Combined high-pressure photocatalytic reactor--UHV system and sample transfer device

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1139987· OSTI ID:6867714

Moshfegh, A Z; Ignatiev, A

The design and construction of a multistage high pressure photocatalytic reactor and sample transfer device with adaptation to a surface analysis chamber are reviewed in detail. The apparatus consists of four components: (i) a small stainless-steel high-pressure photocatalytic reactor with gas handling section, (ii) a gas product detection chamber with quadrupole mass spectrometer (QMS), (iii) an ultrahigh-vacuum (UHV) surface analysis system, and (iv) a bellows-type sample transfer device incorporated with a worm gear. The reactor, which has a total internal volume of approx. =320 ml, is capable of operation under dynamic (flow) or static (batch) modes. It includes a sapphire view port to enable the study of the influence of UV-visible photoirradiation on low surface area (approx. =1 cm/sup 2/) metal and metal oxide catalysts in various heterogeneous catalytic reactions. The catalyst sample can undergo any chemical process within the pressure range of from approx. =1 x 10/sup -9/ to 2 x 10/sup +3/ Torr and over a temperature range of 80--1100 K. The catalyst can be positioned at three different stages for parking and loading, chemical reaction processes, and surface analysis. The sample transfer device has the ability to translate the catalyst under UHV conditions from the parking and loading stage to the surface analysis chamber (a distance of 620 mm). Before and/or after any chemical process, the surface of the catalyst can be characterized by AES, XPS, UPS, ESDIAD, and TDS techniques in the surface analysis system.

• Research Organization: Department of Physics, University of Houston, Houston, Texas 77204-5504
• OSTI ID: 6867714
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 59:10; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
CATALYSIS
CHEMICAL REACTORS
CHEMISTRY
DESIGN
EFFICIENCY
FLUID FLOW
GAS FLOW
HETEROGENEOUS CATALYSIS
HIGH TEMPERATURE
MASS SPECTROMETERS
MEASURING INSTRUMENTS
OPERATION
PERFORMANCE
PHOTOCHEMISTRY
SPECTROMETERS
ULTRAHIGH VACUUM