Catalyst Poisoning Solutions

Catalyst poisoning refers to the partial or total deactivation of a catalyst by a chemical compound. Poisoning refers specifically to chemical deactivation, rather than other mechanisms of catalyst degradation such as thermal decomposition or physical damage.

Catalyst poisoning may occur in essentially two different ways, by preventing hydridocarbonyl formation from the suitable metal sources or by damaging the metal centre and/or the ligands.

GBA Catalyst Poisoning
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Identification is better than replacing the catalyst

ApplicationsAnalysis of trace arsine and phosphine in high purity polymer grade ethylene and propylene gas
Measuring ObjectsGaseous sample
Targeted ComponentsAsH₃, PH₃, H₂S and COS
RangePPB to PPM
Reference MethodUOP 1023-18
  • The novel catalysts increase the efficiency and selectivity significantly of polymerization processes
  • Components such as Arsine (AsH₃), Phosphine (PH₃), Sulphur-containing compounds (H₂S and COS) poison the catalyst and deactivate the efficiency of the catalyst and change the property of polymer
  • Identifying these components in trace level (part-per-billion concentration) is always challenging
  • Catalyst poison leads to shut down the manufacturing plant

How to solve the issue?

Identifying the catalyst poison in the feedstock and stop using that feedstock will help to increase the lifetime of catalyst and productivity of the plant. Prevention is always better than cure!

GBA Solution: How about identifying the trace level components in the feedstock?

  • Gas chromatography coupled with mass spectrometry is the versatile tool
  • Inert sample flow pathways and mass spectrometers with high efficiency source (HES) give Low-level parts per billion (ppb) detection limits
  • Excellent system sensitivity and selectivity by selective ion monitoring

Features of the solution:

  • Gas Sampling can be done by precise gas sampling valve
  • MSD is the gold standard for trace level identification
  • Single digit PPB concentration can be analyzed
  • Excellent linearity, %RSD and IDL
  • Permeation tubes for (AsH₃, PH₃) can be used to generate low level concentration of the components as standard

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