294results about How to "Stable structure and performance" patented technology

The invention relates to a tin-containing molecular sieve catalyst used for preparing ethylene glycol by hydrating ethylene oxide and an application method of the tin-containing molecular sieve catalyst. The tin-containing molecular sieve catalyst is prepared by taking H-SSZ-13 zeolite molecular sieve raw powder as a raw material, carrying out water steam treatment or water steam and acid combined treatment on the raw material, and introducing active central metal in a manner of roasting by a vacuum pipe type furnace. The preparation method comprises the following steps: mixing an H-SSZ-13 zeolite molecular sieve treated by the water steam or acid with an organic metal compound precursor at a ratio and roasting in vacuum. According to the tin-containing molecular sieve catalyst, the problems of high water ratio, high energy consumption, environmental pollution caused in a production process and the like in a traditional process can be solved. According to the catalyst, a carrier is cheap and easy to obtain, a preparation process of the catalyst is simple and the stability of the catalyst is good; and the catalyst has excellent catalyzing activity and selectivity when being applied to a process of preparing ethylene glycol by directly hydrating ethylene oxide under a warm condition, is easy to recycle and can be used for industrial production for preparing ethylene glycol by hydrating ethylene oxide.

The invention discloses a silicon-based negative electrode material of a lithium ion battery, a preparation method of the silicon-based negative electrode material, and a battery. The silicon-based negative electrode material is prepared by the compounding of 90wt%-99.9wt% of a silicon-based material and 0.1wt%-10wt% of carbon nano tubes and / or carbon nano fibers which grow on the surface of the silicon-based material in situ. The silicon-based material is a powder material containing electrochemical active silicon and comprises one or a mixture of more of a nano silicon-carbon composite material, a silicon monoxide material, a modified silicon monoxide material and an amorphous silicon alloy, wherein the electrochemical active silicon accounts for 0.1 wt%-90wt% of the silicon-based material. The carbon nano tubes comprise a single-walled carbon nano tube and / or a multi-walled carbon nano tube; the diameter of the carbon nanotubes and / or carbon nanofibers is 0.4-50nm, the length is 10nm-50 microns. The Raman spectrum of the silicon-based negative electrode material of the lithium ion battery has an amorphous bump at 475+ / -10cm<-1>, and / or has crystalline peak at 510+ / -10cm<-1>. When the single-walled carbon nanotube is included, there is an RBM in the range of 100-400cm<-1>. The XRD spectrum of the silicon-based negative electrode material of the lithium ion battery has a diffraction peak at 28.4 degrees + / -0.2 degrees.