Differences between Zn/HZSM-5 and Zn/HZSM-11 zeolite catalysts in alkylation of benzene with dimethyl ether

HZSM-11 zeolite supported Zn catalysts with different Zn contents （xZn/HZSM-11A） were prepared. In the alkylation of benzene with dimethyl ether （DME） in a fixed bed reactor, the catalyst with Zn content of 6 wt% （6Zn/HZSM-11A） showed appropriate performance. Focus was put on the comparison between 6Zn/HZSM-5 and 6Zn/HZSM-11 with the same crystal size of 600-800 nm, and also with the similar BET surface area, micropore volume, Si/Al2 molar ratio, and acidity. In the alkylation of benzene with DME, the 6Zn/HZSM-11 showed better activity and stability, and especially enhanced the conversion of benzene and selectivities to xylene and trimethylbenzene, compared with the 6Zn/HZSM-5. This was mainly related to the higher adsorption capacity and adsorption-desorption rates to the three adsorbates （benzene, m-xylene and 1,3,5-trimethylbenzene） over the 6Zn/HZSM-11 in comparison with the 6Zn/HZSM-5.

Bi_(2)S_(3)Nanorods Hosted on rGO Sheets from Pyrolysis of Molecular Precursors for Efficient Li-Ion Storage

Bismuth-based compounds with high capacity and durability are still challenging in Li-ion batteries(LIBs).In this article,Bi_(2)S_(3)nanorods hosted on reduced graphene oxide nanosheets(Bi_(2)S_(3)/rGO,BSG)are successfully prepared using molecular precursor pyrolysis strategy.1D nanorod architecture possesses preeminent kinetic characteristics,shortening the ion diffusion path and increasing the contact area between electrode and electrolyte.The large specific surface area and charge polarization of rGO at the interface promote charge transfer.The capacity of material(BSG-400)reaches 558.4 m Ah g^(-1)at 0.2 A g^(-1)after 200 cycles.The anode properties of the composite outperform those of pristine Bi_(2)S_(3).The introduction of graphene enables the interfacial interaction between rGO and Bi_(2)S_(3).The closely contact interface improves the conductivity and lithium storage performances of Bi_(2)S_(3).The regulatory effect of rGO on the electronic density of states and band gap of Bi_(2)S_(3)has been demonstrated by theoretical calculation.The synthetic approach has the advantages of universality,simple operation procedure,and strong repeatability.This research provides some ideas for the preparation of other metal sulfides/rGO nanomaterials and their application in battery research.