Significant promotion of reducing treatment on Pd/TS-1 zeolite for formaldehyde catalytic purification at ambient temperature

Tunable Interfacial Electronic Pd–Si Interaction Boosts Catalysis via Accelerating O2 and H2O Activation

“…The Fourier transform infrared (FT-IR) spectroscopy spectra (Figure S12) showed characteristic peaks of the Si–OH–Al group (3679 cm –1 ), surface physisorbed water (3324 cm –1 ), , Si–O bonds (between 1600 and 650 cm –1 ), Si–O–T bonds (1215 and 1075 cm –1 ), Si–OH bond (921 cm –1 ), and [SiO 4 ] units (814 cm –1 ). , Interestingly, a red shift is observed from 1364 to 1334 cm –1 (Si–O stretching vibration) for Pd@SiO 2 /ZSM-5-20 and Pd@SiO 2 /ZSM-5-30. This shift was attributed to the appropriate introduction of the SiO 2 overlayer, which improves the EMSI between Pd and SiO 2 .…”

“…Therefore, the positive reduction peaks at 28–150 °C are assigned to the reduction of Pd 2+ to Pd 0 ( Figure S19 ), while the negative reduction peaks at 40–100 °C could be attributed to the decomposition of PdH x . 36 , 50 The peaks at 200–350 and 350–500 °C corresponded to the reduction of small and large PdO x particles, respectively. 36 In particular, Pd@SiO 2 /ZSM-5-20 exhibited the lowest reduction peak (Pd 2+ to Pd 0 ) and decomposition peak (PdH x ), indicating optimal reducibility of Pd@SiO 2 /ZSM-5-20 compared to the other three samples.…”

“… 36 , 50 The peaks at 200–350 and 350–500 °C corresponded to the reduction of small and large PdO x particles, respectively. 36 In particular, Pd@SiO 2 /ZSM-5-20 exhibited the lowest reduction peak (Pd 2+ to Pd 0 ) and decomposition peak (PdH x ), indicating optimal reducibility of Pd@SiO 2 /ZSM-5-20 compared to the other three samples. The CO pulse chemisorption test was further performed to study the metal Pd dispersion and CO uptake.…”

Aromatic compounds‐mediated synthesis of anatase‐free hierarchical TS‐1 zeolite: Exploring design strategies via machine learning and enhanced catalytic performance

“…TS‐WAC‐48h, TS‐BDC‐48h and TS‐DABDC‐48h show similar peaks at 390, 516 and 637 cm −1 , indicating the existence of anatase TiO 2 in these samples. [ 47,48 ] Conforming to the UV‐Vis results, TS‐DHBDC‐48h exhibits no characteristic peaks of anatase TiO 2 . The peak at 380 cm −1 is the characteristic of silicate‐1 zeolites, and the peaks at 960 and 1125 cm −1 are ascribed to the Ti‐O‐Si groups in the framework [ 47 ] The intensity of the characteristic peak at 960 cm −1 in TS‐WAC‐48h was significantly weaker than that of aromatic compounds‐mediated zeolites.…”

Catalytic degradation of methyl orange using beta cyclodextrin modified polyvinylidene fluoride mixed matrix membranes imbedded with in‐situ generated palladium nanoparticles

“…However, these metal NPs can be immobilized onto appropriate supports enhancing their recovery, reusability, durability, catalytic efficiency, and cost effectiveness. Different materials such as graphene oxide, [17][18][19] iron oxide, [20][21][22] titanium dioxide, [23][24][25] zeolites, [26][27][28][29] carbon nanotubes, [30][31][32] polymers, [33][34][35][36] chitosan [37][38][39][40] and cellulose [41][42][43][44] have been used as substrates for the immobilization of Pd NPs.…”