Heterogene Katalyse. In ihrer Zuschrift (e202207777) nutzen Patrick Hemberger et al. PEPICO-Spektroskopie zur Identifizierung von Keten- und Methylketen-Intermediaten in der Methylacetat-Umwandlung über HZSM-5-Zeolith.

Introduction Phenol is an important chemical in industry but has been produced from benzene by the three-steps of cumene process. Direct phenol synthesis from benzene is one of the important subjects. However, no selective catalyst with good performance in an economically and environmentally favourable benzene-O2 system has been discovered to date. We have found Re/HZSM-5 promoted the direct ph...

Solid (heterogeneous) catalysts (1–4) are favored in industrial processes because they eliminate the need to separate the catalyst from the products. Heterogeneous catalysts can be solid acids, bases, supported metals, mixed metal oxides, or multifunctional materials. Commercial processes based on solid acids outnumber all others, and zeolites (and closely related materials) are usually the sol...

A series of CuO-ZnO-Al2O3 nanoparticles over HZSM-5 were successfully prepared using different methods of batch co-precipitation, semibatch co-precipitation and combined co-precipitation-ultrasound. Nitrates of copper, zinc and aluminum were used as precursors, while Na-ZSM-5 was employed as composite support and sodium carbonate was used as precipitant agent. The effects of preparation methods...

Pt/Zr(x)-HMS/HZSM-5 catalysts with different ratios of Silicium/Zirconium (denoted as x) were studied for normal heptane reforming at 350-450 °C temperature range. For this purpose, the properties of the catalysts such as X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy, Ultraviolet–visible diffuse reflectance spectroscopy, NH3-temperature pro...

Summary Molybdenum supported on zeolite HZSM-5 is the most studied catalyst for methane dehydroaromatization. However, nature of its catalytic sites and their deactivation mechanisms remain unclear controversial. Here, we report further insights into this system: first, crystal size determines form location active MoCx species, thus performance; second, are preferentially deactivated over acid ...

Due to crude oil is limited, new resources for fuel and petrochemicals are important to be developed. Biogas or NG (Natural Gas) can be easily converted into methanol which can be reacted over zeolite to produce olefins and gasoline. HZSM-5 zeolite catalyst has been used in this study and its modification by (0.5wt%, 1wt%, 2wt% and 4wt %) Ni to convert methanol to hydrocarbons (MTH). Catalysts ...