Material selection under high temperature and pressure, as well as corrosion by chloride and copper ions

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I am a primary school student interested in chemical equipment, and I am seeking advice from everyone. I am currently designing a reactor with a working temperature of 240°C. The water in the reactor contains 1% NaCl by weight, with Cu ions at levels above 250 ppm; the pH value is between 3 and 4. Pure oxygen is introduced during the reaction, and the pressure is greater than 4 MPa. . At first, I heard that Cu ions cause severe corrosion under these conditions, so I started looking for a suitable Hastelloy alloy. Later, the expert in corrosion prevention said that under such conditions, Cu does not undergo a reduction reaction but rather an oxidation reaction, which actually helps to protect the passivation layer. I’m not sure whether this is correct. If we ignore the corrosion caused by Cu particles, then can 2507 still be used under the influence of Cl ions? Is its corrosion rate high? Could it suffer from pitting, intergranular corrosion, or stress corrosion, which are types of non-uniform corrosion? If 2507 duplex steel is not considered, can TA2 composite plate be used? Or are there any other suitable alternative materials? . Looking forward to your reply. Thank you very much.