One‐Pot Synthesis of Potassium‐Functionalized Mesoporous γ‐Alumina: A Solid Superbase

Abstract

Basically super: Potassium‐functionalized mesoporous γ‐alumina solid superbases that have a high base strength (H−) of 27.0, a well‐expressed mesoporous structure, and which are efficient in the isomerization of 1‐hexene are synthesized by a one‐pot method. The success of this method can be ascribed to the flexible application of K2CO3 as a pH adjustor and close control of the calcination process (see picture).

Generating Basic Sites on Zeolite Y by Potassium Species Modification: Effect of Base Precursor

“…Figure 3 shows the IR spectra of KNO 3 -Y treated at different conditions. The bands at 1,385 and 830 cm -1 observed on the as-prepared KNO 3 -Y sample can be assigned to nitrate anion (curve a1) [20]. These IR bands nearly kept constant after the sample was activated at 600°C (curve a2).…”

“…The spectra were collected with 2 cm -1 resolution. The strength of the basic sites was measured by titration in cyclohexane using a series of Hammett indicators [20]. The samples were activated at 600°C in a flow of N 2 (30 mL min -1 ) for 2 h before measurement.…”

Physical Deposition Assisted Colloidal Lithography: A Technique to Ordered Micro/Nanostructured Arrays

“…However, besides the crystal phase, other factors, including the specific surface area, crystal composition, material microstructures, and the absence of exotic species from the remnant starting materials, also significantly affect the catalytic performance. [113][114][115][116] In this case, the special hierarchical structures of the amorphous hncp alumina array have porous structures and possess a much higher specific surface area than the dense alumina film, which, together with the pure compositions, contributes to better catalytic properties.…”

Novel MgO–SnO2 Solid Superbase as a High-Efficiency Catalyst for One-Pot Solvent-Free Synthesis of Polyfunctionalized 4H-pyran Derivatives

“…In the development of environment-benign processes, they are used as catalysts so that reactions can be conducted under mild conditions and without generation of much waste [1][2][3]. In the past two decades, there were many reports on solid superbases such as NaN 3 /c-Al 2 O 3 [4], Na/NaOH/c-Al 2 O 3 [5], K/MgO [6], Eu 2 O 3 /c-Al 2 O 3 [7], KNO 3 /c-Al 2 O 3 [8], KNO 3 /ZrO 2 [9], KOH/ZrO 2 [10], KF/c-Al 2 O 3 [11], and Ca(NO 3 ) 2 /SBA-15 [12]. Recently, we found that the solid superbases Na 2 SnO 3 [13,14] and KOH/La 2 O 3 -MgO [15] showed excellent catalytic efficiency towards some organic reactions at room temperature (RT).…”