Ionic Liquid Templated Synthesis of Hexagonal (IITM-41) and Cubic (IITM-48) Ordered Mesoporous Silicates

Physicochemical Properties of Long Chain Alkylated Imidazolium Based Chloride and Bis(trifluoromethanesulfonyl)imide Ionic Liquids

“…Long alkyl chain imidazolium ILs have a high degree of self-organization, which increases with the increasing chain length. They display the behavior of both lyotropic and thermotropic crystals. , Recently, the advantages of long hydrocarbon tails as amphiphilic head in the preparation of ordered self-organized structures have received further attention. − In petroleum science long alkyl chain ionic liquids with surface active properties are used as surfactants in enhanced oil recovery. − Besides, 1-decyl-3-methylimidazolium tetrafluoroborate in oxidative desulfurization of diesel exhibited high catalytic activity for the removal of dibenzothiophene in diesel . 1-Alkyl-3-methylimidazolium hydrogen sulfate (C6–C14) ILs are also applied as surfactants with catalytic activities, as the authors found that “the co-catalytic properties, both conversion and selectivity, of alkylimidazolium hydrogen sulfate ionic liquids noticeably depended on the alkyl chain lengths, and as a of consequence their properties” .…”

Ionic liquid templated synthesis of cobalt‐substituted mesoporous aluminophosphates: A novel heterogeneous catalyst for selective oxidation of cyclohexane to cyclohexanol

“…These compounds are, normally, liquids with low melting points and negligible vapour pressure [27] . Recently, a long‐chain ionic liquid, viz., HDmimCl, was used as a surfactant to synthesize ordered mesoporous silicates and aluminosilicates with improved textural properties compared to conventionally used surfactants [18,19] . This class is characterized by imidazolium cations featuring N‐alkyl chains exceeding C8 in length, paired with counter anions of either inorganic or organic origin, and possessing a melting point below 100 °C.…”

“…This lower activity was mainly attributed to poor dispersion of the active metals onto the lower surface of the support matrix. On the other hand, ordered mesoporous materials such as MCM‐41, IITM‐41, IITM‐56, SBA‐15, etc [15–18] . provide high surface area and much better dispersion of metal nanoparticles owing to their large external surface area and huge pore volume as well as better diffusion of products through the mesopores.…”

“…Therefore, it is still a challenge to achieve a high selectivity of cyclohexanol at maximum cyclohexane conversion. In this regard, we report here a novel ionic liquid templated cobalt‐substituted ordered hexagonal mesoporous iron phosphate, designated as CoMAP‐41, synthesized employing a long chain, 1‐hexadecyl‐3‐methyl imidazolium chloride (HDmimCl) ionic liquid as the structure‐directing agent [17–18,25] . Further, its applicability as an effective catalyst for the oxidation of cyclohexane reaction under mild reaction conditions using H 2 O 2 as an oxidant is evaluated.…”

Ionic Liquid Templated Ordered Hexagonal Mesoporous Iron Phosphate Molecular Sieves: A Highly Effective Heterogeneous Catalysts with Remarkable Selectivity for Phenol Hydroxylation Reaction

“…[1][2][3] However, these materials possess thin wall structure and therefore poor thermal and hydrothermal stabilities of the materials. Several attempts have been made to improve the physico-chemical properties of mesoporous silicates and aluminosilicates by using long-chain ionic liquids, viz., 1-alkyl-3-methylimidazolium cations ([C n mim] + ; n = 2-18), as templates, in particular, 1-hexadecyl-3methyl imidazolium chloride (HDmimCl or C 16 mimCl) ionic liquid [16][17][18][19] . On the other hand, there were no reports on the synthesize of mesoporous iron phosphates using HDmimCl as the structure directing agent.…”