Novel method for the preparation of Cs-containing FAU(Y) catalysts for aniline methylation

Toward Excellent Na+ Poisoning Resistance of Fe2O3/HY: The SiO2/Al2O3 Ratio of Zeolite Strongly Matters

“…The spectrum of the sample only exhibits one single peak centered at −5 parts per million (ppm) chemical shift (referenced to 1 mol L –1 of NaCl solution). This characteristic 23 Na-NMR peak is assigned to Na + cations in SI positions at the double 6-ring pores . No NMR peaks assigned to Na + ions in SI′, SII′, SII, or SIII positions were detected, indicating that only the protons at double 6-ring pores underwent the exchange of H + for foreign Na poisons .…”

“…This characteristic 23 Na-NMR peak is assigned to Na + cations in SI positions at the double 6-ring pores. 16 No NMR peaks assigned to Na + ions in SI′, SII′, SII, or SIII positions were detected, indicating that only the protons at double 6-ring pores underwent the exchange of H + for foreign Na poisons. 29 Therefore, NMR evidence supports the idea that not all acid sites of HY zeolite take part in protecting surface active sites upon Na + poisoning.…”

“…This finding indicates that only a portion of the H + acid sites takes part in the ion-exchange process with foreign Na + . Not all acid sites are accessible to Na + ions, and this occurs when the H + sites are located at less-exchangeable sites in the internal channels of the HY support. − …”

Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

“…As the zeolites exhibited effective catalytic activity to the methylation reaction of some aromatic amines [16,17,[22][23][24], several different zeolites such as H , H-ZSM-5, NaX, NaY, and MCM-41 were chosen to catalyze the reaction of MDA with DMC in order to obtain MBDMA, as shown in Table 1. Disparate catalytic performances were observed.…”