**3.3. Final considerations**

In **Figure 10**, the initial 1-heptyne hydrogenation rates (calculated per gram of palladium) and the selectivities to the desired product (1-heptene) at 180 min for all of the synthesized catalysts against Lindlar catalyst results are compared.

**Figure 10.** Comparison of initial 1-heptyne hydrogenation rates (a) and selectivities to 1-heptene at 180 min (b) for the catalytic systems evaluated in the present chapter.

According to the results obtained and shown in **Figure 10**, the tested catalysts showed the following order of activity:

$$\text{Pd-Ni/Al} > \text{PdN}\_{\text{(0.45)}}/\text{Al} > \text{Pd}\_{\text{(0.45)}}/\text{Al} > \text{ Lindllar} > \text{Pd}\_{\text{(9\%)}}/\text{Al} > \text{Pd}\_{\text{(9\%)}}/\text{Al}\_{\text{.37}} > \text{Pd}\_{\text{(9\%)}}/\text{AC}$$

With the following order of selectivities:

Pd(5%)/Al\_373 ≈ Pd-Ni/Al = Pd(0.4%)/Al ≈ PdN(0.4%)/Al = Pd(5%)/AC > Pd(5%)/Al >> Lindlar

From **Figure 10**, it can be concluded that the prepared pelletized catalysts are more active and selective than the Lindlar catalyst.

Finally, pelletized catalysts have additional advantages against the Lindlar catalyst: the easy and cheap way of recovering the catalytic systems from the remaining solution at the end of the industrial process.
