Chemistry of Inorganic Materials最新文献

Catalysis is the vertebra of most of commercial processes, which utilizes chemical reactions to transform reagents into value added chemicals. Biodiesel synthesis from animal fats and edible vegetable oils via transesterification over homogeneous catalysts is recently taken into account of untenable by the emerging biofuel industries, particularly by virtue of food vs. fuel counteraction, economic and environmental challenges blended with the feedstocks as well as catalytic systems, respectively. Therefore, present efforts concern with the preparation of a novel PTSA-Si catalyst and its relevance for biodiesel synthesis from non-food castor oil. It has been manifested from the experimental outcomes, the most relevant reaction parameters are, 5% PTSA-Si (w/w), 65 ​°C reaction temperature, 1:11 O:M molar ratio and 10 ​h reaction time for 98.56% biodiesel yield. The PTSA-Si was appropriately analyzed using FT-IR, SEM, XRD, BET, TGA-DTA and TPD-NH₃ analysis. Since, castor oil and castor biodiesel were analyzed using FT-IR, ¹H &¹³C NMR analysis. Besides, biodiesel physico-chemical properties were predicted and associated with ASTM fuel standards.

CO₂ hydrogenation to yield long-chain hydrocarbons has attracted tremendous attention in both academic and industrial field. CuFe-based bimetal catalysts have been widely applied in CO₂ hydrogenation owing to their low cost, facile preparation, and excellent performance. In this study, a series of CuFe-based catalysts with different Cu/Fe molar ratios have been synthesized from layered double hydroxide precursor. The optimized CuFe₈-LDO catalyst with Cu:Fe=1:8 exhibits a C₅₊ selectivity of 45% at CO₂ conversion of 9.5%. Through systematic characterizations including TEM, TPR, TPD, XPS, it is revealed the abundant and highly dispersed CuO favors the reduction of iron species, and enhances CO adsorption capacity of as-prepared catalysts. This study provides an in-deep understanding of Cu on CO₂ hydrogenation performance of Fe-based catalysts.

A new series of pincer type ruthenium(II) Schiff base complexes namely [Ru(CO)(PPh₃)₂(L_1‒6)] (1–6) (where, L_1‒6 ​= ​NOO ‒ donors of tri-dentate ligands) have been synthesized from ruthenium precursor such as [RuHCl(CO)(PPh₃)₃] containing tri-dentate Schiff bases ligands (H₂L₁‒H₂L₆). These ruthenium complexes were analyzed by elemental analysis and diverse characterizations such as FT‒IR, UV–Vis and NMR (¹H and ³¹P) spectroscopy studies. The crystal structure of one of the complexes 5 ([Ru(CO)(PPh₃)₂L₅]) was determined by single crystal X‒ray crystallography that revealed pincer type of coordination mode of complexes. Furthermore, complexes 1–6 have been utilized for transfer hydrogenation of aromatic ketones to secondary alcohols in the presence of i‒PrOH/KOH. The catalytic efficiency of complexes showed an efficient for transfer hydrogenation of ketones with alcohol as moderate to high conversions.

The energy bands and band gaps of Cu₂NiXS₄ (X ​= ​Sn, Ge, Si) semiconductor materials have been studied and analyzed by using quantum-chemical calculations within the DFT framework. Using different exchange-correlation functionals, the energy gaps of the studied systems were estimated and determined, and their band structure were studied in detail. Based on the results of spin-polarized and spin-orbit mBJ-calculations, bands of t2g states and direct band gaps with values of 1.32, 1.56, and 2.58 ​ eV, were found for Cu₂NiSnS₄, Cu₂NiGeS₄, and Cu₂NiSiS₄, respectively, indicating the suitability of these materials as a suitable light-absorbing layer for a new generation solar cells.

The photo degradation of Congo red (CR) with TiO₂ and TiO₂ doped with Pd was investigated. The TiO₂ and Pd doped TiO₂ nanoparticles were created through solution combustion with glycine as the fuel, and their band gap was determined using UV absorption spectroscopy. All experiments were conducted in natural Sunlight and UV light. Both nanoparticles degraded rapidly at 20 ​ppm dye concentration and 0.1 ​g/1000 ​ml catalyst concentration. It demonstrates that synthesized TiO₂ and Pd doped TiO₂ nanoparticles can degrade Congo red in an aqueous solution.