The PMI Advanced. BET SORPTOMETER BET-203A Not just products...solutions!

Transcription

1 The PMI Advanced BET SORPTOMETER BET-203A Nt just prducts...slutins!

2 DESCRIPTION PMI s BET-Srptmeter is fully autmated, vlumetric gas srptin analyzer t measure accurately adsrptin and desrptin istherms fr the characterizatin f surface area, pre size distributin, pre vlume and pre structure f micr and mesprus materials as well as the kinetics f adsrptin. APPLICATION PMI s BET Srptmeter has a multitude f applicatins in industries wrldwide. Sme applicable industries include Autmtive Industry Battery/Fuel Cells Industry Ceramic Industry Chemical Industry Filtratin Industry Paper Industry Pharmaceutical/Medical Industry Pwder Metallurgy Industry And many mre PRINCIPLE When clean surface is expsed t a gas, an adsrbed film frms n the surface. Adsrbed films als frm n the surface f pres within a material and vapr can cndense in the pres. At a cnstant temperature, the amunt f adsrbed/cndensed gas n a surface depends n the pressure f the gas. Measurement f the amunt f adsrptin/cndensatin as a functin f pressure can give infrmatin n the pre structure. The PMI Srptmeters use gas adsrptin/cndensatin t analyze pre characteristics. Further, measurement f pressure as a functin f time prvides the kinetics infrmatin f adsrptin.

3 PHYSICAL ADSORPTION Weak van der Waal s type interactin f mlecules with a pre surface leads t physical adsrptin. The Brunauer, Emmett and Teller (BET) thery f physical adsrptin is nrmally used fr analysis f adsrptin data t cmpute surface area. P = 1 C-1 m P m Where: Figure 4 Adsrptin and Desrptin Istherms W = amunt f adsrbed gas Water Vapr at 0 C Wm = amunt f gas adsrbed in a mnlayer P = gas pressure P0= equilibrium (saturatin) vapr pressure at the test temperature C = dimensinless cnstant that depends n the temperature and the gas/slid system When vapr pressure, P is lw cmpared with P0 (0.05 < P/P0 < 0.3), the plt f [P/W (P0 P)] verses [P/P0] is linear and the plt yields the magnitudes f C and Wm. The surface area S per unit mass, m, f the sample is cmputed using the crss-sectinal area f the adsrbed gas mlecule: S= Wm N a m Where: N a = crss sectinal area f the adsrbed gas mlecule Wm = amunt f gas adsrbed in mles Figure 1 Adsrptin and Desrptin Istherms at Liquid N2 temperature

4 VAPOR CONDENSATION As the relative vapr pressure (P/P) increases, vapr eventually cndenses in the pres utilizing the surface free energy available due t replacement f the slid/vapr interface by slid/liquid interface. The amunt f vapr cndensed in pres gives the pre vlume, and the Kelvin equatin gives the pre diameter. In ( P )= - 4 γ V cs θ DRT Where: γ = surface tensin f cndensed liquid D = pre diameter V= mlar vlume f cndensed liquid R = gas cnstant θ = cntact angle T = abslute test temperature Adsrbed layersf mlecules frm n the pre walls befre cndensatin fills the pres. Therefre the actual pre diameters are cmputed by adding tw times the thickness f the adsrbed gas layer t D. A cmplete adsrptin istherm is determined by measuring the amunt f vapr adsrbed as a functin f increasing pressure. A desrptin istherm is determined by measuring the amunt f adsrptin as a functin f decreasing pressure. Based n this technique, characteristics f materials related t adsrptin, desrptin, surface area and pre vlume can be determined. PORE VOLUME & PORE DIAMETER Pre vlume, pre diameter and pre vlume distributin can be determined accurately by the PMI BET Srptmeter. The distributin functin is such that area under the functin in any pre diameter range is the vlume f pre in that range. Figure 2 Pre Vlume Distributin

