Autosorb-1-CMS (англ.)

Autosorb-1-CMS (англ.)
C O M P L E T E G AS S O R P T I O N A N A L Y Z E R W I T H M A S S S P E C T R O M E T E R
A u t o s o r b ®- 1 - C / M S B e n e f i t s
•
Combines gas detection by
spectrometry
with
automatic
mass
A U T O S O R B ®®- 1 - C / M S
gas
sorption analysis to provide a more
complete surface characterization of
porous solids.
•
Provides In-depth catalyst characterization,
including
micropore
size
determination in a single instrument.
•
Achieves detailed identification of
desorbed species under controlled
heating rates and atmospheres.
•
Requires little bench space because of
Integrated design utilizing Autosorb’s
proven vacuum system.
The exposed surface of many powders is often found deep
within individual particles. This fact has a tremendous impact
on applications of powdered solids because, even for a single
solid, not all surfaces are created equal. Real surfaces are heterogeneous and their properties vary from exterior to interior as
well as from one surface patch to another. Such variations can
be more fully quantified by means of a complete gas sorption
analyzer such as the Autosorb®-1-C/MS.
Temperature Programming
During a chemisorption analysis, the total number of active
sites, or the active surface area, is evaluated. If one heats up the
sample, the chemisorbed species tend to desorb according to
how strongly they were bound to the active sites to begin with.
Weaker sites normally release their chemisorbed species at lower
temperatures than stronger sites.
If the sample had two distinct types of active sites, heating
would release gases at two different temperatures. To quantify
these releases, one can increase the sample temperature linearly
and monitor the evolution of gases in a number of ways. If only
a single gas is evolved, one can simply monitor the rise in pres-
sure in a closed, pre-evacuated sample cell as a function of temperature. This could be regarded as a "Soak" Temperature
Programmed Desorption (TPD) experiment.
If more than one species was desorbed, it would be necessary
to identify each one as it is evolved from the sample. This can
be done by attaching a Mass Spectrometer (MS) to the exit valve
of the Autosorb®-1-C and performing the thermal desorption
under a flow of inert or carrier gas. As such, this experiment
would be termed Flow TPD, or Flow TPR if a reactive gas is
used instead of an inert gas. With MS sampling rates in the order
of seconds, this allows the evaluation in detail of fast-releasing
“reactive” sites, or readsorption phenomena.
Moreover, a properly placed MS probe can sample gases from
an evacuated chamber (Vacuum TPD). A clear advantage of
Vacuum TPD is that desorbing species can reach the MS more
quickly and without being affected by diffusion or readsorption
effects through pore networks.
Over...
Quantachrome Instruments • 1900 Corporate Drive • Boynton Beach, FL 33426, USA
TEL +1 (561) 731-4999 • FAX +1 (561) 732-9888
www.quantachrome.com
qc.sales@quantachrome.com
The AUTOSORB-1-C/MS
The Autosorb®-1-C/MS provides physisorption, chemisorption, flow or vacuum TPD and
residual gas analysis (MS) capabilities in a single unit.
1. Temperature programmed furnace: 1oC steps
up to 1000oC with ramp rates up to 50oC per
minute.
2. Quartz flow-through cell for chemisorption
studies.
3. Floating cell guard.
4. Flexible positioning of quadrupole sensor and
eletronics control unit for various models of
residual gas analyzers.
5. Needle valve for mass spectrometer or
optional diversion valve for GC port.
SELECTED
APPLICATIONS
Autosorb®-1-C/MS SPECIFICATIONS
General
Range:
Detectors:
Ion Source:
Maximum Operating Pressure:
Resolution:
Sensitivity:
Min. Detectable Partial Pressure:
1 to 200 amu (400 optional)
Faraday Cup
Electron Multiplier (optional)
Open or Closed
1x10-4 (open ion source)
1x10-2 (closed ion source)
<10% of Valley
(per AVS Standard 2.3)
2x10-4 amps/torr
(open ion source)
Faraday Cup (2x10-11 torr)
Electron Multiplier (5x10-14 torr)
Physisorption Studies
Micropore Analysis
Mesopore Analysis
Fractal Dimensions
Chemisorption Tests
Carbon Reactivity
Catalyst Dispersion
Surface Acidity and
Basicity
TPR/TPD/TPO
Physical
ECU Operating Temperature:
OoC to 40oC
Compliance
CE Mark:
EMC 89/336/EEC
(electromagnetic compatibility)
72/23/EEC
Low Voltage Directive
CORPORATE HEADQUARTERS
Quantachrome Instruments
1900 Corporate Drive
Boynton Beach, FL 33426 U.S.A.
Phone: +1 (561) 731-4999
Fax:
+1 (561) 732-9888
E-mail: qc.sales@quantachrome.com
EUROPE
Quantachrome UK Limited
European Technical Center
Pale Lane Farm, Pale Lane
Hartley Wintney, Hook RG27 8BA, UK
Phone: +44 (0)1252 819719
Fax:
+44 (0)1252 819901
CHINA
Quantachrome Representative Office
Rm. 1701B, Everbright Building
No.6 Fuxing Men Wai Street
Beijing 100045 China
Phone: 010-68561530; 010-68560808-172
Fax: 010-68561530; 010-68029962
EUROPE
Quantachrome GmbH
Rudolf-Diesel Str. 12
85235 Odelzhausen, Germany
Phone: +49 (0)8 134/93240
Fax:
+49 (0)8 134/932425
Our policy of continuous development may cause the information and
specifications contained herein to change without notice or liability.
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the property of their respective owners.
US Patent No. 6,257,835
Other Patents Pending
© 2002-2005 Quantachrome Corporation
0705
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