Synthesis and catalytic performance of Cs/P modified ZSM-5 zeolite in aldol condensation of methyl acetate with different sources of formaldehyde

Catalytic Upgrading of Lignite Pyrolysis Volatiles over AlF3-Modified HZSM-5 to Light Aromatics: Synergistic Effects of One-Step Dealumination and Realumination

“…The FT-IR spectra of the modified catalysts in Figure reveal that the absorption peaks (548 and 450 cm –1 ) characterizing the characteristic structure of zeolite are unchanged, indicating that their framework structures are not destroyed after modification . Note that the absorption peak near 1224 cm –1 , which is sensitive to the SAR, shifts toward a higher wavenumber, implying that the facile modification method can optimize the SAR.…”

“…The FT-IR spectra of the modified catalysts in Figure 1 reveal that the absorption peaks (548 and 450 cm −1 ) characterizing the characteristic structure of zeolite are unchanged, indicating that their framework structures are not destroyed after modification. 33 Note that the absorption peak near 1224 cm −1 , which is sensitive to the SAR, shifts toward a higher wavenumber, implying that the facile modification method can optimize the SAR. In addition, as shown in the XRD patterns of the catalysts in Figure 2, the AlF 3 -modified HZ5 exhibits typical peaks similar to the original HZ5 at 2θ = 6°−10°and 22°−25°, and no crystal diffraction peaks of AlF 3 are detected.…”

Biobased Cadaverine as a Green Template in the Synthesis of NiO/ZSM-5 Nanocomposites for Removal of Petroleum Asphaltenes: Financial Analysis, Isotherms, and Kinetics Study

“…The IR spectrum indicates that the ZSM-5 has different vibrational bands, for example, at 1234, 1075, 792, 546, and 450 cm –1 . These characteristic bands accurately correspond to the IR absorption bands of the ZSM-5 molecular sieve. − The band around 546 cm –1 represents the presence of a five-membered ring of zeolite ZSM-5 for both samples . The 450 cm –1 band is assigned to the vibrational absorption of the T-O bond in the SiO 4 and AlO 4 tetrahedron, demonstrating the structure of the ZSM-5 sample.…”

Enhanced Catalytic Activity with Oxygen for Methyl Acrylate Production via Cross‐Aldol Condensation Reaction

“…Alkali metal oxides or alkaline earth metal oxides supported catalysts were usually applied as base catalysts. In previous research, the catalyst performance of alkali metal oxide, mainly for Cs, supported γ ‐Al 2 O 3 or ZSM‐5 was discussed for synthesis of MA via aldol condensation of MA with formaldehyde . When the V 2 O 5 ‐P 2 O 5 binary oxide as well as vanadium‐titanium binary phosphates were employed as catalysts for aldol condensation of HCHO with other substances consisting of acetone , acetic acid, and methyl acetate , excellent catalytic activity was stated and all the desired target products were obtained, which convincingly demonstrated that the acid‐base properties of these phosphates catalysts play a vital part in promoting aldol condensations .…”