Page 9 - Adsorptionbypowders & poroussolids muyace

10.3.5. Physisorption by high-temperature aluminas 3 15
10.3.6. Thermal decomposition of trihydroxides 3 18
10.3.7. Deconiposition of boehmite and hydrous alumina 323
10.4. Titanium dioxide powders and gels 323
10.4.1. Titanium dioxide pigments 323
10.4.2. Rutile: sugace chemistry and gas adsorption 325
10.4.3. The porosity of titania gels 33 1
10.5. Magnesium oxide 333
10.5.1. Physisorption of non-polar gases on non-porous MgO 333
10.5.2. Physisorption by porous forms of MgO 336
10.6. Miscellaneous oxides 340
10.6.1. Chromium oxide gels 340
10.6.2. Ferric oxide: thermal decomposition of FeOOH 344
10.6.3. Microcrystalline zinc oxide 346
10.6.4. Hydrous zirconia gels 347
References 35 1
Chapter 11. Adsorption by Clays, Pillared layer Structures and Zeolites 355
1 1.1. Introduction 355
11.2. Structure and morphology of layer silicates 358
1 1.2.1. Kaolinite 358
11.2.2. Smectites and vermiculites 359
1 1.2.3. Palygorskites 360
1 1.2.4. Morphology of clay particles and aggregates 36 1
1 1.3. Physisorption of gases by kaolinite 361
1 1.3.1. Nitrogen isotherms 36 1
1 1.3.2. Energetics of argon and nitrogen adsorption 363
11.4. Physisorption of gases by smectites and vermiculites 364
1 1.4.1. Adsorption of non-polar molecules 364
1 1.4.2. Sorption of polar molecules 366
11 -4.3. Physisorption by expanded smectites 370
11.5. Formation and properties of pillared clays 373
1 1.5.1. Pillaring 373
1 1 S.2. Chemical and physical nature of pillared clays 375
1 1.6. Physisorption of gases by pillared clays 375
11.7. Structure, morphology and synthesis of zeolites 378
1 1.7.1. Zeolite structures 378
Zeolite A 379
Zeolites X and Y 380
Pentasil zeolites 380
Role of exchangeable cations 380
11.7.2. Zeolite synthesis 381
11.7.3. Zeolite morphology 382
11.8. Adsorbent properties of molecular sieve zeolites 382
1 1.8.1. Physisorption of gases by zeolite A 382