The production of aromatic hydrocarbons from cellulose by zeolite-catalyzed fast pyrolysis involves a complex reaction network sensitive to the zeolite structure, crystallinity, elemental composition, porosity, and acidity. The interplay of these parameters under the reaction conditions represents a major roadblock that has hampered significant improvement in catalyst design for over a decade. ...

-We have investigated the effects of occupancy and blocked sites on the diffusivity of penetrants in a three-dimensional lattice model of ZSM-5. Using our model, which is a realistic. coarse-grained description of the zeolite, we find that diffusivity decreases more strongly with occupancy and fraction of blocked sites than on a two-dimensional square or three-dimensional cubic lattice. The per...

2H Magic-angle spinning nuclear magnetic resonance (MAS NMR), echo 27Al NMR, two-dimensional (2D) echo 1H MAS NMR and 1H, 27Al and 29Si MAS NMR have been applied to study the acid sites of dehydrated zeolites. The quadrupole coupling constants CQCC determined from 2H MAS NMR spectra of Si-OH-Al sites increase with the framework aluminium content of the zeolites from 208 Hz (H-ZSM-5) to 236 kHz ...

The supplementary data have included a full range of TEM pictures of the post-run samples, including 400 oC calcinated MoO3/H-ZSM-5 samples (coked) and the parent H-ZSM-5 (coked), showing the distribution of Mo clusters on the zeolite crystallite external surface, and the observed coke deposition upon the spreading of the Mo species. The Figures S1-S9 are the complementary of the Fig. 8 in the ...

Cu-SSZ-13 has been characterized by different spectroscopic techniques and compared with Cu-ZSM-5 and Cu-β with similar Si/Al and Cu/Al ratios and prepared by the same ion exchange procedure. On vacuum activated samples, low temperature FTIR spectroscopy allowed us to appreciate a high concentration of reduced copper centres, i.e. isolated Cu(+) ions located in different environments, able to f...

Abstract Dehydroaromatization of methane (MDA) reaction was investigated over platinum modified Mo/H-ZSM-5 catalysts which were pre-carbided at 750 °C. The influence on the catalytic performance and product selectivity for MDA 700 °C studied. presence led to a slight decrease in conversion from 7.5 4.2%. Aromatic selectivities above 90% obtained with containing low loadings (0.5 1.0 wt.%), benz...

In this work, we show for the first time that high-silica zeolites (MFI, TON, MTT, and *MRE) could be synthesized from a combined strategy of both zeolite seeding alcohol filling in absence organic structure-directing agents (OSDAs). High-silica ZSM-5 with Si/Al ratios ranging 38 to 240 (TF-Al-ZSM-5) via route. The key success technique was employment an aluminosilicate precursor fully 4-coordi...

One-dimensional medium-pore zeolites are promising catalysts for propylene production from naphtha cracking due to their high selectivity. However, fast deactivation pore mouth blockage is preventing these being widely used in commercial applications. In this study, we molecular dynamics simulations investigate the diffusion of three one-dimensional aluminosilicate frameworks (ZSM-23, ZSM-22, Z...