Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

Abstract

Experimental evidence for Pd‐based structure modification of electrocatalysts with hydrogen during their chemical synthesis is still missing. Therefore, in situ X‐ray diffraction (XRD) techniques were as used to investigate hydrogen insertion into the lattice of Pd nanomaterials during their preparation. It was shown that the use of NaBH4 as reducing agent led to PdHx whereas L‐ascorbic acid gave Pd nanoparticles. The subsequent influence of hydrogen insertion on the catalytic properties of Pd nanostructures was demonstrated by using carbon monoxide and glucose as probing molecules. High active surface areas and catalytic activities were found for the unmodified Pd nanostructures through electrochemical studies. Notably, the reducing agent has a significant effect on the size distribution of the nanoparticles. Its use can precisely and effectively tune their catalytic properties. Consequently, the remarkable behavior uncovered herein provides new strategic routes that can be used for the preparation of Pd‐based nanomaterials.

Catalytic upgrading of vegetable oils into jet fuels range hydrocarbons using heterogeneous catalysts: A review

“…This factor will also strongly limits any possibility with the biojet fuels-grade paraffins that will require severer conditions due to longer chain lengths. Chloride catalysts are similarly corrosive A c c e p t e d M a n u s c r i p t 19 with disposal difficulties [103] and [104]. Pure, doped or promoted zirconia and heteropoly acid catalysts were also tested [105] and [106].…”

Oxidative Fluorination of Cu/ZnO Methanol Catalysts

“…Theinterest in such fluoride containing heterogeneous catalysts (F-Cats) is increasing, [11][12][13] as the properties of the fluoride vs.t he typically used oxide ion are related but different. With the greatly reduced charge (À1v s. À2) and the smaller ionic radius (131 vs.1 38 pm @c oordination number 4), [14] the fluoride ion has increased mobility in solids and may alter surface charges.MgF 2 [15][16][17] and AlF 3 [12,13,[16][17][18] with high surface areas and tunable [19] up to very high Lewis acidity in HS-AlF 3 , are the best investigated F-Cats [20] used for isomerizations, [21] acylations, [22] Michael additions, [23] but also with noble metals for C=Ch ydrogenations. [18,24] Yet, apart from one report on CO 2 hydrogenation with aN aF modified catalyst [25] we are not aware of F-Cats being used in methanol synthesis.…”

Highly Selective Dehydrochlorination of 1,1,1,2‐Tetrafluoro‐2‐chloropropane to 2,3,3,3‐Tetrafluoropropene over Alkali Metal Fluoride Modified MgO Catalysts

“…The results of NH 3 TPD and CO 2 TPD (Figure and Table S2) also reveal that the fluorinated MgO exhibits weaker acidity/basicity than MgO, but its amounts of acid/base sites are bigger than those of MgO. Furthermore, the pyridine IR spectra (Figure S4) confirm the existence of many Lewis acid sites on the fluorinated MgO, shown by the vibration bands at 1446 and 1606 cm −1 , whereas the MgO possesses very few Lewis acid sites. Wojciechowska et al .…”

“…This result evidences the acidity of MgO was almost lost if the salts of Cs and K were used as the promoters. Furthermore, the IR spectra of adsorbed pyridine (Figure S4) confirmed the presence of both weak Lewis and Brønsted acid sites on the NaCl, ZrO 2 , BaO, and Al 2 O 3 modified MgO, and the pure MgO, shown by the vibration bands at approximately 1490–1500 cm −1 . However, the corresponding intensity of the absorption band was very weak, indicating the acid sites were limited over these catalysts.…”