, these one-or two-dimensional supports cannot provide more space for reactant and product molecules to diffuse in and out.…”