64results about How to "No significant decrease in activity" patented technology

The invention relates to an indium-based sulfide composite photocatalyst and a preparation method thereof, and is used for solving the technical problem that the existing trinary indium-based sulfide has low hydrogen yield. The indium-based sulfide composite photocatalyst is prepared from cadmium salt, zinc salt, indium salt and sulfur source compounds by a one-step hydrothermal method. The method comprises the following steps of: adding the cadmium salt and the zinc salt to indium salt aqueous solution, stirring until the solution is transparent, adding the sulfur source compound, and stirring to obtain a mixed solution; and transferring the mixed solution to a reaction kettle, maintaining the temperature at 90-140 DEG C for 6-24 hours, cooling, washing and drying to obtain the indium-based sulfide composite photocatalyst. The photocatalyst has hydrogen yield of 32000-37000 mu mol.h<-1>.g<-1> under irradiation of light with wavelength lambda more than 400 nm, has good cycle performance, and can be used for hydrogen preparation based on photocatalytic hydrolysis.

The invention discloses an S-1 full-silicon molecular sieve and a preparation method thereof as well as application of the S-1 full-silicon molecular sieve in caprolactam preparation. The S-1 full-silicon molecular sieve is prepared by the method comprising the following steps: (1) synthesizing a tetrapropylammonium hydroxide template agent; and (2) synthesizing a molecular sieve: carrying out a reaction on tetrapropylammonium hydroxide liquor and tetraethoxysilane and ethanol, filtering, washing with deionized water, drying reaction liquid, roasting, so as to obtain molecular sieve raw powder; adding silica sol, polyethylene glycol 2000, and stronger ammonia water, sesbania powder and activated carbon powder in the molecular sieve raw powder, kneading in a kneader, then carrying out extrusion; roasting, immersing the roasted product in a NH3-NH3NO3 mixing solution and a hydrofluoric acid solution respectively, washing with deionized water, drying, roasting again so as to obtain the S-1 full-silicon molecular sieve. In the invention, the template agent is cheap; the conversion rate of the cyclohexanone and selectivity of the caprolactam are extremely high; a catalyst can be easilyand fast regenerated; and the use of concentrated sulphuric acid is avoided, thus the S-1 full-silicon molecular sieve and the preparation method thereof are environment-friendly.