5 ADSORPTION & DESORPTION ISOTHERM Adsrptin and desrptin f gasses n samples can be accurately measured using ur BET Srptmeter. The user has independent cntrl ver the quantity and spacing f pressures used in bth adsrptin and desrptin testing. Many different kinds f analyses are available t interpret data using the supplied reprt generatin sftware. Figure 3 T - Plt Methd - Micrpre Vlume Analysis SOFTWARE The system is cntrlled thrugh mst up-t-date versin f Micrsft Windws based sftware Calibratin rutines able t be cntrlled by PMI s sftware Includes Features fr creatin f methds fr measuring the adsrptin/desrptin istherms PMI Sftware has built in features fr autmatic start up and shut dwn prcedures, real time display f the sample analysis prgress PMI Sftware includes all the data handling features including user defined reprt generatin, data, figures & ability t exprt t spreadsheets, ffline data prcessing, etc. Figure 5 Sftware Main Screen Figure 6 Reprt Selectin Screen

6 FEATURES In situ utgassing: N need fr extra utgassing statins Autmated Cntrl Display f full adsrptin and desrptin istherms Istherm Analysis includes ver Unlimited Data Pints per statin Autmated Cntrl with Data Cllectin and ability t exprt data t MS Excel r ther Prgrams Measurement/calculatin f dead/free vlume and prvisin fr its manual feed in sftware. Built-in Thermal Cnductivity Detectr Surface Area Measurements (Mespre & Micrpre): Ttal Pre Vlume Average Pre Size αs Plt f-rati plt Freundlich & Temkin istherms Langmuir Surface Area Hrvath-Kawaze Mnte- Carl Methd QSDFT Methd MP Methd Dubinin-Radushkevich Methd Dubinin-Astakhv Methd Decnvlutin by mdel fitting. deber t-plt methd (fr measurement f micr pre vlume in cc/g & micrpre area in m²/g) NLDFT Methd BJH pre size distributin DFT pre size methd BET Surface Area STSA pre size methd DH pre size distributin Micrpresize distributin (by Hrvath-Kawaze methd) Autmatic BET Pint Selectr fr Micrprus Materials Pre Structure Characteristics: Mean Pre Size Pre Size Distributin Ttal Pre Vlume Single Pint Surface Area Multi-Pint Surface Area Adsrptin & Desrptin Istherms

7 SPECIFICATIONS Sample Chambers: 3 (able t perate simultaneusly) Surface Area Range(in m²/g): 0.01 (Nitrgen) Pre Diameter Range: Micrpre t 500 nm Micrpre Vlume Range: Detectable within 4x10 cc/g with N2 Sample Vlume: 10 cc (thers available) Adsrbates: Nitrgen, Helium, CO2 ( nn-crrsive gas) Pressure Transducers: 1000 mmhg Pressure Transducer Pressure Transducer Reslutin: 1 part in 10,000 Pressure Transducer Accuracy: 0.15% reading 10 mmhg Pressure Transducer Pressure Transducer Reslutin: 1 part in 10,000 Pressure Transducer Accuracy: 0.15% reading 0.1mmHg Pressure Transducer Pressure Transducer Reslutin: 1 part in 10,000 Pressure Transducer Accuracy: 0.15% reading Number f Gas Inlet Prts: 2 Includes Valves f apprpriate pressure ratings Exchange f gas cylinder nt required Vacuum Level: Upt 10 Trr N need t share during degassing Reslutin: 1 part n 10,000 Accuracy: 0.15% reading Dead-end & Thrugh-pres Adsrptin Temperature: C ( Nitrgen) Regeneratin System (Pretreatment System): Temperature Range: Ambient t 450 C Temperature Accuracy: ± 1 % Pwer Requirements: 220 VAC, 50/60 Hz (Others Available) Measurement Methfffd: Vlumetric Gas Physisrptin -6-3

8 SALES & SERVICES We at Prus Materials Inc., have dedicated sales team helping thusand s f ur custmers identify the right slutin fr their scientific prblems. We are als prud t ffer custmized instruments fr yur unique needs. Our service and applicatins team is cmmitted t effective supprt with shrt respnse times, we ffer cmprehensive range f slutins frm new and custmized systems, calibratin and maintenance t testing services. Explre mre abut us at Disclaimer: *We are cntinusly imprving ur prducts, Design & Specificatin are subject t change withut prir ntice. Custmize yur machine tday!

9 The mst advanced, accurate, easy t use and reprducible Srptmeters in the wrld. Celebrating 35 years f slutins 20 Dutch Mill Rd, Ithaca, NY 14850, USA Tll Free (US & Canada): TALK-PMI ( ) Phne: Fax: PROUDLY inf@pmiapp.cm MADE IN USA