Toward redox framework single site zeolite catalysts

Electrochemical reduction of CO2 and N2 to synthesize urea on metal-nitrogen-doped carbon catalysts: a theoretical study

Fossil fuels have been increasingly consumed since the industrial revolution, causing rapid increases in carbon dioxide emissions and disrupting the global carbon cycle. With increasing attention being paid to the harmful effects of carbon dioxide as a "greenhouse gas", its use as a feedstock for basic chemical production is an attractive topic. Nature benefits humans through "crops brought by thunderstorms". Combining these two methods to produce urea containing nitrogen is the focus of this paper. In this paper, a series of catalysts supported on the substituted corrole substrates in the form of a double transition metal are investigated by DFT calculations. The best catalyst was selected and combined with carbon and nitrogen reduction to further explore the catalytic performance of urea synthesis. Based on this study, it was found that the synergistic catalytic strategy of double active sites had broad prospects in urea synthesis, and could also provide new development strategies for the design of other efficient molecular catalysts.

Catalytic Applications of Vanadium: A Mechanistic Perspective

The chemistry of vanadium has seen remarkable activity in the past 50 years. In the present review, reactions catalyzed by homogeneous and supported vanadium complexes from 2008 to 2018 are summarized and discussed. Particular attention is given to mechanistic and kinetics studies of vanadium-catalyzed reactions including oxidations of alkanes, alkenes, arenes, alcohols, aldehydes, ketones, and sulfur species, as well as oxidative C-C and C-O bond cleavage, carbon-carbon bond formation, deoxydehydration, haloperoxidase, cyanation, hydrogenation, dehydrogenation, ring-opening metathesis polymerization, and oxo/imido heterometathesis. Additionally, insights into heterogeneous vanadium catalysis are provided when parallels can be drawn from the homogeneous literature.

Al-free Fe-beta as a robust catalyst for selective reduction of nitric oxide by ammonia

Al-free Fe-beta prepared via a post-synthesis solid-state metallation route is established as an active and durable catalyst for NH₃-SCR.

Fabrication of hierarchically mesoporous CuO nanostructures and their role as heterogenous catalysts and sensors

Tween-80 templated mesoporous CuO (mpCuO) nanostructures were explored via a facile, environmentally friendly and scalable sol–gel route for heterogeneous catalysis and sensor technology.

Highly ordered mesoporous TiO2-Fe2O3 mixed oxide synthesized by sol-gel pathway: an efficient and reusable heterogeneous catalyst for dehalogenation reaction

Highly ordered two-dimensional (2D) hexagonal TiO(2)-Fe(2)O(3) mixed-oxide material MFT-1, which is composed of very tiny nanoparticles, is synthesized using sodium dodecylsulfate (SDS) as a structure-directing agent. Interestingly, synthesis of an ordered mesophase was not possible using SDS as a template for mesoporous pure Fe(2)O(3) or TiO(2) phases. This mesoporous iron-titanium mixed-oxide material has been characterized by powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), N(2) sorption, ultraviolet-visible light diffuse reflectance spectroscopy (UV-vis DRS) studies. N(2) sorption analysis revealed high surface areas (126-385 m(2) g(-1)) and narrow pore size distributions (3.1-3.4 nm) for different samples. UV-vis DRS spectra and wide-angle powder XRD patterns indicate that the material is composed of α-Fe(2)O(3) and anatase TiO(2) phases. This TiO(2)-Fe(2)O(3) mixed-oxide material can act as a very efficient and reusable catalyst in the dehalogenation of aromatic chloride-, bromide-, and iodide-tolerating -F, -CN, -CH(3), -OCH(3) and -NO(2) functional groups in the aromatic ring using 2-propanol as the dispersion medium.