48results about How to "Does not affect diffusion" patented technology

The invention discloses a fuel cell interior humidity-current density distribution measurement male tab, and the fuel cell interior humidity-current density distribution measurement male tab is a device for measuring fuel cell interior humidity distribution and electric current distribution, wherein a conductive substrate is provided with a leak and a tendon which correspond to a fuel cell flow field plate runner and a ridge, and a humidity-electric current density jointed measurement sensor is arranged on the tendon; the humidity-electric current density measurement sensor is manufactured by a vacuum evaporation coating method, and comprises seven layers of thin films. The vacuum evaporation coating method is adopted for manufacturing a leading wire used for transmitting an electric signal, and the leading wire extends to the edge of a flow field plate and then is enlarged to form a pin, so that the leading wire is conveniently connected with external data acquisition equipment. Synchronous on-line measurement of fuel cell interior humidity distribution and current density distribution is realized, the fuel cell interior humidity-current density distribution measurement male tab is independently arranged on a fuel cell, special remolding for the structure of the fuel cell is not needed, the fuel cell interior humidity-current density distribution measurement male tab is simple in structure, convenient in manufacturing and wide in application range, and is adaptive to a fuel cell flow field plate with a parallel runner, a snakelike runner, a stagger-type runner and other runner shapes.

The invention discloses a device and a method for reducing the toxic effect of SO2 on an SCR (selective catalytic reduction) catalyst and belongs to the technical field of coal-fired flue gas denitrification. The device comprises a porous reaction container and a molecular sieve membrane, wherein the porous reaction container is made of a porous material and used for containing the SCR catalyst; the molecular sieve membrane covers the outer surface of the porous reaction container, and the pore diameter of the molecular sieve membrane is smaller than the molecular dynamic diameter of SO2 and larger than the molecular dynamic diameters of NH3 and NO. According to the sieving characteristics of a molecular sieve, NO, NH3 and O2 can enter the container and react on the surface of the SCR catalyst to generate N2 and H2O, generated N2 can flow out of an opening end of the container, but no SO2 or only a little SO2 can enter the container through reflux, and accordingly, the toxic effect of SO2 on the SCR catalyst is greatly reduced.

The invention discloses a modified ZSM-5 catalyst for alkylation reactions, a preparation method and applications thereof, and a p-xylene preparation method. The modified ZSM-5 catalyst comprises a ZSM-5 molecular sieve core and an all-silicon molecular sieve shell formed on the outer surface of the core, wherein the pore channels of the shell are communicated to the pore channels of the core so as not to cover the pore channels of the ZSM-5 molecular sieve core by the all-silicon molecular sieve shell, the all-silicon molecular sieve shell has shape-selective effects on alkylation reactions and does not have reaction activity, a molar ratio of Si to Al in the ZSM-5 molecular sieve core is 100-500:1, and the all-silicon molecular sieve shell is formed by reducing the concentrations of a silicon source and a template agent through epitaxial growth. According to the present invention, the catalyst can operate at a high toluene concentration and high space velocity to obtain the high yield of p-xylene, and is suitable for large-scale production and industrial scale application.