Showing papers by "Weizhong Qian published in 2017"
TL;DR: In this article, a general seed-induced strategy for the synthesis of meso/macroporous ZSM-5 and ZSM11 under additive-free, low template/SiO2 ratio (from 0.011 to 0.0014) and seed-assisted hydrothermal conditions was reported.
26 citations
TL;DR: In this article, the absorption and desorption performance of xylene with graphene-carbon nanotube hybrids (GNHs) was reported, and it was shown that the adsorption-desorption ability of the GNHs decreased only slightly after the reversible operation of 30 cycles.
15 citations
TL;DR: In this article, nano ZSM-12 zeolite, with a huge external surface area and lower ratio of Bronsted to Lewis acids, exhibited high activity and selectivity for the direct transformation of methanol into multi-methylbenzenes.
Abstract: Nano ZSM-12 zeolite, with a huge external surface area and lower ratio of Bronsted to Lewis acids, exhibited high activity and selectivity for the direct transformation of methanol into multi-methylbenzenes with molecule sizes that were larger than the 1-D pore of ZSM-12, via the production of xylene inside the pore and complete external surface methylation.
15 citations
TL;DR: In this article, the boundary between uniform and non-uniform fluidization can be detected by stability analysis based on Prigogine's minimum of entropy production principle, and this criterion for N parallel paths can be simplified into calculating the second derivative of pressure drop through one path with respect of total solids pressure loading.
13 citations
TL;DR: In this article, Feox/ZSM-5 was used to suppress the isomerization of xylene and hydrogen transfer from propylene to propane on the external surface.
Abstract: Herein, FeOx-supported ZSM-5 exhibited excellent catalytic performance in the aromatization of methanol, similar to ZnOx-supported ZSM-5 but with much longer life time. Coating of FeOx/ZSM-5 catalyst with a SiO2 shell is effective to suppress the isomerization of xylene and hydrogen transfer from propylene to propane on the external surface. As a result, FeOx/ZSM-5@SiO2 exhibited gross yield of C2–C3 olefins and para-xylene (carbon base) far higher than that of HZSM-5, ZnOx/ZSM-5, and ZnOx/ZSM-5@SiO2.
10 citations
TL;DR: In this article, the influence of gas velocity and bed diameter on temperature and hot spot profile in gas-solid fluidized beds is studied based on a 2D pseudo homogeneous phase model.
Abstract: The influence of gas velocity and bed diameter on temperature and hot spot profile in gas–solid fluidized beds is studied based on a 2D pseudo homogeneous phase model. A dimensionless number, the fluidized Prater number βf, is introduced into fluidized bed reactors to estimate the temperature gradient and hot spot profile based on various operating parameters and a quantitative relationship is established. Contrary to fixed beds, in fluidized beds, with low gas velocity and small bed diameter, there tend to be large temperature gradients and hot spots. With the increase of gas velocity in the turbulent regime and decrease in the bed diameter, βf, the hot spot gradually disappears and the temperature profile tends to be more uniform. The hot spot in highly exothermic reactions in fluidized beds can be effectively minimized by increasing gas velocity in the turbulent regime and enlarging the bed diameter. An operating map for the industrial hydrogenation of nitrobenzene reaction is provided to estimate the possible axial temperature gradient from operating parameters. This method can be applied to other similar reactions for selecting operating parameters and methods to eliminate hot spots and produce a uniform temperature gradient.
4 citations
Patent•
15 Sep 2017
TL;DR: In this article, a lithium-ion battery is provided with a gas or liquid channel communicating with the outside, wherein the gas channel is externally connected with a valve, used for discharging a gas generated in the battery at regular intervals as a gas channel in normal use, is used for filling the battery with a solvent, fully mixing with an internal electrode material and an electrolyte and drawing out the mixture as a liquid channel when dismantled and recovered.
Abstract: The invention discloses a lithium-ion battery convenient-to-dismantle and recover A housing of the lithium-ion battery is provided with a gas or liquid channel communicating with the outside, wherein the gas or liquid channel is externally connected with a valve, is used for discharging a gas generated in the lithium-ion battery at regular intervals as a gas channel in normal use, is used for filling the lithium-ion battery with a solvent, fully mixing with an internal electrode material and an electrolyte and drawing out the mixture as a liquid channel when dismantled and recovered The invention further discloses a preparation method of the lithium-ion battery An adhesive is not used, so that an electrode and a current collector are molded in a tight contact manner Meanwhile, the invention further discloses a dismantling and recovering method of the lithium-ion battery The method comprises the following steps: injecting the solvent through the liquid channel on the housing, mixing with the electrode material and the electrolyte and drawing out the mixture from the lithium-ion battery According to the method, the recovery rate of the electrode material, the electrolyte and a diaphragm is greater than 98%, and the method has the advantages of being low in recovery cost, safe and environment-friendly