In this paper, based on the background of hydrogen photolysis of water, adapts the computational fluid dynamics software combined with secondary development to numerically analyze the heat transfer process inside the solar photocatalytic reactor. A high⁃quality structured hexahedral photocatalytic reactor grid was established to analyze the temperature distribution characteristics of the solar photocatalytic reactor model numerically, compile the Gaussian heat flow and validate the model combined with the solar photocatalytic water activity evaluation system for hydrogen production. This article will focus on the effect of solar radiation on the temperature distribution of the fluid inside the reactor and the reactor under full spectrum, and study the differences in temperature distribution and causes under different conditions.

The porous SAPO-11 molecular sieves were prepared by dry-gel method under the condition of single or simultaneous addition of cetyltrimethylammonium bromide (CTAB) and polyethylene glycol (PEG), respectively, with pseudoboehmite, silica sol and phosphoric acid as aluminum source, silicon source and phosphorus source, dipropylamine and diisopropylamine as template. The synthesized SAPO-11 molecular sieves were characterized by XRD, nitrogen physical adsorption and desorption, SEM, NH ₃-TPD and Py-IR. The catalytic performance of the prepared Pt/SAPO-11 molecular sieve in n-dodecane isomerization reaction was investigated on a fixed bed. The results show that the addition of CTAB and PEG in the dry gel synthesis of SAPO-11 can promote the formation of mesoporous structure in the molecular sieve and change its morphology and acid strength. The selectivity and yield of the synthesized multistage pore SAPO-11 catalyst for n-dodecane hydroisomerization are significantly superior to those of the microporous SAPO-11 molecular sieve. The selectivity and yield of isoparaffin of Hier-Sapo-11-cp molecular sieve reach 71.2% and 62.1% respectively at 340 ℃.

    Through introducing briefly the definition , characteristic of virtual reality modeling language (VRML)and the design procedure in the course of virtual product design , it proves that visual reality (VR) technology is no t o nly feasible in the virtual product desig n, but also ge ts good results.On the basis of this, throug h a virtual pro duct design instance , how to use VRM L to realize the kinematic simulation of the virtual products w as explained in detail .First of all , solid models throug h the three - dimensional model softw are was set up and ex ported with DXF file .Throug h VRML output interface provided by tool software such as 3DS MAX, WRL file was generated .Then WRL file w as edited in order to realize the kinematic simulation effects of machine parts.Thus, it is helpful to learn the structure of the mechanical par t , solid shape and movement characteristic .