<p><Success style= "margin-top:16rem;text-align:center;"><B>Surface chemistry <br> Lecture-2</B></Success></p>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Recaptulation</B></primary></p> <hr> <main> <div style='float: left; width:100%;font-size:22px;text-align:left'> <ul> <li> <p>Surface chemistry</p> </li> <li> <p>Surface</p> </li> <li> <p>Catalysis</p> </li> <li> <p>Colloids</p> </li> <li> <p>Decrease size of particles the surface area increases</p> </li> <li> <p>Percentage of surface molecules as particles size decreases</p> </li> </ul> </div> <div style='float: right; width:0%;'> <p><img alt="image" src="/subject-images/iitpal/image/chemistry-class-12-unit-05-chapter-02-surface-chemistry-l-2_6-ozdcldcfypu-52.jpg"></p> </div> </main> <hr> <footer style="font-size:18px;"> <span style="color:blue">Recaptulation</span> $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ Example $\rightarrow$ Types of adsorption </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Adsorption</B></primary></p> <hr> <main> <div style='float: left; width:50%;font-size:22px;text-align:left'> <ul> <li> <p>Absorption</p> </li> <li> <p>S\G interface</p> </li> <li> <p>Denotion of $\frac{x}{m}$</p> </li> <li> <p>$\frac{x}{m}$ = $\frac{Mass \hspace{1mm} of\hspace{1mm} gas \hspace{1mm}adsorbed}{Mass \hspace{1mm}of \hspace{1mm}solid}$</p> </li> </ul> </div> <div style='float: right; width:50%;'> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/9dc08752-7692-453d-d508-8106e0086f00/public" width="50%"> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/f2360e4c-461c-4fcb-6e7b-1f2e796da400/public" width="50%"> <!----> <!----> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ <span style="color:blue">Adsorption</span> $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ Example $\rightarrow$ Types of adsorption </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Freundlich adsorption isotherm</B></primary></p> <hr> <main> <div style='float: left; width:50%;font-size:22px;text-align:left'> <p><strong>Example -</strong> Argon on coconut charcoal at $-78.3^oC$</p> <table> <thead> <tr> <th>P/cm of Hg</th> <th>a=x/m</th> </tr> </thead> <tbody> <tr> <td>0.8</td> <td>1.6</td> </tr> <tr> <td>1.9</td> <td>3.7</td> </tr> <tr> <td>2.4</td> <td>5.0</td> </tr> <tr> <td>5.42</td> <td>9.9</td> </tr> <tr> <td>9.84</td> <td>15.4</td> </tr> <tr> <td>12.9</td> <td>18.6</td> </tr> </tbody> </table> </div> <div style='float: right; width:50%;'> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/77d2ef2b-dd33-40a5-f95e-4b0d0d62c900/public" width="50%"> <!----> <!----> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ <span style="color:blue">Freundlich adsorption isotherm</span> $\rightarrow$ Example $\rightarrow$ Types of adsorption </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Freundlich adsorption isotherm</B></primary></p> <hr> <main> <div style='float: left; width:100%;font-size:22px;text-align:left'> </div> <ul> <li>a=3.688p</li> </ul> <ul> <li> <p>Function $a$=$\frac{x}{m}$=$k \quad p^{1/n}$</p> </li> <li> <p>Function of gas , solid and temprature</p> </li> <li> <p>Solid surface on top of which is a liquid with concentration “C”</p> </li> <li> <p>$\frac{x}{m}= kc^{\frac{1}{n}}$</p> </li> </ul> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ <span style="color:blue">Freundlich adsorption isotherm</span> $\rightarrow$ Example $\rightarrow$ Types of adsorption </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Example</B></primary></p> <hr> <main> <div style='float: left; width:100%;font-size:22px;text-align:left'> <ul> <li><strong>Example -</strong> Adsorption of acetone in water on “blood charcoal” $T=18^oC$</li> </ul> <ul> <li>K and $\frac{1}{n}$ Depends on adsorbate , adsorbent , temperature</li> </ul> </div> <div style='float: left; width:20%;font-size:22px;text-align:left'> <table> <thead> <tr> <th>C</th> <th>$a$=$\frac{x}{m}$</th> </tr> </thead> <tbody> <tr> <td>0.00224</td> <td>0.208</td> </tr> <tr> <td>0.01465</td> <td>0.618</td> </tr> <tr> <td>0.04103</td> <td>1.075</td> </tr> <tr> <td>0.08862</td> <td>1.50</td> </tr> </tbody> </table> </div> <div style='float: right; width:0%;'> <p><img alt="image" src="/subject-images/iitpal/image/chemistry-class-12-unit-05-chapter-02-surface-chemistry-l-2_6-ozdcldcfypu-03.jpg"></p> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ <span style="color:blue">Example</span> $\rightarrow$ Types of adsorption </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Example</B></primary></p> <hr> <main> <div style='float: left; width:50%;font-size:22px;text-align:left'> <ul> <li> <p>log $(\frac{x}{m})$= log a = logk+$(\frac{1}{n})log (\frac{p}{c})$</p> </li> <li> <p>y = C+mx</p> </li> <li> <p>Le chatelier principle</p> </li> </ul> </div> <div style='float: right; width:50%;'> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/a4f8abfb-97a8-45a1-0f1a-b6a5b1b37700/public" width="40%"> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/3801b093-e17d-4f19-bb76-f0dd4c72c200/public" width="40%"> <!----> <!----> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ <span style="color:blue">Example</span> $\rightarrow$ Types of adsorption </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Types of adsorption</B></primary></p> <hr> <main> <div style='float: left; width:50%;font-size:22px;text-align:left'> <ul> <li> <p><strong>Physisorption</strong></p> </li> <li> <p><strong>Chemisorption</strong></p> </li> <li> <p>Diatomic molecule potential energy on a function of distance from the surface</p> </li> <li> <p>$N_2 + 3H_2$ $\rightarrow$ $2NH_3$</p> </li> </ul> </div> <div style='float: right; width:50%;'> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/17377f49-22f6-4db0-0451-59899a200f00/public" width="50%"> <!----> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ Example $\rightarrow$ <span style="color:blue">Types of adsorption</span> </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Types of adsorption</B></primary></p> <hr> <main> <div style='float: left; width:50%;font-size:22px;text-align:left'> <ul> <li> <p><strong>Physisorption</strong></p> </li> <li> <p>Non selective</p> </li> <li> <p>$\Delta$ $H_{ad}$ ~ 10-40 kJ/mol (condensation)</p> </li> <li> <p>Reversible</p> </li> <li> <p>Intermolecular forces</p> </li> <li> <p>Instantaneous</p> </li> <li> <p>No activation energy</p> </li> </ul> </div> <div style='float: right; width:50%;'> <!--<img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/d7df4a40-4cfd-4a7d-2e60-775633490e00/public" width="100%">--> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/f8fe2fc6-30eb-4a1f-f7d0-263696948a00/public" width="100%"> <!----> <!----> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ Example $\rightarrow$ <span style="color:blue">Types of adsorption</span> </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Types of adsorption</B></primary></p> <hr> <main> <div style='float: left; width:100%;font-size:22px;text-align:left'> <ul> <li> <p><strong>Chemisorption</strong></p> <ul> <li> <p>Selective</p> </li> <li> <p>Irreversible</p> </li> <li> <p>$\Delta$ $H_{ad}$ ~ 100-250 kJ/mol</p> </li> <li> <p>Chemical bond</p> </li> <li> <p>Finite time</p> </li> <li> <p>Activated adsorption</p> </li> </ul> </li> </ul> </div> <div style='float: right; width:0%;'> <p><img alt="image" src="/subject-images/iitpal/image/chemistry-class-12-unit-05-chapter-02-surface-chemistry-l-2_6-ozdcldcfypu-04.jpg"></p> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ Example $\rightarrow$ <span style="color:blue">Types of adsorption</span> </footer>

<p><Success style="float:center;text-align:center;font-size:28px;"> <B>Surface chemistry Lecture-2</B></Success></p> <p><primary style="float:center;text-align:center;font-size:24px;"> <B>Types of adsorption</B></primary></p> <hr> <main> <div style='float: left; width:50%;font-size:22px;text-align:left'> <ul> <li> <p>$H_2(s)$ $\rightarrow$ $2H(g)$</p> </li> <li> <p>$\Delta H$ $\uparrow$</p> </li> <li> <p>$H_g(g) \rightarrow$ PE Surface -H(s) $\Delta H$</p> </li> </ul> </div> <div style='float: right; width:50%;'> <img src="https://imagedelivery.net/YfdZ0yYuJi8R0IouXWrMsA/4bd3a898-ffe6-43e5-7601-3ac424bd8000/public" width="50%"> <!----> </div> </main> <hr> <footer style="font-size:18px;"> Recaptulation $\rightarrow$ Adsorption $\rightarrow$ Freundlich adsorption isotherm $\rightarrow$ Example $\rightarrow$ <span style="color:blue">Types of adsorption</span> </footer>

<p><Success style= "margin-top:16rem;text-align:center;"><B>Thank you</B></Success></p>