On the cold hydrogenation of silicon tetrachloride
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I have a question regarding the cold hydrogenation or chlorohydrogenation processes: 1. Why is such high pressure required? Can the reaction take place at lower pressures? Has anyone conducted exploratory research in this area? If, if conversion cannot take place under low-pressure conditions, what is the reason for that? 2. Regardless of the catalyst used, what is the catalytic mechanism? 3. What is the principle behind the cold hydrogenation process? What is the reaction equation? Don’t tell me that overall reaction equation: Loveliness: For thermal hydrogenation, it is believed that at high temperatures, SiCl4 and H2 are able to overcome a certain amount of the activation energy for the reaction, thereby producing SiHCl3 ； Catalyzed cold hydrogenation simply reduces the activation energy of the reaction, allowing various reactions to occur by breaking bonds without the need to raise the molecules’ internal energy to very high levels through high temperatures. So, what is the process involving the catalyst and the reactants (Si powder, H2, STC, or HCl)? Is it based on the usual catalytic principles of adsorption, reaction, and desorption? What then are the activation centers of a catalyst? Please share your thoughts.
1. The reaction is a volume-reducing process, and increasing the pressure facilitates the forward shift of the reaction equilibrium; therefore, within acceptable limits, it’s certainly advisable to raise the pressure as much as possible. Calculations related to reaction equilibrium and kinetics have been conducted previously, and under such pressures, the equilibrium conversion rate is less than 40%, and it’s even lower at low pressures. 2. There are no research findings regarding the catalytic mechanism; in fact, for many gas-solid catalytic reactions, no definitive results exist. If you manage to discover something, you can publish an SCI paper with an impact factor of over 5. 3. I’m not sure what you mean by “principle” – the reaction involves multiple steps. I’ve read relevant literature but can’t recall the details exactly; in any case, the breaking of the Si–Cl bond is the rate-determining step, and this step is very slow
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